RS-485 Cable Length


Question

What is the maximum cable length for RS-485 communications?

Answer

The maximum cable length for RS485 is 4000 feet.

More Information

A ground wire must be used for reliable communication and the cable run must be a continuous length with devices hooked up in a "daisy chain" fashion.

The RS485 devices must also be terminated at each end of the run with no terminations at any of the devices in the middle of the loop.


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  • 22-Apr-2014
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