I'm now finding that the longest cable (~50 feet) is having trouble with
garbage occasionally introduced by noise. I tried dropping the baud rate
from 9600 to 2400 (still faster than the printer) but that didn't help.
How can I remedy this? Should FGs of each device been tied together? Could
not doing this have lead to line noise?
Also, the cable is shielded, but I didn't do anything with the shielding.
Should it be grounded to the connectors, or one of the pins? On one or both
of the machines?
I do have maybe 10 feet of slack which I could cut of if shortening the cable
20% might help...(The other three cables are closer to 40 feet, and they all
work fine. However, the cable in question goes through 2 walls, and may be
passing some noise source that I'm not aware of.)
Thanks for any help!
-Colin Kelley ..{cbmvax,pyrnj,psuvax1}!vu-vsli!colin
Frame Ground means just that - GROUND. Tie this to a real Earth Ground (a
cold water pipe, the ground pin of the nearest AC outlet...)
>I'm now finding that the longest cable (~50 feet) is having trouble with
>garbage occasionally introduced by noise.
I'm not suprised - fluoresent lights are REAL BAD in the noise dept...
do *you* have any of them near the cable?
>How can I remedy this? Should FGs of each device been tied together? Could
YES
>not doing this have lead to line noise?
YES
(I was there once, also. RS-232's a die, then you bitch...)
--
"Never trust an idea you get sitting down" - Nietzche
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John Plocher {harvard,seismo}!uwvax!puff!plocher (school)
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