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IEC-101 Queue System
In halfduplex communication device, whether queue system is possible or not in IEC-101?

I am using RS485 (Halfduplex) output device for IEC-101 communication. Triangle microworks send some query in queue basis. but my device not support the queue because of halfdulpex communication.

Triangle microworks send 3 quries in queue basis. Iam getting 1st response for 1st query only. We are not having Rs232 port. So what shall i do for this? Do you have any idea?