Modbus - XXMIT Block - Parameters - Active and Done


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For the XXMIT block, what constitutes an operation? Is it just the actual sending of a query or is it the sending of a query and receiving of a complete response that makes up one complete operation?

Is the "ACTIVE" parameter on for the whole process of sending and receiving of responses from a slave?

Also, in addition, with regards to the "DONE" parameter of the XXMIT, does it come on only after successful transmission of a query or after successful transmission and reception of a response?