To get an overview of the status of the Modbus module, a direct command can be used that returns the following properties for each ReadGroup defined (see GetReadGroups for explanation on ReadGroups):
LastStart: Last read operation start
LastEnd: Last read operation end
Status: Current read operation status (Running, ScanOverrun, Faulted, Succeeded)
FaultDet: Details for last fault occured
Fails: Read operation consecutive fails