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AST RESEARCH TECHNICAL BULLETIN TB-0131 11-01-85
COMPATIBILITY OF AST-5251/12 WITH HAYES 2400 BAUD MODEM
The Communications Department has completed testing of the Hayes 2400
baud modem. Our test showed that the Hayes modem will work with the
AST-5251/12 as long as the modem is configured properly.
To accomplish this, you will first need to attach the modem to an
asynchronous port, and then initialize it for 2400 baud with a
communications software package. After this has been accomplished,
you will want to send a set of "AT" commands to the modem.
For the modem that will reside at the PC, the commands are as follows:
AT&F................Sets modem to synchronous mode
AT&M2...............Store Number Dial (Auto-Dial mode)
AT&Z(Phone #).......Store telephone number
AT&R0...............CTS tracks RTS
ATS26=50............Sets RTS-CTS time delay
ATQ1................Disables result codes back to the terminal
ATE0................Inhibits Command Echo
AT&W................Writes configuration to nonvolatile memory
This will set the modem to Synchronous Auto-Dial. For the modem that
will reside at the host, the commands are as follows:
AT&F................Sets modem to synchronous mode
ATS0=1..............Sets modem to Auto Answer
AT&M3...............Manual dial through DTR control
AT&R0...............CTS tracks RTS
ATS26=50............Sets RTS-CTS time delay
ATQ1................Disables result codes back to the terminal
ATE0................Inhibits Command Echo
AT&W................Writes configuration to nonvolatile memory
This will set the modem to Synchronous Auto-Answer. After this has
been accomplished and the modems are attached to the system, you would
then bring up the AST-5251/12 package. When the 5251/12 is brought
up, it will cause DTR to rise and in turn the modem will start
dialing. When the two modems establish communications the squelch
will stop and the 5251/12 will be on-line.