<div dir="ltr"><div>An alternative might be to use an isolated USB extender, which may be based on fibre-optics or on ethernet technology, so the USB-RS232 adapter can be plugged directly into the CNC machine. Probably not a cheap solution but possibly a last-resort...<br></div><div>It might also pay to watch out for a build-up of static electricity when the machine is in use, in case the pulse from a discharge is coupling into the CNC electronics via the RS232 cable.<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Oct 25, 2022 at 6:44 PM Marshland Engineering <<a href="mailto:marshland@marshland.co.nz">marshland@marshland.co.nz</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Just a note, I'm not actually communicating with the RS232 when I have a<br>
fault. I download the program which takes 5 seconds and then the machine runs<br>
all day. The fault come up as a X Y or S travel fault not often and not<br>
repeatable. The fault would indicate the encoder on the drive does not match<br>
up to the linear scale. My gut feeling is I get a spike on the bus and I get<br>
the error. Remove the RS232 cable, never get a fault. The earth loop sound<br>
like the issue. <br>
<br>
<br>
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