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Modem AT Commands: Mini PCI Type 3B Data Fax Modem by 3Com User's Guide
Modem AT Commands
CAUTION: In most cases, your modem will work using the factory-set defaults. We recommend that you have a good
understanding of modems before you change any settings.
You can enter modem commands from several places, but the most common way is from terminal mode in your communications software.
The basic rules for entering AT commands follow:
Type commands in either upper or lower case, not a combination.
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You can enter up to 60 characters, not counting AT, carriage returns, or spaces (spaces are not necessary when entering several (a string of)
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AT commands at once; they just make it easier to read).
If you leave the number off a command, zero is assumed. For example, if you type ATE, ATE0 is assumed.
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Every command except A/ and +++ must be prefixed with AT and completed by pressing Enter.
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The modem will respond with OK, ERROR, or other result codes (see the result code summary below).
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For example, follow these steps if you want to view the version of firmware used in your modem.
1. Check the following table to find the AT command that controls viewing firmware information. The functions are listed in alphabetical order.
Note that the AT command for displaying the firmware version is I7.
2. Enter your communications software.
3. Enter Terminal mode.
4. Because almost all commands must be preceded by AT to get the modem's attention, prefix the command with AT. Type
Enter. The firmware version will be displayed.
To view defaults, widen the right-hand side of the view window.
Command
Syntax
Function
+++
+++
Escape to online command mode (not preceded by AT)
/
/
Pause (not preceded by AT)
A
ATA
Answer manually
A/
A/
Repeat last command (not preceded by AT)
D
ATD
Dial
n Phone #, 0 through 9
DT
ATDT
T Tone dial
DP
ATDP
P Pulse dial
DR
ATDR
R Call an originate-only modem
W Wait for second dial tone (X2, X4)
DTnWn
ATDTnWn
DTWn@
ATDTWn@
@ Wait for answer (X3, X4)
DTn!n
ATDTn!n
! Flash switch hook
DTn#n
ATDTn#n
# Auxiliary tone dial digit
DTn,n
ATDTn,n
, Pause in dialing (S8)
DTn*n
ATDTn*n
* Auxiliary tone dial digit
; Stay in command mode after dialing
DTn;n
ATDTn;n
DTn$n
ATDTn$n
$ Wait for calling card bong
DTn&n
ATDTn&n
& Wait for calling card bong
DTn"n
ATDTn"n
" Set quote mode for the following
D$
ATD$
Display a list of dial commands
DL
ATDL
Redial last number
Default
125 ms
2 seconds
and press
ATI7