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Modbus RTU over modem conection

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Thread Starter

Manu

I've found that some PLC are replying to the frame 00 00 + CRC (so doing a broadcast with 0 as function code) with their ID and an error code. But is it something genral to all Modbus PLCs or is specific to this constructor. Is it a Modbus specification?

Thanks for your help.
 
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