Richard,

Here's a very good reference for RS-232C:  http://www.arcelect.com/rs232.htm

Bob
http://apsn.awcable.com


At 09:05 AM 4/19/2004, you wrote:
>Since there is power in my attic, I want to install my GPS receiver near=
 the
>roof vent at the end of the house and run the cable down to Larry's A/D.=
 The
>distance is about 100 feet and I think that is too far for RS232. I have=
 read
>where RS485 is useful for this issue. Any suggestions would be appreciated.
>Thank you.
>
>Richard Gagnon
>
>
>
>
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