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3.2
Dialing Commands
Dialing commands are used to dial and to hang up.
Ds
Dial
s = phone number
Default: none
The letter D in a command 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.
The MT2834MR6 supports several dialing methods. With the D command, you can specify
either pulse (ATDP) or tone (ATDT) dialing. You can also modify the dialing command with
several characters that are explained in "Dial Modifier Commands" in this chapter.
The MT2834MR6 lets you select either smart (wait-for-dial-tone) dialing or blind dialing.
With smart dialing, the modem waits for and detects dial tones and busy signals. With blind
dialing, the modem works with timed pauses (determined by the value of register S6), not
dial tone and busy signal detection. See the X command for more information on blind and
smart dialing.
A:
Continuous Redial
If you select smart dialing through the X3 or X4 command, the A: command lets you
continuously redial a busy number until your call is answered. (North American units have a
maximum of 10 redials; this command is not available on U.K. or International models.)
Use this command only if you have reached a busy number after executing a normal dial
command. Type A: (you need not type AT, nor do you need to press ENTER), and the
modem redials the number. If you again reach a busy signal, the modem continues to redial
until it gets through. You can stop the modem from redialing by pressing any key.
To save a step when redialing a phone number, enter a colon (:) at the end of the phone
number. The result is the same as if you had entered A:
Note:
This command has been largely superseded by software-based continuous redial features.
Hn
On-Hook/Off-Hook
n = 0 or 1
Default: none
You can make the modem go on-hook (hang up) or go off-hook with the H command.
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.
Chapter 3 - AT Commands
26
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