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Modems

Smartmodem 1200 or compatible

If you have a Hayes Smartmodem 1200 or AT-compatible modem, switches 3 and 8 should be down:

  1 2 3 4 5 6 7 8
up BULLET BULLET   BULLET BULLET BULLET BULLET  
down     BULLET         BULLET
When switch 3 is down, the result codes are sent by the modem to the terminal or computer. When switch 8 is down, the modem can interpret the command being issued. This allows both Windows and UNIX communications systems to work.

``AT-compatible switch settings'' lists the function of each switch setting.

AT-compatible switch settings

Switch Position Function
1 up* Modem responds to DTR from computer
  down Modem forces DTR high, so no signal is required from computer
2 up* Result codes are in English
  down Result codes are numeric
3 up There are no result codes
  down* Result codes are sent in response to each modem command
4 up* Commands are echoed
  down Commands are not echoed
5 up* Modem answers phone
  down Modem does not answer phone
6 up* CD is asserted when carrier is actually present
  down CD and DSR are forced high
7 up* Modem is attached to single-line phone
  down Modem is attached to multi-line phone
8 up Modem does not recognize dialing commands
  down* Modem recognizes dialing commands
The asterisks (*) indicate the switch settings required. If you have a different modem, consult your reference manual for the proper switch settings to both send and receive calls.


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SCO OpenServer Release 5.0.7 -- 11 February 2003