3Com OfficeConnect 56K Business Modem Command Reference
 3Com Corporation 3800 Golf Rd Rolling Meadows, Illinois
United States Government Legend
 Contents
 If You Are Using MS-DOS
Command and Online Modes
Other Operating Systems
Making International calls
 Result Code Display Commands Additional Result Code Subsets
Overview
Data Terminal Ready Data Set Ready Carrier Detect
Overview Serial Port Rates Connection Rates
 Setting DTE Rate to 230 Kbps
Setting up Dial Security
Password Prompting
Remote Configuration
 Error Control
MNP Error Control
Testing the Business Modem using AT&Tn
Received Data Flow Control
 Digital Loopback Testing AT&T3
Remote Digital Loopback Testing AT&T6, AT&T7
Canceling All Digital Loopback Test Requests &T5
Testing Using Keyboard Data AT&T6
 Getting New Operating Software
Sending New Software to your modem
If Your Modem Doesn’t Respond
Hardware Flow Control Software Flow control No Flow Control
 Additional Specifications Serial Ports
Serial Ports Macintosh modem
Registers
 About this Guide
Introduction
Finding Specific
Information This Guide
 Conventions
Icon Description
Convention Description
Wait n seconds between losing the connection
 Related
 About this Guide
 Connecting to Your ISP
Windows 95/98
 Your modem is now ready to use
This file Does this
Modem software
 If Dial-Up Adapter Do this Is listed
Networking
Is not listed Go to Step
 Click Finish
If TCP/IP Dial-Up Adapter Do this
Click Add Protocol Microsoft TCP/IP OK
 Windows 95/98
 Step Four Customizing the TCP/IP Settings
Click TCP/IP Settings
Click OK, and OK
If your ISP Do this
 Specify an IP address, if needed
Click Server assigned IP address
Click Specify name server addresses and enter
Click Server assigned server address
 For you to Use this connection
 Go to Start Settings Control Panel Modems
Setting up RAS
Select Remote Access Service and click Properties
Check Don’t detect my modem I will select it from a list
 Click Continue to complete RAS setup
Select Start Settings Control Panel
Go to Start Programs Accessories Dial Up Networking
Click Network
 Select Enable software compression
Specify an IP address by clicking TCP/IP settings
Double-clickDial-Up Networking
 Macintosh
Make sure Use Telephony Dialing Properties is unchecked
Macintosh computers
 System Configuration Accessing Internet
Installation Script and then configure Open Transport PPP
Installing the script
Slip or PPP dialing software
 Transport PPP Go to Apple Menu Control Panels Modem
 Macintosh
 Go to Apple Menu Control Panels PPP
 If You Are Using
Other Operating
Systems
Windows
 18CHAPTER 1 Connecting to Your ISP
 Using the AT Command SET
Using AT commands
Overview
General rules for
 Dial the following number using tone dialing
To configure your modem to Command
Re-execute the last-issued command
Use the X2 result code subset
 Settings for a register in the current configuration
To display Command
To change Command
ATI5
 Understanding
Bit-mapped
Registers
Getting a list Registers
 Command and Online Modes
If you want to Set the modem to Use this command
Modes of Operation
ATO0
 If you want to Command Return online
Mode
Return online and retrain
ATO1
 Online Mode
Controlling Local
Echo
 Or Fax mode
Data and Fax
Modes
Software manual
 Class 1 Fax Mode
If the modem This indicates Returns a value
 6CHAPTER 3 Modes of Operation
 DIALING, ANSWERING, Hanging UP
Dialing
Dial options
 ATD@
ATD
Atdr
Atdl
 Command does. Also can be used to repeat any
Disable carrier loss redial
Enable carrier loss redial
Redialing This command also defines the interval in seconds
 Force Answer Mode
Go through the answer sequence when it hasnt
ATA
Received an incoming call Manually answer a call
 If you want your modem Command
Making
International calls
International calls above 1200 bps
 Call Detection
Make/Break Ratio
Pulse dialing
 Caller ID Functions
 Modem Handles
Caller ID
 Caller ID Action Command
An Example of Unformatted caller ID presentation
AT#CID=0
AT#CID=1
 Distinctive Ring
Support
References
 Commands
There are four ring patterns in common use
Are graphical depictions of each ring pattern.These
Ring
 Result Codes
Verbal Numeric
 Memory type Applies to Loss of power will Command
Working with Memory
NVRAM, and Flash memory
 Saving a Phone Number to Nvram
ATDS2
 Saving a Command String to Nvram
Displaying S-Register Value Information
AT&F0
AT&F1
 Substitute a template other than &F1
AT&F2&W
 Commands
Controlling Result Code Displays
Additional Result Code subsets
What format they are displayed
 Additional Result Code Subsets
AT&A0
AT&A1
AT&A2
 Controlling EIA-232 Signaling
Tells the modem how to respond to the DTR signal
Data Terminal
Ready
 Signal
Data Set Ready
 Business Modem sends the CD signal
Carrier Detect
AT&C0
AT&C1
 4CHAPTER 7 Controlling EIA-232 Signaling
 Controlling Data Rates
Serial Port Rates
 To allow your modem Set the serial port Command Rate as
AT&B0
AT&B2
 AT&N0
AT&N1
AT&N9
AT&N2
 Command Values
Speeds with &N and &U
Speeds
AT&N
 To limit Use this command Where x is Lowest possible connect
If &U Then your modem
 Link Speed Index
 Kbps
Enhance throughput
46666 48000 49333 50666 52000 53333 54666 56000 57333
 8CHAPTER 8 Controlling Data Rates
 Accessing and Configuring Business Modem Remotely
Setting Up Remote Access
Its configuration remotely
You should be familiar with these terms before you continue
 AT%P0=password
 Accessing the Host
 Configuration computer
You should see a display similar to this
 AT%B0
AT%B6
AT%B1
AT%B7
 You can use the AT%Fn command to control the data format
 Remote-Access
Password, return online by pressing CtrlC or typing ATO
Commands
Quitting a
Page
 Dial Security
 Setting up Dial
Security
 To make the host Business Command Example Modem
For your modem to Command Example
AT%L AT%L=PW0
 Enable Local Security
Enabled
 When using Autopass Prompting When using Password Prompting
 For your modem to enable Command
Dial Security with Password Prompting
Autopass Dial Security
 Example Sending AT%E=3 erases passwords for accounts
Maintaining
Security Accounts
Account information
 For your modem to Command Enable Dial Security
What the Guest
User Needs to Do
Dial Security by entering ATS53.0=1
 For your modem to be set Command
For your modem to Command Disable Auto Answer
Security Remotely
Dialing In From the Remote Site
 10-10CHAPTER 10 Dial Security
 Flow Control
Hardware and software flow control
Received-data flow control
Transmit-data flow control
 Hardware
Software Flow
Control
 AT&R0
AT&R1
AT&R2
AT&I1
 Enable Hewlett Packard-Terminal mode. Applies only to
Does not look for your typed XON/XOFF commands
AT&I4
Characters from the data stream
 Transmit-Data Flow
By its attached computer
 11-6CHAPTER 11 Flow Control
 HANDSHAKING, Error Control Data COMPRESSION, Throughput
Handshaking
 For your modem to Command Enable the call indicate tone
Attaining Speeds Above 28.8 Kbps
Attaining 56 K Connections
Controlling the V.8 Call Indicate Tone
 Enable
Disable
Capabilities
Other Protocols
 Leveling ASL
 Error Control
Error-Control
Lower-speed
Protocols
 Have no error control Normal Mode
Asynchronous Mode
AT&M0
AT&M4
 Scheme similar to MNP
Flow Control
Two reasons
Remote end until it is acknowledged by the receiving device
 For the modem to Command
AT&K0
AT&K2
AT&K3
 Getting Maximum
Throughput
Maximum
Throughput results
 Public Domain Effects
 Getting Maximum Throughput
Page
 Here is a complete list of ATI n commands
Displaying Querying and Help Screens
Querying
Product code, and call duration
 ATI2
ATI3
ATI7
ATI11
 For your modem to display Command
AT$
 13-4CHAPTER 13 Displaying Querying and Help Screens
 Testing the Connection
Testing the Business Modem using AT&Tn
Testing the Business Modem using S-Register
All loopback testing conforms to ITU-T Recommendation
 Testing the Business
Modem using
AT&Tn
 Using AT&T1
 Using AT&T8
 Loopback DL testing
 AT&T6, AT&T7
Phone line. Data flow is shown in the figure below
There are two remote digital loopback options
Request AT&T4
 Testing Using Keyboard Data AT&T6
 14-8CHAPTER 14 Testing the Connection
 Testing the Business Modem using S-Resister
For your modem to use Use one of these command
Remote digital loopback using keyboard data
Remote digital loopback with built-in test pattern
 Testing Using Keyboard Data ATS16=8
 Starting Testing That Uses the Test Pattern
To use the test pattern during Command Testing with
When S16 is set to 4, the Business
Register
 14-12CHAPTER 14 Testing the Connection
 Troubleshooting
Problems That Occur Before Connecting
 For your modem to Command Enable message display
Business Modem wont dial
Display verbal messages
 Double characters are appearing on your monitor
Hear ringing but the Business Modem wont answer
 Problems that Occur After Connecting
Your screen displays random or garbage characters
 Mainframe computer keeps dropping your connection
 Errors during software download
If You Still Have Problems
 Problems that Occur After Connecting
 15-8CHAPTER 15 Troubleshooting
 Upgrading Your Modem
Checking Your Business Modem’s Software Version
 Getting New
Operating Software
Sending New
Software to your
 Enter AT~X!. The modem should respond as follows
 If Your Modem
Doesn’t Respond
 Registers
How bits are
Mapped to decimal
Values
 Converting Bits to
Decimal Values
01001111
113
 Using Bits
Using Decimal
Settings
Values of the bits and entering the total
 Bit-mapped registers have up to eight functions
 Register Default Function
Complete list of S-Registers
 Bit Value Result
 Be a problem if you expect a great
Number of errors during a call
Off their screens. When remote
Information about setting bit-mapped registers. For
 Up. S19=0 disables the timer
To ARQ mode only
Default is 3 seconds
Enable ITU-T V.21 modulation at
 Bit Result
 Disable the remote-access busy
128 Disable V.32 terbo S38
Thus enabling or disabling remote access
Default setting of zero allows no remote login
 Dial security enabled
Prompting enabled
Enabled
Disable 2400 symbol rate
 Disable precoding
Disable shaping
Disable V.34+
128 Disable V.FC S58
 Alphabetic Command Summary
Basic Command Set
Command Function
 Optional parameters
 When other modems share the line
Store the number in memory using the &Z command
Display help for the dial commands
Command mode echo ON. Your typing will
 Display the actual time. Set the clock using
Control when the speaker sounds
Between command and online modes
Errors in a non-ARQ data transfer
 Ampersand Command Set
 CD when it disconnects
Mode during a call by dropping DTR
With the Hn command
DTR signal. Dropping DTR ends a call
 Software support XON/XOFF signaling
Recommended setting for ARQ mode
Mode only
Error control. For this to work, the remote device
 This setting to transfer compressed files
Selective data compression. The modem
Negotiates only for V.42bis compression,
Line type Normal
 Ampersand & Command Set B-9
 Enable hardware flow control of received data
Send the computer a Data Set Ready DSR signal via
Originate mode Send DSR after dialing, on
When Carrier is lost, send a pulsed DSR signal
 Percent % Command Set
 Create and configure security accounts
Remotely configure a modems serial port rate
B10 115200 bps Remote configuration control
Cancel configuration changes and restore
 Octothorpe # Command Set
 14APPENDIX B Alphabetic Command Summary
 Flow Control Template
Hardware Flow
Template send AT&F1 to your modem
 None
DTE rate* Kbps
19.2
 Template send AT&F2 to the modem
Software flow control
 Basic
 Even
9600
 6APPENDIX C Flow Control Template
 Result Code Meanings Sets
Result Code Meanings
Result Code Meaning
 Result Codes Sets for Xn Values
10/CONNECT
Functions
Wait for 2nd Dial Tone W Wait for Answer @
 Specifications
Technical Information
Technical
Schemes are supported
 Error Control, Data
Dialing
Adheres to the following standards
This Supports
 This feature Supports
Additional
Word Length Parity 1 Bit Stop Bits
 Pin Function Transmitted Data Received Data Signal Ground
Operate asynchronously follows
DB-25 DB-9
 Most reliable performance
Mac Pin Mac Pin Description Modem Pin Modem Pin Description
 Macintosh modem
 Ascii Chart
 2APPENDIX F Ascii Chart
 Fax Service Class 1 Commands
FAX Service Class
Following optional Class 2.0 fax commands
FAX Information for Programmers
 Fax Mode Flow
Control Setting
FCC Notice
 Is making a data connection using an error control
Viewing Leds
This LED Status Means your Business Modem
Protocol
 RS232 mode has detected DTR signal
USB mode has detected successful USB registration
Off RS232 mode has not detected DTR
Off Has not detected the RTS signal from your computer
 Registers Their Functions and Default Settings
Counts and stores the number of rings from an incoming
Character. Valid range is 0*127
Valid range is 0*127
 Disable 250 ms pause before result
On DTR signal, autodial the number
At power-on/reset, autodial number
Disable HST
 Problem if you expect a great
For HST modulation only
From 1.5K bytes to 128.* for
Calls from remote users of slower
 Line, and at the timeout the Business Modem hangs up
S19=0 disables the timer
Disable V.32 modulation used for
Remote digital loopback
 Register Default Function Bit Value Result
 Disable the faster retrains that occur
128 Disable V.32terbo S38
To acknowledge receipt of all transmitted data. Default =
Thus enabling or disabling remote access. The default
 Disable V.8 Call Indicate CI
128 Enable phase roll detection
Reserved
 Disable preemphasis
Enable ring type a
Enable ring type B
Enable ring type C
 Warranty
Corporation Limited Warranty
 3Com Client SRO#
 3COM Corporation Limited Warranty J-3
 FCC Registration
FCC Certification
Statement
 FCC Notice Radio Television Interference
 Canada
 Glossary
 Glossary
 Glossary
 Glossary
 Glossary
 Glossary
 Glossary
 Glossary
 Glossary
 Glossary
 Transmission rate See it rate
Receiver/Transmitter
 Glossary
 Glossary
 Glossary