[chbot] RS232 FILTER

[Daniel Powell]

I gather you are running a shielded cable with a shield earth? 

My only other suggestion is Opto isolation. Although I believe it won't do any signal conditioning and may be an issue with dropped serial signalling.  

https://nz.element14.com/advantech/bb-9spop2/rs232-optical-isolator-2-5kv-115/dp/3523130?gclid=CjwKCAjw79iaBhAJEiwAPYwoCCn2X7oTS1D2glv_-y9x8ErIYW0aUk-PdOwixUXsvDmsBsU3ryasYRoCnH4QAvD_BwE&CMP=KNC-GNZ-SHOPPING-PMAX-3523130

There are some $10 versions on aliexpress. 

Cheers, 
Daniel. 

-----Original Message-----
From: Chchrobotics <chchrobotics-bounces at lists.ourshack.com> On Behalf Of Marshland Engineering
Sent: Tuesday, 25 October 2022 10:32 AM
To: chchrobotics at lists.ourshack.com
Subject: [chbot] RS232 FILTER

I have a CNC mill with a RS232 port. If I leave the cable connected to the pendant, any spike in the workshop upsets the CNC control. Turing some things on or welding etc. It is 40 years old so the internal caps may be a bit dogy.
I was wondering where I could find a filter off the shelf (too many other projects to make new) that I can put in the line. Maybe something I can easily modify. It only works at 9600 baud so low bandwidth.  

Cheers Wallace


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