Multitech MMH900, User Manual

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Appendix J - Internal MMH2834 Composite Link Modem Commands
J.1.1 Dialing Action Commands
Dial The letter D in a command causes the MMH2834 to dial the
Command telephone number immediately following it. For example, if
D you enter ATD5551212 and hit RETURN, the MMH2834 dials
the number 555-1212.
The MMH2834 gives you several choices of dialing methods.
You can use tone or pulse dialing, by inserting a letter T or a P
in the command string. (See section J.1.2 on Dial Modifiers)
You can also configure the modem to either wait for and detect
dial tones and busy signals (which we call “Wait-for-Dial-Tone”
dialing or “Smart” dialing), or work with timed pauses without dial
tone and busy signal detection (which we call “Blind” dialing; see
Section J.1.5, “X” Command.)
Note: There is another method of dialing, called “DTR Dialing”,
where by manipulating the DTR signal on pin 20 of the RS232C/
V.24 interface, a number stored in the modem's memory is
automatically dialed. See Section on DTR Dialing ($D command)
for details.
Continuous Redial If you select the Wait-For-Dial-Tone method of dialing (see
A: or : X3 or X4 command), you can command the MMH2834 to
continuously redial (up to 10 redials for DOC units) a busy
number until your call is answered. This is done with the A:
command.
This command would be used only if you had already reached
a busy number after executing a normal dial command. You
simply enter A: (you need not enter AT, nor do you need to hit
RETURN), and the modem will redial the number for you. If you
again reach a busy signal, it redials again and again until it no
longer detects a busy signal. You can stop the MMH2834 from
redialing by pressing any key.
Another method used to cause the modem to redial a phone
number continuously is to enter a colon : at the end of the phone
number. The result is the same as if you had entered A: after
personally observing that the number was busy on the first
dialing attempt. Using the colon in the dialing string is a step
saver.
Dialing a Stored A telephone number that you have stored in the MMH2834's
Number number memory may be automatically dialed by entering
N ATNn where n = 0, 1, 2, 3, 4, 5, 6, 7, 8 or 9. For example, a
number stored at N3 would be dialed by entering ATN3 and