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Goals and Symptoms
The purpose of this resolution is to diagram the RS485 wiring for Modbus communications between a Momentum processor and a Merlin Gerin DC150. The RS485 pinout shown in the DC150 User Manual is incorrect.
Facts and Changes
All Momentum Processors can be used in this application. The following have a builtin Modbus RS485 communications port and do not require a 172JNN21032:
Causes and Fixes
RS485 wiring from a Momentum processor (port 2, db9) to a Merlin Gerin DC150.
NOTE: The signal pinouts for the db9 RS485 connector as shown in the Merlin Gerin DC150 User Manual are incorrect. The correct pinouts are shown above.