Distech ECYPSE User Manual

BACnet MS/TP Communication Data Bus Fundamentals
ECLYPSE User Guide 121
Data Bus Shield Grounding Requirements When Mixing Both
ECB 24V-Powered Controllers and ECB-PTU Line-Powered
Controllers
The shield on each data bus segment must be connected to the electrical system ground at
one point only, for example, at the ECY Series System Controller, as shown below in Figure
11-10 and Figure 11-11.
Typical BACnet 24VAC-
Powered Controller
Data Bus Shield:
Isolate with
Electrical Tape
Typical BACnet 24VAC-
Powered Controller
Typical BACnet 24VAC-
Powered Controller
Data Bus: Shielded Twisted Pair Cable
NET+ NET- NET+ NET- NET+ NET-
Data Bus Shields: Twist
Together and Isolate
with Electrical Tape
Data Bus Shields: Twist
Together and Isolate
with Electrical Tape
Typical BACnet Line-
Powered Controller
Data Bus Shields: Twist
Together and Connect
to ‘COM’ Terminal
NET- NET+ COM
Data Bus
Shield:
Connect to
the ‘S’
terminal
ECY Series
NET- NET + S
Electrical
System
Ground
The shield of the data bus must be connected to
the electrical system ground at one point only –
usually at the Building Controller, when present
Figure 11-10: Typical Cable-Shield Grounding Requirements for a BACnet MS/TP
Data Bus Segment with an ECY Series Controller located in the End of the Data
Bus
Data Bus Shields: Twist
together and Isolate
with electrical tape
Typical BACnet 24VAC-
Powered Controller
Data Bus Shield:
Isolate with
Electrical Tape
Typical BACnet 24VAC-
Powered Controller
Data Bus: Shielded Twisted Pair Cable
NET+ NET- NET+ NET-
Data Bus
Shields:
Connect to
the ‘S’
terminal
Typical BACnet 24VAC-
Powered Controller
NET+ NET-
Data Bus Shield:
Isolate with
Electrical Tape
Data Bus Shields: Twist
Together and Connect
to ‘COM’ Terminal
Typical BACnet Line-
Powered Controller
NET- NET+ COM
ECY Series
NET- NET + S
Electrical
System
Ground
The shield of the data bus must be connected to
the electrical system ground at one point only –
usually at the Building Controller, when present
Figure 11-11: Typical Cable-Shield Grounding Requirements for a BACnet MS/TP
Data Bus Segment with an ECY Series Controller located in the Middle of the Data
Bus

Distech ECYPSE Specifications

General

Brand	Distech
Model	ECYPSE
Category	Controller
Language	English