Distech ECYPSE - Page 111

BACnet MS/TP Communication Data Bus Fundamentals
ECLYPSE User Guide 111
Except for an ECB-PTU Line-Powered Controllers and ECY Series Controllers,
never connect the shield of the BACnet MS/TP data bus to the Reference terminal.
See Data Bus Shield Grounding Requirements on page 119 for more information.
Table 11-2: Common Identification Labels for BACnet MS/TP Data Bus Polarity for
other Manufacturers
Device Manufacturer
Typical Data Bus Connection Terminals
Inverting
Non-inverting
Reference
Common identification labels for BACnet
MS/TP data bus polarity by other
Manufacturers
B
A
SC
–
+
G
TxD–/RxD–
TxD+/RxD+
GND
U–
U+
COM
RT–
RT+
REF
Sig–
Sig+
S
Data–
Data+
When interfacing with BACnet MS/TP devices from other manufacturers, refer to the
documentation provided with the device to correctly wire the device.