Distech Controls ECL/ECB-PTU Series User Manual page 29

Figure 14: Typical Cable-Shield Grounding Requirements for a BACnet MS/TP Data Bus Segment with a Building
Controller located in the Middle of the Data Bus
Figure 15: Typical Cable-Shield Grounding Requirements for a BACnet MS/TP Data Bus Segment without
Building Controller
Typical BACnet 24VAC-
Powered Controller
Data Bus Shields: Twist
Data Bus Shield:
Together and Connect
Isolate with
to 'COM' Terminal
electrical tape
Data Bus: Shielded Twisted Pair Cable
Network Guide
BACnet MS/TP Communication Data Bus Fundamentals
Typical BACnet 24VAC-
Typical BACnet Line -
Powered Controller
Powered Controller
Typical BACnet 24VAC-
Powered Controller
Data Bus Shields: Twist
together and Isolate
with electrical tape
Electrical The shield of the data bus must be connected to
System the electrical system ground at one point only ,
ideally in the middle of the data bus as shown
Ground
Typical BACnet Line -
Powered Controller
Data Bus Shields:
Connect to 'COM'
Terminal
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