Distech Controls ECL/ECB-103 Series User Manual

BACnet MS/TP Communication Data Bus Fundamentals
Network Guide 27
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
together and Isolate
with electrical tape
Typical BACnet 24VAC-
Powered Controller
Data Bus: Shielded Twisted Pair Cable
NET+ NET- NET+ NET-
Typical BACnet 24VAC-
Powered Controller
NET+ NET-
Data Bus Shield:
Isolate with
electrical tape
Typical BACnet Line-
Powered Controller
Data Bus Shields: Twist
Together and Connect
to ‘COM’ Terminal
NET- NET+ COM
Typical BACnet Line-
Powered Controller
Data Bus Shields:
Connect to ‘COM’
Terminal
NET- NET+ COM
Electrical
System
Ground
The shield of the data bus must be connected to
the electrical system ground at one point only ,
ideally in the middle of the data bus as shown

Distech Controls ECL/ECB-103 Series Specifications

General

Brand	Distech Controls
Model	ECL/ECB-103 Series
Category	Controller
Language	English