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maybe this question is a little bit off-topic. I'm happy is someone answer me.

i have a rs485 net, where V280 is the master and there is 10 slave. My question is: V280 perform a query to the slave 1.Then it wait the response for perform a new query OR the master(V280) can do more than 1 query and then manage the responses?

Thank you very much and excuse me for the disturb.

Best Regards


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Hi Fabio,

The Master is polling the Slaves one by one, command by command. You cannot start next command before the previous command is fully executed. That's why the right way ot activate command is with N.C. contact of Function in progress.

This is how Modbus as protocol works. It's not related specific to Unitronics.

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