Multitech MMH900, User Manual

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Appendix J - Internal MMH2834 Composite Link Modem Commands
J.1.2 Dial Modifier Commands
Pulse or Tone Dial The MMH2834 dials numbers using either pulse or tone
P dialing, or a combination of both methods. Pulse dialing is a
method used by rotary-dial telephones, which involves the
timed opening and closing of line relay.
T Tone dialing is the method used by pushbutton (touch tone)
telephones, and is sometimes referred to as DTMF, or Dual-
Tone Multi-Frequency dialing.
The method used is selected by including a P for Pulse or a T for
Tone in the dialing command, right before the digits you wish to
have dialed in that manner.
For example, you would pulse-dial the number 555-1212 by
entering ATDP5551212 and hitting RETURN. You could tone-
dial the same number by entering ATDT5551212 and hitting
RETURN. If neither Pulse nor Tone dialing is specified in the dial
command, the MMH2834 uses whatever method used last. If the
modem has been reset or just powered up, it uses Pulse dialing,
even if the letter P is not included in your dial command.
Nearly all telephone systems in the U.S. are now compatible with
tone dialing. Since that is the faster method, you will probably
choose the tone method for your dialing.
An example of combining pulse and tone dialing could involve a
PBX system where 9 had to be pulse-dialed first, then the rest of
the number tone-dialed after pausing for a second dial tone. The
number would be dialed by entering ATDP9, T5551212 and
RETURN. (The comma causes a pause, which we’ll explain
soon.)
Set Pulse This command sets the time ratios between the open and
Dial Ratios closed portions of the dialing pulse frequencies. To set the
&P dialing pulse ratio of 60 mSec to 40 mSec, enter AT&P0. To set
a ratio of 67 mSec to 33 mSec, enter AT&P1. The factory default
is &P0.
Automatic You can cause the MMH2834 to pause during the dialing
Pauses in sequence by entering a comma character where the pause
Dialing is desired. This pause will last two seconds. If a longer
, (Comma) pause is desired, more than one comma may be entered
consecutively, with each comma causing a two second pause.
You also have the option of changing the length of the pause
caused by the comma, from two seconds to any other value from
0 up to 255 seconds. This is done by setting S-Register S8 (refer
to Appendix I). Each comma in a dialing command counts as one
of the sixty allowed characters.