Hi Norm,

I need a bending radius on a few inches. The cable will be protected by mesh sleeving to preserve flexibility and add more toughness to it.
This project of mine is in its infant stage. I’m sorry that I did not take the time to fully explain the requirements but I myself don’t have all the information yet. I’m collecting all the information I can before committing to a final design approach.

The RS485 half-duplex and maximum 4 wires cable (power + twisted pair) is already decided and can not be changed.

I found a good (but not ideal) Belden cable 3106Aas a candidate. Its only problem is that does not give me a separate GND wire.

Dave,
Your suggested cable seems robust enough.
I only have one question: can one of the twisted pair be used for power transfer to the slave unit? I was told that the data wires should be twisted and power wires should be normal.

Thanks for the input.

Nick