Wiring for communications
Carrier® ChillerVu™
(OPN-PSM-MPCXPE)
Carrier Proprietary and Confidential
CARRIER CORPORATION ©2017
Installation and Start-up Guide
23
All rights reserved
Ethernet, BACnet MS/TP, ARC156, and CCN wiring specifications
For...
Use...
Maximum Length
Ethernet
CAT5e or higher Ethernet cable
328 feet (100 meters)
BACnet
MS/TP*
BACnet
ARC156*
22 or 24 AWG, low-capacitance, twisted,
stranded, shielded copper wire
2000 feet (610 meters)
CCN
•
3-conductor
•
18 or 20 AWG stranded tinned copper wire
•
Polyethylene insulation, PVC jacket
•
Shielded with a drain wire
•
Belden wire P#8772 or similar
NOTE
Must meet the above requirements
1000 feet (305 meters)
*
For details see the
Open Controller Network Wiring Guide
.
WARNING
Do not apply line voltage (mains voltage) to the controller's ports and terminals.
To wire the controller to the BACnet MS/TP or ARC156 network
1
Pull the screw terminal connector from the controller's power terminals labeled
24 Vac/26 Vdc
and
Return
(Ground).
2
Check the communications wiring for shorts and grounds.
3
Connect the communications wiring to the controller’s screw terminals labeled
Net +
,
Net -
, and
Shield
.
NOTE
Use the same polarity throughout the network segment.
4
Set the communication type and baud rate.
For...
Set BACnet Mode jumper to...
Set the baud rate...
MS/TP
BACnet MS/TP
See To set a port's baud rate using PuTTY.
ARC156
BACnet ARC156
N/A. Baud rate is automatically set to 156 kbps.
NOTE
Use the same baud rate for all controllers on the network segment.
5
Wire the controllers on a BACnet MS/TP or BACnet ARC156 network segment in a daisy-chain configuration.
6
Install a BT485 on the first and last controller on a network segment to add bias and prevent signal
distortions due to echoing.
