Wiring For Communications; Wiring Specifications For Bacnet Ms/Tp And Arc156; To Wire The Controller To The Bacnet Network - Carrier RTU Open v3 Installation And Startup Manual

Installing the RTU Open

Wiring for communications

The RTU Open 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

1
Pull the terminal connectors from the RTU Open's power terminals.
2
Check the communications wiring for shorts and grounds.
3
Connect the communications wiring to the Network Comm J19 port'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
If the RTU Open is at either end of a network segment, connect a BT485 to the RTU Open.
7
Insert the power screw terminal connector into the RTU Open's power terminals.
8
Verify communication with the network by viewing a Module Status report in the i-Vu® interface.
RTU Open v3
Installation and Start-up Guide
22 AWG or 24 AWG, low-capacitance, twisted, stranded, shielded copper wire
2000 feet (610 meters)
Set DIP switches 1 and 2 to...
The appropriate baud rate. See the MS/TP Baud diagram
on the controller.
N/A. Baud rate will be 156 kbps regardless of the DIP
switch settings.
12
Set DIP switch 4 to...
On
Off
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