Honeywell ComfortPoint Open CPO-PC400-W Manual page 30

CPO-PC400-W/CPO-PC400-UW HVAC CONTROLLER
Connection to a CP-IO Bus Powered by the Separate Transformer
CPO-PC400-W/CPO-PC400-UW
Isola on
Barrier
GND_ISO
GND
RX RS485-
TX RS485+
5V 5V_ISO
NOTES:
— N = max. 16 CP-EXPIO modules or 16 CP-DIO modules (or a mixture thereof). The mode switch of the inte-
grated termination resistor of the final CP-DIO (CP-DIO #N) must be set to "ON." The CP-EXPIO module sup-
ports the addressing from address 0 to 15. Therefore, it supports 16 modules per channel. 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.
EN0B-0085 IE10 R0420
110VAC/230VAC
24VAC
110VAC/230VAC
F1
F2
* ~
*
0
FGND
GND
-
R
T
+
Fig. 21. Connection (L > 3 m) of RS485 interface 4 to a CP-IO Bus
CP-DIO/EXPIO #1
24VAC
L > 3m
30
CP-DIO/EXPIO #N
R
T