Wire Multiple Modbus Sensors

H

Thread Starter

hand10

Hi!

I am new to Modbus so I would appreciate some help. I have three digital sensors that I want to use as slaves over Modbus RTU communication. The sensors are RS485, 4-wire (A and B), supply 6-36V DC, output 4-20 mA.

I can connect one sensor to a USB tool, but how should I connect three of them? I have a breadboard, would this be ok? I am not sure how to do the wiring.
 
W
I'm an industrial guy so I think in terms of protected wiring: trays, conduit, panels, ducts, etc; and long wiring runs between sensors: hundreds of meters.

And you're talking breadboarding.

If your sensors are all local and fit on a breadboard then have at it.

Industrial signal wiring is usually TSP: twisted, shielded pair. For short 485 runs on a breadboard you're not likely to need shielding, but you might want to twist the copper conductors that you use to connect A/B lines. Parallel lines pick up a lot of noise.
 
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