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