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
Serial Ports Macintosh modem
Additional Specifications Serial Ports
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
This file Does this
Your modem is now ready to use
Modem software
Networking
If Dial-Up Adapter Do this Is listed
Is not listed Go to Step
If TCP/IP Dial-Up Adapter Do this
Click Finish
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
Specify an IP address by clicking TCP/IP settings
Select Enable software compression
Double-clickDial-Up Networking
Make sure Use Telephony Dialing Properties is unchecked
Macintosh
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
Controlling Local
Online Mode
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
DIALING, ANSWERING, Hanging UP
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
Make/Break Ratio
Call Detection
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
Support
Distinctive Ring
References
Commands
There are four ring patterns in common use
Are graphical depictions of each ring pattern.These
Ring
Result Codes
Verbal Numeric
Working with Memory
Memory type Applies to Loss of power will Command
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
AT&B0
To allow your modem Set the serial port Command Rate as
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
Enhance throughput
Kbps
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
For your modem to Command Example
To make the host Business Command Example Modem
AT%L AT%L=PW0
Enable Local Security
Enabled
When using Autopass Prompting When using Password Prompting
Dial Security with Password Prompting
For your modem to enable Command
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
Software Flow
Hardware
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
Modem using
Testing the Business
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
Business Modem wont dial
For your modem to Command Enable message display
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
Basic Command Set
Alphabetic Command Summary
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
Hardware Flow
Flow Control Template
Template send AT&F1 to your modem
DTE rate* Kbps
None
19.2
Template send AT&F2 to the modem
Software flow control
Basic
Even
9600
6APPENDIX C Flow Control Template
Result Code Meanings
Result Code Meanings Sets
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
Additional
This feature Supports
Word Length Parity 1 Bit Stop Bits
Operate asynchronously follows
Pin Function Transmitted Data Received Data Signal Ground
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
Control Setting
Fax Mode Flow
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
128 Enable phase roll detection
Disable V.8 Call Indicate CI
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 Certification
FCC Registration
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