Page 1 FEBRUARY 2004 0049-2200-001 Rev. A 0049-2200-500 MD1276A Global 56K/V90 Modem User’s Guide...
Page 2: Table Of Contents
Contents Introduction ..........................6 Installation ..........................7 Unpacking Your Hardware ....................7 Additional Items You Need ....................7 Hardware Overview ......................8 Installation Summary ......................9 Connecting the Cables ..................... 10 Driver Installation ....................... 11 Modem LED Display ......................12 Front Panel Mode LEDs ....................
Page 3 ATZn Restore Configuration Profile ................106 AT&B Character Length ....................107 AT&C Controlling Data Carrier Detect ................108 AT&D Controlling Data Terminal Ready ................109 AT&F. Reinitialise Modem ....................110 AT&F Restore Factory Defaults ..................111 AT&G Guard Tone ......................112 AT&H Clock Control ......................
Page 4 AT%U V.42 Response Codes ..................163 AT%W Welcome Message ..................... 164 AT\A MNP Block Size ...................... 165 AT\Bn Generate Break ....................166 AT\J Auto-Reliable Fallback .................... 167 AT\K Break Control ......................168 AT\N Asynchronous Operating Mode ................170 AT\Q Extended Flow Control ..................172 AT\S Display Active Configuration ..................
Page 5 ATS33 EQM Threshold Value ..................224 ATS38 Disconnect Delay ....................225 ATS42 Modem Disconnect Reason ................226 ATS43 Break Sequence Length ..................227 ATS45 V.22bis EQM Threshold Value ................228 ATS57 DTR High Detection ..................... 229 ATS62 V.42 Detection Timer ................... 230 ATS66 Remote Access Guard Time ................
Page 6: Introduction
Introduction Welcome to the MD1276A Modem User Guide, a comprehensive guide to the efficient use of your modem. Together with the Read Me First Guide supplied with your modem, this reference manual provides all the information needed to make maximum use of your equipment and software.
Page 7: Installation
Installation Installation Unpacking Your Hardware Your package should include: • ® The BLACK BOX MD1276A modem • An RJ-11 telephone-line cable • A power supply module • This User’s Guide If your package contents are damaged or missing, please contact your place of purchase immediately.
Page 8: Hardware Overview
Hardware Overview Back View The following figure shows the back view of the modem. Starting from the left side, this view shows: • A line jack for connecting the modem to the communications line. • An audio jack for leased-line operation. •...
Page 9: Installation Summary
Installation Installation Summary The modem installation involves the following steps: 1. Finding a suitable location for the modem. See the section below. 2. Making the necessary modem connections. See page 12. 3. Installing the modem driver. See page 13. Finding a Suitable Location The location you select for your modem should provide easy access to the back panel communications interfaces and provide a clear view of the front panel LED indicators.
Page 10: Connecting The Cables
Connecting the Cables 1. Turn off your computer. 2. Plug the data cable's male end (pins showing) into the connector marked RS232 at the back of your Modem and then plug the female end (no pins showing) of the same cable into the COM port at the back of your computer.
Page 11: Driver Installation
Installation Driver Installation Windows 2000 1. Windows will detect the modem automatically. Please insert the supplied CD and click "Next". 2. Select "Search for a suitable driver for my device [recommended]", and then click "Next". 3. Select "Specify a location" and click "Next". 4.
Page 12: Modem Led Display
Modem LED Display When your modem is using V.90, the Front Panel Mode LEDs will display the speed closest to the K56flex speed. Transmit Data (TXD) LED will flash when the modem is sending data. Receive Data (RXD) LED will flash when the modem is transferring data from the remote to the local computer. Off-Hook LED will glow when the modem is on-line;...
Page 13: Front Panel Mode Leds
Installation Front Panel Mode LEDs Line Modulation Three Four K56flex 56000 bps K56flex 54000 bps K56flex 52000 bps K56flex 50000 bps K56flex 48000 bps K56flex 46000 bps K56flex 44000 bps K56flex 42000 bps K56flex 40000 bps K56flex 38000 bps K56flex 36000 bps K56flex 34000 bps K56flex 32000 bps K56flex 30000 bps...
Page 14: The At Commands
The AT Commands The AT commands are a group of special commands recognised by your modem. These commands derive their name from the letters AT, which are used to prefix commands. Before continuing: • Run your communications software and enter local mode (or terminal mode) at 38,400 bps Refer to your communication software manual for details.
Page 15 AT Commands • Type: AT&T1 <E> The modem will enter on-line state (this command actually causes the modem to enter test mode, but is equivalent to entering on-line state). Now try to view the modem’s firmware identity code: • Type: ATI9 <E> Your command will be ignored.
Page 16: Response Codes
Response Codes Your modem is capable of telling you, with on screen messages, what it is doing. These messages are known response codes or result codes, and you will see them from time to time. For example: After a command is successfully executed, the response is: OK After a connection is established, the response is: CONNECT A complete list of Response Codes can be found in Appendix A.
Page 17: Dial Modifiers
AT Commands Dial Modifiers Dial modifiers are characters than can be included in a phone number to make the modem perform special tasks while dialling. For example, not all modem users will be using a dedicated telephone line. Some users will have their modems connected to PABXs. To allow users of PABXs to operate their modems successfully, dial modifiers are supported on the modem.
Page 18: Answering Calls
Hanging Up The H command is used to hang up the modem. After you have finished communicating with another computer you must hang up your modem. Similarly, you must hang up the phone after calling another person. If you don’t, no one will be able to call you and you may even be charged for the length of time the phone was off the hook.
Page 19 AT Commands Your modem is pre-configured to automatically answer any incoming call, provided it is switched on, is in local command state, DTR is high and is not performing a test. If you receive a call on the phone line the modem is connected to, it will answer the call and attempt to connect to the calling modem.
Page 20: Selecting Speeds
Selecting Speeds The following section describes how to select line and terminal speeds for your modem. Terminal Speeds Your modem has the ability to communicate with your computer at various speeds. The modem offers two speed modes: variable speed mode and constant speed mode. Constant speed mode forces your modem to maintain the terminal speed that was selected when you dialed another modem, even if the connection speed made with the other modem does not match the terminal speed of your modem and computer.
Page 21 AT Commands Setting Terminal Speeds Your modem can sense the terminal speed of the computer and automatically change its terminal speed to match. This is known as ‘auto bauding’, and is done each time an AT command is issued to the modem. Your modem can auto baud at 300 bps through 9600 bps, 14,400 bps, 19,200 bps, 38,400 bps, 57,600 bps and 115,200 bps.
Page 22 Example 2 - Dialling other modems at 19,200 bps (V.34 or V.FC) B Command Setting: Terminal Speed: 57,600 bps Flow Control: On (&K3 for RTS/CTS flow control) You may use this arrangement when dialling online information services or bulletin boards. With these settings, you modem will attempt to connect at 19,200 bps, but may change the line speed if the quality of the telephone line does not support this speed.
Page 23 AT Commands Example 3 - Answering incoming calls B Command Setting: Terminal Speed: 38,400 bps Flow Control: On (&K3 for RTS/CTS flow control) If you wish your modem to answer incoming calls, use these settings. This will allow your modem to connect at any speed between 14,400 bps and 300 bps. If you are using a software program that controls the answering of your modem (as some bulletin board systems do) you may need to issue an ATS0=0 command to disable auto-answering, otherwise issue ATS0=2 to make the modem answer calls after two rings (the default setting).
Page 24: Flow Control
Flow Control Your modem supports RTS/CTS, XON/XOFF and Transparent XON/OFF flow control. Flow control ensures that data is not lost between your computer and your modem. Flow control will be ignored when your modem is configured for variable speed mode (AT\N1) or is in local command state.
Page 25 AT Commands Transparent XON/XOFF flow control is selected by issuing the &K5 command. Failsafe Flow Control Failsafe flow control is designed specifically for UNIX computers running the UUCP file transfer protocol. This form of flow control only affects data being transmitted from the computer to the modem.
Page 26: Configuring The Modem
Configuring the Modem Your modem allows you to tailor its operating parameters to suit your own particular requirements. The modem uses S Registers to alter the configuration profile. Each S Register contains a decimal value to represent a time delay, an ASCII character or the number of times the phone should ring before the modem answers it (the interpretation of each value differs with each S Register).
Page 27: Error Correction
AT Commands Error Correction Error Correction Protocols This section examines the error correction and data compression features of your modem. The modem offers both V.42 (LAP-M) and MNP® (Microcom Networking Protocol™) error correction protocols. These protocols allow data errors to be detected by the receiving modem, provide flow control between remote systems and improve the overall throughput of data transfers.
Page 28: Data Compression
Data Compression Two forms of data compression are supported by your modem; V.42bis and MNP 5. V.42bis is based on the Lempel-Ziv compression technique (similar to the techniques used by PC compression programs) and can work with both V.42 and MNP. V.42bis is very good at compressing data that has repetitions of sequences of characters.
Page 29 AT Commands variable speed mode. \N3 selects V.42/MNP auto-reliable mode and \N5 selects V.42-only autoreliable mode. Your modem supports special CONNECT messages for connections made with either reliable or auto-reliable modes. When the AT\V1 command is issued and your modem connects in either reliable or auto-reliable mode, a response message will be sent to your computer.
Page 30 when operating with poor line quality. If the telephone line drops out, MNP 10 will attempt to reconnect up to the maximum time permitted by your country’s telecommunications rules. Thus, if there is a short line drop-out, MNP 10 will provide minimal interruption whereas other modems will disconnect entirely. MNP is the only type of error correction allowed with MNP 10 and is only available when connected to another modem that supports MNP 10.
Page 31 AT Commands Increasing Data Throughput with Error Correction & Data Compression Data throughput refers to the amount of data being transferred. Error correction and data compression allow you to increase data throughput in comparison to if error correction and data compression were not selected.
Page 32: Security & Encryption
Security & Encryption Your modem has many sophisticated security features. Your modem limits caller access by means of user names and passwords. User names and passwords are stored in the modem’s non- volatile memory. With each user name and password a modem command of up to 30 characters may be specified.
Page 33 AT Commands Adding and Changing Users Your modem allows you to add new users and change existing users. Selecting option 2 on the Security Menu will result in a prompt: Enter Name: To add a new user: • Type in the name of the new user <E> User names must not be longer than 30 characters.
Page 34 If you do not enter a command you will be given the option of entering a SuperSecure DES Key for the user. To use this feature refer to the ‘SuperSecure Advanced Security Mode’ or else press ENTER to go on to the next user. Removing Users Your modem allows you to remove individual users or all the users currently stored in your modem.
Page 35 AT Commands attempt was made to connect with that user name. You should regularly check the number of successful and unsuccessful attempts to connect to your modem. • Select option 4 to view the access record <E> An unusually high number of unsuccessful attempts to connect with a particular user name may indicate someone is trying to violate your modem’s security.
Page 36: Callback Security
Callback Security As mentioned earlier, your modem allows you to specify a modem command with every user name and password. This feature allows you to implement modem callback. Callback means that after a caller has successfully connected, your modem will hang up and then dial the caller. Even if an unauthorised caller successfully connects to your modem, that caller will have to be using the phone line which your modem is going to call back.
Page 37 AT Commands Your modem will issue an OK message. You will be returned to local command state. Downloading the Security File Selecting option ‘D’ from the security menu will enable a dump of the security database to your computer for storage or editing. You will be asked to type ‘Y’ to start the download. The file format is: “<user name>”, “<password>”, “<command>”, nnn, mmm CR LF where nnn and mmm are the 3 digit Granted and Denied Access Counts and CR and LF are Carriage Return and Line Feed.
Page 38 and always keep a copy of the unmodified download file. Integrating Caller ID into the Security Database • Enter the Security Menu by typing AT#S. You will then be presented with a request for a Password. If you have not specified a password then key ENTER, else type in the password.
Page 39: Encryption
AT Commands Encryption Your modem supports Data Encryption Standard (DES) encryption. DES encryption allows you to encrypt data being passed to a remote modem. The remote modem must support Cipher Feedback (or CFB) DES encryption in order to decrypt the data sent from your modem. The #E1 command is used to enable DES encryption.
Page 40 For countries other than Australia, DES encryption is only available to end users who meet the security requirements of the Australian Department of Defence. Contact your modem supplier for details of making application for a DES equipped modem to be supplied to you. DES Multikey DES Multikey allows the answering modem to establish which primary keys the originating modem is using and then automatically switch to that key.
Page 41 AT Commands Entering a Key for Each User • Enter AT#E2 to enable SuperSecure mode • Select the security menu using AT#S • Enter the security password to gain access to the security menu • Set up the modem’s primary DES KEY and Initial Value (IV) as per standard DES setup •...
Page 42 Accessing a System Using SuperSecure If both your modem and the remote modem have been correctly setup you can: q Dial the remote system. q The modems will connect and enter security dialog mode using the modem’s primary key. q This key must be the same for both modems. •...
Page 43 AT Commands • ‘Fudge’ is Mark Stein’s password on the remote system • ‘Vanilla’ is the password on the local modem • ‘Access granted’ confirms that the passwords are correct • Secondary keys mismatch if the secondary KEY, IV or KE are different Enabling Rotating Secondary Keys q If you enter a KE of 00 for the user, then the secondary key will remain the same for each connection.
Page 44 Entering a Password in the Remote Modem’s Database When connected in SuperSecure, you may change your password. • Enter **** with a 1 second guard time on either side of the stars • Enter your current password • Enter your new password •...
Page 45 AT Commands q The record format is: aaa, “<username>”, “<encrypted password>”, “<command>”, “bbb,ccc,ddd,eee,fff,ggg”, “<encrypted key>”, “<encrypted> IV”, “<encrypted KE>”CR,LF • aaa is 3 digit control number • bbb is 3 digit access granted count • ccc is 3 digit access denied count •...
Page 46 Dial Stored Phone Numbers Only Option Option ‘M’ is similar to Option ‘K’ but restricts the modem to dialling only those numbers listed in the stored phone number fields as set with the &Z command. The stored numbers must then be dialed using the ATDS=X command where X is the position of the stored number as set with the AT&Z command.
Page 47: Synchronous Modes
AT Commands Synchronous Modes This section explains the use of your modem in synchronous modes. A dumb mode or manual mode allows some of the functions of your modem to be accessed via the front panel switches. Some of the information in this section assumes you have read the Getting Started Section. Your modem offers two synchronous modes, conforming to the Hayes modem synchronous modes 1 and 2.
Page 48: Synchronous Mode
Synchronous Mode 1 Your modem is capable of dialling remote systems in asynchronous mode and then automatically switching to synchronous mode once connection has been made. If the connection is lost, your modem will hang up and return to asynchronous local command state. The computer required to support synchronous communication with your modem must be capable of switching between synchronous and asynchronous modes with the same RS-232 port, as well as controlling the state of the DTR signal under software supervision.
Page 49 AT Commands Data should only be transmitted once DCD, DTR and CTS have been asserted. Your computer should not assume that if CTS is asserted then it is safe to begin transmitting data — your modem will keep CTS asserted whenever it is in local command state.
Page 50 Dialling Dialling will commence as soon as the DTR signal is asserted (an OFF-ON transition occurs). Your modem will not generate response codes when synchronous mode 2 is selected. All call progress is indicated by your modem’s speaker (the M command controls the operation of your modem’s speaker).
Page 51: Leased Line Operations
AT Commands Leased Line Operations A leased line, or private line, is a telephone line that permanently connects two or more locations. The leased line does not have any switching equipment associated with it. Leased-line operation with the modem is selected with the &L command. The &L command informs your modem that communications will occur over leased lines, with no answer tones being generated by the modem.
Page 52 Your modem will hang up and return to local command state if your computer transmits characters while the modem is attempting to establish or re-establish a connection (unless &N0 has been issued). Auto Leased Line Operation (&L2 or &L3) You can select Auto leased line operation with the &L2 or &L3 command. In Auto leased line operation you do not need to issue the ATA command to answer a call, or the ATD command to initiate a call.
Page 53 AT Commands 4 Wire Leased Line setup via audio port Your modem has been supplied with an audio port which enables you to setup 4 Wire Leased Line: 1. Connect Leased Line cable (Pins 1 and 4 for TX / 2 and 3 for RX) to the Audio ports on your modem.
Page 54: Dumb Mode Operation
Dumb Mode Operation Your modem has two methods of operating with your computer. The commonly used method is “smart mode”, where the computer issues “AT” commands to the modem to make it dial and hang up For computers which do not offer an asynchronous port or cannot communicate synchronously using V.25bis commands, dumb mode permits manual control of your modem.
Page 55 AT Commands Refer to the mode table at the beginning of the User Guide - it shows the meaning of each combination of the Mode LEDs. To change the speed at which your modem connects after answering an incoming call: •...
Page 56 • Place front panel Option switch 4 in the Down position (select Dumb mode) • Place front panel Option switch 6 in the Down position (select Originate mode) • Place front panel Option switch 3 in the Down position (disable autoanswering) Your modem cannot dial if auto-answer is enabled.
Page 57 AT Commands • Type: AT&W <E> The modem set up is saved. • Place front panel Option switch 4 in the Down position (select Dumb mode) • Place front panel Option switch 6 in the Down position (select Originate mode) •...
Page 58: Automatic Answering
The connection speed of the modem is indicated by the Mode LEDs. Refer to the Modem LED Display table; it shows the meaning of each combination of Mode LEDs. • Press the Talk/Data button to Data (this button is located next to the front panel Option switches) •...
Page 59: Manual Answering
AT Commands Manual Answering For reasons of data security, it may be desirable to verbally identify a caller before allowing connection to your computer. A telephone handset must be connected to the same telephone line as your modem to permit manual answering. •...
Page 60: The Option Switches
The Option Switches The Option switches allow you to control the operation of your modem in Dumb mode, as well as providing additional features in Smart mode. For users of modems with front panel Option switches only • Front panel Option switches 1 and 2 always take precedence over software setting of behaviour of DTR and DSR.
Page 61: V.25Bis Operations
AT Commands V.25bis Operations V.25bis is a modem command set like the AT command set, which allows you to control your modem. However, V.25bis commands may be issued to the modem in asynchronous or synchronous mode (AT commands may only be issued when the modem is operating in asynchronous mode).
Page 62 Overridden Settings Almost all AT commands and S Registers stored before entering V.25bis mode will have effect except for the following commands. AT Command V.25bis Operation &D Will act as if &D2 is selected Will act as if S0=1 These override settings are not stored in your modem’s non-volatile memory; they are active only while V.25bis command mode is active.
Page 63 AT Commands V.25bis Indications V.25bis indications are similar to the response codes, sent when your modem is operating in AT command mode. Six V.25bis indications are supported by your modem: Verbal Meaning Command accepted and executed Connection established Incoming call detected CFI AB Call failure, abort CFI ET...
Page 64 Most PABXs require you to dial 0 or 9 (in order to obtain an outside line) and wait for a dial tone before dialling the actual phone number. Using dial modifiers, you can successfully dial the phone number 12345 through a PABX using the command: •...
Page 65 AT Commands Direct Dialling Direct dialling refers to your modem’s ability to dial a stored phone number when the DTR signal of your computer is raised. This form of dialling is particularly suited to synchronous computers and is referred in other parts of this guide as ‘DTR Dialling’. The &M command (used to select various methods of DTR dialling in AT command mode) has no effect when the mode is operating in V.25bis command mode.
Page 66 If you issue the DIC command but then want to answer the call, issue the CIC command. The CIC command will cause your modem to answer a call after theDIC command has been issued. The modem will then go on line, transmit an answer tone, and attempt to connect to the calling modem using the communications standard selected by the B command.
Page 67 AT Commands Modem Cable In order to operate correctly, your modem cable must support the following signals: DB25 Pin Signal Transmit Data (TxD) Receive Data (RxD) Request to Send (RTS) Clear to Send (CTS) Data Set Ready (DSR) Signal Ground Data Carrier Detect (DCD) Transmit Clock (TxC)†...
Page 68 HDLC Notes Commands must be correctly framed to be accepted by the modem. The address field must be FF, the control field must be 03 (hex) or 13 (hex) or a bad FCS field or an abort is received. If a succession of V.25bis indications are to be sent to your computer, the poll bit (or final bit) will be set to zero for all but the last V.25bis indication, to signify that more V.25bis indications follow.
Page 69: Distinctive Ring
AT Commands Distinctive Ring The modem is able to discriminate between three different types of rings. This is useful if you purchase the Telstra Duet service. With Telstra Duet, two phone numbers are shared for one telephone line. One is for voice and the second is for your modem. To enable the modem to answer only when your modem number is dialed, issue the command: AT-SDR=4 S0=2 (This can be saved with AT&W).
Page 70: Caller Id
Caller ID The modem has enhanced Caller ID functions integrated with its security system. The user can set up the modem to display the number of all inbound calls and selectively answer or not answer the call depending on whether the caller is known. The modem can also be programmed to play a unique ‘tune’...
Page 71 AT Commands REASON NO NAME = <message> where message is ‘Out Of Area’ or ‘Private’ is displayed if the network does not provide a name QUAL = Long Distance is displayed if the call is long distance where message can be ‘Call Forward’ or ‘Call Forward: REDIRECT = <message>...
Page 72 You will then be prompted for another name. When you are finished entering names. Key ENTER to return to the Security Menu. You may display the users in the database by selecting the ‘1’ command. Caller ID entries are distinguished from DIAL BACK security entries by the lack of valid AT commands in the Command field.
Page 73: Call Logging
AT Commands Call Logging The modem includes a Call Logging Function that automatically records the Date, Time, Phone Number and Name of any inbound call that has Caller ID information. In addition the modem will also log all outbound calls that are originated by the modem and record the phone number, connect speed, disconnect reason and call duration.
Page 74: Commands
Commands +++ Escape Sequence When the modem is in on-line-state, issuing an escape sequence will force it to return it to on- line command state, without disconnecting. Unlike other commands, you should not type AT before the escape sequence, nor type a carriage return after it.
Page 75: Remote Access Sequence
AT Commands **** Remote Access Sequence When the modem is connected to a remote modem and is in on-line state, the remote modem may type this command to force the modem to enter Remote Access mode. Remote Access mode simply means the remote modem will be able to issue AT commands to your modem, just as if you were typing them at your computer keyboard.
Page 76 Options **** Request remote access See Also #A command Universal Remote Access S Register 66 Remote Access Guard Time S Register 67 Remote Access Character Page 76...
Page 77: At? Interactive Command Help
AT Commands AT? Interactive Command Help Your modem will display information about the AT commands it supports if you type a question mark (?) in your AT command. You can view the modem help as ‘pages’ of information. This allows you to read the information at your own pace. Press the Spacebar to view the next help page, Backspace or Delete to view the previous page, or ENTER to quit from the help pages.
Page 78: A/ Repeat Last Command
A/ Repeat Last Command This command orders the modem to re-execute the last command you entered. Unlike other commands, the Repeat Last Command should not be preceded by an AT, nor followed by a carriage return. This command must be typed on one line by itself. Options Repeat last command Page 78...
Page 79: Ata Answer
AT Commands ATA Answer This command enables you to answer an incoming call manually. On receiving an incoming call, the modem will send a RING message code to your computer. When you see the ring message: • Type: ATA <E> Your modem will send an answer tone to the calling (originating) modem and wait to receive a carrier signal in return.
Page 80: Atbn Select Communications Standard
ATBn Select Communications Standard Your modem is capable of connecting to remote systems using a variety of communications standards. This command enables you to select the communications standards you want to use. The performance of V.90 and K56flex are very similar. The main difference is the connect speeds available for K56flex and V.90.
Page 81 AT Commands V.34 at 9600bps V.34 at 12,000bps V.90 at 28,000bps V.90 at 29,333bps V.90 at 30,667bps V.90 at 32,000bps V.90 at 33,333bps V.90 at 34,667bps V.90 at 36,000bps V.90 at 37,333bps V.90 at 38,667bps V.90 at 40,000bps V.90 at 41,333bps V.90 at 42,667bps V.90 at 44,000bps V.90 at 43,333bps...
Page 82 V.32 at 7200bps V.32 (Non-TCM) at 9600bps V.32 at 9600bps V.32bis at 12000bps V.32bis at 14400bps V.34 at 14,400bps V.34 at 16,800 bps V.34 at 19,200 bps V.34 at 21,600 bps V.34 at 24,000 bps V.34 at 26,400 bps V.34 at 28,800 bps 31,200 bps 33,600 bps (Reserved)
Page 83 AT Commands See Also A Command Answer B Command Select Communication Standard D Command Dial +MS Command Page 83...
Page 84: Atd Dial
ATD Dial This command allows you to dial a telephone number. The basic dialling command is: ATD followed by the telephone number. For example: To dial the number (09) 111-1234 • Type: ATD091111234 <E> You can use hyphens, spaces or parentheses. They will be ignored by the modem, but they will make it easier to read the command line.
Page 85: Dial Modifiers
AT Commands Dial Modifiers Dial modifiers enable you to change the characteristics of dialling. (Definitions for all modifiers appear on the following pages.) Modifier Meaning pause return to local command state reverse mode wait for quiet answer initiate MNP 10 at 1200 bps initiate MNP 10 at 4800 bps MNP 10 cellular option last number redial...
Page 86 ; return to local command state This modifier orders the modem to return to local command state — without disconnecting — after it has dialed the number. You may use this modifier to communicate with a mainframe computer using security callback. Your modem dials the number of the mainframe computer and then immediately returns to local command state.
Page 87 AT Commands For example: To tone dial a remote database on 999-1234, wait for a five-second silence and then tone dial an ID code of 1234: • Type: ATDT9991234@1234 <E> J initiate MNP 10 at 1200 bps This modifier allows you to select MNP 10 and make the initial connection at 1200 bps (V.22). MNP 10 is able to automatically adjust the line speed to suit the quality of the phone line.
Page 88 ! hook flash The ! dial modifier issues a hook flash signal — the modem hangs up for a short period. Hook flashes are commonly used with PABXs to transfer calls. For example: To dial 0, hook flash and then dial 12345: •...
Page 89 AT Commands If the modem received any characters from the computer while it is waiting for a dial tone, it will hang up, return to local command state and send a NO CARRIER message. For example: To wait for a dial tone and then dial 111-0123: •...
Page 90: Ate Echo
ATE Echo The E commands enables you to select whether the characters you type at your keyboard (while in the local command state) will be echoed back to the screen by the modem. Options ATE0 Disable local command state echo ATE1 n Enable local command state echo Range...
Page 91: Ath Hang Up
AT Commands ATH Hang Up The H command forces the modem to hang up. The H0 command (Hang up) is used to terminate a call. The H1 command (Go off- hook) can be used to make your modem appear as busy to a remote modem trying to dial in.
Page 92: Ati Identity
ATI Identity Your modem contains a product identity code, also known as the firmware identity code.You can use the I command to display these codes. Options ATI0 Display numeric identity code Return a checksum of modem’s firmware ATI1 ATI3 Display model identifier ATI4 Display code revision and creation date ATI5...
Page 93: Atl Speaker Volume Control
AT Commands ATL Speaker Volume Control Your modem has a volume control which allows you to adjust the volume of its internal speaker. Your modem is preset for comfortable listening levels in a normal office environment, so most users will not need to change the preset volume of their modem. There are four speaker volume levels: Lowest volume level Low volume level...
Page 94: Atm Monitor
ATM Monitor Your modem has a built-in speaker enabling you to monitor the progress of calls. You can listen for dial tones, busy signals, a successful connection to another modem, or someone answering your call. The M command controls the operation of the speaker. Some modems also provide volume control via the L command.
Page 95: Ato Return To On-Line State
AT Commands ATO Return to On-line State The O command enables you to return to on-line state from command state. When you are on- line (connected to a remote computer), anything you type is treated as data by your modem. If you want to send commands to your modem, you must return to local command state by typing the escape sequence (+++).
Page 96 ATO27 Change line speed to 14,400 bps (V.32bis/V.34) ATO28 Change line speed to 16,800 bps (V.32bis/V.34) ATO29 Change line speed to 19,200 bps (V.32bis/V.34) ATO30 Change line speed to 21,600 bps (V.32bis/V.34) ATO31 Change line speed to 24,000 bps (V.32bis/V.34) ATO32 Change line speed to 26,400 bps (V.32bis/V.34) ATO33...
Page 97: Atq Quiet (Suppress Response Codes)
AT Commands ATQ Quiet (Suppress Response Codes) Your modem has a variety of messages or response codes which it sends in response to various commands. Examples of these codes are the OK and CONNECT messages. The Q command allows you to switch these messages on and off. If you switch the messages off, no response codes will be displayed on your screen —...
Page 98: Atr Set Terminal Speed
ATR Set Terminal Speed The R command allows you to switch off “autobauding” and specify the terminal speed at which your modem operates. Normally your modem uses autobauding, meaning that when you issue commands to your modem, it automatically detects the speed at which you issue the commands and changes its terminal speed to match your computers terminal speed.
Page 99 AT Commands ATR26 26,400 bps (locked terminal speed - no autobaud) ATR28 28,800 bps (locked terminal speed - no autobaud) ATR38 38,400 bps (locked terminal speed - no autobaud) ATR57 57,600 bps (locked terminal speed - no autobaud) ATR76 76,800 bps (locked terminal speed - no autobaud) ATR96 96,000 bps (locked terminal speed - no autobaud) ATR115...
Page 100: Atsn? Display S Register Value
ATSn? Display S Register Value The Sn? command allows you to read the value in a particular Special Register (S Register). The command is in the form: ATSn? where n is the number of the S Register you want to read. For example: The number of times the modem will allow the phone to ring before answering an incoming call is determined by the value in S Register 0.
Page 101: Atsn= Set S Register Value
AT Commands ATSn= Set S Register Value The Sn= commands enables you to change the value in a Special Register (S Register). The format for the command is: ATSn=x where n is the number of the S Register whose value you wish to change and x is the value you wish to place in the register.
Page 102: Atv Verbal Response Codes
ATV Verbal Response Codes Your modem can display either verbal or numeric response codes in response to various commands. The V command enables you to select which type of response code you want to display. Basic response codes common to all modems are: Verbal Numeric Meaning...
Page 103: Atw Connection Speed Information
AT Commands ATW Connection Speed Information The W command allows you to decide whether your modem will report its line speed or terminal speed when it connects to another modem. Options ATW0 The CONNECT message reports the terminal speed ATW1 The CONNECT message reports the terminal speed ATW2 n The CONNECT message reports the line speed...
Page 104: Atx Extended Response Codes
ATX Extended Response Codes The X command enables you to choose which response codes will be displayed. The basic response codes for all modems are: Verbal Numeric Meaning Command accepted and executed CONNECT Carrier detected and connection established RING Ringing signal detected NO CARRIER Carrier lost or not detected ERROR...
Page 105 AT Commands See Also Q command Quiet (Suppress Response Codes) V command Verbal Response Codes W command Connection Speed Information \V command Error Correction Response Codes %U command V.42 Response Codes S Register 95 Extended Response Codes Page 105...
Page 106: Atzn Restore Configuration Profile
ATZn Restore Configuration Profile Your modem is supplied with a default operating set up. You can change this temporarily by issuing commands while you are working, or permanently by using the &Wn command to store profiles you’ve made in non-volatile memory (where n=profile 0,1,2 or 3). The Zn command returns the modem to saved configuration profile n.
Page 107: At&B Character Length
AT Commands AT&B Character Length The &B command allows the modem to use character lengths of 8, 9, 10 or 11 bits. The modem will only match the speed of your computer when 10-bit or 11-bit characters are selected. Range Options AT&B0 8 bit characters...
Page 108: At&C Controlling Data Carrier Detect
AT&C Controlling Data Carrier Detect The &C command enables you to control how DCD will operate. DCD is a RS-232 interface signal from the modem to a remote device, such as a terminal or a computer, indicating that the modem is receiving a carrier signal from a remote modem. This signal is switched on (asserted) when your modem is receiving a valid carrier signal from a remote modem.
Page 109: At&D Controlling Data Terminal Ready
AT Commands AT&D Controlling Data Terminal Ready The DTR signal is used to indicate to the modem whether your computer is ready to communicate. The &D command will only take effect when the DTR option switch is in the UP position and %S0 is selected.
Page 110: At&F. Reinitialise Modem
AT&F. Reinitialise Modem The &F. command will completely re-initialise your modem. This command will delete stored phone numbers, security, and encryption settings. We recommend you execute this command immediately after installing your modem. All of the stored profiles in non-volatile memory will be restored to factory defaults. •...
Page 111: At&F Restore Factory Defaults
AT Commands AT&F Restore Factory Defaults Your modem comes with factory default settings for all communications settings and S Registers. The &F command enables you to restore the factory default values to the command settings and S Registers. This command does not reset stored phone numbers, security, or encryption settings.
Page 112: At&G Guard Tone
AT&G Guard Tone The &G command controls the generation of guard tones. A guard tone is a predetermined frequency generated by the modem to supervise the communications path. The &G command only affects V.22 and V.22bis connections. Options AT&G0 n Do not generate guard tones AT&G1 Generate guard tones of 550Hz...
Page 113: At&H Clock Control
AT Commands AT&H Clock Control The &H command determines when clocks will be applied to the ‘RxC’ RS- 232 signal. With &H0 selected, the RxC signal will be active whenever a synchronous mode is selected. With &H1 selected, the clock will only be present after a connection has been established to another modem.
Page 114: At&K Flow Control
AT&K Flow Control The &K command enables you to select the type of flow control used between your modem and the local computer when asynchronous mode is selected.You may want to do this to prevent possible data loss resulting from buffer overflow. Using flow control guarantees that data buffers in your modem and computer won’t overflow.Your modem and your terminal or computer must be using the same type of flow control.
Page 115 AT Commands the modem to the computer. Range 0, 3-5, 9 See Also \N command Operating Mode \Q command Extended Flow Control S Register 80 Flow Control High Water Mark S Register 81 Flow Control Low Water Mark S Register 82 Failsafe Flow Control Overrun Page 115...
Page 116: At&L Leased Line
AT&L Leased Line The &L command allows you to specify whether your modem will be connecting over the public switched telephone network (PSTN) or leased lines (point-to-point connection). When the leased-line mode is selected, if the carrier from the remote modem is lost, the modem will continuously attempt to re-establish a connection.
Page 117: At&M Synchronous/Asynchronous Mode
AT Commands AT&M Synchronous/Asynchronous Mode The &M command enables you to select either asynchronous or synchronous operation. During asynchronous transmissions, the time between characters being sent may vary, and the characters are delimited by start and stop bits to co-ordinate data transfer. During synchronous transmissions, the interval between the transmission of each character is of equal length, controlled by clock signals.
Page 118 Range 0-2, 4 See Also &D command Controlling DTR &X command Synchronous Clocks &Z command Stored Phone Number Page 118...
Page 119: At&N Abort Connection
AT Commands AT&N Abort Connection The &N command determines whether the modem will abort the attempt to make a connection if sent a character by the computer. You can abort connection by either lowering the DTR (Data Terminal Ready) signal, or by sending a character (except a null or line feed character) to the modem.
Page 120: At&R Rts/Cts Control
AT&R RTS/CTS Control The &R command allows you to determine the relationship between the RTS (Request to Send) and CTS (Clear to Send) signals, when operating in synchronous mode. The &R command is ignored whenever asynchronous mode is selected. %R1 overrides the &R command. Options AT&R0 n CTS follows RTS when the modem is on line.
Page 121: At&S Controlling Dsr
AT Commands AT&S Controlling DSR The &S command allows the modem to control the state of the DSR (Data Set Ready) signal. This command will only take effect when the DSR option switch is in the UP position (see your Dumb Mode Section for details).
Page 122: At&Vn View Active Configuration Profile
AT&Vn View Active Configuration Profile The &V command allows you to view the active configuration profile of your modem. This shows the settings of AT commands and S Registers. Not all AT commands and S Registers will be shown. For example, the commands which relate to V.25bis operation will only appear when V.25bis mode is selected.
Page 123: At&Wn Write Configuration Parameters
AT Commands AT&Wn Write Configuration Parameters The &Wn command allows you to save the current configuration profile including communications settings and S Register values into 1 of 4 stored profiles in the modem’s non- volatile memory. The values contained in the modem’s non-volatile memory specified by the &Y command will be loaded when the modem is next switched on.
Page 124: At&X Transmit Clock
AT&X Transmit Clock The &X command nominates the source of its transmit clock signal when operating in synchronous mode. The receive clock is always derived from the receive (remote) carrier signal. Options AT&X0 n Synchronous clocks generated by Modem. The modem generates the transmit clock and applies it to pin 15 of the RS- 232 socket AT&X1 Clocks generated by computer - external clocking.
Page 125: At&Yn Select Stored Profile On Power Up
AT Commands AT&Yn Select Stored Profile on Power Up The &Yn command determines which stored (User) profile is selected as the Active profile when the modem is switched on and also when &D3 is selected and DTR drops. Options AT&Y0 Select stored profile 0 on power up AT&Y1 Select stored profile 1 on power up...
Page 126: At&Z Stored Phone Number
AT&Z Stored Phone Number The &Z command enables you to store phone numbers in your modem’s nonvolatile memory. The command takes the form &Zn=x, where x is the phone number you want to store and n indicates which of the stored phone numbers it will be saved as. Stored numbers may contain up to 20 characters, including dial modifiers.
Page 127: At#A Universal Remote Access
AT Commands AT#A Universal Remote Access This command allows a controlling modem to take control of a remote modem. All commands of the remote modem(s) are available to the controlling modem, with the exception of the Test commands. (DES keys can be changed and will take effect from the next connection made to the modem.) To initiate remote access, the user of the controlling modem should: •...
Page 128 Range Page 128...
Page 129: At#B 1200Bps Originate Mode
AT Commands AT#B 1200bps Originate Mode The #B command determines whether the modem will use V.23 or V.22 for its 1200 bps originate speed when B0 or B2 is selected. By default, your modem will use V.23 as its 1200 bps connection standard with B0 selected and V.22 with B2.
Page 130: At#C V.25 Calling Tones
AT#C V.25 Calling Tones The #C command determines whether the modem will generate V.25 calling tones when operating in originate mode. V.25 calling tones are generated as a measure of courtesy if the telephone number you dial is answered by a person rather than a modem or other electronic device. It also allows an electronic device to select the appropriate operating mode.
Page 131: At#Cid Caller Id
AT Commands AT#CID Caller ID The #CID command allows the user can set up the modem to display the number of all inbound calls and selectively answer or not answer the call depending on whether the caller is known. The modem can also be programmed to play a unique ‘tune’ if the caller is known. When enabled a message will be inserted between the 1st and 2nd RING responses from the modem.
Page 132 Options AT#CID0 n Caller ID disabled AT#CID1 Caller ID enabled AT#CID2 Caller ID enabled with response to host in hex format AT#CID3 Caller ID enabled with extended response See Also Refer to the section on Caller ID #S Command Security Menu Range Page 132...
Page 133: At#D V.25Bis Direct Calling
AT Commands AT#D V.25bis Direct Calling This command determines whether direct calling procedures (or ‘DTR dialling’) will be used when V.25bis mode is selected. Refer to the section titled ‘Direct Dialling’, which appears in the V.25bis chapter, for details of how direct dialling works.
Page 134: At#E Encryption
AT#E Encryption The #E command allows you to select DES encryption operating mode. The #E1 command enables standard DES encryption. DES encryption allows you to encrypt data being passed to a remote modem. The remote modem must support Cipher Feedback (or CFB) DES encryption to decrypt the data sent from your modem.
Page 135: At#H Display Help
AT Commands AT#H Display Help The #H or ? command may be followed by a command or keyword to display a description of a command. See Also ? Command Display Commands Page 135...
Page 136: At#I V.22Bis Leased Line
AT#I V.22bis Leased Line The ITU specifies that in V.22 and V.22bis a different handshake should be used for leased line mode. This mode is specified by default. Some modems still use the standard PSTN handshake for leased line connections. Use #I1 to connect to these modems in V.22bis leased line mode.
Page 137: At#J V.42 Capability Checking
AT Commands AT#J V.42 Capability Checking The #J command allows you to select whether your modem will check if the modem it is connecting to supports V.42, MNP or no error correction. This command only affects your modem when it dials another modem. If #J0 is selected, your modem will assume the answering modem is a V.42 modem.
Page 138: At#K Mnp 10 Mode
AT#K MNP 10 mode MNP 10 works in conjunction with error correction and data compression to improve the performance of your modem when operating with poor or varying quality telephone lines (as sometimes found with cellular or overseas telephone connections). MNP is the only type of error correction allowed with MNP 10 and is only available when connected to another modem that supports MNP 10.
Page 139: At#M Command Mode Selection
AT Commands AT#M Command Mode Selection The #M command selects AT command mode or V.25bis operating mode. See the section — V.25bis Operations — for an explanation of V.25bis. The #M command doesn’t take effect until the an AT&W and an ATZ command are issued. Options AT#M0 n AT command operation...
Page 140: At#N V.25Bis Character Encoding
AT#N V.25bis Character Encoding Use the #N command to select either NRZ or NRZI character encoding for V.25bis synchronous operation. This command only takes effect when a synchronous V.25bis operating mode is selected. Before setting the #N command, check which character encoding method is expected by your computer.
Page 141: At#O Buffer Overflow
AT Commands AT#O Buffer Overflow The #O command decides what happens when your modem buffers fill and can no longer accept data. This will occur if data is received faster than your computer or modem can accept it. The #O command is not supported when a variable speed mode connection is established.
Page 142: At#Q V.25Bis Terminal Speed
AT#Q V.25bis Terminal Speed This command allows you to specify the V.25bis terminal speed. When AT#Q0 is issued, your modem will use the speed at which you issued the last AT command for V.25bis mode. Alternatively, you may issue one of the other #Q commands to select a specific V.25bis terminal speed.
Page 143: At#R Enable Remote Control
AT Commands AT#R Enable Remote Control The #R command allows a remote modem to control your modem. Once a connection has been established, issuing the #R command will enable remote control mode. After the command is issued, any commands the remote modem sends to your modem will be acted upon by your modem, as if commands were being issued from the computer attached to your modem.
Page 144: At#S Security Menu
AT#S Security Menu The #S command orders the modem to enter the Security Menu mode. When the modem is in Security Menu mode, the Security Menu will be displayed on your computer screen: SECURITY MENU Q = Quit 1 = List Users 2 = Add or Change Users 3 = Delete All Users 4 = View Access Record...
Page 145: At#U V.25Bis Character Set
AT Commands AT#U V.25bis Character Set The #U command is used to select the character set to be used when V.25bis mode is selected. ASCII characters are used by most computers; EBCDIC characters are used primarily by IBM mainframe computers. Options AT#U0 n ASCII character set...
Page 146: At#V Verifier
AT#V Verifier The #V command selects whether your modem will check the validity of the commands you issue to it. Your modem can check both AT commands and values you write to the S Registers. When you use the #V0 command, no checking is performed on commands you issue. If you issue an unsupported command, the modem responds with an OK message.
Page 147: At%B Autoanswer Setting
AT Commands AT%B AutoAnswer Setting The %B command sets the number of rings before your modem answers. The default setting %B0 turns off AutoAnswer. Options AT%B0 n S0=0 No AutoAnswer AT%B2 S0=2 Modem answers after two rings Page 147...
Page 148: At%C Compression Control
AT%C Compression Control Data compression is a technique used to reduce the size of data being transmitted without losing any of the original information. Compressed data must be decoded at the receiving end of the communications path in order to extract the original information.
Page 149: At%D Set Disconnect Delay
AT Commands AT%D Set Disconnect Delay The %D command enables you to set a delay between the time the modem is told to hang up and when it actually goes on hook. The modem will hang up whenever you issue an ATH command or the DTR (Data Terminal Ready) signal is lowered —...
Page 150: At%E Auto Eqm Retrain
AT%E Auto EQM Retrain The %E command allows an originating modem to automatically retrain its comunications equalisers during V.22bis MNP connections, or change the speed at twhich it is connected to another modem. S Register 33 and S Register 45 contain EQM (Eye Quality Monitor) threshold values. When the quality of the connection deteriorates to this value, the modem will attempt to retrain the connection.
Page 151: At%F Dtr/Dsr Override
AT Commands AT%F DTR/DSR override Front panel Option switches 1 and 2 may be used to control the DTR and DSR signals, or select V.25bis operation. Refer to the Dumb Mode section for details Options AT%F0 A & B switches control V.25bis function AT%F1 n Switch A forces DTR on, Switch B forces DSR high Range...
Page 152: At%H Mnp 10 Negotiation Speed
AT%H MNP 10 Negotiation Speed This command allows you to determine the speed at which your modem will begin MNP 10 connections. MNP 10 can change the speed of the connection depending upon the quality of the line. This command sets the initial connection speed only. By initiating MNP 10 at a lower speed you can ensure that an error correcting link is established when this may not be possible at the highest speeds.
Page 153: At%K Cts During Dial And Handshake
AT Commands AT%K CTS During Dial and Handshake This command may be used with computers that expect the CTS signal to be raised when your modem is connected to a remote modem and is ready to send data. This command will interfere with the Abort Connection command (&N) if your computer cannot send characters to the modem when CTS is low.
Page 154: At%L Display Line Signal Level
AT%L Display Line Signal Level The %L command allows you to display the received signal level. The value returned is a 3-digit number, for example: 009 = -9 dBm 043 = -43 dBm AT%L Display received signal level Examples • Type: AT%L <E> The line signal level is displayed.
Page 155: At%Ln Transmit Level (Data Mode)
AT Commands AT%Ln Transmit Level (Data Mode) This command allows you to alter the transmit level of your modem. The command is in the form: AT%Ln where n is the level you wish to select. For example: To set the transmit level to -15dBm: •...
Page 156: At%M Mode Led Indication
AT%M Mode LED Indication If your modem has three ‘Mode’ LEDs, you can use the %M command to determine whether the LEDs will indicate the line speed or the quality of the line. The Mode LEDs provide an indication of the line speed or line quality when you are connected to another modem only.
Page 157: At%N Non-Standard Terminal Speeds
AT Commands AT%N Non-Standard Terminal Speeds Options AT%N0 n Standard Baud Rates AT%N1 Standard to 14400 then 20800, 31200, 41600 and 62400 AT%N2 Standard to 38400 then 51200 Page 157...
Page 158: At%P Connect Message Timing
AT%P CONNECT Message Timing This command allows you to determine whether the CONNECT message will be sent before or after the DCD signal is asserted by your modem. Some Unix computers require the CONNECT message to appear after DCD is asserted. In this case, the AT%P1 command should be used. Options AT%P0 n CONNECT message appears before DCD is asserted...
Page 159: At%Q Line Signal Quality
AT Commands AT%Q Line Signal Quality The %Q command allows you to display the line signal quality. This command is not applicable to V.21, V.23 or Bell 103 connections. A lower value indicates a good quality connection.Values above 40 indicate a bad quality line signal and that you should shift to a lower speed or use MNP10.
Page 160: At%R Cts Override
AT%R CTS Override The %R command allows you to determine the state of the CTS signal. This command is intended to replace the CTS switch if your modem does not have one (eg Pocket & Rack Modems) This command overrides any &R setting. The %R command does not revert to the default setting after an ATZ, AT&F or modem power off is performed.
Page 161: At%S Dsr Override
AT Commands AT%S DSR Override The %S command allows you to determine the state of the DSR signal. This command is intended to replace the DSR switch if your modem does not have one (eg. Pocket & Rack Modems). If your modem has a DSR option switch, the switch setting will take preference to %S. %S1 overrides any &S setting.
Page 162: At%T Dcd Override
AT%T DCD Override The %T command allows you to determine the state of the DCD signal. This command is intended to replace the DCD switch if your modem does not have one (eg. Pocket & Rack Modems). If your modem has a DCD option switch, the switch setting will take preference to %T. %T1 overrides any setting of &C The %T command does not revert to the default setting after an ATZ, AT&F or modem power off is performed.
Page 163: At%U V.42 Response Codes
AT Commands AT%U V.42 Response Codes The %U command allows you to change the response codes issued by your modem when a V.42 connection is established. Compression & encryption messages will be added if active. After the %U1 command is issued, if your modem establishes a connection with V.42 error correction, a CONNECT/LAP-M message will be sent to your computer.
Page 164: At%W Welcome Message
AT%W Welcome Message The %W command allows the answering modem to send a user specified message to the originating modem immediately after connection. This facility can be used to identify a company name, a particular service provided by this modem or simply to identify the modem itself. The message to be sent to the remote modem is specified by using the *W command.
Page 165: At\A Mnp Block Size
AT Commands AT\A MNP Block Size The \A command allows you to select the maximum block size to be used by your modem over an MNP error-corrected connection. Options AT\A0 64 character block size AT\A1 128 character block size AT\A2 192 character block size AT\A3 n 256 character block size...
Page 166: At\Bn Generate Break
AT\Bn Generate Break The \Bn command is used to send a break sequence to the remote modem of length n*100mS. The length of the break sequence may be set from 0.1 seconds to 0.9 seconds. The default length of breaks generated by the modem is 0.3 seconds. The \K command determines how the modem will react when a break sequence is received.
Page 167: At\J Auto-Reliable Fallback
AT Commands AT\J Auto-Reliable Fallback This command allows you to select whether your modem (when operating in auto-reliable mode) will use Constant Speed mode or Variable Speed mode. If, with \J0 selected, an error corrected auto-reliable connection cannot be established with another modem, the modem will fall back to Constant Speed mode.
Page 168: At\K Break Control
AT\K Break Control The \K command determines how the modem will react when a break sequence is sent from your computer or received from the remote modem. During error corrected connections the modem sending the break determines how the receiving modem will react. During non-error corrected connections, the receiving modem determines how it will react.
Page 169 AT Commands If a break sequence is received by the modem while it is in local command state (and is maintaining a constant speed connection), the modem will not process the break until it returns to on-line state. If the break sequence is received by the modem while it is in local command state and maintaining a variable speed connection, the break will be ignored.
Page 170: At\N Asynchronous Operating Mode
AT\N Asynchronous Operating Mode The \N command allows you to select any of your modem’s four asynchronous operating modes. AT\N0 selects constant speed mode, enabling the modem to use different terminal and line speeds. Your modem supports constant terminal speeds from 300 bps to 460,400 bps. For example, with constant speed selected the modem could connect with a remote system using V.22 (1200 bps) while communicating with your computer at 115,200 bps.
Page 171 AT Commands See Also B command Communications Standard &K command Flow Control \J command MNP Fallback #J command V.42 Detect Phase Range Page 171...
Page 172: At\Q Extended Flow Control
AT\Q Extended Flow Control The \Q command enables you to select flow control (handshaking) between your modem and computer. While performing the same function as the &K command, the \Q command provides compatibility with Microcom modems. Flow control is only available when the modem is configured for constant speed mode or reliable or auto-reliable modes, and is operating in on-line state.
Page 173: At\S Display Active Configuration
AT Commands AT\S Display Active Configuration The \S command allows you to display the current active configuration. The following is a sample of the \S command output: Options AT\S Display Active Configuration Page 173...
Page 174: At\Tn Inactivity Timer (Data Mode)
AT\Tn Inactivity Timer (Data Mode) The \Tn command specifies the number of minutes the modem will stay on line when no activity is occurring. The timer may be set from 1 to 42 minutes of inactivity. Selecting 0 minutes will disable the timer.
Page 175: At\V Error Correction Response Codes
AT\V Error Correction Response Codes The \V command allows you to select the error correction response codes when an error corrected connection is established. With error correction response codes enabled, the messages are returned when a connection is established using error correction. If the ATX0 command has been issued, only the CONNECT/REL will be generated by the modem, regardless of the connection speed, after the \V1 command is issued.
Page 176: At\X Xon/Xoff Pass Through
AT\X XON/XOFF Pass Through The \X command enables you to define whether XON and XOFF (software handshake) characters are allowed to pass through the modem to the remote system. The \X command only affects XON/XOFF characters sent from your computer to your modem. It does not affect XON/XOFF characters sent from a remote system to your modem.
Page 177: At*K Select Primary Des Key From Stored Keys
AT Commands AT*K Select Primary DES KEY from Stored Keys The *K command allows the user to select the DES key from the 10 available stored keys. Default Range See Also Security Encryption The Security & Encryption section contains information on the application of the *K command.
Page 178: At*R V.13 Remote Rts Signalling
AT*R V.13 Remote RTS Signalling The *R command allows your modem to simulate carrier control on a Synchronous Link by transmitting the local state of RTS to the remote modem. Some systems rely on RTS as an indicator of Terminal Ready to Send. When modems are inserted between the host and the terminal the status of RTS is not known since the state of RTS is not normally transmitted over the link.
Page 179: At*S Change Current User Password
AT Commands AT*S Change Current User Password The *S command allows the user to change their own password. If the user is connected the modem will ask for the current password before prompting for a new password. The user will then be asked to repeat the new password for verification.
Page 180: At*T Auto Call Redial
AT*T Auto Call Redial The *T command allows you to select whether the modem will redial the last number dialed automatically. If enabled the modem will dial the last number after 10 seconds. Options AT*T0 n Disable auto call redial AT*T1 Enable auto call redial Range...
Page 181: At*V Maximum V.42Bis Dictionary Size
AT Commands AT*V Maximum V.42bis Dictionary Size The V.42bis dictionary size is normally negotiated during the V.42 handshake. The modem has enough memory to store 8,192 dictionary entries. This will allow 8:1 compression on some file types. Some modems do not correctly negotiate the dictionary size, in these cases the user should reduce the dictionary size to 2,048 entries (4:1 compression ratio).
Page 182: At*W Welcome Message Text
If %W1 is enabled the text you have specified will be displayed at the end of the &V display. Examples ® AT*W You are connected to a BLACK BOX MD1276A modem This will send the text to the remote modem after connection, informing the modem that it is ®...
Page 183: At*Y Escape Seq. Detection In Sync
AT Commands AT*Y Escape Seq. Detection in Sync. Escape Sequence Detection (i.e. +++) is normally disabled in all synchronous modes. This is because synchronous data cannot generate silences around the +++. However to diagnose line performance you need to be able to escape to command mode. To allow these diagnostics to take place the user may select the *Y1 option before making a synchronous connection and then attaching a asynchronous terminal to the modem.
Page 184: At+Icf Character Framing And Parity Select
AT+ICF Character Framing and Parity Select The +ICF command is used in conjunction with the R command to select the character format and parity of the RS232 interface when not in autobauding mode or if autobauding to 230kbps. The syntax is: AT+ICF=<format>[,<parity>] Format can be: auto 8 data bits no parity 2 stop bits...
Page 185: At+Ms Select Modulation
AT Commands AT+MS Select Modulation The +MS command selects the modulation, optionally enables or disables automode, and optionally specifies the lowest and highest connection rates using one to six subparameters. The command format is: +MS= <mod> [,[<automode>][,[<min_rate>][,[<max_rate>][,[<x_law>][,[<rb_signaling>]]]]]<CR> Subparameters not entered (enter a comma only or <CR> to skip the last subparameter) remain at their current values.
Page 186 41333, 40000, 38667, 37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000 56 K 56flex 56000, 54000, 52000, 50000, 48000, 46000, 44000, 42000, 40000, 38000, 36000, 34000, 32000 Bell 103 Bell 212 1200 The modem may also automatically switch to another modulation (automode), subject to the following constraints: •...
Page 187 AT Commands V.8 is not supported by the remote modem. • When V.90 is enabled the speeds listed can be used to set the maximum speed. For example: AT+MS=12,1,300,38667 This sets the maximum V.90 speed to 38667. Only the maximum speed is applicable when using V.90.
Page 188 <rb_signaling> is an optional number which enable or disables robbed bit signaling generation in a server modem or enables or disables robbed bit signaling detection in a client modem. The option are: 0 = Robbed bit signaling generation (server modem) or detection (client modem) disabled (default) 1 = Robbed bit signaling generation (server modem) or detection (client modem) enabled +MS? Reporting selected options...
Page 189: At+Ms=? Reporting Supports Options
AT Commands AT+MS=? Reporting Supports Options The modem can send a string of information to the DTE consisting of supported options: Options +MS=? Example +MS: (0, 1, 2, 3, 8, 9, 10, 11, 12, 56, 64, 69, 74), (0,1) (300-56000), (300-56000) See Also +MS? Reporting selected options...
Page 190: At-Q Mnp10 Fallback To V.22Bis
AT-Q MNP10 Fallback to V.22bis The -Q command permits the modem to fallback from a V.34, V.32bis or V.32 connection with MNP10, to a V.22bis or V.22 MNP10 connection. MNP10 has the ability to make decisions regarding line quality and will request a change in speeds if it decides the phone line is not sufficient quality to maintain the current connection speed.
Page 191: At-Date Time & Date
AT Commands AT-DATE Time & Date The -DATE command allows the modem to record the Time and Date in the log information inbound and outbound calls. The Time and Date will be set by an inbound call with Caller ID information or by issuing the AT-DATE command.
Page 192: At-Log Call Log
AT-LOG Call Log The AT-LOG command will automatically record the Date, Time, Phone Number and Name of any inbound call that has Caller ID information. In addition the modem will also log all outbound calls that are originated by the modem and record the phone number, connect speed, disconnect reason and call duration.
Page 193: At:e V.32 Compromise Equaliser
AT Commands AT:E V.32 compromise Equaliser This command switches on or off the V.32 compromise equaliser. When operating over cellular connections, it may be desirable to switch off the V.32 compromise equaliser. For dial-up lines, the equaliser should be switched on. Options AT:E0 Disable the V.32 compromise equaliser...
Page 194: V.25Bis - Cic Connect Incoming Call
V.25BIS - CIC Connect Incoming Call The CIC command may be issued if you decide to accept an incoming call after issuing the DIC command. For details, refer to the ‘V.25bis Operations’ section of this guide. Options CIC Accept an incoming call after the DIC command has been issued See Also DIC command Disregard Incoming Call...
Page 195: V.25Bis - Crn Dial
AT Commands V.25BIS - CRN Dial This command allows you to dial a telephone number. The basic dialling command is: CRN followed by the telephone number. For example: To dial the number (09) 111-1234 • Type: CRN091111234 <E> You can use hyphens, spaces or parentheses. They will be ignored by the modem, but they will make it easier to read the command line.
Page 196 & hook flash The & dial modifier issues a hook flash signal — the modem hangs up for a short period. Hook flashes are commonly used with PABXs to transfer calls. For example: To dial 0, hook flash and then dial 12345: •...
Page 197: V.25Bis - Crs Dial Stored Number
AT Commands V.25BIS - CRS Dial Stored Number Your modem allows you to store phone numbers in non-volatile memory. The basic form of the CRS command is: CRS n where n is the stored phone number you wish to dial. For example: To dial stored phone number one: •...
Page 198: V.25Bis - Dic Disregard Incoming Call
V.25BIS - DIC Disregard Incoming Call The DIC command is used to disregard incoming calls. When your modem receives an incoming call, an INC message is sent to your computer. You then have the number of seconds defined by S Register 71 to disregard the call. If you issue the DIC command, the call will be ignored, otherwise the modem will answer the call after the number of seconds defined by S Register 71.
Page 199: V.25Bis - Prn Stored Phone Number
AT Commands V.25BIS - PRN Stored Phone Number The PRN command allows you to store phone numbers in your modem’s nonvolatile memory. The command takes the form: PRNn;x where x is the phone number you want to store and n indicates which of the stored phone numbers it will be saved as.
Page 200: V.25Bis - Rst Reset
V.25BIS - RST Reset Your modem is supplied with a default operating set up. You can change this temporarily by issuing commands while you are working, or permanently by using the &W command to store changes you’ve made in non-volatile memory. The RST command returns the modem to the last saved configuration and causes it to perform a power-on self-test.
Page 201: S Registers
S Registers S Registers Introduction Your modem contains a number of registers — memory stores — which define the modem’s operating characteristics. These registers are called Special Registers or S Registers. This section describes the function and usage of each S Register, how to check the current contents of your S Registers, how to change S Register settings and how to save the settings in non-volatile memory.
Page 202 ROM chips that have their data placed into them at the factory. They retain their information when the power is switched off. You cannot make changes to information stored in ROM chips. Information such as factory default settings for S Registers is stored in your modem’s ROM chips.
Page 203: Ats0 Rings Before Answer
S Registers ATS0 Rings Before Answer S Register 0 contains a decimal value (from 0-255) indicating the number of rings the modem will wait before answering an incoming call. If you place a value of 0 in this S Register, auto-answer operation will be disabled. The default value for S Register 0 is 0 —...
Page 204: Ats1 Ring Count
ATS1 Ring Count S Register 1 contains a decimal value (from 0 to 255) indicating the number of rings detected. S Register 1 is incremented each time a ring is detected. It will be cleared if no ring occurs within 8 seconds of the last ring.
Page 205: Ats2 Escape Sequence Character
S Registers ATS2 Escape Sequence Character S Register 2 contains the ASCII value of the characters which form the escape sequence. The default value for this register is 43. The modem will recognise three + characters (+++) as the escape sequence. Setting this register to a value greater than 127 disables the modem’s recognition of the escape character.
Page 206: Ats3 Carriage Return Character
ATS3 Carriage Return Character S Register 3 contains the ASCII value of the character recognised by the modem as the Carriage Return character in local command state. Default Example ATS3=127 Recognise the DEL character as the carriage return Range 0-127 Page 206...
Page 207: Ats4 Line Feed Character
S Registers ATS4 Line Feed Character S Register 4 contains the ASCII value of the character recognised by the modem as the Line Feed character in local command state. Default Example ATS4=13 Recognise the Carriage Return character as the line feed Range 0-127 Page 207...
Page 208: Ats5 Backspace Character
ATS5 Backspace Character S Register 5 contains the ASCII value of the character recognised by the modem as the Backspace character in local command state. The preferred values for this register are ASCII codes 0 to 32 or 127. Default Example ATS5=127 Recognise the DEL character as the backspace.
Page 209: Ats6 Dial Tone Wait Time
S Registers ATS6 Dial Tone Wait Time S Register 6 determines how long the modem will wait for a dial tone after going off-hook and before dialling. This register contains a value indicating the number of seconds the modem will wait for a dial tone.
Page 210: Ats7 Wait For Carrier
ATS7 Wait for Carrier S Register 7 contains a value, in seconds, equivalent to the length of time the modem will wait for answer tone after dialling. If an answer tone is not detected within the time specified in this register, the modem will hang up and return a NO CARRIER message.
Page 211: Ats8 Pause Dial Modifier Delay
S Registers ATS8 Pause Dial Modifier Delay S Register 8 contains the time in seconds the modem will wait when it encounters a comma (the pause dial modifier) in a dialling sequence. UK Modems. Changing S Register 8 from its default value may invalidate the approval of your modem.
Page 212: Ats9 Carrier Detect Response Time
ATS9 Carrier Detect Response Time S Register 9 contains the length of time, in tenths of a second, the modem will wait before asserting the DCD (Data Carrier Detect) signal, after a carrier has been detected. The longer the time taken before asserting DCD, the less chance of line noise being mistaken by the modem as a carrier signal.
Page 213: Ats10 Lost Carrier/Hang Up Delay
S Registers ATS10 Lost Carrier/Hang Up Delay S Register 10 contains the amount of time, in tenths of a second, the modem will wait after the carrier has been lost before hanging up. If a value of 255 is placed in this register, the modem will not hang up after the carrier is lost from the remote modem.
Page 214: Ats11 Dtmf Tone Timing
ATS11 DTMF Tone Timing S Register 11 contains the time, in thousandths of a second, of the duration and spacing of tones when tone dialling (DTMF tones). Examples ATS11=120 Space tones at 0.120 second intervals Default Range 70-254 Page 214...
Page 215: Ats12 Escape Sequence Guard Time
S Registers ATS12 Escape Sequence Guard Time The Escape Sequence Guard Time is the time delay required immediately before and after entering an escape sequence. For your modem to distinguish the escape sequence from ordinary data, there must be a period of silence both before and after the escape sequence is entered.
Page 216: Ats16 Test In Progress (Read Only)
ATS16 Test in Progress (read only) S Register 16 contains the number of the &T test command in progress. If no test is in progress S16 is 0. Examples ATS16 Default See Also &T Self Test S Register 18 Test Timer Range Page 216...
Page 217: Ats18 Test Timer
S Registers ATS18 Test Timer S Register 18 contains the length of time, in seconds, that the modem will perform tests initiated with any of the &T commands. You can terminate any test by issuing an AT&T0 command, or by allowing the time in the Test Timer to expire.
Page 218: Ats25 Dtr Loss Detection
ATS25 DTR Loss Detection S Register 25 determines the time, in hundredths of a second, the DTR (Data Terminal Ready) signal must remain low before the modem will recognise a loss of DTR. Examples ATS25=8 DTR must remain low for 0.08 seconds before the modem will recognise loss of DTR Default See Also...
Page 219: Ats26 Rts/Cts Delay
S Registers ATS26 RTS/CTS Delay If the RTS (Request To Send) signal is asserted when operating in synchronous mode, the modem will wait for the period defined by S Register 26 before asserting the CTS (Clear To Send) signal, when &R0 is selected. Values in this register are in tenths of a second.
Page 220: Ats27 Delay Before Dial
ATS27 Delay Before Dial S Register 27 is used to define a delay of between 0 and 255 seconds which occurs after the D command is issued and before dialling commences. This should only be used when you intend to implement callback security. Providing a delay between the dialling command and actual dialling allows the calling modem sufficient time to hang up before the modem begins to call back.
Page 221: Ats29 Hook Flash Duration
S Registers ATS29 Hook Flash Duration This S Register allows you to set the duration of the hook flash performed by your modem when the ! dial modifier is executed. Some PABXs may require a different hook flash length to the standard 0.5 seconds. The value held in S Register 29 is in hundredths of a second.
Page 222: Ats30 Inactivity Timer
ATS30 Inactivity Timer Data Mode This S Register allows you to set the duration of the hook flash performed by your modem when the ! dial modifier is executed. Some PABXs may require a different hook flash length to the standard 0.5 seconds. The value held in S Register 29 is in hundredths of a second.
Page 223 S Registers See Also ATS105Voice ‘Dead-man’ Timer Range 0-255 Page 223...
Page 224: Ats33 Eqm Threshold Value
ATS33 EQM Threshold Value S Register 33 is used to define the rate of change in the EQM (Eye Quality Monitor) value the modem will tolerate before initiating an equaliser retrain sequence. This S Register applies to V.32, V.32bis, V.FC & V.34 only. By setting this register with a low value, the modem will demand a high quality connection.
Page 225: Ats38 Disconnect Delay
S Registers ATS38 Disconnect Delay S Register 38 determines the number of seconds the modem will wait before hanging up after the ATH command is issued or the DTR signal is lowered — after the &D2 command has been issued. If a disconnect delay has been defined, the modem will attempt to empty the contents of its data buffers before actually going on-hook.
Page 226: Ats42 Modem Disconnect Reason
ATS42 Modem Disconnect Reason overflowed Receive data buffer (terminal buffer) overflowed S Register 42 contains a value indicating the Failure to negotiate MNP class reason the modem last disconnected. 3 or 4 connection Inactivity timer expired This allows you to check for possible faults if Unable to establish MNP your modem suddenly hangs up or returns to connection with reliable mode...
Page 227: Ats43 Break Sequence Length
S Registers ATS43 Break Sequence Length The value in S Register 43 defines the length of a break (long space) sequence generated by the modem to your computer when constant speed, reliable or auto-reliable modes are selected. The \B command determines the length of breaks to the remote modem. Each unit is equivalent to 0.02 second.
Page 228: Ats45 V.22Bis Eqm Threshold Value
ATS45 V.22bis EQM Threshold Value S Register 45 is used to define the EQM (Eye Quality Monitor) value the modem will tolerate before initiating an equaliser retrain sequence. This S Register applies to V.22bis only. By setting this register with a low value, the modem will demand a high quality connection. Setting a high value will allow the modem to operate on degraded lines without invoking retrains.
Page 229: Ats57 Dtr High Detection
S Registers ATS57 DTR High Detection S Register 57 determines the amount of time, in hundredths of a second, that the DTR (Data Terminal Ready) signal must be high before the modem will recognise DTR being asserted. Example ATS57=8 DTR must be high for 0.08 seconds before the modem will recognise DTR being asserted Default See Also...
Page 230: Ats62 V.42 Detection Timer
ATS62 V.42 Detection Timer S Register 62 allows you to set the V.42 detection timer. This specifies how long (in units of 0.01 seconds) the modem will send a V.42 detection pattern and wait for a V.42 detection pattern from the other modem. The originating modem sends the pattern then waits for a reply, the answering modem waits for the pattern then sends one in reply.
Page 231: Ats66 Remote Access Guard Time
S Registers ATS66 Remote Access Guard Time The Remote Access Guard Time is the time delay required immediately before and after entering a remote access sequence. If the Remote Access Guard Time is one second and the remote access character has been defined as * (asterisk), you must maintain silence on the line for one second, then type **** (four asterisks) in rapid succession, then maintain another one second’s silence.
Page 232: Ats67 Remote Access Character
ATS67 Remote Access Character S Register 67 contains the ASCII value of the characters which form the remote access sequence. The default value of this register is 42 (asterisk character). The modem will recognise four * characters (****) as the remote access sequence. Examples ATS67=36 Recognise four $ ($$$$) characters as the remote access sequence...
Page 233: Ats69 Command Line Time-Out
S Registers ATS69 Command Line Time-out S Register 69 determines how long you have to type a command, after typing an ‘AT’, expressed as seconds. If the modem times-out before you complete a command, an ERROR message will be sent by the modem.
Page 234: Ats71 Ignore Incoming Call
ATS71 Ignore Incoming Call This S Register is only applicable when your modem is operating in V.25bis mode. After an incoming call is detected, your modem will wait the number of seconds defined by S Register 71, allowing you to issue the DIC command if you do not wish to accept the call. For more details, refer to the section titled ‘Answering Calls’...
Page 235: Ats74 Disconnect Reason For Prev. Call
S Registers ATS74 Disconnect Reason for Prev. Call S Register 74 contains a value indicating the reason the modem returned to local command state, for the call before last. Thus, the value in S Register 42 will be copied to S Register 74 prior to a new disconnect reason being placed in S Register 42.
Page 236: Ats80 Flow Control High Water Mark
ATS80 Flow Control High Water Mark This S Register controls when your modem uses flow control to stop data from your computer. Data to be sent by your modem is stored in a ‘buffer’ (a temporary storage area) until it can be sent by your modem.
Page 237: Ats81 Flow Control Low Water Mark
S Registers ATS81 Flow Control Low Water Mark This S Register controls when your modem uses flow control to resume the transmission of data from your computer. Refer to S Register 80 for a description of flow control water marks. Do not change the value of this S Register unless you are an experienced communications user.
Page 238: Ats82 Failsafe Flow Control Overrun
ATS82 Failsafe Flow Control Overrun This S Register works in conjunction with the AT&K9 command. If you are in &K9 mode and the modem needs to assert flow control it first drops CTS. If the host is using CTS flow control it should stop sending further characters.
Page 239: Ats95 Extended Response Codes
S Registers ATS95 Extended Response Codes S Register 95 allows your modem to display extended response codes (or result codes). Because this S Register is a ‘bit-mapped’ register, values must be changed by storing the decimal number equivalent of the binary value represented bt the total of the bits. Examples ATS95=46 Displays the CARRIER, PROTOCOL and COMPRESSION messages and...
Page 240: Ats96 Help Page Width
ATS96 Help Page Width This S Register allows you to set the width of each Help page and the Configuration Profile (&V). You may change the width of each page to suit your computer. Examples ATS96=40 Set the Help page width to 40 characters Default See Also S Register 97...
Page 241: Ats97 Help Page Length
S Registers ATS97 Help Page Length This S Register allows you to set the length of each Help page and the Configuration Profile (&V). You may change the length of each page to suit your computer. Examples ATS97=10 Set the Help page length to 10 lines Default See Also S Register 96...
Page 242: Ats105 Voice 'Dead Man' Timer
ATS105 Voice ‘Dead Man’ Timer This S Register sets how long the modem remains in voice mode, when onhook and in non- autobauding mode, and when no characters are received from the computer. If the ‘Dead Man’ timer expires, the modem returns to data mode. This register may also be accessed by writing to S30 when in voice mode.
Page 243: Ats122 Autoratechange
S Registers ATS122 AutoRateChange The maximum average EQM level reached before the modem will downshift a speed. The default is 55 which means that if the average EQM ever goes higher than 55, then a downshift in speed will occur. EQM stands for Eye Quality Monitor, and is a reading of the current line quality.
Page 244: Ats123 Autoratechange
ATS123 AutoRateChange This S Register sets the average EQM limit that the modem must do better than, to achieve an upshift. The default is 16 which means that for an upshift to be possible the average EQM must be 16 or lower (for S124 + 12 seconds). Default Range 0-20...
Page 245: Ats124 Duration Eqm
S Registers ATS124 Duration EQM This S Register sets the number of seconds after 12 that the modem must maintain the average EQM below the S123 value. The default is 30 which means that for an upshift to be possible with a setting of S123=16, the modem must maintain an average EQM of below 16 for a minimum of 42 seconds.
Page 246: Modem Response Codes
Modem Response Codes Numeric Verbal Meaning Command executed CONNECT Connection established RING Ringing signal detected NO CARRIER Carrier lost or not detected ERROR Command error, command longer than 80characters or timeout CONNECT 1200 Connection at 1200 or 1200/75 bps NO DIALTONE Dial tone not detected on line BUSY Number dialed was engaged...
Page 247 Modem Response Codes CONNECT 36000/REL Error corrected connection at 36,000 bps CONNECT 38000/REL Error corrected connection at 38,000 bps CONNECT 40000/REL Error corrected connection at 40,000 bps CONNECT 42000/REL Error corrected connection at 42,000 bps CONNECT 44000/REL Error corrected connection at 44,000 bps CONNECT 46000/REL Error corrected connection at 46,000 bps CONNECT 48000/REL...
Page 248: Rs-232 Signals
RS-232 Signals This section describes each of the signals supported on the modem’s RS-232 socket. Pin assignments are only applicable to products with a 25-pin DB-25 connector. Refer to your Product Guide for information regarding the pin assignments for your product. Transmit Data (TxD) - Pin 2 The computer transmits data to the modem via this pin.
Page 249 RS-232 Signals Data Carrier Detect (DCD) - Pin 8 This signal indicates the presence of a compatible carrier signal. In asynchronous mode, the modem may be configured to assert DCD at all times, ignoring the presence of an incoming carrier signal. The &C command allows control over the state of the DCD signal. Transmit Clock (TxC) - Pin 15 This signal only affects the operation of the modem when synchronous mode is selected.
Page 250 Standard RS-232 Examples Page 250...
Page 251: Abbreviated Command List
Abbreviated Command List Abbreviated Command List General Commands Escape Sequence Return to local command state **** Remote Access Sequence Interactive Command Help Repeat last command Answer an incoming call Select Communications Standard Auto-Connect Auto-Connect Auto-Connect V.21 at 300bps Bell 103 at 300bps V.23 at 1200/75bps V.22 at 1200bps Bell 212A at 1200bps...
Page 252 K56flex at 38,000bps K56flex at 40,000bps K56flex at 42,000bps K56flex at 44,000bps K56flex at 46,000bps V.90 at 28,000bps (K56flex at 32,000bps) V.90 at 29,333bps (K56flex at 34,000bps) V.90 at 30,667bps (K56flex at 36,000bps) V.90 at 32,000bps V.90 at 33,333bps V.90 at 34,667bps V.90 at 36,000bps V.90 at 37,333bps V.90 at 38,667bps (K56flex at 48,000bps)
Page 253 Abbreviated Command List Speaker is always on Speaker is off whenever the modem is dialling or once a connection is established Speaker is on whenever the modem is dialling or answering. The speaker will also be on during retrains or rate changes. Enter on-line state Enter on-line state &...
Page 254 19,200 bps (locked terminal speed - no autobaud) 21,600 bps (locked terminal speed - no autobaud) 24,000 bps (locked terminal speed - no autobaud) stored profile 0 26,400 bps (locked terminal speed - Restore active configuration from no autobaud) stored profile 1 28,800 bps (locked terminal speed - Restore active configuration from no autobaud)
Page 255 Abbreviated Command List &F1 Select non-error correction factory & W 0 Save current configuration into defaults profile 0 &F2 Select synchronous mode factory & W 1 Save current configuration into defaults profile 1 &G0 n Do not generate guard tones &...
Page 256 Check V.42 compatibility 10 connection speed. The B setting is the maximum speed. Disable MNP 10 Initial connection speed is made at #K1 n Enable MNP 10 1200 bps (V.22). The maximum Enable MNP 10 with cellular speed is defined by the B setting. options Initial connection made at 4800 #M0 n...
Page 257 Abbreviated Command List &F.) Enable error correction response codes plus details of the error %U0 n Standard error correction response correction and data compression codes negotiated with the remote modem V.42 response codes sent when a is displayed immediately before the V.42 error corrected connection is CONNECT message.
Page 258 V.90 56000, 54667, 53333, 52000, Last number redial 50667, 49333, 48000, F or ^ Disable calling tones 46667, 44000, 42667, Hook flash 41333, 40000, 38667, Dial stored phone number n 37333, 36000, 34667, Wait for dial tone 33333, 32000, 30667, 29333, 28000 S Registers K56flex...
Page 259 Abbreviated Command List Ignore Incoming Call 0-30 Test Timer Disconnect Reason for Prev. Call 0-255 Flow Control High Water Mark DTR Loss Detection 15 (75% of the buffer) 1-19 0-255 Flow Control Low Water Mark RTS/CTS Delay 1-19 0-255 Failsafe Flow Control Overrun Delay Before Dial 1-255 0-255...
Page 260 Page 260...
Page 261: Glossary
Glossary Glossary ACK (Acknowledge) Control Character transmitted by a receiving device as an affirmation to a sending device. Alphanumeric Roman Letters (alphabetic) and Arabic numbers (numeric). Amplitude The height of a waveform measured in volts. Amplitude Modulation (AM) Transmission of information by varying the amplitude of a carrier signal. Analog Data Data in the form of continuously variable physical qualities.
Page 262 Auto dial The ability to make a connection with another modem automatically. (To dial a number automatically. usually using a stored number.) Auto range The ability of a modem to range over several modem standards to determine the standard of the calling modem.
Page 263 Glossary Bit rate The speed at which bits are transmitted, usually expressed as bits per second (BPS). Block Group of characters treated as a unit for the purpose of data transmission. An acronym for Bits Per Second. Transmission rate of binary numbers. Compare with Baud. Break A special, non-data signal used by computer equipment to interrupt some processes.
Page 264 Character Set The characters that can be coded or used by a particular machine. Clear to Send (CTS) An RS-232 control signal sent by the DCE to indicate that the DTE may begin a transmission. Clock Source of timing signals used in synchronous transmission. Code A predefined set of rules specifying the way data is to be represented by the transmitting and receiving device.
Page 265 Glossary Control Character Any character assigned as ASCII numeric code less than the SPACE character. These characters are used to initiate a control function on the receiving device. Also a symbol you can create by pressing one of your computer’s keys while holding down the Control key. These symbols are not usually printed, and are generally used to control screen formatting and cursor positioning.
Page 266 Data Communications Equipment Equipment that is used to access a communications network. The DCE provides all the functions required to establish, maintain and terminate a connection, and provides the signal conversion required for communications between the Data Terminal Equipment (DTE) and the telephone network.
Page 267 Glossary Default A value, action or setting that is automatically used by a computer system when no other explicit information has been given. Demodulate To recover the information being transmitted by a modulated signal. For example, a conventional radio receiver demodulates an incoming broadcast signal top convert it into sound emitted by a speaker.
Page 268 Double-Digit Keying Pressing two number keys in rapid succession to access a page in a videotex system. The first number accesses an intermediate index (see Intermediate Page) which in turn accesses the page. See also Single-Digit Keying. Dumb Terminal Terminals that do not contain an intelligent microprocessor and usually send data one character at a time.
Page 269 Glossary Control character used to enquire as to the identification or status of a remote device. Even Parity Even parity refers to the addition of a 0 value or 1 value bit to the data bits which form a character to cause an even number of 1 value data bits to be sent. See also Parity. Control character which indicates the End of Text in a transmitted message.
Page 270 Graphics Information in the form of pictures or images. Also, the display of pictures or images on a computer’s display screen. Guard Band Narrow frequency band left unused between adjacent channels to minimize interference. Half Duplex Data transmission in which data may flow in either direction at one time, but not both directions simultaneously.
Page 271 Glossary Header In communications protocols, this is the control information that precedes the message or text portion of a block of data. Hertz (Hz) Unit of frequency, one cycle per second. Horizontal Redundancy Checking (HRC) Technique in which redundant information is included with a block of data for validating the transmitted data at the receiving end.
Page 272 Input/Output. The transfer of information into and out of a computer. International Standards Organization. International Telecommunications Union (formerly known as CCITT). ITU is the principal communications standards organisation. Jack A socket used for telephone line or other electrical connections. Kermit Kermit is a file transfer protocol developed for operating systems which could not support the XModem protocol.
Page 273 Glossary Log on To connect to or access a bulletin board or videotex system. Log Off To disconnect from a bulletin board or videotex system. Longitudinal Redundancy Check Error detection technique that consists of a byte where each bit is calculated on the basis of the parity of all bits in the block in the same position.
Page 274 Multidrop Line Single communications circuit interconnecting many stations (nodes) each containing terminal devices. Multiplex To interleave or simultaneously transmit two or more messages on a single channel. Negative Acknowledgement. This control character indicates that the last block transmitted was in error and that the receiver is expecting a retransmission. Node A point of interconnection on a circuit.
Page 275 Glossary Packet Switched Network System where messages are transmitted in packets, each individually addressed and routed through the network. Packetised Ensemble Protocol (PEP) A patented data transmission technique used by the TrailBlazer modem to transmit data at up 18000 bps on the switched telephone network. Parity A simple method of error checking by which the number of data bits received are added together to ensure that the correct number have been received.
Page 276 PROM Programmable Read Only Memory. Propagation Delay The time required for a signal to travel from one end of a circuit to another. Protocol A set of conventions controlling the timing and format of data communications between two pieces of communications equipment. Protocol Convertor Device that converts from one protocol to another.
Page 277 Glossary Remote System Usually a bulletin board or videotex system that registered users or the public can dial up and communicate with via modem. Request to Send RS-232 control signal by the DTE to inform the DCE that it is ready to transmit data. When used for flow control between the DTE and the modem, this signal indicates to the modem that the DTE is ready to accept data.
Page 278 topic. Often SIGs set up bulletin boards, available only to SIG members. Simplex Data communications in one direction only. Single-Digit Keying Refers to videotex systems where you only need to press one numeric key from an index. See also Double-Digit Keying. Software Computer program or set of computer programs held in storage, and loaded into RAM for execution.
Page 279 Glossary portion of the data block. Synchronous Idle control character transmitted when the line is idle in synchronous transmissions. Synchronous A data transmission in which the time between characters is fixed by synchronising the transmitting and receiving communications equipment. The clock signal is typically derived from the data stream in order to maintain synchronisation.
Page 280 The message portion of a data block in synchronous data transmissions. Turnaround Time The time required to reverse the direction of transmission when operating in half duplex mode. Upload Refers to sending files or text from the user’s computer to another user, a bulletin board or videotex system.
Page 281 Glossary An extension of the original XModem transfer protocol. Added features included transfer of file names, multi-file transfers, increased reliability of error checking and increased data throughput. ZModem Designed to rectify some of the limitations associated with YModem as well as providing support for high speed, packet and network communications environments.
Page 282: Specifications
Specifications Dimensions Height: 31mm Length: 218mm Width: 122mm Communications V.90 56,000bps (K56Flex proprietary standard) ITU-T 33600bps ITU-T 31200bps ITU-T V.34 (2400-33600bps) ITU-T V.32bis (14400bps) ITU-T V.32bis (1200bps) ITU-T V.32 (9600bps) ITU-T V.32 (7200bps) ITU-T V.32 (4800bps) ITU-T V.22bis (2400bps) ITU-T V.22 (1200bps) ITU-T V.23 (1200/75bps) ITU-T V.21 (300bps) Bell 212A (1200bps)
Page 283 Specifications Data Formats Synchronous, Asynchronous: 7/8 data bits Flow Control RTS/CTS, XON/XOFF and Transparent XON/XOFF (async mode only) Error Correction V.42, MNP 2-4, MNP10 Data Compression V.42bis, MNP 5 Encryption DES 64-bit Cypher Feedback (Aust only) SuperSecure Environmental Operating: 0° to +45° C Non-operating: -10°...
Page 284: Fcc Requirements For Telephone-Line Equipment
Compliances FCC REQUIREMENTS FOR TELEPHONE-LINE EQUIPMENT The Federal Communications Commission (FCC) has established rules which permit this device to be directly connected to the telephone network with standardized jacks. This equipment should not be used on party lines or coin lines. If this device is malfunctioning, it may also be causing harm to the telephone network;...
Page 285 Compliances CERTIFICATION NOTICE FOR EQUIPMENT USED IN CANADA The Canadian Department of Communications label identifies certified equipment. This certification means that the equipment meets certain telecommunications-network protective, operation, and safety requirements. The Department does not guarantee the equipment will operate to the user’s satisfaction. Before installing this equipment, users should ensure that it is permissible to be connected to the facilities of the local telecommunications company.
Page 286 FEDERAL COMMUNICATIONS COMMISSION AND CANADIAN DEPARTMENT OF COMMUNICATIONS RADIO FREQUENCY INTERFERENCE STATEMENTS This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio communication.
Page 287 Compliances Servicio—El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de operación. Todo otro servicio deberá ser referido a personal de servicio calificado. El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso. La colocación del aparato eléctrico sobre una cama, sofá, alfombra o superficie similar puede bloquea la ventilación, no se debe colocar en libreros o gabinetes que impidan el flujo de aire por los orificios de ventilación.
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