Black Box MD1641A, MD1640A manual Dialing Commands Dialing Action Commands, Dial Command D

SERIES II INTELLIGENT DATA/FAX MODEMS

5.4 Dialing Commands

5.4.1 Dialing Action Commands

Dial Command D

The letter D in a command causes the Series II Modem to dial the telephone number immediately following it. For example, if you enter ATD5551212 and hit RETURN, the Modem 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, you type ATD on your keyboard and hit RETURN. Then hang up the headset. Unless you have a specific need to dial in this manner, we recommend you use the first method, where the telephone number is entered on your keyboard.

The Series II Modem 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 the section 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 on “ X” Command.)

Note: There is another method of dialing, called “DTR Dialing”, where by manipulating the DTR signal on pin 20 of the RS-232C/V.24 interface, a number stored in the modem's memory is automatically dialed. See the section on the DTR Dialing ($D) command for details.

Continuous Redial A: or :

If you select the Wait-For-Dial-Tone method of dialing (see X3 or X4 command), you can command the Series II Modem to continuously redial a busy number until your call is answered. This is done with the

A:command.

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