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Modem Reference 6-7
Dial Modifiers (continued)
S=n Dial a Stored Telephone Number
The S modifier instructs the modem to dial a number that had been
previously stored by the use of the AT&Zn=x command. The
command to dial a stored telephone number is ATDS=n, where n
represents telephone number storage location 0 or 1. For example,
ATD P S=1 pulse dials the telephone number written to telephone
number storage location 1.
, Delay Processing the Next Character
When the comma (,) modifier is included as part of the dial string
following the ATD command, the modem pauses before processing
the next character in the dial string. The duration of the pause is
dictated by the contents of S-Register S8.
The , modifier is frequently inserted after the digit (usually 9) used to
obtain an outside line from a PBX to allow sufficient time for the dial
tone to occur before the modem dials the telephone number. The W
modifier can be used in place of the comma.
Some countries place restrictions on the amount of time a modem
may delay during dialing.
T Tone Dialing Method
The T modifier is used with the Dial command to instruct the
modem to tone dial the telephone number that follows. See also the
ATT command.
W Wait for Second Dial Tone
The W modifier instructs the modem to wait for a dial tone before
processing the remaining characters in the dial string.
! Hook Flash
The ! modifier serves as a switch hook (or hook flash) signal. This
causes the modem to hang up (go on-hook) for about 0.5 seconds
then return to off-hook (the actual duration of the hook flash varies
in different countries).