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AT Command Set and S-Registers
Table 4-1. AT Command Reference (2 of 18)
AT
Command Description
D
Dial
This command causes the modem to immediately go off-hook
and dial a telephone number with corresponding dial modifiers.
Dial modifiers are parameters that define how the modem
should dial the telephone number.
0–9
A,B,C,D, *, # Tone Dial Characters
P
R
S= n
T
W
,
!
@
;
– ( )
Dialing digits
Pulse Dial — Configures the modem to use pulse
dialing to dial a telephone number.
Reverse Originate Mode — Places the modem in
answer mode. This modifier should be the last
character in the dialing string (e.g. ATDT 123-4567R)
Dial Stored Telephone Number — Causes the modem
to dial a telephone number that has been previously
stored in the modem's memory with the AT&Z n =x
command.
Tone Dial — Configures the mode to use DTMF tones
to dial a telephone number.
Wait for Dial Tone — Causes the modem to look for
dial tone for a specified amount of time. If dial tone or
the amount of time specified by the S-Register S6
times-out, the modem will then process the next
command in the dial string. If a busy signal is detected,
the modem will respond back to the computer with a
busy response code, and then go into off-line
command mode.
Pause — Causes the modem to pause or delay
implementing the next parameter in the dial string by
the time specified in S-Register S8 .
Flash Hook — Causes the modem to go on-hook for
0.75 seconds.
Wait for Quiet Answer — Causes the modem to wait for
specified amount of time (S-Register S7) followed by
5 seconds of silence before processing the next dial
modifier.
Return to Idle State — Causes the modem to enter
on-line command mode without initiating a data modem
handshake (used for phone directory auto-dialers).
Ignored by Modem — These four characters are
ignored by the modem, but space may be included in
the dial string for separating area codes and numbers.
Issue 1 November 1994
4-3
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