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68 MultiModemISI Hybrid Series, ISIHI-2S
Chapter 4—MODEM AT Commands, S-Registers, Result Codes
Modem
P, T Pulse or Tone Dialing
Default: T
The ISIHI-2S’s modems dials numbers by using pulse dialing, tone dialing, or a
combination of both methods. Pulse dialing, used by rotary-dial telephones, uses the
timed opening and closing of a relay to encode the numbers. Tone dialing, used by push-
button (touch-tone) telephones, uses dual tone multifrequency (DTMF) dialing.
P selects pulse dialing.
T selects tone dialing.
Insert P or T in the dialing command just before the digits you want to pulse- or tone-dial.
If neither pulse nor tone dialing is specified in the dial command, the modem uses
whatever method was used last.
Note: When your modem is first turned on or reset, it uses the tone dialing method
(which is the default), even if you do not include T in your dial command.
Examples:
To pulse-dial the number 555-1212, type ATDP5551212 and press ENTER.
To tone-dial the same number, type ATDT5551212 and press E
NTER.
To call out of a PBX (switchboard) system where a
9
has to be pulse-dialed, and the rest
of the number has to be tone-dialed after pausing for a second dial tone, type
ATDP9,T5551212 and press E
NTER. (The comma causes a pause.)
V Switch to Speakerphone Mode
Inserting V into the dialing command causes the modem to switch to speakerphone
mode and dial the following number. Use ATH to hang up.
W Wait for New Dial Tone
Inserting W into the dialing command causes the modem to wait for another dial tone
before it resumes dialing. (It is not necessary to enter W at the beginning of the dialing
command.)
Note: Because the modem must be able to detect the dial tone for this command to
work, you also must select wait-for-dial-tone dialing with the X2 or X4 command.
, Dialing Pause
Enter a comma in the dialing string to make the modem pause while dialing. This pause
lasts two seconds (North American models) or four seconds (U.K. and International
models) for each comma entered. You can force longer pauses by entering multiple
commas, or you can change the length of the pause caused by a comma by setting
register S8 to any value from 0 through 255 seconds (North American), 4 through 7
seconds (U.K.) or 4 through 255 seconds (International).
Note: Each comma in a dialing command counts as one of the 40 allowed characters.