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RS485 loop back test.

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ku637

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I've a functional RS485 port (two wire) on a board with some microprocessor. (I want to do a loop back test on this board).In this board the RE and DE pins are tied together and controlled by the microprocessor.

No hardware change on this board is acceptable. So how to perform a loopback test.?

i was thinking of some external hardware to connect to this board to enable loopback test.

Thanks for any suggestions.
 

True loopback test is not possible in half-duplex systems. You need second device with RS485 port.
 
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