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SE7000/SE8000 Series BACnet Communication disconnects

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SE7000/SE8000 Series BACnet Communication disconnects

Lt. Commander Ramaaly Lt. Commander
‎2021-10-27 12:10 PM

Last Updated: Guinan RobertAndriolo Guinan ‎2021-10-27 06:53 PM

Issue

SE7000/SE8000 controllers are randomly going offline or are undiscoverable on BACnet network.

Product Line

EcoStruxure Building Operation, EcoStruxure Building Expert

Environment

  • Building Operation Workstation
  • Building Operation Automation Server
  • SSL SE7000
  • SSL SE8000

Cause

Improper terminations of the BACnet MS/TP communication cable.

 

art2.1.png

Resolution

The REF (reference) Terminal is a BACnet Reference which is a voltage reference required by BACnet testing lab (BTL) and it is rarely used in the industry. If not used as a reference, The Ref terminal should be left empty. It is not a terminal to land a shield nor a ground. 

 

At each thermostat (Cable Junction) :

  1. Connect the (+) and the (-) wires
  2. Twist the shields together
  3. Tape around the cable to prevent short-circuit. Ground the shield at one end only (usually on the BAS side) and leave the REF terminal empty
  4. Ensure that the shield wire is not connected to the REF (Reference) terminal.

art2.2.png

Labels (2)
Labels:
  • EcoStruxure Building Expert
  • EcoStruxure Building Operation
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