Distech ECYPSE - Page 133

BACnet MS/TP Communication Data Bus Fundamentals
ECLYPSE User Guide 133
Figure 11-19: The 24V COM / C Terminal of all Devices must be Connected to the
Grounded Power Supply Bus
24 VAC
AC Power
Source
24 / 120 / 208 /
240 / 277 / 347 /
480 VAC, 1Ø, 2-
Wire plus Ground
24V COM
24V AC/DC
BACnet Device
Power Supply
Fuse: 4A Max.
Fast Acting
C
RC
BACnet Thermostat
Electrical
System
Ground – At
Transformer
Only
Maintain consistent
polarity when connecting
controllers and devices to
the transformer.
The 24V COM / C
terminals of all devices
must be connected to the
power supply bus that is
grounded.