This particular message indicates that the serial port ON YOUR COMPUTER is in
use by some other prog. or (much less likely) broken in some way). Look for
programs like AOL, clock tweakers that dial periodically, FAX software that is
ready to receive from a modem attached to that port, etc. Stop everything you
think might have a use for the serial port. Keep trying till your prog caan
open the serial port. Once it does, THEN and only then are you in the domain
of testing wires.

-- Bob

Michael Gerson wrote:
>
> I'm having trouble with my LX200 RS232 port. I've tried a number
> of software programs and I'm unable to get a response out of the
> telescope. The type of messages I get are "unable to open communication
> port". So I tried another computer with the same results. I triple
> checked my RS232 to DB9 connection. The pin out is correct and I have
> a connection between the RS232 and the DB9 verified by an ohm meter.
>
> I've tried every com setting on both computers. What am I missing?

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