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Chapter 5 - AT Commands
Dialing Action Commands
Use dialing commands to dial and hang up.
Ds
Hn
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.
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
ISIHx 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
P, T
W
Redial Last Number
Pulse or Tone Dialing
Wait for New Dial Tone
,
;
Dialing Pause
Return to Command Mode After Dialing
!
$
@
^
Flash On-Hook
Detect Call Card Tone
Quiet Answer
Disable Data Calling Tone Transmission
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