1. Manuals
  2. Brands
  3. MultiModem Manuals
  4. Modem
  5. MT2834BA Series
  6. User manual

MultiModem MT2834BA Series User Manual

Intelligent data/fax modems
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
MT2834BA/MT2834BL Series
Intelligent Data/Fax Modems
User Guide

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the MT2834BA Series and is the answer not in the manual?

Questions and answers

Related Manuals for MultiModem MT2834BA Series

Summary of Contents for MultiModem MT2834BA Series

  • Page 1 MT2834BA/MT2834BL Series Intelligent Data/Fax Modems User Guide...
  • Page 2 5,463,616; 5,453,986; 5,452,289; 5,450,425; D353,598; 5,355,365; 5,309,562; 5,301,274. Other patents pending. Trademarks Trademarks of Multi-Tech Systems, Inc. are as follows: MultiModem , Multi-Tech and the Multi-Tech logo. All other brands and product names mentioned in this publication are trademarks or registered trademarks of their respective companies.

  • Page 3: Table Of Contents

    Contents Chapter 1 - Introduction and Description ................. 5 Introduction ............................6 How To Use This Manual ......................... 6 Modem Features ..........................7 1.3.1 MT2834BA/BL Series Features ....................8 Fax Features ........................... 8 Technical Specifications ........................9 Power .............................. 10 Modem LED Indicators ........................
  • Page 4 5.4.1 Dialing Action Commands ......................33 5.4.2 Dial Modifier Commands ......................34 5.4.3 Phone Number Memory Commands ..................37 5.4.4 Configuration and Default Storage Commands ................ 38 5.4.5 Command Response (Result Code) Commands ..............40 5.4.6 Phone Line Conditioning Commands ..................42 5.4.7 RS-232C Interface Control Commands ..................

  • Page 5: Chapter 1 - Introduction And Description

    Chapter 1 - Introduction and Description...

  • Page 6: Introduction

    Your MultiModem provides data communication at the following rates: 33,600 - 14,400 bps (Enhanced V.34 / V.32bis) The MultiModem also includes dial backup with automatic lease line restoration, adaptive protocol enhancing used in typical Unix® batch file transfers and support for IBM's AS/400 Windows environments.

  • Page 7: Modem Features

    Appendix F - Regulatory Information Modem Features The MultiModem BA/BL Series modem connections can be made on Public Switched Telephone Networks ( PSTNs ) and/or point-to-point 2-wire or 4-wire (BL only) telephone type circuits. Your modem offers interactive automatic dialing, as well as Command Mode option configuration.

  • Page 8: Mt2834Ba/Bl Series Features

    Chapter 1 - Introduction and Description 1.3.1 MT2834BA/BL Series Features Your MT2834BA/BL modem meets the proposed Enhanced V.34 ITU standard for data signalling rates as high as 33.6/31.2K bps in full duplex mode. Enhanced V.34 is an extension of V.32/V.32bis/ V34 standards, and supports and is compatible with those features, including EIA extended Automode;...

  • Page 9: Technical Specifications

    Chapter 1 - Introduction and Description Technical Specifications Your data/fax modem meets the specifications listed below: Tradename MultiModem IITM Model Numbers MT2834BA, MT2834BAI, MT2834BL, MT2834BLI Data Rates (modem) 33,600, 31,200, 28,800, 26,400, 24,000, 21,600, 19,200, 16,800, 14,400, 12,000, 9600, 7200, 4800, 2400, 1200, 0-300 bps...

  • Page 10: Power

    Chapter 1 - Introduction and Description Fax Modulations V.21CH2 FSK at 300 bps, V.27ter DPSK at 4800 and 2400 bps, V.29 QAM at 9600 and 7200 bps, V.17 TCM at 14400, 12000, 9600, and 7200 bps Transmit Level -11dBm (dial-up), -9 or -15 dBm (leased-line); dBm level selectable with DIP-Switch #3 in leased line setting Frequency Stability ±0.01%...

  • Page 11: Modem Led Indicators

    Chapter 1 - Introduction and Description Modem LED Indicators The MultiModem diagnostic LED indicators are shown in Figure 1-1 and Figure 1-2. Figure 1-1. MT2834BA LED Display Figure 1-2. MT2834BL LED Display (SD) Send (Transmit) Data . This LED blinks when data is being transmitted, on for a space, off for a mark.

  • Page 12: Controls On Pc Board

    Chapter 1 - Introduction and Description Controls on PC Board The MultiModem is designed on a single printed circuit (PC) board. This board contains one 16- position DIP-Switch (numbered 1-16). The DIP-Switches are accessible through a cut-out on the side of the modem.

  • Page 13: Chapter 2 - Installation And Connection

    Chapter 2 - Installation and Connection...

  • Page 14: What Is In Your Modem Package

    Chapter 2 - Installation and Connection 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. Your package should include: MT2834BA or MT2834BL data/fax modem...
  • Page 15 Chapter 2 - Installation and Connection 2. Verify that the ON/OFF switch at the rear of the modem to the OFF (Down) position. 3. For BA: Connect the modem to a dial-up line by attaching the RJ-11 telephone cord (provided with your unit) to the LINE connector on the modem and to a dial-up wall jack.

  • Page 16: Installing Phonetools, The Data Communications Software

    Chapter 2 - Installation and Connection Installing PhoneTools, the Data Communications Software Data communications software is designed to send and receive messages. Multi-Tech includes a data communications software program, PhoneTools, with your modem. However, the modem will work with any data communications software. To install PhoneTools, insert the MT2834BA/BL CD in you CD-ROM drive and click the PhoneTools icon.

  • Page 17: Chapter 3 - Software Configuration And Modem Basics

    Chapter 3 - Software Configuration and Modem Basics...

  • Page 18: Introduction

    RETURN key (<CR>) instead of adding ^M to the string. The following initialization string is for a MultiModem on a telephone line that functions solely as a DATA LINE : AT &F X4 S0= 2 ^M...

  • Page 19: Changing Default Parameters

    Chapter 3 - Software Configuration 3.3.1 Changing Default Parameters By default, the modem will answer after the first ring and try to communicate with a modem on the other end of the line. If you have one telephone line for voice, fax, and modem communications, the modem may attempt to answer all incoming calls, voice as well as data.

  • Page 20: Modem Basics

    Chapter 3 - Software Configuration 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 21: Chapter 4 - Manual Dial And Automatic Answer

    Chapter 4 - Manual Dial and Automatic Answer...

  • Page 22: Introduction

    Chapter 4 - Manual Dial and Automatic Answer 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.42 bis data compression and CTS/RTS operation).

  • Page 23: Automatic Leased Line Restoral Operation

    Dial Backup and Leased Line Restoral The dialing associated with the MultiModem, when in leased line with dial-back mode, involves placing a call from the originating modem due to a leased line failure. After a preset period of time (determined by S-Register S18), the modem automatically tries to restore the leased line.

  • Page 24: Dial-Up Operation

    Chapter 4 - Manual Dial and Automatic Answer 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.

  • Page 25: Automatic Answering

    Manual Answering We have shown that the modem can automatically answer incoming calls. The MultiModem can also answer manually, under your control. The most typical application involves you and another person, who, after carrying on a voice conversation, want to convert to data communications between your modems without having to hang up and dial again.

  • Page 26: 4.10 Handshaking Details

    Chapter 4 - Manual Dial and Automatic Answer 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 27: Chapter 5 - Command Mode

    Chapter 5 - Command Mode...

  • Page 28: Introduction

    5.1.2 Functional Modes The MultiModem can be in one of two functional states (see Figure 4-1). 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.

  • Page 29: Summary Of At Commands

    Chapter 5 - Command Mode Figure 5-1. Functional Modes 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.
  • Page 30 Chapter 5 - Command Mode STORE MODEM &F Load Factory Defaults CONFIGURATIONS &W Store Configuration & S-Register AND DEFAULTS Parameters Reset Modem Result Code Terse/Verbose UNIX/ "Spoofing” &M Synchronous/Asynchronous Mode Select &X Synchronous Transmit Clock Select CONFIGURE Result Codes Enable/Disable Response COMMAND &Q Result Code Selection...
  • Page 31 Chapter 5 - Command Mode CONFIGURE DATA &E14 Data Compression Disabled COMPRESSION &E15 Data Compression Enabled CONFIGURE SPEED $BA0 Speed Conversion On CONVERSION $BA1 Speed Conversion Off Set modem speed (e.g.,$MB14400) Set serial port speed (e.g.,$SB57600) EXECUTE Help IMMEDIATE Product Code Inquiry ACTION Windows 95 Autodetect Inquiry (2834 Series only) COMMANDS...

  • Page 32: Result Codes

    Chapter 5 - Command Mode 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 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 33: 5.4 Dialing Commands

    Chapter 5 - Command Mode 5.4 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 34: Dial Modifier Commands

    Chapter 5 - Command Mode 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.
  • Page 35 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 36 Chapter 5 - Command Mode "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 37: Phone Number Memory Commands

    Chapter 5 - Command Mode 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 38: Configuration And Default Storage Commands

    Chapter 5 - Command Mode 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 39 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 40: Command Response (Result Code) Commands

    Chapter 5 - Command Mode 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 41 Chapter 5 - Command Mode 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 42: Phone Line Conditioning Commands

    Chapter 5 - Command Mode 5.4.6 Phone Line Conditioning Commands Guard Tones (Not Used in BAI/BLI 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 43 Chapter 5 - Command Mode 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.

  • Page 44: 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 45 Chapter 5 - Command Mode 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 46: 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 47 Chapter 5 - Command Mode 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.
  • Page 48 Chapter 5 - Command Mode 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 49: Flow Control Commands

    Flow control is necessary so that a device does not receive more data than it can handle. In the case of the MultiModem, there is a need for flow control in both directions. As illustrated on the next page, flow control for data passing from your computer to the modem is called Modem-Initiated Flow Control and flow control for data passing from the modem to your computer is called Computer/Terminal-Initiated Pacing.
  • Page 50 Chapter 5 - Command Mode 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.
  • Page 51 Chapter 5 - Command Mode 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 52: Compression, Error Correction, Flow Control, Pass-Through And Pacing Commands

    Chapter 5 - Command Mode 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 53: Speed Conversion Commands

    In addition to data compression, another popular application for speed conversion involves an auto- answer MultiModem connected to a computer that does not have autobaud capability. This means that the computer must be set at a fixed baud rate, regardless of the baud rate that the modem is communicating over the phone line at.
  • Page 54 Chapter 5 - Command Mode 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 55: Immediate Action Commands

    Windows 95 system that your particular modem is a MT2834BA (orBL), 28,800 bps, fax Class 2 capable modem. With autodetect support in your MultiModem, your PC can automatically allocate resources and configure it and other devices. The MT2834BA implements autodetect capability in the form of a single .INF (Information) file that specifies AT Command mode and Result...
  • Page 56 Chapter 5 - Command Mode 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 57: Line Probe Commands

    Chapter 5 - Command Mode 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 58: Chapter 6 - S-Registers

    Chapter 6 - S-Registers...

  • Page 59: Introduction

    Chapter 6 - S-Registers 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 60 Chapter 6 - S-Registers 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.
  • Page 61 Chapter 6 - S-Registers 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 62 Chapter 6 - S-Registers 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. Callback Attempts Unit: 1 Attempt Range: 1-255 Default: Description: S16 defines the number of attempts allowed after initial passwords have been exchanged between modems.
  • Page 63 Chapter 6 - S-Registers 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 64 Chapter 6 - S-Registers 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.
  • Page 65 Chapter 6 - S-Registers Program V.34bis Connect Speeds 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 66: Reading And Assigning S-Register Values

    Chapter 6 - S-Registers 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 67: At Command And S-Register Summary

    Your modem has a default configuration to dial another modem that supports error correction, data compression and flow control. If the answering modem is not compatible, the MultiModem can match protocols, provided the protocols are industry standard (i.e., ITU or Bell) and not proprietary.

  • Page 68: Chapter 7 - Callback Security And Remote Configuration

    Chapter 7 - Callback Security and Remote Configuration...

  • Page 69: Introduction

    Chapter 7 - Callback Security and Remote Configuration 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.

  • Page 70: Remote Configuration Description

    Chapter 7 - Callback Security and Remote Configuration 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 71 Chapter 7 - Callback Security and Remote Configuration 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 72 Chapter 7 - Callback Security and Remote Configuration 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).

  • Page 73: Remote Configuration Procedures

    Chapter 7 - Callback Security and Remote Configuration 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 1.

  • Page 74: Remote Configuration And Callback Security At Commands

    Chapter 7 - Callback Security and Remote Configuration Remote Configuration and Callback Security AT Commands When you have callback security enabled for the modem, anyone trying to connect with the modem will be required to furnish a password. The #CBN command allows you to enter passwords for each of the 30 memory locations used for callback security.

  • Page 75: Remote Configuration/Callback Security S-Registers

    Chapter 7 - Callback Security and Remote Configuration 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 76: Chapter 8 - Dip-Switch Settings

    Chapter 8 - DIP-Switch Settings...

  • Page 77: Introduction

    Chapter 8 - Dip-Switch Settings 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 78: Dip-Switch Option Settings

    Chapter 8 - Dip-Switch 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 79 Chapter 8 - Dip-Switch Settings Switch #3 dB Transmission Levels (Asynchronous/Synchronous Mode/Leased Line) 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 80 Chapter 8 - Dip-Switch Settings Switch #5 Originate/Answer Mode (Asynchronous/Synchronous Mode/Leased Line) The modem functions in either Originate mode or Answer mode. Place DIP-Switch #5 in the DOWN position to enable Originate mode. Place DIP-Switch #5 in the UP position to enable Answer mode. Originate Mode Enabled Switch #5 DOWN Answer Mode Enabled...
  • Page 81 Chapter 8 - Dip-Switch Settings Switch #8 Enable/Disable Command Mode -- "Com" (Asynchronous/Synchronous Mode/Leased/Dial-Up) In some applications you may want to disable the modem's Command mode so that the modem does not recognize or react to AT or V.25 bis commands. This may be true in strictly auto-answer applications where no call origination is required.
  • Page 82 Chapter 8 - Dip-Switch Settings Switch #11 Internal/External Clocking (Synchronous Mode/Leased Line/Dial-Up) In Synchronous mode, the transmit clock can be supplied by the DTE on pin 24 of the RS-232C/V.24 interface by placing DIP-Switch #11 UP. Place DIP-Switch #11 in the DOWN position to enable DCE to control clocking (internal clock via pins 15 and 17 of the RS-232/V.24 interface).

  • Page 83: Speaker Volume Control

    Chapter 8 - Dip-Switch Settings Switch #16 (MT2834BA Only) (Reserved for Future Use) Switch #16 (MT2834BL Only) 2 Wire/4 Wire Operation (Asynchronous/Synchronous Mode) The modem works over either 2-wire or 4-wire leased lines. To select 4-wire operation, place Switch #16 DOWN (Default); and to select 2-wire operation, place Switch #16 UP. 2-Wire Leased Line Switch #16 UP 4-Wire Leased Line...

  • Page 84: Recording Option Configurations

    Chapter 8 - Dip-Switch Settings 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 Position Effect Force DTR/DTR from Interface* DTR Dependent on Interface DOWN DTR Forced On at All Times...
  • Page 85 Chapter 8 - Dip-Switch Settings DIP Switches #13-14 Note: The modem baud rate command ( $MBn ) overrides the setting of these speed selection switches (DIP switches #13 and #14). SWITCH CONDITION EFFECT #13/#14 UP/UP* 28.8 K bps Operation #13/#14 DOWN/UP 19.2 K bps Operation #13/#14...

  • Page 86: Chapter 9 - Warranty, Service And Tech Support

    Chapter 9 - Warranty, Service and Tech Support...

  • Page 87: Introduction

    Chapter 9 - Warranty, Service, and Technical Support Introduction This chapter starts out with statements about your modem's warranty and repair procedures. The next sections cover online warranty registration, replacement parts, and technical support. Multi-Tech Systems, Inc. Warranty & Repairs Policies Warranty Multi-Tech Systems, Inc., (hereafter “MTS”) warrants that its products will be free from defects in material or workmanship for a period of two, five, or ten years (depending on model) from date of...

  • Page 88: Online Warranty Registration

    Chapter 9 - Warranty, Service, and Technical Support Please direct your questions regarding technical matters, product configuration, verification that the product is defective, etc., to our Technical Support department at (800) 972-2439 or email tsupport@multitech.com. Please direct your questions regarding repair expediting, receiving, ship- ping, billing, etc., to our Repair Accounting department at (800) 328-9717 or (763) 717-5631, or email mtsrepair@multitech.com.

  • Page 89: Replacement Parts

    Chapter 9 - Warranty, Service, and Technical Support Replacement Parts SupplyNet, Inc., can supply you with replacement power supplies, cables and connectors for selected Multi-Tech products. You can place an order with SupplyNet via mail, phone, fax or the Internet at the following addresses: Mail: SupplyNet, Inc.

  • Page 90: Appendixes

    Appendixes...

  • Page 91: Appendix A - Upgrading Your Modem's Firmware

    Appendix A - Upgrading Your Modem’s Firmware Appendix A - Upgrading Your Modem’s Firmware Your modem is controlled by semi-permanent software, called firmware , which is stored in flash memory. Firmware is nonvolatile; that is, it remains stored in memory when the modem is turned off. However, it can be changed by either the manufacturer or the user as bugs are fixed or new features are added.
  • Page 92 6.xx firmware. Step 3: Download the Upgrade File If you are not already at the MultiModem’s Firmware page of the Multi-Tech Web site, follow the procedure in “Step 2: Identify the Current Firmware.” Download the upgrade file for your modem by clicking its name, and save the file in a temporary folder on your hard disk.
  • Page 93 Appendix A - Upgrading Your Modem’s Firmware Type AT&W1Z and press E to clear your stored parameters and reset your modem to factory NTER default. Close the terminal program. Step 6: Upgrade the Modem’s Firmware Before you begin the following procedure, read the README.TXT file extracted from the upgrade archive file.

  • Page 94: Appendix B - Troubleshooting

    Appendix B - Troubleshooting Appendix B - 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 95 Appendix B - Troubleshooting 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 96 Appendix B - Troubleshooting 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. a busy signal. a wrong number.
  • Page 97 Appendix B - Troubleshooting 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 98 Appendix B - Troubleshooting I Am Getting Garbage Characters on the Monitor Your computer and the remote computer may be set to different word lengths, stop bits, or parities. If you have connected at 8-N-1, try changing to 7-E-1, or vice-versa, using your communications software.

  • Page 99: Appendix C - At Command Summary

    Appendix C - AT Command Summary Appendix C - AT Command Summary Command Values Description Attention Code that precedes most command strings except A/, A: and Escape Codes. RETURN Pressing RETURN key executes most commands. This symbol placed in dialing string enables the modem to detect AT&T's "call card"...
  • Page 100 Appendix C - AT Command Summary Command Values Description D s N d s = phone # Store telephone number. To store, phone d = 0 thru 9 number ”s“ is entered and followed by N and then Directory Number “d.” &D n n = 0 thru 3 &D0 DTR is ignored...
  • Page 101 Appendix C - AT Command Summary &F n n = 0, 8 or 9 &F loads factory default values from ROM. &F8 reads factory default values and switch settings when &F is issued. &F9 reads parameters stored in non-volatile memory when &F is issued. $F n n = 0 or 1 $F0 means do not fall back to normal connect if CR...
  • Page 102 Appendix C - AT Command Summary $MB n n = speed $MB75 selects CCITT V.23 mode. $MB300 selects 300 bps on-line. $MB1200 selects 1200 bps on-line. $MB2400 selects 2400 bps on-line. $MB4800 selects 4800 bps on-line. $MB9600 selects 9600 bps on-line. $MB14400 selects 14400 bps on-line $MB19200 selects 19200 bps on-line $MB28800 selects 28800 bps on-line...
  • Page 103 Appendix C - AT Command Summary $SB n n = speed $SB300 selects 300 bps at serial port. $SB1200 selects 1200 bps at serial port. $SB2400 selects 2400 bps at serial port. $SB4800 selects 4800 bps at serial port. $SB9600 selects 9600 bps at serial port. $SB19200 selects 19,200 bps at serial port.
  • Page 104 Appendix C - AT Command Summary n = 0,1,2,3 or 4 X0 selects Basic Result Codes (w/o CONNECT 1200, CONNECT 2400). X1 selects Extended Result Codes (w/CONNECT 1200, CONNECT 2400). X2 selects Standard AT Command set with NO DIAL TONE. X3 selects Standard AT Command set with BUSY.
  • Page 105 Appendix C - AT Command Summary Callback Security/Remote Configuration Command Summary Command Description #DBn #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 106 Appendix C - AT Command Summary Password Command Summary Command Description #Ixxxxxxxxxx Login Password is any keyboard characters (x) (upper/lower case sensitive), minimum 6 and maximum 10 characters. The default Login Password is #IMULTI-TECH. #Syyyyyyyyyy Setup Password is any keyboard characters (y) (upper/lower case sensitive), minimum 6 and maximum 10 characters.

  • Page 107: Appendix D - V.25Bis Operation

    Appendix D - V.25bis Operation Appendix D - V.25bis Operation Chapter 4 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 108 Appendix D - V.25bis Operation V.25bis Set-Up and Initialization Before you operate your modem in the V.25 bis mode, you need to make sure it is set up properly (various RS-232 lines such as DSR and CTS act as specified in the V.25 bis standard). Setup involves proper DIP-Switch settings and soft-switches (software controlled conditions).
  • Page 109 Appendix D - V.25bis Operation V.25bis Responses (Result Codes) When in V.25 bis mode (the AT$V1 command executed), your modem provides you with several responses which can help you follow the progress of V.25 bis operations. These are similar to the Result Codes associated with AT Command mode operation.
  • Page 110 Appendix D - V.25bis Operation Dial Phone Number Provided (CRN) Command The CRN command permits the dialing of the phone number immediately following it (from the command line). It is similar to the D command, except that the number is first checked against the Delayed Number and Forbidden Number list.
  • Page 111 Appendix D - V.25bis Operation ITU V.25bis Country Specific Information Due to the flexibility of the V.25 bis 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.25 bis in Multi-Tech modems.
  • Page 112 Appendix D - V.25bis Operation 5. Belgium Command/Indication modification (none) Delay and Forbidden list behavior 1 min. delay between calls After 4 retries, the number is put on the forbidden list The number remains on the forbidden list for 1 hour after entry to forbidden list Delayed and Forbidden Numbers lists are checked when dialing in AT command mode.

  • Page 113: Appendix E - Multimodemba Cables

    Appendix E - MultiModemBA/BL Cables Appendix E - MultiModemBA/BL Cables These cables connect your modem to your terminal or computer’s serial port. Figure E-1. RS232 Cable (IBM PC) Figure E-2. Two Wire Leased Line Connection Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide...

  • Page 114: Multimodembl Cables

    Appendix E - MultiModemBA/BL Cables MultiModemBL Cables Figure E-3. RS232 Cable (IBM PC) Figure E-4. Two Wire Leased Line Connection Figure E-5. Four Wire Leased Line Connection Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide...

  • Page 115: Appendix F - Regulatory Information

    This equipment should not be used on party lines or coin lines. 10. If so required, this equipment is hearing-aid compatible. 11. Manufacturer: Multi-Tech Systems, Inc. Trade Name: MultiModem Model Number: MultiModemBA and MultiModemBL FCC Registration No: AU7USA-65363-MD-E and AU7USA-20673-MM-E Ringer Equivalence No: 0.5B and 0.3B...

  • Page 116: Canadian Limitations Notice

    Appendix F - Regulatory Information 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 on an 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 117: South African Notice

    Appendix F - Regulatory Information This equipment may not provide for the effective hand-over of a call to another device connected to the same line. Some parameters required for compliance with Telecom’s Telepermit requirements are dependent on the equipment (PC) associated with this device. The associated equipment shall be set to operate within the following limits for compliance with Telecom’s Specifications: For repeat calls to the same number: There shall be no more than 10 call attempts to the same number within any 30-minute period for any...

  • Page 118: Index

    Index Change SETUP Password (#S) ......74 Index Changing Break Time ......... 62 Cleardown at Disconnect ........43 COM ports COM2 ............. 19 Command Buffer ..........9 Symbols "Command mode" ..........28 2 Wire/ 4 Wire Operation ........83 Command string ..........18 2 Wire/4 Wire Operation ........
  • Page 119 Index Enable/Suppress Responses ......78 Erase Callback Password (#RCBNxx) ....74 Leased Line/Dial-Up Operation ......81 Erase Callback Phone Number (#RDNxx) ..74 Limited Warranty ..........10 Error Correction ............ 9 Line Feed Character ........... 60 Escape Code Character ........59 “Link Request”...
  • Page 120 Index Parity ..............18 Storing Phone Numbers (D...N) ......37 Parity Selection (#P) .......... 51 Summary ............67 Password Command Summary ...... 106 Synchronous Transmit Clock Select (&X) ..39 Pause Time for Comma ........60 PBX/CBX Disconnect Drop Time for DSR/CTS/CD63 PBX/CBX systems ..........

This manual is also suitable for:

Mt2834bl series

Table of Contents