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Subject: Re: [M]: RS-232 connector voltages
From: Gene J. Stratton
Reply To: mapug@shore.net
Date: Thu Oct 30 00:32:05 1997

Hi! It's just an improvement over Rob Roy's simple but elegant joystick.
This one sends RS-232 commands to the computer...so you get slow movement
of the scope with a little joystick deflection, and a rapid movement with a
lot of deflection of the joystick. There is a microcontroller between the
joystick and the rs-232 port, as you are correct, a raw analog joystick
won't just plug into the port. Easier than those nsew buttons in the dark,
w/o moving your eyes from the eyepiece!

Thanks for your info, sir!
--gene
At 11:42 PM 10/29/97 -0600, you wrote:
>Gene J. Stratton wrote:
>>
>> Thanks, Doc. I've hooked up an analog joystick to the port for scope
>> aiming (through a microcontroller, of course), and was considering using
>> the power there for the interface, rather than the 9v battery which
>> currently powers the microcontroller. Wonder what the 12 v will
>> supply...250 ma? does it come right off of the power input, or is it via a
>> trace on a pc board somewhere which might not like me swiping some power
>
>I just happen to have a front panel on my desk right now. The power to
>the 232 socket is a quite heavy PC board lead coming from the fuse. I
>suppose that if you draw too much, the fuse will go. The connection is
>from the input power to the fuse and then to the 232 power pin.
>
>I would think that a joystick would not work in the 232 socket. I am
>not sure what you are trying to do in this case.????
>
>Doc G
>