: By default, the Modbus drivers monitor holding address 0 for connection status. If the Modbus device does not have holding address 0, then it will not show the "connected" status. You will still be able to read data from the device.

Here are the major differences for the Modbus drivers:

Review the different Modbus drivers and their uses. 

Mitsubishi QJ71E71

Modbus

Modbus ASCII (Gen1)

Modbus | Litmus Automation Documentation

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