Honeywell ComfortPoint Open CPO-PC400-W Manual page 20

CPO-PC400-W/CPO-PC400-UW HVAC CONTROLLER
Connection to Panel Bus I/O Modules Powered by the Same Transformer as the CPO-
PC400-W/CPO-PC400-UW
This configuration is suitable for connecting Panel I/O modules which are all located in the same wiring cabinet as the
CPO-PC400-W/CPO-PC400-UW.
CONNECTION VIA RS485 INTERFACES 1, 2, OR 3
A
R
T
5V_ISO
GND_ISO
Isola on
Barrier
5V
GND RX TX
CPO-PC400-W/CPO-PC400-UW
Fig. 11. Connection (L < 3 m) of RS485 interfaces 1, 2, or 3 (RS485 interface 1 shown) to a Panel Bus
NOTES:
— N = max. 16 modules.
— For communication cable lengths, transmission speeds, and termination, see "General Information on the
RS485 Standard" section on page 7. For fusing, see "Fusing" section on page 11.
EN0B-0085 IE10 R0420
110VAC/230VAC
24VAC
F1
20
L < 3m
Panel Bus
I/O Module #1
71
72
73
74
A+C = MAX.3 Meters
Panel Bus
I/O Module #N
71
75
76 72
77 73
78 74
C
75
R
76 T
77
78