Honeywell ComfortPoint Open CPO-PC400-W Manual page 31

Connection to a CP-IO Bus Powered by a Same Transformer
110VAC/230VAC
F1
CPO-PC400-W/CPO-PC400-UW
Isola on
Barrier
GND_ISO
GND
RX RS485-
TX
RS485+
5V 5V_ISO
NOTES:
— * The 24V~ and 24V0 terminals at RS485-4 Interface have an automatic resetting fuse protection. For more
information, see "Wireless Connectivity" section on page 15.
— NOTES: N = max. 9 modules. The mode switch of the integrated termination resistor of the final CP-DIO (CP-
DIO #N) must be set to "ON." If the last module is CP-EXPIO, the end of line resistor must be included.
— For communication cable lengths, transmission speeds, and termination, see "General Information on the
RS485 Standard" section on page 7. For capacity restrictions, see "Connection to CP-IO Bus" section on
page 10. For fusing, see "Fusing" section on page 11.
24VAC
~
0
FGND
GND
-
R
T
+
Fig. 22. Connection (L < 3 m) of RS485 interface 4 to a CP-IO Bus
CPO-PC400-W/CPO-PC400-UW HVAC CONTROLLER
CP-DIO/EXPIO #1
L < 3m
31
CP-DIO/EXPIO #N
R
T
EN0B-0085 IE10 R0420