[chbot] RS232 FILTER

[Trevor Wignall]

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...
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.

On Tue, Oct 25, 2022 at 6:44 PM Marshland Engineering <
marshland at marshland.co.nz> wrote:

> Just a note, I'm not actually communicating with the RS232 when I have a
> fault. I download the program which takes 5 seconds and then the machine
> runs
> all day. The fault come up as a X Y or S travel fault not often and not
> repeatable.  The fault would indicate the encoder on the drive does not
> match
> up to the linear scale. My gut feeling is I get a spike on the bus and I
> get
> the error. Remove the RS232 cable, never get a fault. The earth loop sound
> like the issue.
>
>
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