Ground Connections - Honeywell Sensepoint XCL Installation Manual

2.9 Ground Connections

Effective grounding is crucial to ensure stable Modbus
communications and to limit the effects of radio frequency interference.
Ground points are provided inside the back box. In order to prevent
false readings or alarms as a result of ground loops, ensure that the
shield of all cables are grounded at a single point, preferably at the
controller. Consideration should also be given to how conduit, glands
and the internal earth plate are also grounded.
NOTE
Any earth regime must avoid earth loops.
Installation
23