[LUNI] Long serial cables
Joel F. Hacker
hacker at cig.mot.com
Mon Dec 17 17:47:01 CST 2001
Used 100' before also...didn't even have sheilding.
Lower your speed
and make sure you use rs485 and not 232.
Probably could go longer than 100' if you had good shielded cables.
Built the cables myself from 22 gauge wire.
Used a drill to twist the wire pairs...twist them as tight as
On Mon, 17 Dec 2001, Patrick Fleury wrote:
> I am working on a project to hook some lab machines to a computer via the
> serial port. The main difficulty is that, because of space constrictions,
> the computer must be located in another room which is some distance away -
> say 100 feet. Everything I have ever read about serial cables tells me
> they will not work well at distances over twenty five feet and, over fifty
> feet, you are taking your life in your hands. I am pretty sure I can go
> through a 232 to 485 converter to make up the extra distance but I am
> curious about whether or not anybody has ever used very long serial cables
> for a task like this.
> 1) Have you ever used very long serial cables?
> 2) Did they work well?
> 3) Did you have to make any compromises to make them work well? For
> example, did you have to lower the baud rate?
> 4) Did you need special shielding?
> 5) If this works, where did you get the cables?
> Linux Users Of Northern Illinois - Technical Discussion
> luni at luni.org
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