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Installing the RTU Open
RTU Open v3
CARRIER CORPORATION ©2019
Installation and Start-up Guide
All rights reserved
12
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:
22 AWG or 24 AWG, low-capacitance, twisted, stranded, shielded copper wire
Maximum length:
2000 feet (610 meters)
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...
Set DIP switches 1 and 2 to...
Set DIP switch 4 to...
MS/TP
The appropriate baud rate. See the
MS/TP Baud
diagram
on the controller.
On
ARC156
N/A. Baud rate will be 156 kbps regardless of the DIP
switch settings.
Off
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.
Summary of Contents for RTU Open v3
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