Issue
Problem with Continuum controller being used to poll EMon Class 3000 MODBUS RTU Meters
The Controller was unable to poll all of the meters installed on the field bus.
Environment
Continuum controller being used to poll EMon Class 3000 MODBUS RTU Meters
Cause
When connecting multiple Class 3000 meters to a field bus, ONLY the last Class 3000 meter in the field bus string should have the biasing resistor pack installed. Having multiple termination resistors will load the bus down.
Resolution
-
All other biasing resistors should be removed from J17 on meters attached to the field bus.
If there is still a problem - Change the E-Mon "key2000" to the RS232 protocol. Using the E-Mon Repeater will provide a stronger RS-485 signal to drive their devices. Put the X-Driver on an RS-232 port of the controller.