Query attempts

This is a Communication Control Block (CCB) parameter. It occupies byte 11 (counting from 0) in the CCB.

Sometimes a communications master will send out a query (poll, data request) but not receive a response. This can be caused by problems with the communications channel, a dead slave or other problems. This parameter specifies how many times a SPLat working as master will attempt to send a query before giving up on receiving a response.

Applies to the following protocols: ModBus RTU master.