Wiring For Communications; Wiring Specifications For Bacnet Ms/Tp And Arc156; To Wire The Controller To The Network - Carrier i-Vu MPC Open XP IO48/816 Installation And Startup Manual

Wiring for communications

The MPC Open XP communicates using BACnet on the following types of network segments:
•
MS/TP communicating at 9600 bps, 19.2 kbps, 38.4 kbps, or 76.8 kbps
•
ARC156 communicating at 156 kbps
NOTE For more networking details, see the Open Controller Network Wiring Installation Guide.

Wiring specifications for BACnet MS/TP and ARC156

Cable:
Maximum length:
WARNING Do not apply line voltage (mains voltage) to the controller's ports and terminals.

To wire the controller to the 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...
MS/TP
ARC156
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.
MPC Open XP
MPC Open XP IO48/816
Installation and Start-up Guide
22 AWG or 24 AWG, low-capacitance, twisted, stranded, shielded copper wire
2000 feet (610 meters)
Set BACnet Mode jumper to...
BACnet MS/TP
BACnet ARC156
Carrier Proprietary and Confidential
Set DIP switches 7 and 8 to...
The appropriate baud rate. See the BACnet MS/TP
Baud diagram on the controller.
N/A. Baud rate will be 156 kbps regardless of the DIP
switch settings.
9
Installing the MPC Open XP
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