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Appendix F - MMH2834 Modem Commands
Wait for New Dialtone W
A W inserted in the dialing command causes the MMH2834 to wait for another dial tone, and not
resume dialing until another dial tone is detected. It is not necessary to enter a W at the
beginning of the dialing command to wait for a modem dial tone, because the modem will do that
first (pause automatically).
In order for this command to work, you must select Wait-For-Dial Tone dialing with the X2 or X4
command, so that your modem will be able to detect the dial tone.
Reverse the Mode of Operation R
In certain operations you may need to reverse the mode of operation for your modem from
originate to answer or answer to originate so that it would answer the phone and go into answer
mode. This command turns off the reversing function with the R0 command and turns it on with
the R1 command with the modem in either command mode. If you want to reverse from the
originate mode, use R (with no number) in the dialing string.
Flash On Hook !
Some switchboard systems react to a momentary On Hook. An exclamation mark inserted in the
command causes the modem “flash” on hook for a half second (90 mSec in BABT), as if you had
held the switch hook button on a telephone down for a half second.
For example, to flash On Hook after dialing the number 555-1234 in order to transfer to extension
5678, you might enter ATDT5551234,,!5678. The commas cause a 4 second pause (just to be
safe).
“Calling Card” Detect Tones $
The MMH2834 has the capability to detect AT&T "calling card'' tones for the purpose of utilizing
the user's calling card number to originate an on-line connection. A $ symbol placed in the
dialing string causes the modem to pause and wait for an AT&T "calling card" or a 1600 Hz tone
(prevalent in the United Kingdom). When the tone is detected, the rest of the dialing string is
processed. If no tones are detected within 45 seconds the modem aborts by indicating a NO
CARRIER message. Hitting any key also aborts the $ command.
The following is an example of this command:
ATDT1028806127853500$123456789
(access/phone number) (credit card number)
Quiet Answer @
The @ command causes the MMH2834 to wait before processing the next symbol in the dialing
string. The wait is for one or more ringbacks followed by 5 seconds of silence.
If 45 seconds pass before the rings and silence, a NO ANSWER (R) result code is processed.
The @ command is used for accessing a system that does not provide a dial tone.
For example, ATDT5551212@6313550 causes the MMH2834 to dial the first number (555-1212)
and wait for 45 seconds for at least one ringback and 5 seconds of silence. If a busy signal is
detected, the MMH2834 hangs up and generates a BUSY result code. If it does not detect 5
seconds of silence, a NO ANSWER result code is generated after hanging up. If 5 seconds of
silence is detected, the second number (631-3550) is then dialed.