BACnet MS/TP Communication Data Bus Fundamentals
Network Guide 13
BACnet/IP to MS/TP Adapter RT- RT+ COM
BACnet/IP to MS/TP Router - + SC
Table 1: Common Identification Labels for BACnet MS/TP Data Bus Polarity for Distech Controls' Products
Distech Controls Product
Typical Data Bus Connection Terminals
Inverting Non-inverting Reference
Except for an EC-BOS and ECB-PTU Line-Powered Controllers, never connect the
shield of the BACnet MS/TP data bus to the Reference terminal. See Data Bus
Shield Grounding Requirements on page 24 for more information.
Table 2: Common Identification Labels for BACnet MS/TP Data Bus Polarity for other Manufacturers
Device Manufacturer
Typical Data Bus Connection Terminal
Inverting Non-inverting Reference
Common identification labels
for BACnet MS/TP data bus
polarity by other Manufactur-
ers
BASC
-+G
TxD-/RxD- TxD+/RxD+ GND
U- U+ COM
RT- RT+ REF
Sig- Sig+
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.
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