Thanks a lot Matt,
That unique ID is in addition to the RS-485 address, like a transaction counter.
It looks like any single controller can cope with multiple commands being received at high speed, and will send the responses in some (any) order, using the unique ID from the respective command in the replies for the master to tell them apart.
This "parallel" mode probably does not apply as StreamDevice/Asyn is serializing the protocols and waits for the response before sending the next request.
Thanks again,
~Ralph
