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Appendix D - AT Command Summary
This section summarizes your modem's AT commands. For detailed information on the commands,
download ZPXHELP.EXE from the Multi-Tech BBS (see "Call the Multi-Tech BBS" in Chapter 3).
AT Commands
Command: +++AT<CR> Escape Sequence
Values:
n/a
Description:
Puts the modem in command mode (and optionally issues a command) while remaining online.
Type +++AT and up to ten command characters, then press ENTER. Used mostly to issue the
hang-up command: +++ATH<CR>.
Command:
AT
Attention Code
Values:
n/a
Description:
The attention code precedes all command lines except A/ and the escape sequence.
Command:
ENTER Key
Values:
n/a
Description:
Press the ENTER key to execute most commands.
Command:
$
Detect AT&T's "call card" tone
Values:
n/a
Description:
This symbol placed in dialing string enables the modem to detect AT&T's "call card" tones to
access user's calling card when originating an on-line connection--
Command:
A
Answer
Values:
n/a
Description:
Answer an incoming call before the final ring.
Command:
A/
Repeat Last Command
Values:
n/a
Description:
Repeat the last command string. Do not precede this command with AT. Do not press ENTER to
execute.
Command:
B n
Communication Standard Setting
Values:
n = 0–3, 15, 16
Default:
1 and 16
Description: B0
Select ITU-T V.22 mode when modem is at 1200 bps.
B1
Select Bell 212A when modem is at 1200 bps.
B2
Deselect V.23 reverse channel (same as B3).
B3
Deselect V.23 reverse channel (same as B2).
B15
Select V.21 when the modem is at 300 bps.
B16
Select Bell 103J when the modem is at 300 bps.
Command:
C n
Carrier Control
n = 1
Values:
Default:
1
Description: C0
Transmit carrier always off. (Not supported.)
C1
Normal transmit carrier switching (included for backward compatibility with some software).
MTPSR3-200
Appendices
59
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