Multitech BL-Series User Manual
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Multitech BL-Series User Manual

Intelligent data/fax modem
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BL-Series
Intelligent Data/Fax Modem
User Guide

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  • Page 1 BL-Series Intelligent Data/Fax Modem User Guide...
  • Page 2 Furthermore, Multi-Tech Systems, Inc. reserves the right to revise this publication and to make changes from time to time in the content hereof without obligation of Multi-Tech Systems, Inc. to notify any person or organization of such revisions or changes.

  • Page 3: Table Of Contents

    Chapter 1 - Introduction and Description Introduction ... 8 How To Use This Manual ... 8 Modem Features ... 10 1.3.1 2834 Series Features ... 10 1.3.2 1932 Series Features ... 10 1.3.3 1432 Series Features ... 11 Fax Features ... 11 Technical Specifications ...
  • Page 4 Chapter 4 - Manual Dial and Automatic Answer Introduction ... 36 Dialing/On-Line/Answering ... 36 Automatic Leased Line Restoral Operation ... 37 Manual Dial Backup Call Termination ... 37 Dial Backup and Leased Line Restoral ... 37 Dial-Up Operation ... 38 Manual Call Origination ...
  • Page 5 Chapter 8 - Modem Testing Introduction ... 98 Local Analog Loopback Test/V.54 Loop 3 ... 99 Digital Loopback Test/V.54 Loop 2 (Local/Manual) ... 100 Digital Loopback Test/V.54 Loop 2 (Remote/Automatic) ... 101 Back-to-Back Test ... 102 Synchronous Mode Testing ... 103 Local Analog Loopback Test (Synchronous Mode) ...

  • Page 7: Chapter 1 - Introduction And Description

    Chapter 1 - Introduction and Description...

  • Page 8: Introduction

    MultiModemBL User Guide Introduction Welcome to the world of data communications. You have acquired one of the finest intelligent desktop data/fax modems available today, the MultiModem Systems. This User Guide covers various models within the BL series, and unless otherwise noted, all content should be considered relevant to all models.
  • Page 9 Chapter 5 - AT Command Mode Operation Chapter 5 may be the most important chapter of this manual. It begins with an introduction and discussion on Command Mode fundamentals. A flow chart is provided to illustrate Command Mode and On-Line Mode operation and the methods used in each mode. Next, there is a summary of the modem’s commands and responses.

  • Page 10: Modem Features

    MultiModemBL User Guide Modem Features The MultiModem BL Series modem connections can be made on Public Switched Telephone Networks (PSTNs) and/or point-to-point 2-wire and 4-wire leased telephone type circuits. Your modem offers interactive automatic dialing, as well as Command Mode option configuration. You may store up to ten command line/telephone numbers, of up to 60 characters each, in the modem’s nonvolatile memory.

  • Page 11: 1432 Series Features

    Chapter 1 - Introduction and Description 1.3.3 1432 Series Features Your MT1432BL modem is designed according to the international CCITT V.32bis specification for data signalling rates as high as 14.4K bps in full-duplex mode. The major application for the MT1432BL is in 4-wire leased line networks (replacing traditional V.29/ 9600 bps &...

  • Page 12: Technical Specifications

    MultiModemBL User Guide Technical Specifications Your data/fax modem meets the specifications listed below: Tradename Model Numbers 2834 Series: 1932 Series: 1432 Series: Data Rates (modem) 2834 Series: 1932 Series: 1432 Series: Data Rates (fax) All Models: Data Format 2834 Series: 1932 Series: 1432 Series: Compatibility...
  • Page 13 Data Compression All models: V.42bis, (4:1 throughput) or MNP 5 (2:1 throughput) data compression Speed Conversion 2834 and 1932 Series: Serial port data rates adjustable to 300, 1200, 2400, 4800, 9600, 19,200, 38,400, 57,600 and 115,200 bps 1432 Series: Serial port data rates adjustable to 300, 1200, 2400, 4800, 9600, 19,200, 38,400, and 57,600 bps Flow Control Options All models:...
  • Page 14 MultiModemBL User Guide Fax Carrier Frequencies All models: Lease Line Restoral All models: Carrier Frequencies 2834 Series: 1932 Series: 1432 Series: Carrier Frequencies - 2400 & 1200 bps (V.22bis/V.22 or Bell 212A Standard) All models: Carrier Frequencies - 300 bps (Bell Standard) All models: Carrier Frequencies - V.21 All models:...
  • Page 15 Receiver Sensitivity All models: -43 dBm under worst case conditions AGC Dynamic Range All models: 43 dB Interface All models: EIA RS-232C/ITU V.24 Connectors BL models: One DB-25 RS-232C connector; three RJ11 for phone line, dial-up and leased line; power. BLK models: One DB-25 RS-232C connector;...

  • Page 16: Power

    MultiModemBL User Guide Power Power is supplied through an AC power transformer terminated with a standard two-prong plug. The transformer supplies low voltage AC to the modem, and plugs into any conventional 115 volt AC, 60 Hz, two-prong power outlet (240 volts AC, 50Hz, .3 Amp for International modems). The power transformer supplied with the modem is the only one that should be used.

  • Page 17: Controls On Pc Board

    Chapter 1 - Introduction and Description (24.0) 24,000 bps. (2834 models only). This LED is lit when the modem is connected at 24,000 bps. Note: if the modem falls back to 21.6K bps while in V.34 mode, both the 24.0 and 19.2 LEDs light. (19.2) 19,200 bps.
  • Page 18 MultiModemBL User Guide...

  • Page 19: Chapter 2 - Installation And Connection

    Chapter 2 - Installation and Connection...

  • Page 20: What Is In Your Modem Package

    MultiModemBL User Guide What is in Your Modem Package? Your MultiModem is made up of many components. Make sure you have them all before trying to operate your modem. Figure 2-1. Unpacking (MT2834BL shown) Your package should include: • MT2834BL, MT1932BL or MT1432BL data/fax modem •...

  • Page 21: Installation

    Installation The installation of the modem consists of making the physical connections necessary to render the modem functional with your computer. This includes making the proper serial, phone line, and power connections. Unless otherwise noted, these instructions apply to all models of the BL series. 2.2.1 Safety Warnings Never install telephone wiring during a lightning storm.
  • Page 22 MultiModemBL User Guide PHONE PSTN Figure 2-2. MultiModemBL/BLI Connections Attach the EIA RS-232C connector on the modem to the serial port on your computer or terminal with an RS-232 (or V.24) cable (you supply). Refer to Figure 2-2. To connect a telephone set to the modem (optional) plug one end of an RJ-11 phone cord into the PHONE connector on the modem, and plug the other end into your telephone.

  • Page 23: Cabling Procedure (Mt1432Blk And Mt2834Blk)

    2.2.4 Cabling Procedure (MT1432BLK and MT2834BLK) Step Procedure Verify that the settings for DIP-Switch #5 and DIP-Switch #10 match those of your system configuration. The 16-position DIP-Switch (numbered 1-16) is accessible through a cut-out on the right side (as the LEDs are facing you) of the modem chassis. For a full description of all DIP-Switch Settings, refer to Chapter DIP-Switch...

  • Page 24: Loading Trio Datafax Software

    MultiModemBL User Guide Loading Trio DataFAX Software The following procedure will guide you through the installation of Trio DataFAX software. The procedure does not provide every screen or option in the process. The installation utility provides on- screen instructions for those elements that are not covered in this procedure. If you encounter problems during installation, refer to the Release Notes included on the Trio CD.
  • Page 25 Click Yes to read the Release Notes. when you are finished, close the release notes dialog and the Trio Setup dialog is displayed. 10 Click Complete Installation and the installation introduction is presented. 11 Click Next Dialog and follow the on-screen instructions to load the software. Once the software has finished loading, the following dialog is displayed: 12 Choose Manual Selection of Modem and Ports, then click Next Dialog.

  • Page 26: Is Your Modem Ready For Use

    MultiModemBL User Guide 15 Click Next Dialog. The Phone Numbers and Prefixes dialog is displayed. 16 Follow the on-screen instructions and when you are finished, click Next Dialog. The following dialog is displayed: 17 Click OK, Exit the Installation Program. The Trio Applications program group is displayed. Your Trio software is loaded.

  • Page 27: Chapter 3 - Software Configuration And Modem Basics

    Chapter 3 - Software Configuration and Modem Basics...

  • Page 28: Introduction

    MultiModemBL User Guide Introduction Chapter 2 guided you through the installation of Trio communications software. If you are using a different software package, there are some points you should take into consideration. Since your communications software configuration is affected by the capabilities of your computer, this chapter begins with a discussion of the limitations of some serial ports and how to identify them.

  • Page 29: The 16550 Uart And Windows 3.1

    3.2.2 The 16550 UART and Windows 3.1 Windows 3.1 may cause a loss of data when communicating at high speed, even with a 16550 UART installed. Because Windows is multitasking—it switches between several programs running at the same time—it can make the serial port wait briefly while Windows performs other tasks. Meanwhile, incoming data can be lost.

  • Page 30: Pc Initialization Strings

    MultiModemBL User Guide PC Initialization Strings We recommend the following initialization string for a MultiModem connected to a PC-compatible computer when sharing a line with a telephone: AT &F X4 S0=0 ^M This string resets the modem to the factory default settings, selects extended result codes with NO DIAL TONE and BUSY, and turns off auto-answer.

  • Page 31: Macintosh Initialization

    Macintosh Initialization Macintosh computers cannot use RTS/CTS hardware flow control without a serial cable wired for hardware control. The Macintosh 128 and 512 models cannot use RTS/CTS flow control at all. For those Macintoshes turn off the default RTS/CTS hardware flow control, turn on XON/XOFF flow control and pacing, and ignore DTR: AT &F X4 &E5 &E13 &D0 ^M For hardware flow control, use the following initialization string:...

  • Page 32: File Transfer Protocols

    MultiModemBL User Guide 3.6.3 File Transfer Protocols When you upload or download files with your modem, the host computer will ask which file transfer protocol you want to use. Most communications programs allow you to choose a default protocol. Your software’s documentation should list the ones it can use (not all communications programs support all protocols).

  • Page 33: Modem Basics

    Modem Basics You control your modem by issuing AT commands, setting S-Registers, and setting DIP-Switches. You can easily change the settings of your DIP-Switches, as they are located on the right side of your modem’s chassis. Right now your modem is set up for the most typical user application, that is, as a traditional modem set to make a dial-up call to a remote installation where the call is answered automatically;...
  • Page 34 MultiModemBL User Guide...

  • Page 35: Chapter 4 - Manual Dial And Automatic Answer

    Chapter 4 - Manual Dial and Automatic Answer...

  • Page 36: Introduction

    MultiModemBL User Guide Introduction We’ll assume that yours is the very common application, where you are using a modem to dial up a remote computer. The modem has been factory preset for originating a call to a compatible 33,600 bps modem (also set up for hardware flow control, V.42 error correction, V.42bis data compression and CTS/RTS operation).

  • Page 37: Automatic Leased Line Restoral Operation

    Automatic Leased Line Restoral Operation When the modem is in Dial Backup mode, it periodically checks the leased line to see if it's operational and tries to restore the leased line if possible. S-Register S18 determines how often restoral attempts occur. The default for S18 is 30 minutes, and can be set in one minute increments from 10 to 255 minutes.

  • Page 38: Dial-Up Operation

    MultiModemBL User Guide Dial-Up Operation When your modem is used as a dial-up modem (DIP-Switch #10 in the UP position), it can both originate and answer calls. To originate calls, you use the automatic dialing capability of the modem's Command mode. To do this, use the computer or terminal keyboard to enter a few command letters, followed by the phone number you wish to dial.

  • Page 39: Automatic Answering

    Automatic Answering The modem can be used as an automatic answering modem. No special modifications or settings are required other than making sure that the Auto-Answer select switch is set to Auto-answer enabled (DIP-Switch #5 UP). The modem, when in its idle state, is set for Originate mode frequencies. An incoming ring signal automatically switches the modem into Answer mode.

  • Page 40: 4.10 Handshaking Details

    MultiModemBL User Guide 4.10 Handshaking Details This section briefly explains what happens between two modems in a normal call. We are assuming that there are MultiModems at both the originating and at the answering end of the telephone line. (If other brands of modems are used with our modems, they will still communicate, but each manufacturer tends to use slightly different delay timings and sequences, and many of the brands vary in their LED designations.)

  • Page 41: Chapter 5 - Command Mode

    Chapter 5 - Command Mode...

  • Page 42: Introduction

    MultiModemBL User Guide Introduction AT commands are the means by which you, and your communications software, are able to communicate with and configure your modem. They enable you to establish, read, and modify parameters in addition to dialing. The following provides both a summary and a detailed explanation of the AT commands recognized by the MultiModem.

  • Page 43: Functional Modes

    Chapter 5 - Command Mode 5.1.2 Functional Modes The MultiModem can be in one of two functional states (see Figure 5-1). These are "Command mode" and "On-line mode". (There is also an in-between state, "Wait-for-Carrier", where the modem is out of Command mode but not yet really On-Line. When the modem is initially powered up, it is in Command mode and is ready to accept commands from your keyboard or software.

  • Page 44: Summary Of At Commands

    MultiModemBL User Guide Summary of AT Commands A wide variety of autodial operations and modem options can be controlled when the modem is in Command Mode. Remember, nearly all commands begin with AT. These commands are organized into several functional groups. An alphabetical summary of commands is provided in Appendix D.
  • Page 45 CONTROL RS232C &C Carrier Detect Control INTERFACE &D Data Terminal Ready Control &R Clear To Send Control &S Data Set Ready Control &RF CTS/RTS Control &SF DSR/CD Control CONFIGURE &E0 Normal Mode ERROR &E1 Auto-Reliable Mode CORRECTION &E2 Reliable Mode Negotiate V.42 Mode During Handshake MNP On/LAPM Off LAPM On/MNP Off...
  • Page 46 MultiModemBL User Guide EXECUTE LINE PROBE COMMANDS (2834 Series only) &RP READ AND ASSIGN S-REGISTER VALUES REMOTE #CBN Passwords for Callback Phone Numbers CONFIGURATION & CALLBACK SECURITY #RCBNxx TEST MODEM &T Format Line Probe Display (Graph or Table Format) Enable/Disable Reading Line Probe From DSP during handshake Display of Signal Strength Information Display Signal to Noise Ratio (SNR) Display of Noise Information...

  • Page 47: Result Codes

    Result Codes The Command mode provides you with several responses, or “Result Codes”, that can aid you in Command mode operation. These Result Codes are displayed on your video monitor. You can choose result codes that closely match those of the standard AT command set, or choose enhanced function result codes that have been used in Multi-Tech modems ("Multi-Tech"...
  • Page 48 MultiModemBL User Guide "Standard AT" Result Codes 2834 Series TERSE VERBOSE CONNECT RING NO CARRIER ERROR CONNECT 1200 NO DIALTONE BUSY NO ANSWER CONNECT 2400 1932 Series TERSE VERBOSE CONNECT RING NO CARRIER ERROR CONNECT 1200 BUSY 1432 Series TERSE VERBOSE CONNECT RING...

  • Page 49: Dialing Commands

    Chapter 5 - Command Mode Dialing Commands 5.4.1 Dialing Action Commands Dial Command D The letter D in a command causes the modem to dial the telephone number immediately following it. For example, if you enter ATD5551212 and hit RETURN, the modem dials the number 555-1212. The D command is also used in conjunction with a telephone set for manual dialing.

  • Page 50: Dial Modifier Commands

    MultiModemBL User Guide To activate DTR Dialing, enter AT$D1 and hit RETURN. The modem dials the phone number stored in the N0 location of memory when it receives a high DTR signal. DTR must remain high for the duration of the call, until disconnect. To deactivate DTR dialing, enter AT$D0 and hit RETURN. Note when using DTR Dialing in a synchronous application, be sure DIP-Switch #8 is in the UP position to disable V.25bis Command mode.
  • Page 51 Chapter 5 - Command Mode Automatic Pauses in Dialing , You can cause the modem to pause during the dialing sequence by entering a comma character where the pause is desired. This pause lasts two seconds. If a longer pause is desired, more than one comma may be entered consecutively, with each comma causing a two second pause.

  • Page 52: Quiet Answer

    MultiModemBL User Guide "Calling Card" Detect Tones $ The modem has the capability to detect AT&T "calling card" tones for the purpose of utilizing the user's calling card number to originate an on-line connection. An $ symbol placed in the dialing string causes the modem to pause and wait for an AT&T "calling card"...

  • Page 53: Phone Number Memory Commands

    5.4.3 Phone Number Memory Commands Storing Phone Numbers D...N A telephone number and command line of up to sixty characters may be stored in the modem’s number memory. As many as ten of these numbers may be stored. Each number will be given a name, using the codes N0, N1, N2 up to N9.

  • Page 54: Configuration And Default Storage Commands

    MultiModemBL User Guide 5.4.4 Configuration and Default Storage Commands Store Configuration & S-Register Parameters in Non-Volatile Memory &W The modem can store configuration parameters and S-Register values in its nonvolatile read/write Random Access Memory (RAM) memory. The &W command does this, which prevents any re- configuration from being lost on a power-down or Reset (ATZ) condition.
  • Page 55 Chapter 5 - Command Mode Unix UUCP Spoofing $SP The modem can be configured in a Unix environment that employs ACK flow control as a means of monitoring data integrity. The modem can do “UUCP spoofing”, where the modem is able to generate ACKs at the DTE interface.

  • Page 56: Command Response (Result Code) Commands

    MultiModemBL User Guide 5.4.5 Command Response (Result Code) Commands Echo Command Mode Characters E If the modem is connected to a full-duplex computer, it may be necessary for the modem to be configured to echo back characters entered while in the Command Mode in order for them to be displayed.
  • Page 57 Result Codes (Basic and Extended) and Call Progress Selection X The X Command is used to select one of two possible dialing methods (“dumb” or “smart”), and to select various response combinations related to these methods. You can choose to have certain responses suppressed, or whether or not you want speed indications along with the CONNECT responses.

  • Page 58: Phone Line Conditioning Commands

    MultiModemBL User Guide 5.4.6 Phone Line Conditioning Commands Guard Tones (Not Used in BLI or BLK Models) &G The &G command is used to control the presence or absence of guard tones from the transmitter when in Answer mode, at either 1200 or 2400 bps. Guard tones are used in Europe and other areas for the modem to function in the telephone systems.
  • Page 59 Fallback Modes When On-Line #F If line conditions deteriorate, the modem automatically drops its transmission speed (“fallback”). The #F command controls the different ways the modem falls back. During operation, if the error rate becomes too great, the modem performs a retrain. If after the retrain, the error rate is still too high for 33600 bps (19200 bps for 1932 models, 14400 bps for 1432 models) operation, the modem initiates a retrain at 4800 bps.
  • Page 60 MultiModemBL User Guide Auto Speed Detect #A The function of the #A command is to detect and select the operational data rates (the “starting” speeds) with which the modem uses for initial handshake and speed selection. Remember, this command does not control the originating data rate of the modem (that is done by the Modem Baud Rate command $MBn), but only the Answer mode “starting”...

  • Page 61: Rs-232C Interface Control Commands

    Chapter 5 - Command Mode 5.4.7 RS-232C Interface Control Commands Carrier Detect Control &C The &C command allows you to control the status of the Carrier Detect signal (CD-Pin 8) on the RS- 232C line. You have four choices. You can force the signal high, or allow it to act normally, or force the modem to reset when CD drops, or set it to stay high until the modem disconnects, go low momentarily, and then go high again.
  • Page 62 MultiModemBL User Guide Data Set Ready Control &S The &S command allows you to control the status of the Data Set Ready signal (DSR - pin 6) on the RS-232C interface. You have three choices. You can force the signal high, allow it to act normally, or set it to stay high until the modem disconnects, go low momentarily, and then go high again.

  • Page 63: Error Correction Commands

    Chapter 5 - Command Mode 5.4.8 Error Correction Commands You can use AT commands to place your modem one of three V.42 (error correction) modes of operation. These are the Normal, Auto-Reliable, and Reliable modes. Normal Mode &E0 In Normal mode of operation, the modem’s V.42 error correction capabilities are disabled, and the modem functions as a non-error-correcting modem.
  • Page 64 MultiModemBL User Guide V.42 Mode Select #L The V.42 standard implements both MNP Class 3 & 4 and LAP-M error correction methods. The V.42 Mode Select command (#L) selects which type of error correction (MNP or LAP-M) your modem uses for transmissions. The various #L command options are as follows.
  • Page 65 Enable/Disable Auto Reliable Fallback Character $F In Auto-Reliable mode, the modem is given four seconds to establish a Reliable connection. If a single CARRIAGE RETURN is received from the remote modem during this four second period, the Auto-Reliable modem assumes that the remote modem is not in Reliable mode and drops to Normal (non-error correcting) mode.

  • Page 66: Flow Control Commands

    MultiModemBL User Guide 5.4.9 Flow Control Commands Flow control refers to the techniques used by computer devices to stop and restart the flow of data to and from each other. Flow control is necessary so that a device does not receive more data than it can handle.
  • Page 67 Xon/Xoff Pass-Through &E7 So far, you have had three choices to make regarding pacing: 1. You can set the modem to respond to Xon/Xoff pacing. 2. You can set the modem to respond to RTS pacing. 3. You can set the modem to ignore pacing completely. Well, we’re not done with pacing yet.
  • Page 68 MultiModemBL User Guide Normal Mode Modem Flow Control On &E11 When two MultiModems are connected in Normal mode (not using error correction), Xon/Xoff can be used to control the flow of data between the modems. Flow Control can be turned on or off with the Normal Mode Modem Flow Control commands.

  • Page 69: Compression, Error Correction, Flow Control, Pass-Through And Pacing Commands

    5.4.10 Compression, Error Correction, Flow Control, Pass- Through and Pacing Commands The modem has a variety of commands to control its error correction and data compression options. These additional commands are listed below. (Remember to precede each command with the AT characters.) Normal/Auto-Reliable/Reliable Mode Commands: &E0 = Normal Mode...

  • Page 70: Speed Conversion Commands

    MultiModemBL User Guide 5.4.11 Speed Conversion Commands Speed conversion is a necessary part of data compression since data must be presented to the modem faster than it can handle data, if data compression is to be effective. Speed conversion allows the modem to communicate at one speed over the phone line, and at another speed at the RS-232C interface.
  • Page 71 1932 Series: AT$MB75 CCITT V.23 AT$MB300 300 bps AT$MB1200 1200 bps AT$MB2400 2400 bps AT$MB4800 4800 bps AT$MB9600 9600 bps AT$MB14400 14400 bps AT$MB19200 19200 bps The factory default is 19200 bps. 1432 Series: AT$MB75 CCITT V.23 AT$MB300 300 bps AT$MB1200 1200 bps AT$MB2400...
  • Page 72 MultiModemBL User Guide Serial Port Baud Rate $SB The $SB command presets the speed of the modem’s serial (RS-232C) port, in both Originate and Answer modes. Speed conversion allows you to set this serial port baud rate at a fixed speed of up to 115,200 bps for 1932 and 2834 models, and 57600 bps for 1432 models, regardless of the modem’s transmission speed setting.

  • Page 73: Immediate Action Commands

    5.4.12 Immediate Action Commands Help Screens $H The Help command is designed to give you short explanations on how to use each modem command. The Help command can be quite useful if your manual is not handy and you are in the middle of a communications session.
  • Page 74 MultiModemBL User Guide Listing On-Line Diagnostics L8 The L8 command displays the current on-line CONNECT status of the modem. This display can be printed and used as a modem status report or as diagnostic information (such as when calling Tech Support).

  • Page 75: Line Probe Commands (2834 Series Only)

    Force Answer Mode A You can force the modem into Answer mode with the modem’s A command. Entering ATA when in Command mode immediately brings your modem off-hook, out of Command mode and into On-Line Answer mode, and causes it to transmit its carrier signal over the phone line. If no responding carrier tone is received by your modem within forty-five seconds (or some other time as determined by S-Register S7), your modem stops transmitting its tone, hangs up, and goes back into Command mode.
  • Page 76 MultiModemBL User Guide...

  • Page 77: Chapter 6 - S-Registers

    Chapter 6 - S-Registers...

  • Page 78: Introduction

    MultiModemBL User Guide Introduction Certain Command Mode configurations are stored in memory registers called, S-Registers. The S command is used to assign a value to, and to read the current value of an S-Register. To assign a value to an S-Register, enter the letter S, followed by the S-Register number and an equals sign (=), and then a decimal response to the message “ENTER THE NEW VALUE IN DECIMAL FORMAT”.
  • Page 79 Line Feed Character Unit: ASCII Character Range: 0-127 Default: 10 (^J) Description: S4 defines the character recognized as Line Feed. S3 may be set for any ASCII character. Backspace Character Unit: ASCII Character Range: 0-127 Default: 8 (^H) Description: S5 defines the character recognized as BACKSPACE. S5 may be set for any ASCII character.
  • Page 80 MultiModemBL User Guide Carrier Detect Response Time Unit: 100 mSec. Range: 1-255 Default: Description: S9 sets the time delay between when the modem first detects a valid incoming carrier signal and when the modem turns on its Carrier Detect circuit. The default setting is 600 milliseconds, or six units of 100 mSec each (Decimal 6).
  • Page 81 Callback Time Delay Unit: Seconds Range: 10-255 Default: Description: S15 defines the time delay between Callback attempts after initial passwords have been exchanged between modems. Refer to information. Callback Attempts Unit: 1 Attempt Range: 1-255, 1-2*** Default: 4, 2*** Description: S16 defines the number of attempts allowed after initial passwords have been exchanged between modems.
  • Page 82 MultiModemBL User Guide PBX/CBX Disconnect Drop Time for DSR/CTS/CD Unit: 50 mSec. Range: 0-255 Default: Description: Some PBX and CBX phone systems require the modem’s DSR, CTS, and/or CD signal(s) to behave in a certain manner when calls are disconnected. The modem’s &R, &S, and &C commands cause the modem to drop these signal(s) for a specified time period upon disconnect, and then bring the signal(s) up again.
  • Page 83 Inactivity Timer Unit: 1 min. Range: 0-255 Default: Description: S30 causes the modem to disconnect if no data is transmitted or received for a specified time. This timer runs during both Reliable and Normal error correction connections. The timer restarts any time a data character is passed through the serial port (either sent or received).
  • Page 84 MultiModemBL User Guide Program V.34bis Connect Speeds (2834 Series only) Unit: Range: 33, 31, 28, 26, 24, 21,19,16,14,12, 96 and 48 Default: Description: Defines which speed modem connects within the scope of Enhanced V.34 mode (e.g., S48 = 26 means maximum connect speed is 26.4K). This register compensates for line conditions that have trouble supporting higher Enhanced V.34 speeds (e.g., 33.6K, 31.2K, 28.8K, 26.4K, 24K...).

  • Page 85: Reading And Assigning S-Register Values

    Reading and Assigning S-Register Values The S command is used to assign a value to, and to read the current value of, an S-Register. To read an S-Register value, enter the letter S followed by the S-register number and a question mark (?), then hit RETURN.

  • Page 86: At Command And S-Register Summary

    MultiModemBL User Guide AT Command and S-Register Summary The vast majority of installations are similar, with the modem being used to dial up a remote installation where the call is automatically answered. Your modem has a default configuration to dial another modem that supports error correction, data compression and flow control.

  • Page 87: Chapter 7 - Callback Security And Remote Configuration

    Chapter 7 - Callback Security and Remote Configuration...

  • Page 88: Introduction

    MultiModemBL User Guide Introduction This chapter describes how the MultiModem’s Callback and Remote Configuration features operate. These features use a multilevel security system, which involves the use of LOGIN Passwords, Setup Passwords and Remote Escape Characters. The primary level security code is the modem’s LOGIN Password. Once this password is entered, other passwords can be used.

  • Page 89: Remote Configuration Description

    Remote Configuration Description The Remote Configuration feature is a network management tool that allows you to configure modems remotely. This means you could configure modems anywhere in your network from one location without having to visit the sites or rely on remote users to follow your instructions. With Remote Configuration, which is protected by two level security, you can download new parameters, program new V.42 capabilities and implement new features.
  • Page 90 MultiModemBL User Guide To turn your modem's Callback Security feature on and off: 7. If you want Callback Security with both remote and local password security, enter AT#DB1 and hit RETURN. You must turn on Callback Security to be able to enter dial back phone numbers. 8.
  • Page 91 The + and/or - characters entered before the phone number are optional. The + (Deposit Number) code allows a caller to enter the number he or she wishes the Callback modem to call back when the caller uses a particular password (Step 3 of Table 7-3). The - character enables direct entry when the caller uses that correct password (Step 3 of Table 7-3) without the Callback modem having to return the call.

  • Page 92: Remote Configuration Procedures

    MultiModemBL User Guide 7.3.2 Remote Configuration Procedures The procedures for using the Remote Configuration features are the same whether or not a call originates from the remote modem. Once the modem is on-line, perform the procedures in Table 7-4. Table 7-4 Remote Configuration Operation Procedures Step Procedure 1.

  • Page 93: Remote Configuration And Callback Security At Commands

    Remote Configuration and Callback Security AT Commands The following AT commands are used with Remote Configuration and Callback Security features. Assign Passwords for Callback Phone Numbers When you have callback security enabled for the modem, anyone trying to connect with the modem will be required to furnish a password.
  • Page 94 MultiModemBL User Guide Erase Callback Password This command erases the single callback password specified by xx (0 through 29). Erase Callback Phone Number #RDNxx This command erases the single phone number specified by xx (0 through 29). #RCBNxx...

  • Page 95: Remote Configuration/Callback Security S-Registers

    Remote Configuration/Callback Security S-Registers The following S-Registers are used with Remote Configuration and Callback Security features. Remote Configuration Character (S13) S13 defines the modem’s remote configuration escape character. When the S13 character is entered three consecutive times from a remotely connected site, your modem responds to it with its Remote Configuration procedure.
  • Page 96 MultiModemBL User Guide...

  • Page 97: Chapter 8 - Modem Testing

    Chapter 8 - Modem Testing...

  • Page 98: Introduction

    MultiModemBL User Guide Introduction Each time you power up the MultiModem, it performs an automatic self- test to ensure proper operation. The modem also has four diagnostic test features: Local Analog Loopback, Digital Loopback (remote/automatic), Digital Loopback (local/manual) and a modem Back-to-Back test. A loopback test involves entering data from your PC and looping that data through the circuits of your modem and/or a remote modem.

  • Page 99: Local Analog Loopback Test/V.54 Loop 3

    Local Analog Loopback Test/V.54 Loop 3 In this test, data from your computer or terminal is sent to your modem's transmitter, converted into analog form, looped back to the receiver, converted into digital form and then received back at your monitor for verification.

  • Page 100: Digital Loopback Test/V.54 Loop 2 (Local/Manual)

    MultiModemBL User Guide Digital Loopback Test/V.54 Loop 2 (Local/Manual) In this test, your modem must be On-Line with another modem that can respond to a request for Digital Loopback, such as another MultiModem. The Digital Loopback Test is an on-line test that loops data sent from one modem across the phone line to another modem, then back to the first modem.

  • Page 101: Digital Loopback Test/V.54 Loop 2 (Remote/Automatic)

    Digital Loopback Test/V.54 Loop 2 (Remote/Automatic) In this test, your modem must be On-line with another modem set up to respond to a request for Digital Loopback, such as another MultiModem. With the MultiModem, this ability to respond is controlled by the &T command. AT&T4 enables the response to Digital Loopback Test (remote/ automatic).

  • Page 102: Back-To-Back Test

    MultiModemBL User Guide Back-to-Back Test This test lets you connect two MultiModems with an RJ-11 cable to verify proper operation. Using a modem that is known to be operational, you can test a second modem that is suspect. 1. Plug the modular ends of an RJ-11 cable into both MultiModem’s LEASE jack connectors. 2.

  • Page 103: Synchronous Mode Testing

    Synchronous Mode Testing The following tests must be run with your modem in Synchronous mode (DIP Switch #12 in the Up (OPEN) position), DIP Switch #9 controls the modem’s Synchronous mode testing function. (Refer to Chapter 9 for DIP Switch information.) The test procedures for Synchronous mode are different from those for Asynchronous mode.

  • Page 104: Digital Loopback Test (Local/Manual) (Synchronous Mode)

    MultiModemBL User Guide Digital Loopback Test (Local/Manual) (Synchronous Mode) This test must be run when you have a data connection with another modem. If a Local Analog Loopback Test resulted in errors, and this test passes without errors, then the problem exists in your computer-to-modem connection.

  • Page 105: Digital Loopback Test (Remote/Automatic) (Synchronous Mode)

    Digital Loopback Test (Remote/Automatic) (Synchronous Mode) This test must be run when you have a data connection with another modem. In this test, data is passed to the remote modem and is looped back to the local modem (as if an ATU2 command was issued in Asynchronous test mode), as shown in Figure 8-7.
  • Page 106 MultiModemBL User Guide...

  • Page 107: Chapter 9 - Dip-Switch Settings

    Chapter 9 - DIP-Switch Settings...

  • Page 108: Introduction

    MultiModemBL User Guide Introduction There are several DIP-Switch options on the modem’s printed circuit (PC) board. The DIP-Switches are accessible through a cut-out on the side of the modem. This chapter explains the modem’s printed-circuit board options. Sixteen DIP-Switch settings and the modem's speaker volume control are explained in detail, including all default settings.

  • Page 109: Dip-Switch Option Settings

    DIP-Switch Option Settings Switch #1 Forced DTR -- "DTR" (Asynchronous/Synchronous Mode/Leased Line/Dial-Up) The modem must have a high DTR signal in order to operate. DTR is provided to the modem by the terminal or computer to which it is attached, through pin 20 of the RS-232C/V.24 interface. If your terminal or computer is not providing DTR to the modem, you can force the DTR signal high with DIP- Switch #1.
  • Page 110 MultiModemBL User Guide *Switch #3 dB Transmission Levels (Asynchronous/Synchronous Mode/Leased Line) 2834 Series: DIP-Switch #3 adjusts dB transmission levels required by some phone carriers. Place DIP-Switch #3 in the DOWN position to enable -9 dB transmission. Place DIP-Switch #3 in the UP position to enable -15 dB transmission.
  • Page 111 Switch #5 Enable/Disable Auto-Answer - "Ans" (Asynchronous Mode/Synchronous Mode/Dial-Up) In some originate-only applications, you may wish to disable the modem’s automatic answering capabilities. This may be true if you have a telephone set attached to a modem and wish to receive voice calls that you yourself would answer instead of the modem.
  • Page 112 MultiModemBL User Guide Switch #7 Request To Send Forced - "RTS" (Asynchronous/Synchronous Mode/Leased Line/Dial-Up) If your computer or terminal uses RTS-CTS protocol (typically used in some synchronous applications, but also if using hardware pacing for V.42 error correction or speed conversion), you may want to set RTS to function independently of CTS (DIP-Switch #7 UP).
  • Page 113 Switch #11 "AT" Responses/Multi-Tech Responses (Asynchronous Mode/Leased line/Dial-Up) In Asynchronous mode, you can set the modem to respond with Result Codes according to the "Multi-Tech" command response set (Switch #11 in the DOWN position), or to "AT" command response set (Switch #11 in the UP position). The &Q command performs the same function (choosing AT or Multi-Tech Result Codes), and is explained further in "AT"...

  • Page 114: Speaker Volume Control

    MultiModemBL User Guide 1932 Series: 19200 bps Operation 14400 bps Operation 9600 bps Operation 2400 bps Operation Factory Default Setting = 1432 Series: 14400 bps Operation 9600 bps Operation 4800 bps Operation 2400 bps Operation Factory Default Setting = Switch #15 Carrier Detect/DSR Forcing -- "DSR"...

  • Page 115: Recording Option Configurations

    Recording Option Configurations This section lets you record any changes you may have made to the DIP-Switch settings. Circle the appropriate setting and record the effect for future reference. DIP-Switches Switch Function Force DTR/DTR from Interface* Flow Control &E4*/&E5 (Async/Dial-Up/Leased Line) SDLC*/BSC (Sync) Result Codes Enable*/Disable (Async/Dial-up)
  • Page 116 MultiModemBL User Guide DIP Switches #13-14 Note: The modem baud rate command ($MBn) overrides the setting of these speed selection switches (DIP switches #13 and #14). 2834 Series: SWITCH CONDITION #13/#14 UP/UP* #13/#14 DOWN/UP #13/#14 UP/DOWN #13/#14 DOWN/DOWN 9600 bps Operation 1932 Series: SWITCH CONDITION...

  • Page 117: Chapter 10 - Warranty, Service And Tech Support

    Chapter 10 - Warranty, Service and Tech Support...

  • Page 118: 10.1 Introduction

    CompuServe/Internet forums and information on Multi-Tech's Fax-Back Service. 10.2 Limited Warranty Multi-Tech Systems, Inc. (“MTS”) warrants that its products will be free from defects in material or workmanship for a period of five years from the date of purchase, or if proof of purchase is not provided, five years from date of shipment.

  • Page 119: 10.3 Tech Support

    10.4 Service If your tech support specialist decides that service is required, modems may be sent (freight prepaid) to our factory. Return shipping charges will be paid by Multi-Tech Systems (within North America). Include the following with your modem: •...

  • Page 120: 10.5 The Multi-Tech Bbs

    MultiModemBL User Guide 10.5 The Multi-Tech BBS For customers who do not have Internet access, Multi-Tech maintains a bulletin board system (BBS) that mirrors its FTP site. Information available from the BBS includes new product information, product upgrade files, and problem-solving tips. The phone number for the Multi-Tech BBS is (800) 392-2432 (USA and Canada) or (612) 785-3702 (international and local).

  • Page 121: Upgrading The Multimodem

    10.5.1 Upgrading the MultiModem The MultiModem has a Flash PROM which contains firmware code for the hardware and DSP code for the digital signal processor chips. At various times, Multi-Tech may add enhancements and/or fixes to the firmware. The flash technology used in the MultiModem lets you load these upgrades into the PROM or DSP chips through the modem's serial port.

  • Page 122: 10.8 About Ordering Accessories

    MultiModemBL User Guide 10.8 About Ordering Accessories SupplyNet, Inc. can supply you with replacement transformers, cables and connectors for select Multi-Tech products. You can place an order with SupplyNet via mail, phone, fax or the Internet at: Mail: SupplyNet, Inc. 614 Corporate Way Valley Cottage, NY 10989 Phone:...

  • Page 123: Appendixes

    Appendixes...

  • Page 124: Appendix A - Troubleshooting

    MultiModemBL User Guide Appendix A - Troubleshooting Your modem was thoroughly tested at the factory before it was shipped. If you are unable to make a successful connection or if you experience data loss or garbled characters during your connection, it is possible that the modem is defective.
  • Page 125 • If you don’t get an OK, the problem may still be in the communications software. Make sure you have done whatever is necessary in your software to make a port connection. Not all communications programs connect to the COM port automatically. Some connect when the software loads and remain connected until the program terminates.

  • Page 126: The Modem Dials But Cannot Make A Connection

    MultiModemBL User Guide The Modem Dials But Cannot Make a Connection There can be several reasons the modem fails to make a connection. Possibilities include • lack of a physical connection to the telephone line. • a wrong dial tone. •...
  • Page 127 The Modem Disconnects While On-line • If you have call waiting on the same phone line as your modem, it may interrupt your connection when someone tries to call you. If you have call waiting, disable it before each call. In most telephone areas, you can disable call waiting by preceding the telephone number with *70 (check with your local telephone company).
  • Page 128 MultiModemBL User Guide I Am Losing Data • If you are using data compression and a high speed serial port, set the serial port baud rate to four times the data rate. • Your UART may not be reliable at serial port speeds over 9600 bps or 19,200 bps. Turn off data compression, reset your serial port speed to a lower rate, or replace your serial port with a faster one.

  • Page 129: Appendix B - Ascii Character Code/Hex/Decimal Conversion Chart

    Appendix B - ASCII Character Code/Hex/Decimal Conversion Chart CTRL CODE HEX DEC CODE HEX DEC CODE HEX DEC CODE HEX DEC @ NUL W ETB — US Null, or all zeros Start of Header Start of Text End of Text End of Transmission Acknowledge Bell or Alarm...

  • Page 130: Appendix C - Dial Pulse And Tone-Dial Frequencies

    MultiModemBL User Guide Appendix C - Dial Pulse and Tone-Dial Frequencies Dial Pulses Closed Open In the example above, the digit 2 is pulse dialed, followed by the digit 1. Each pulse consists of an A mSec. open and a B mSec. closed, where A will be either 60 or 67 mSec and B will be either 40 or 33 mSec., for a total of 100 mSec.

  • Page 131: Appendix D - Command Summary

    Appendix D - Command Summary Command Values RETURN ***A: n = 0 or 1 n = 0 thru 3 * Factory Default Setting *** Not applicable in BLK models Appendix D - AT Command Summary Description Attention Code that precedes most command strings except A/, A: and Escape Codes.
  • Page 132 MultiModemBL User Guide Command Values ***Bn n = 0 or 1 &Bn n = 0 or 1 &BSn n = 0 or 1 $BAn n = 0 or 1 &Cn n = 0,1,2,4 &CDn n = 0 or 1 s = phone # DsNd s = phone # &Dn...
  • Page 133 Command Values &En n = 0 thru 15 $EBn n = 0 or 1 n=0 thru 5 n = 0 thru 2 &Fn n = 0, 8 or 9 $FCn n = 0 or 1 n = 0 or 1 ***&Gn n = 0, 1 or 2 n = 0 or 1...
  • Page 134 MultiModemBL User Guide Command Values n = 1 thru 3 n = 0,1or 2 I9 (2834 Series only) Read Only n = 0 thru 3 n = 0 thru 3 $MBn n = speed * Factory Default Setting Description $H1 brings up Help Screen #1. $H2 brings up Help Screen #2.
  • Page 135 Command Values &Mn n = 0 or 1 d = 0 thru 9 NdNe d = 0 thru 9 e = any other number 0 thru 9 ***&Pn n = 0 or 1 n = 0, 1 or 2 &Qn n = 0 or 1 n = 0 or 1 &Rn...
  • Page 136 MultiModemBL User Guide Command Values r = 0-11, 13, 15-19, 24-26, 30, 32 or 34... $SBn n = speed &SFn n = 0 or 1 &Sn n = 0, 1 or 2 $SPn n = 0 or 1 &Tn n = 4 or 5 n = 0 or 1 n = 0, 1, 2, or 3 $VDn...
  • Page 137 Command Values n = 0 or 1 &Wn n = 0 or 1 n = 0,1,2,3 or 4 n= 0 or 1 n = 0 or 1 In Dial Command In Dial Command In Dial Command In Dial Command +++AT<CR> BREAK AT<CR>...
  • Page 138 MultiModemBL User Guide Callback Security/Remote Configuration Command Summary Command #DBn #CBNyyxxxxxx + - Dxxxxxx???Nxx #RCBNxx #RDNxx Description #DB0 disables Callback Security and answering Yes to the prompt turns off Callback Security and erases stored phone numbers and passwords. Answering No to the prompt aborts the command. #DB1 activates remote and local password security.
  • Page 139 Password Command Summary Command #Ixxxxxxxxxx #Syyyyyyyyyy V.25bis Commands Command CSPs CRNdd CRIdd;nn DIC or CIC Appendix D - AT Command Summary Description Login Password is any keyboard characters (x) (upper/lower case sensitive), minimum 6 and maximum 10 characters. The default Login Password is #IMULTI-TECH.

  • Page 140: Appendix E - Dip-Switch Summary

    MultiModemBL User Guide Appendix E - DIP-Switch Summary Asynchronous Mode DIP-Switch Condition Down Down #3** 2834 Series: Down* #3** 1932 and 1432 Series: Down* Down Down Down Down* Down* Down* Down Down* Down* *Factory Default Setting **Not applicable in BLK models Effect DTR dependent on interface DTR forced On at all times...
  • Page 141 Synchronous Mode DIP-Switch Condition Effect DTR Dependent On interface Down DTR forced On at all times SDLC Mode On Down BSC Mode On Command Mode Response Off Down* Command Mode Response On AS/400 Mode Off Down AS/400 Mode On Answer Mode On Down Originate Mode On Slave Clocking Off...
  • Page 142 MultiModemBL User Guide DIP Switches #13-14 Note: The modem baud rate command ($MBn) overrides the setting of these speed selection switches (DIP switches #13 and #14). 2834 Series: SWITCH CONDITION #13/#14 UP/UP* #13/#14 DOWN/UP #13/#14 UP/DOWN #13/#14 DOWN/DOWN 9600 bps Operation 1932 Series: SWITCH CONDITION...

  • Page 143: Appendix F - S-Register Summary

    Appendix F - S-Register Summary S-REGISTER UNIT 1 ring 1 ring ASCII ASCII ASCII ASCII 1 second 2-255 1 second 1-255 1 second 0-255 100 mSec 1-255 100 mSec 1-255 1 mSec ASCII 1 Attempt 1-255 10 mSec 0-2.5 30 min * Values for International and DOC units only.
  • Page 144 MultiModemBL User Guide S-REGISTER UNIT 50 mSec 0-255 100 mSec 0-255 min 0-255 100mSec 0-255 ASCII 1 second 0-255 1 second 0-255 * S48 * 2834 Series only RANGE DEFAULT DESCRIPTION Sets DSR/CTS/CD dropout time. Default (20) equals one second. Sets DTR dropout time.

  • Page 145: Appendix G - Result Code Summary

    Appendix G - Result Code Summary TERSE (Digit) VERBOSE (Words) CONNECT RING NO CARRIER ERROR CONNECT 1200 NO DIAL TONE BUSY NO ANSWER CONNECT 2400 CONNECT 4800 CONNECT 9600 CONNECT 14400 19** CONNECT 19200 21** CONNECT 21600 CONNECT 1275 CONNECT 24000 CONNECT 26400 CONNECT 28800 CONNECT 31200...
  • Page 146 MultiModemBL User Guide Note: If the modem is used in MNP Reliable mode, the following responses change: CONNECT RELIABLE CONNECT 1200 RELIABLE CONNECT 2400 RELIABLE CONNECT 4800 RELIABLE CONNECT 9600 RELIABLE CONNECT 14400 RELIABLE 19R** CONNECT 19200 RELIABLE 21R* CONNECT 21600 RELIABLE 24R* CONNECT 24000 RELIABLE 26R*...

  • Page 147: Appendix H - V.25Bis Operation

    Appendix H - V.25bis Operation Appendix H - V.25bis Operation Chapter 5 described a set of commands which let the modem dial, hang-up, and be configured for various applications. However, these commands, the AT command set, are only functional when the DTE transmits data asynchronously.
  • Page 148 MultiModemBL User Guide Another asynchronous mode concern is the problem of connecting at a different speed than the speed at which the serial port is set. If your modem port speed is different from the serial port speed, you must either: Enable speed conversion and have flow control on, or Enable connect responses (with the ATX1 command) and change the serial baud rate after receiving a connect message.
  • Page 149 V.25bis Mode AT Commands The following commands will either alter standard V.25bis behavior (so you must be careful in their use) or they are not allowed, as indicated. All other commands can be used in V.25bis operation. Not Allowed Not Allowed Not Allowed Not Allowed D...N...
  • Page 150 MultiModemBL User Guide V.25bis AT Commands The AT commands associated with V.25bis mode are described as follows. Note that one command enables and disables V.25bis mode and the rest are only operable in the V.25bis mode. Enable/Disable V.25bis Mode ($V) Command The function of the $V command is to select the V.25bis mode in asynchronous mode.
  • Page 151 Appendix H - V.25bis Operation Listing Delayed Phone Numbers (RLD) Command When a phone number is dialed by a CRN command and a connection is not made, the number is entered in the modem's V.25bis Delayed Number list along with the number of retry attempts. Any further dialing attempts will be delayed some amount of time (determined by the regulations of each country).
  • Page 152 MultiModemBL User Guide ITU V.25bis Country Specific Information Due to the flexibility of the V.25bis standard, each country may establish specific regulations governing the way operations are handled. The purpose of this document is to detail each country's specific regulations that affect operation of V.25bis in Multi-Tech modems. 1.
  • Page 153 4. France Command/Indication modification (none) Delay and Forbidden list behavior 2 min. delay after 1st call, 4 after 2nd, 6 after 3rd, etc. After 5 retries, the number is put on the forbidden list The number remains on the forbidden list forever Delayed and Forbidden Numbers lists are checked when dialing in AT command mode.

  • Page 154: Appendix I - Multimodembl Cables

    MultiModemBL User Guide Appendix I - MultiModemBL Cables These cables connect your modem to your terminal or computer’s serial port. Figure I-1. RS232 Cable (IBM PC) Figure I-2. Two Wire Leased Line Connection Figure I-3. Four Wire Leased Line Connection...
  • Page 155 Appendix J - RS-232C Interface Specifications Figure I-4. MAC Cable...

  • Page 156: Appendix J - Rs-232C Interface Specifications

    MultiModemBL User Guide Appendix J - RS-232C Interface Specifications The modem's RS-232C interface circuits have been designed to meet the electrical specifications given in EIA (Electronic Industries Association) RS-232C standards. All signals generated by the modem are approximately 10 volts when measured across a load of 3000 ohms or greater. The receiving circuits of the modem will accept signals in the 3 to 25 volt range.
  • Page 157 Appendix J - RS-232C Interface Specifications Functional Description of RS-232C Signals: Transmitted Data - Pin 2, SD (BA) Direction: to modem Signals on this circuit are generated by the customer's terminal and transferred to the transmitter of the modem. A positive signal is a space (binary 0) and a negative signal is a mark (binary 1). The transmitting terminal should hold this line in the marking state when no data is being transmitted, including intervals between characters or words.
  • Page 158 MultiModemBL User Guide Test Voltage - Pin 9, XV Direction: from modem The XV lead has 330 ohms of resistance to +12 volts DC. This lead may be used to strap other signals high. For example, if the terminal does not supply a DTR (Data Terminal Ready) signal, Pin 9 may be jumpered to Pin 20 (DTR) on the RS-232 connector or in the cable to force DTR on.
  • Page 159 Appendix J - RS-232C Interface Specifications External Transmit Clock - Pin 24, XTC Direction: to modem Supplies the same function as transmit clock on Pin 15. Terminal Busy (Out of Service) - Pin 25, OOS Direction: to modem The Terminal Busy (OOS) circuit is not defined in the RS-232C standard, but is used by us and most manufacturers to make the phone lines busy to incoming phone calls.

  • Page 160: Appendix K - Regulatory Information

    MultiModemBL User Guide Appendix K - Regulatory Information Compliance with BABT Requirements Approved for connection to telecommunications system specified in the instructions for use subject to the conditions set out in them. Warning: Interconnection directly, or by way of other apparatus, of ports marked "SAFETY WARNING see instructions for use"...
  • Page 161 Appendix K - Regulatory Information All other apparatus connected to this modem and thereby connected directly or indirectly to the British Telecom public switched telephone network must be approved apparatus as defined in Section 22 of the British Telecommunications Act 1984. The Approval Label is as follows: The REN number for this apparatus = 1 Compliance with European Community Requirements...

  • Page 162: International Modem Restrictions

    MultiModemBL User Guide International Modem Restrictions Some dialing and answering defaults and restrictions may vary for international modems. Changing settings may cause a modem to become non-compliant with national telecom requirements in specific countries. Also note that some software packages may have features or lack restrictions that may cause the modem to become non-compliant.
  • Page 163 7. No repairs are to be made by you. Repairs are to be made only by Multi-Tech Systems or its licensees. Unauthorized repairs void registration and warranty.
  • Page 164 MultiModemBL User Guide Canadian Limitations Notice Notice: The ringer equivalence number (REN) assigned to each terminal device provides an indication of the maximum number of terminals allowed to be connected to a telephone interface. The termination of a interface may consist of any combination of devices subject only to the requirement that the sum of the ringer equivalence numbers of all the devices does not exceed 5.
  • Page 165 Index Symbols &E0 ... 32 &E1 ... 32 &E14 ... 32 &T command ... 101 16550 UART and Windows 3.1 ... 29 2 Wire/ 4 Wire Operation ... 114 2 Wire/4 Wire Operation ... 114 Abort Timer ... 79 Accessories ... 122 AGC Dynamic Range ...
  • Page 166 MultiModemBL User Guide Diagnostics ... 15 Dial (D) ... 49 Dial Phone Number Provided (CRN) Command150 Dial Pulse and Tone-Dial Frequencies ... 130 Dialing a Stored Number (N) ... 49 Dialing/On-Line/Answering ... 28 Digital Loopback Test ... 98, 112 Dimensions ... 15 DIP-Switch Summary ...
  • Page 167 MAC Cable ... 155 Macintosh computer ... 28, 31 Maximum Throughput Setting ... 111 Memory Nonvolatile (NVRAM) ... 30 MNP 5 ... 32, 127 Model Numbers ... 12 Modem Baud Rate ($MB) ... 70 Modem Cannot Connect When Answering ... 127 Modem Dials But Cannot Make a Connection ..
  • Page 168 MultiModemBL User Guide Speed Conversion ($BA) ... 70 Speed Switches ... 113 Storing Phone Numbers (D...N) ... 53 Summary ... 86 Synchronous Transmit Clock Select (&X) ... 55 Telephone line ... 126 Terminal Busy (Out of Service) ... 159 Terminal mode ... 124 Terminal/Computer Initiated Pacing (&E13) ...

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