PN 88300150
4/3/01
23
3.7
Dialing Commands
3.7.1 Dialing Action Commands
D
Dial Command
The letter D in a command causes the MT2834MR to dial the telephone number immediately
following it. For example, if you type ATD5551212 and hit ENTER, the MT2834MR dials the
number 555-1212.
The D command is also used in conjunction with a telephone set for manual dialing. You dial
the number on your telephone set, and after hearing the answer tone on your handset, type
ATD on your keyboard and hit ENTER. Then hang up the handset. Unless you have a
specific need to dial in this manner, we recommend you use the first method, where you type
the telephone number on your keyboard.
The MT2834MR gives you several choices regarding dialing methods. You can use tone or
pulse dialing, by inserting a letter T or a letter P in the command string. (See Section 3.7.2 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 3.9 X
Command.)
Note:
There is another method of dialing, called “DTR Dialing”, where by manipulating the DTR signal
on pin 20 of the RS232C interface, a number stored in the modem’s memory is automatically dialed. See
Section 3.9 on DTR Dialing ($D command) for details.
A:
Continuous Redial (not used in MT2834MRK or MT2834MRI)
If you select the Wait-For-Dial-tone method of dialing (see X3 or X4 command), it is possible
for you to command the MT2834MR to continuously redial (maximum 10 redials for DOC
units) a busy number until your call is answered. This is done with the A: command.
This command is used only if you have already reached a busy number after executing a
normal dial command. Type A: (you need not type AT, nor do you need to hit ENTER), and
the modem redials the number. If you again reach a busy signal, it redials again and again
until it no longer detects a busy signal. To stop the redialing, press any key.
:
Continuous Redial
Another way to redial a phone number continuously is to type a colon(:) at the end of the
phone number. The result is the same as if you had typed A: after observing that the number
was busy on the first dialing attempt. Using the colon in the dial command is a step saver.
H
Hanging Up, and Bringing the Phone Line Off Hook
You can make the MT2834MR hang up (go On Hook), or go Off Hook, with the H command.
Type ATH1 to bring the line Off Hook, just as if you had picked up the telephone handset.
To hang up, type ATH0 or ATH (remember that the default value is 0 when no number is
typed).
It is not necessary to type H1 to bring the line Off Hook when using the D command to dial,
since the modem will go off hook automatically when you hit ENTER at the end of the dial
command.