Specifications

Cascade Modem Manual
Copyright © 2007 Diamond Traffic Products, Inc
Page 23
3.5. AT Command Applications
Pause
When placing a call from an office with a telephone connected to a PBX it may be necessary to dial an access code
(usually the digit 9) to get an outside line. Inserting a comma in the telephone number commands the modem to
pause for a specific length of time. The factory default pause time is 2 seconds.
Example : Dial 9, pause, dial number.
Enter : ATDT9, T1234567
Multiple commas may be used for a greater delay time.
Touch Tone and Pulse Dialing “T” and “P”
The modem can use DTMF (touch-tones) “T,” or dial pulses “P” when dialing a telephone number. If the dial
command does not specify which type to use, the modem defaults to the type last specified. The power-on default
value is T.
Example : Pulse dial 9, pause, touch-tone dial number
Enter : ATDP9, T1234567
Redial Last Number “A/”
Use A/, the repeat command, to redial the last telephone number
dialed when a busy signal is received.
Return to Command State “ ; ”
The modem can be forced to reenter the command state after dialing (without hanging up) by ending the dial
command with a semicolon. This is useful when using the modem as an auto dialer.
Example : Touch-tone dial 9, pause, dial number, return for command.
Enter : ATDT9,1234567
Automatic Answering
The S0 register controls the number of rings that must occur before the modem answers a call. The register may
range in value from 0-255.
S0=0 DO NOT ANSWER TELEPHONE
S0=1-254 ANSWER ON RING 1 TO RING 254
S0=255 ANSWER ON RING 255
*When S0 is set to 0, the modem will not auto-answer.
Dial a Number “D”
The Dial command takes the form Dn, where “n” is a string of characters. In the simplest form, “n” will be only the
digits of the phone number to be dialed.
Example : Dial number.
Enter : ATD5554567
In response to this command, the modem dials the telephone number “555-4567” and then waits for carrier from a
distant modem. If no carrier is detected within a given time (the default time is 30 seconds), the modem
automatically releases the line and sends a NO CARRIER result code.
If carrier is detected, the modem gives a CONNECT result code and goes on-line, permitting communication with
the distant modem.
The Dial Command may also be issued without a telephone number. ATD causes the modem to pick up the
telephone line without dialing a number.