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536EX Chipset Developer’s Manual 41
Intel Confidential
Data Mode AT COMMANDS
D none
Dial Command: This command causes the modem to immediately go off-hook as an originating modem
and dial a telephone number with corresponding dial modifiers. Dial modifiers are parameters that define
how the modem should dial the telephone number.
Dial Modifiers
0–9 Dialing Digits
A, B, C, Tone Dial Characters
D, *, #
P Pulse Dial—configures the modem to use pulse dialing to dial a telephone number.
R Reverse Originate Mode—places the modem in answer mode. This modifier should be the
last character in the dialing string (for example, ATDT 12345678R). After dialing the
telephone number, the modem goes into data modem answer mode instead of originate
mode.
S = n Dial NVRAM Telephone Number—causes the modem to dial a telephone number
previously stored in the NVRAM with the AT&Zn=x command.
T Tone Dial—configures the modem to use DTMF tones to dial a telephone number.
W 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
processes the next command in the dial string. If a busy signal is detected, the modem
responds to the DTE with a busy response code and then goes 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 online command mode without initiating a
data modem handshake (used for phone directory auto-dialers).
<space> - ( ) Ignored by Modem—these four characters are ignored by the modem. Spaces also may be
included in the dial string to separate area codes and numbers.
En 1
Command Mode Echo: This command selects whether the modem echoes AT commands back to the
host in either online or off-line command mode.
n = 0 Echo disabled
n = 1* Echo enabled
Hn 0
Switch Hook Control: This command controls the telephone line relay (OHREL*) and causes the
modem to either hang up or pick up the telephone line.
n = 0* Hang up telephone line (go on-hook)
n = 1 Pick up telephone line (go off-hook)
Table 18. Data Mode Command Descriptions (Continued)
Command Default Description
NOTE: An asterisk (*) denotes the factory-default setting.