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) 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 0–9, *, #, 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., – 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 H n Default: 0H0 – Go on-hook (hang up).H1 – Go off-hook (make the phone line busy). M n Default: 1M0 – 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 Default: 1V0 – displays result codes as digits (terse response).V1 – Displays result codes as words (verbose response). Resets modem to profile saved by the last &W command. &W n 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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6. Accept or make any changes desired to the modem initialization commands in the “Modem Initialization:” text area.
b. In the “Remote IP” field, specify the IP address to assign to the other end of the PPP connection.
e. Accept or make any changes desired to the PPP options in the “PPP Options” text area.
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5. Accept or make any changes desired to the modem initialization commands in the “Modem Initialization:” text area.
b. In the “Remote IP” field, specify the IP address to assign to the other end of the PPP connection.
e. Accept or make any changes desired to the PPP options in the “PPP Options” text area.