ZETRON 748, Техническое руководство

Страница: 80 / 259

Programming
66 025-9368H
Terminal Emulation Mode Example
This example assumes that you already know the basics of how to startup and configure the
communications software that you will be using.
Start your communications program and enter into the terminal emulation mode (ANSI or VT102
should do).
Configure the software for the correct COM port (the one your modem is attached to) and set the
parameters to 2400 baud, 8 data bits, 1 stop bit, and No Parity.
Type in the following “AT” commands one at a time, followed by a carriage return ( ENTER ), and
wait for the modem's response.
AT Commands Description
ATZ
Reset the modem to default programming.
OK
Response from the modem (local).
ATX1
Enable blind dialing, modem does not need to detect dialtone.
OK
Response from the modem (local).
ATDT8206363;
Dial the phone number of the 748 and stay in Command mode.
OK
Response from the modem (local).
ATDT12748
Send the program access prompt when you hear the overdial prompt.
Your should hear the two modems bring up their carriers, handshake,
and then silence when a connection has occurred.
CONNECT 2400
Response from the modem (local) indicating a valid connection at
the baud rate indicated.
Press the ENTER key and the Main Menu of the Model 748 is displayed.
An alternate method to the one just shown uses the “,” (comma character) delay marker to insert a
delay period between the phone number and the program access code.
ATDT8206363,,,,,12748
This will dial the phone number and then wait about 10 seconds and send the program access code.
You may need to add or subtract a few commas to adjust the delay period for a particular
installation. Each comma inserts two seconds of delay. The idea is you want enough delay to make
sure that the Model 748 has answered the line and the audio path has been established in both
directions. You should be able to send the DTMF over any voice prompt or overdial prompt tone.
Another alternative is to use the “R”, reverse mode modifier. (Note modems with Rockwell chip sets
may not support this mode!)
ATDT8206363,,,,,,R
This will dial the phone number and then wait about 12 seconds before sending the Answer tone.
You may need to add or subtract a comma to adjust the delay for any specific installation. Each
comma inserts a two second delay. The idea is that you want enough of a delay to ensure that the
Model 748 has answered the line and started to issue the overdial prompt before the computer's
modem starts its Answer tone. If voice prompts are programmed, you should set the delay long
enough the voice prompt is completed before the Answer tone is sent to the Model 748. You will
probably need to experiment a few times to get the timing right with the handshake. Each installation
will be different and your mileage may vary.