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Is it necessary to ground the shield wire in Modbus RTU comm

 
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bradX
Junior
Junior


Joined: 27 Oct 2025
Posts: 1
PostPosted: 27/10/2025 17:35    Post subject: Is it necessary to ground the shield wire in Modbus RTU comm Reply with quote
I have a project that connects 14 I/O expansion modules using Modbus RTU. In my setup, I cut off all the shield wires and didn’t connect them to ground. Our project also doesn’t have a separate grounding system for the signal part. But I see the system still works normally.

Now I’m thinking maybe I can use twisted-pair cable without shield to save cost — is it okay to do that?
Right now I’m using this cable: [url]https://heizka.com/18awg-shielded-cable-1-pair/[/url]
.
The price is quite cheap — should I keep using it, or should I use Belden cable instead?
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