This section applies to Modbus Shared controllers only.
If you use Heartbeat polling to monitor the state of the idle line to any of the above controllers, you need to specify the address of the register or coil that the driver is to read for such heartbeating.
Use the Heartbeat Address field toward the bottom of the Shared tab to specify this address.
For information on configuring the fields that are displayed within the Heartbeat section of the Shared tab, see Poll Outstations on the Other Channel.