Difficulties with serial ports and carrier detect.

[mel]

In article <1989Oct30.130157.28821 at oxtrap.uucp> time at oxtrap.uucp (Tim Endres) writes:
>I have a new IIcx with four Telebits stacked to the side.
>I built the system on the hard disk using a IIx and the installation
>floppies, since I wanted a clean installation. Then moved the drive
>to the IIcs.
>A/UX appears to be operating flawlessly. The modems work flawlessly
>under MacOS, except I can not tell if the carrier detect line is there
>since no MacOS software that I have tests it.
>

If you are using an Apple supplied cable for your modem you will find that
they are not wired to pin 8 on the RS-232 connector.  I believe they
"look" for the dsr signal on pin 6.  In any case you'll have to make or
find cables that are wired correctly to pin 8.  I've typically bought
Mac Plus to Imagewriter II cables and chopped them in half to use the
mini-din 8 ends.  Be careful since all of the signals cross in this
cable.  Thus color codes on one end are different from the other end.

Mel Shear
!rex!fleet!mel