Installation Instructions
Table Of Contents
CPO-PC400-W/CPO-PC400-UW HVAC CONTROLLER
EN0B-0085 IE10 R0420 20
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
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.
TX
5V
GND
Panel Bus
I/O Module #1
Isolaon
Barrier
RX
5V_ISO
GND_ISO
RS485+
RS485-
R
T
110VAC/230VAC
24VAC
Panel Bus
I/O Module #N
F1
71
72
73
74
75
76
77
78
71
72
73
74
75
76
77
78
L < 3m
R
T
C
A
A+C = MAX.3 Meters
24V~
24V0
FGND
CH1+
CH1-
GND1
CPO-PC400-W/CPO-PC400-UW