The motherboad serial port is usually wired DTE (Data Terminal Equipment).
The modem is wired DCE (Data Communications Equipment).
The Computone board is probably also DCE so a 'straight' cable will
work with a terminal.
If you wish to connect DTE to DTE or DCE to DCE you need to use a null modem
or a cable with pins
1 - 1
2 - 3
3 - 3
7 - 7
and for hardware flow control
4 - 5
5 - 4
and for carrier
8 - 20
20 - 8
and for some software
22 - 22
6 - 11
11 - 6
> I'm trying to connect a dumb serial terminal to serial port (ttyS1). I am
> using a RS-232 cable. This does not seem to work. If I connect a modem to
> the port (using same cable) it works fine. When connecting the terminal
> (with same cable) to a SCO-Unix system it works fine also (using
> computone
> board).
>
>
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