Connect the shield at one end only to pin 1. It is an excellent way to trap radio frequency noise.
Use a twisted, shielded pair for the pin 2-3 and pin 3-2 connections (the data lines). This will also reduce interference
An RS-232C connection is only intended for use up to 50 feet. As you go longer, the signals weaken. We have used RS-232C as long as 200 feet in quiet locations, but that is really pushing it.
For runs up to 900 feet, use a line modem on each end ($60-$100? each). That will cut out almost all interference.
Sources of interference are welding, electric motors, fluorescent lights and EDM. Avoid them.
Don't plug a radio into the same outlet as the computer or the CNC machine. It induces voltage drops and spikes on the AC line.
Put a good 8' copper ground into the ground at the CNC machine if you can.
Gene Bowen.
Bigelow, Louis wrote:
delete the pin 1 connection!!!!
this is a frame ground pin and can (and has at our plant)
pass considerable current if there is any difference
in the ground potential. (we already had a $4,000 repair
bill from Okuma.)
Louis
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