User Guide
 Trademarks
User Guide
Record of Revisions Date Description
Patents
 Contents
 Index 117
Registers
 Introduction and Description
 Introduction
How To Use This Manual
 Modem Features
 Fax Features
1 MT2834BA/BL Series Features
 Technical Specifications
 Power
 MT2834BA LED Display
Modem LED Indicators
 Controls on PC Board
 Installation and Connection
 Installation Procedure
What Is in Your Modem Package?
Installation
Safety Warnings
 MultiModemBA Connections
 Is Your Modem Ready for Use?
Installing PhoneTools, the Data Communications Software
 Software Configuration and Modem Basics
 PC Initialization Strings
Configuring Your Software
Configuring Software for Your Modem
Software Configuration
 AT &F S0=0 &F9 &W0 CR
Changing Default Parameters
Configuring Software for Your Computer
Other Parameters
 Answer/Originate Voice/Data Toggle Switch
Modem Basics
Simple Operations
 Manual Dial and Automatic Answer
 Manual Dial and Automatic Answer
Dialing/On-Line/Answering
 Manual Dial Backup Call Termination
Dial Backup and Leased Line Restoral
Automatic Leased Line Restoral Operation
 Manual Call Origination
Dial-Up Operation
 Manual Answering
Automatic Answering
 Abort Timer
Handshaking Details
Call Termination
 Command Mode
 AT Command Editing
Command Mode
Functional Modes
 Functional Modes
Summary of AT Commands
 Store Modem
 Configure Data
 Result Codes
Multi-Tech Result Codes
Standard AT Result Codes
 Dialing Action Commands
Dialing Commands
 Set Pulse Dial Ratios &P
Dial Modifier Commands
Voice/Data Dialing $VD
Pulse or Tone Dial P T
 Long Space Disconnect Y
Return to Command Mode After Dial Command Execution
Reverse the Mode of Operation R
Automatic Pauses in Dialing
 Quiet Answer @
Calling Card Detect Tones $
 Listing Numbers Stored in Memory L
Phone Number Memory Commands
Storing Phone Numbers D...N
Number Linking NN
 Configuration and Default Storage Commands
Loading Factory Defaults &F
Modem Reset Z
 Async/Sync Mode Switching &M
Unix Uucp Spoofing $SP
Synchronous Transmit Clock Select &X
 Result Codes Multi-Tech or Standard AT &Q
Command Response Result Code Commands
Echo Command Mode Characters E
Result Codes Enable/Disable and No Response Answer Q
 Result Codes Basic and Extended and Call Progress Selection
 Bell/V.21 Tone
Phone Line Conditioning Commands
Enable/Disable Trelis Coded Modulation #T
Guard Tones Not Used in BAI/BLI Models &G
 Auto Speed Detect #A
Fallback Modes When On-Line #F
Enable/Disable Lowspeed Fast Connect $FC
Cleardown at Disconnect &CD
 CTS Control &R
7 RS-232C Interface Control Commands
Carrier Detect Control &C
Data Terminal Ready Control &D
 Data Set Ready Control &S
CTS/RTS Interaction Control &RF
DSR/CD Interaction Control &SF
 Reliable Mode &E2
Error Correction Commands
Normal Mode &E0
Auto-Reliable Mode &E1
 Auto-Reliable Buffering $A
Mode Select #L
 Enable/Disable Auto Reliable Fallback Character $F
Error Correction/300bps $E
Retransmit Count $R
 Flow Control Commands
Hardware Flow Control &E4
Xon/Xoff Flow Control &E5
 Xon/Xoff Pass-Through &E7
Send Xon/Xoff Characters #X
Hewlett-Packard ENQ/ACK Pacing &E9
 Parity Selection #P
Normal Mode Modem Flow Control On &E11
Terminal/Computer Initiated Pacing &E13
Maximum Block Size &BS
 Normal/Auto-Reliable/Reliable Mode Commands
Xon/Xoff Pass-Through Commands
Enq/Ack Pacing Commands
 Speed Conversion Commands
Speed Conversion $BA
Modem Baud Rate $MB
 Serial Port Baud Rate $SB
 Immediate Action Commands
 Off Hook H
Listing On-Line Diagnostics L8
 Line Probe Commands
Force Answer Mode a
Exiting Command Mode, Going Back On-Line O
 Registers
 Return Character
Number of Rings Until Modem Answers
Rings Which Have Occurred
Escape Code Character
 Wait Time for Dial Tone
Time for Carrier Abort Timer
Line Feed Character
Backspace Character
 S11 Tone Dialing Tone Spacing and Duration
S10 Carrier Loss Disconnect Delay Time
S13 Remote Configuration Escape Character
Carrier Detect Response Time
 S17 Changing Break Time
S15 Callback Time Delay
S19 MT2834BL Only Dial-Back Timer
S16 Callback Attempts
 S25 DTR Dropout Time
S26 Failed Password Attempts
S29 Local Inactivity Timer
S24 PBX/CBX Disconnect Drop Time for DSR/CTS/CD
 S37 Time Between DTR Active and Modem On-Hook
S30 Inactivity Timer
S32 Time Elapse for Escape Sequence
S36 Time Between DTR Inactive and Modem Off-Hook
 S48 Program V.34bis Connect Speeds
 Reading and Assigning S-Register Values
Examples of Assigning Values
Examples of Reading Values
 AT Command and S-Register Summary
 Callback Security and Remote Configuration
 Callback Security and Remote Configuration
Callback Feature Description
 To change your Remote Configuration feature status
Remote Configuration Description
 AT#CBN0xxxxxxxxxxCR
To set parity of the password/message prompt
 Callback Operational Sequence Procedures
 Remote Configuration Operation Procedures
Remote Configuration Procedures
 Remote Configuration and Callback Security AT Commands
 Remote Configuration/Callback Security S-Registers
 DIP-Switch Settings
 MT2834BA PC Board
Dip-Switch Settings
 DIP-Switch Option Settings
 Switch #4 AS/400 Mode Synchronous Mode/Leased Line/Dial-UP
 = Down
 Down
 Dip-Switch Settings
 Speaker Volume Control
 Switch Function Position Effect
Recording Option Configurations
 DIP Switches #13-14
DIP Switches #15-16 MT2834BA
DIP Switches #15-16 MT2834BL
 Warranty, Service and Tech Support
 Warranty, Service, and Technical Support
Multi-Tech Systems, Inc. Warranty & Repairs Policies
 Repair Procedures for International Distributors
Online Warranty Registration
 Country Telephone
Replacement Parts
Technical Support
Internet Sites
 Appendixes
 Upgrade Overview
Appendix a Upgrading Your Modem’s Firmware
Appendix a Upgrading Your Modem’s Firmware
 Download the Upgrade File
 Upgrade the Modem’s Firmware
 Appendix B Troubleshooting
Appendix B Troubleshooting
None of the LEDs Light When the Modem Is On
Modem Does Not Respond to Commands
 Appendix B Troubleshooting
 Modem Dials But Cannot Make a Connection
 Am Losing Data
Modem Cannot Connect When Answering
Modem Disconnects While On-line
File Transfer Is Slower Than It Should Be
 Am Getting Garbage Characters on the Monitor
 Appendix C AT Command Summary
Appendix C AT Command Summary
Command Values Description
 Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 100
DsNd
 Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 101
$FCn MT2834BL
 Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 102
$MBn
 Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 103
$SBn
 Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 104
Dial Tone
 Callback Security/Remote Configuration Command Summary
 25bis Commands
Password Command Summary
 Appendix D V.25bis Operation
Delayed and Forbidden Numbers
Appendix D V.25bis Operation
25bis Operation
 Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 108
25bis Mode AT Commands
25bis DIP-Switches
25bis Set-Up and Initialization
 25bis Responses Result Codes
25bis AT Commands
Enable/Disable V.25bis Mode $V Command
Change Serial Baud Rate CSP Command
 Disregard or Connect to Incoming Calls DIC or CIC Command
Dial Phone Number Provided CRN Command
Listing Delayed Phone Numbers RLD Command
Listing Forbidden Phone Number RLF Command
 ITU V.25bis Country Specific Information
 Appendix D V.25bis Operation Belgium
Singapore
Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 112
 Appendix E MultiModemBA/BL Cables
Appendix E MultiModemBA Cables
 Appendix F Regulatory Information
FCC Part 68 Telecom
FCC Part
 Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 115
Canadian Limitations Notice
 Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 116
South African Notice
 Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 117
Index
 Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 118
91-116
 Multi-Tech Systems, Inc. MT2834BA/BL Series User Guide 119
PBX/CBX Disconnect Drop Time for DSR/CTS/CD63