Honeywell ComfortPoint Open CPO-PC400-W - BACnet MSTP Non-Isolated Connections; BACnet MSTP with Non-Isolated RS485

CPO-PC400-W/CPO-PC400-UW HVAC CONTROLLER
23 EN0B-0085 IE10 R0420
Recommended connection for BACnet MSTPMSTP Buses with non-isolated RS485
Interfaces
Fig. 14. Connection (L > 3 m) of RS485 interfaces 1, 2, or 3 (RS485 interface 1 shown) to a BACnet Bus
NOTES:
— Always power the CPO-PC400-W/CPO-PC400-UW with a transformer separate to the connected BACnet MSTP
modules.
— N = max. 30 modules
— Signal ground (signal reference) connection is recommended if not all devices are electrically isolated. For more
information, see “General Information on the RS485 Standard” section on page 7.
TX
5V
GND
#1
Isolaon
Barrier
RX
5V_ISO
GND_ISO
RS485+ RS485-
RT
110VAC/230VAC
24VAC
#N
F1
RS485+
RS485-
FGND
L > 3m
RT
RS485+ RS485-
FGND
CPO-PC400/CPO-PC400-W/
CPO-PC400-UW
FGND
24V0 24V~
CH1+
CH1-
GND1