----- Original Message -----
Sent: Monday, August 28, 2000 8:22 AM
Subject: RE: [M]: Still blowing fuses - RS232 port related


> > Holy Moley! What purpose was Meade trying to achieve by applying power
to pin 1
> > of the RS232/CCD sockets?
>
> That's a real good question. Long ago I learned that one of the goals
> of the RS232 standard was to create an interface that wouldn't blow if
> pins were incorrectly connected so that when a newbie built a cable
> incorrectly (or even a veteran :), no damage would be done.
>
> By ignoring this part of the standard, Meade's given us a potential
> for misery here. It seems especially egregious given that no known
> devices seem to require power from this port on the scope.
>
> Given the problems I've had in the past with the poor building of the
> RS232 connectors supplied by Meade, I think I'll make some time to
> inspect them all and rebuild where necessary.
----snip----
Joe,

I think the 1220 field de-rotator draws its power from this plug, along with
the commands for de-rotating from the serial port. Correct me if I'm wrong,
but I
think this is the reason for including the 18V power in the plug.

Don

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