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ADM2490E Problem with One Master, Multiple Slaves Full Duplex RS-485 Communications

Question asked by JPD on Dec 18, 2017
Latest reply on Jan 4, 2018 by JPD

adm2490e PROBLEM: Full Duplex RS-485 Communications

Ref. attached figure:

1. Address from Master device is received by all slaves.

2. The addressed slave responds as per firmware code.

3. The Master device does not receive data.

4. It seems that one of the slaves does not release control of the bus, i.e. the dominant output is held low.This corrupts the output from the addressed slave.

5. The system works fine with one Master and one Slave (Full duplex RS-422 mode)

 

Please inform in case we are missing out on anything.

Thanks,

Jayant

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