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MultiModemISI Hybrid Series, ISIHP-2S/2U/4S/4U/4SD 79
Modem AT Commands & S-Registers
O Go back online
Dialing Commands
Use dialing commands to dial and hang up.
Ds Dial
s = phone number
Default: none
Causes the modem to dial the telephone number immediately following it.
For example, if you type ATD5551212<cr>, the modem dials the number
555-1212.
Hn On-Hook/Off-Hook
n = 0 or 1
Default: 0
Makes the modem hang up (go on-hook) or simulate the action of picking
up a telephone handset (go off-hook).
H0 (or H) hangs up the modem
H1 brings the line off-hook, just as if you had picked up
the telephone handset.
It is not necessary to use the H1 command to bring the line off-hook when
using the D command. The modem automatically goes off-hook when you
press ENTER at the end of the dial command.
Dial Modifier Commands
ISIHP-2S/2U/4S/4U modems rely on the terminal adapters on the card for
dialing. For backwards compatibility, the following dial modifier commands
can be included in the dial string. They are accepted by the modem, but
ignore the actual function. These commands are:
L Redial Last Number
P, T Pulse or Tone Dialing
W Wait for New Dial Tone
, Dialing Pause
; Return to Command Mode After Dialing