Web Manager for Administrators > Configuration>Serial/AUX>Aux/Modem Port > AT Commands for Modem Initialization

AT Commands for Modem Initialization
In most cases, the default modem initialization commands are acceptable. For when changes are necessary, this section provides a brief introduction to the AT (ATtention code) commands that are used to control the modem’s operation. The command format is ATXn, where X is the command and n is the numeric value for the command. If the value is 0 (zero), it can be omitted from the command. For example, AT&W is the same as AT&W0. The following table defines the most-commonly-used commands: ATA, ATD, ATH, ATM, ATV, ATZ, AT&F, and AT&W.
Commonly-Used Supported AT Commands (Sheet 1 of 4)
AT
 
Precedes all command lines except A/, A:, and escape sequences.
A
A/
D s
Dial telephone number s, where s is the dial string modifier, which may be up to 40 characters long and include the 09, *, #, B, C, and D characters, and the L, P, T, V, W, S, comma (,), semicolon (;), !, @, ^, and $ dialstring modifiers.
L – Redial last number. (Must be placed immediately after ATD.)
P – Pulse-dial following numbers in command.
T – Tone-dial following numbers in command (default).
V – Switch to speakerphone mode and dial the following number. Use ATH command to hang up.
W – Wait for a new dial tone before continuing to dial. (X2, X4, X5, X6, or X7 must be selected.)
, – Pause during dialing for time set in register S8.
; – Return to command mode after dialing. (Place at end of dial string.)
! – Hook flash. Causes the modem to go on-hook for one-half second, then off-hook again.
@ – Wait for quiet answer. Causes modem to wait for a ringback, then 5 seconds of silence, before processing next part of command. If silence is not detected, the modem returns a NO ANSWER code.
^ – Disable data calling tone transmission.
$ – Detect AT&T call card “bong” tone. The character should follow the phone number and precede the user’s call card number as in the following example: ATDT1028806127853500$123456789.
DS= y
y=0-2
Dial a number previously stored in a directory number y by the &Zy=x command. Example: ATDS=2.
H n
n = 0 or 1
H0 – Go on-hook (hang up).
H1 – Go off-hook (make the phone line busy).
M n
n = 0, 1, 2, or 3
M0 – Speaker always off.
M1 – Speaker on until carrier signal detected.
M2 – Speaker always on when modem is off-hook.
M3 – Speaker on until carrier is detected, except while dialing.
V n
n = 0, 1, or 2
V0 – displays result codes as digits (terse response).
V1 – Displays result codes as words (verbose response).
Z
&F
&W n
n = 0 or 1
Stores current modem settings in non-volatile memory and causes them to be loaded at power-on or following the ATZ command instead of the factory defaults. See also the &F command.
&W1 Clears user default settings from non-volatile memory and causes the factory defaults to be loaded at power-on or following the ATZ command.
To Configure an AUX Port for IPDU Power Management [Expert]
This procedure assumes an AlterPath PM intelligent power distribution unit (IPDU) is connected to one of the AUX ports.
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To Configure an AUX Port for PPP [Expert]
This procedure assumes an external modem is connected to the selected AUX port.
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Additional fields appear on the screen.
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Accept or make any changes desired to the modem initialization commands in the “Modem Initialization:” text area.
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To Configure the Internal Modem [Expert]
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Accept or make any changes desired to the modem initialization commands in the “Modem Initialization:” text area.
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