124
ECLYPSE APEX
ECB-PTU Line-Powered Data Bus Controller Shield Grounding
Requirements
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 controller, as shown in the figures below.
Data Bus Shield
Connect to the ‘S’
terminal
RS-485
-
+
S
ECLYPSE
Data Bus: Shielded Twisted Pair Cable
Typical BACnet Line-
Powered Controller
Data Bus Shields: Twist
Together and Connect
to ‘COM’ Terminal
N
ET
-
N
ET
+
C
O
M
Typical BACnet Line-
Powered Controller
Data Bus Shields: Twist
Together and Connect
to ‘COM’ Terminal
N
ET
-
N
ET
+
C
O
M
Typical BACnet Line-
Powered Controller
Data Bus Shields: Twist
Together and Connect
to ‘COM’ Terminal
N
ET
-
N
ET
+
C
O
M
Typical BACnet Line-
Powered Controller
Data Bus Shield:
Connect to ‘COM’
Terminal
N
ET
-
N
ET
+
C
O
M
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 97: 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: Shielded Twisted Pair Cable
Typical BACnet Line-
Powered Controller
Data Bus Shields: Twist
Together and Connect
to ‘COM’ Terminal
N
ET
-
N
ET
+
C
O
M
Typical BACnet Line-
Powered Controller
Data Bus Shield:
Connect to ‘COM’
Terminal
N
ET
-
N
ET
+
C
O
M
Typical BACnet Line-
Powered Controller
Data Bus Shield:
Connect to ‘COM’
Terminal
N
ET
-
N
ET
+
C
O
M
Typical BACnet Line-
Powered Controller
Data Bus Shields: Twist
Together and Connect
to ‘COM’ Terminal
N
ET
-
N
ET
+
C
O
M
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
Data Bus Shield
Connect to the ‘S’
terminal
RS-485
-
+
S
ECLYPSE
Figure 98: 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
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 controller, as shown in the figures below.
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
N
ET
+
N
ET
-
N
ET
+
N
ET
-
N
ET
+
N
ET
-
Typical BACnet Line-
Powered Controller
N
ET
-
N
ET
+
C
O
M
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
Data Bus Shield
Connect to the ‘S’
terminal
RS-485
-
+
S
ECLYPSE
Data Bus Shields:
Twist Together
and Connect to
‘COM’ Terminal
Data Bus Shields:
Twist Together
and Isolate with
Electrical Tape
Data Bus Shields:
Twist Together
and Isolate with
Electrical Tape
Figure 99: 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
BACnet MS/TP Communication Data Bus Fundamentals
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