Wiring For Communications; Wiring Specifications For Bacnet Ms/Tp And Arc156; To Wire The Controller To The Bacnet Network - Carrier Zone Ctrl II Installation And Startup Manual

Wiring for communications

The Zone Ctrl II 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 BACnet network

WARNING Attaching any ARCNET or MS/TP network to the Act Net port damages BT485s, DIAG485s, or
terminating resistors on that network.
1
Pull the screw terminal connector from the controller's power terminals labeled Gnd and 24 Vac.
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...
ARC156
MS/TP
NOTE Use the same baud rate for all controllers on the network segment.
Zone Ctrl II and
VAV Zone II Secondary Duct Installation and Start-up Guide
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22 AWG or 24 AWG, low-capacitance, twisted, stranded, shielded copper wire
2000 feet (610 meters)
Set BACnet ARC156 or
MS/TP
jumper to...
ARC156
MS/TP
Set DIP switches 1 and 2 to...
N/A. Baud rate will be 156 kbps regardless of
the DIP switch settings.
The appropriate baud rate. See the MS/TP
Baud diagram on the controller.
15
Installing the Zone Ctrl II
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