Communications wiring
RTU Open v5
CARRIER CORPORATION ©2019
Integration Guide
All rights reserved
8
3
On the
Properties Menu
screen, scroll to the bottom of the list and click
ET System
.
4
On the
ET System
screen, click
Setup
.
5
On the
Setup
screen, click
Module Setup
.
6
On the
Module Setup
screen, click
Communication
.
On the
Communication
screen, edit the fields as needed:
7
Click the property box next to
BACnet Device Instance
, type the new number, and click
Done
.
8
Click the property box next to
Max Masters
and/or
Max Info Frames
, type a new value (1-127), and click
Done
.
9
Click
Save
.
Troubleshooting BACnet MS/TP communication
For detailed troubleshooting and a list of supported objects, get the controller's BACnet PICS from the
Carrier
BACnet PICS website
http://www.bacnetinternational.net/catalog/index.php?m=28
. You must get your BACnet
Object list from the manufacturer.
The most common communication problems are the result of not properly following the configuration steps
outlined in this manual. Review all of the steps and use the following list to check your settings.
Verify accuracy of the following:
Hardware settings
for BACnet MS/TP (8 Data bits, No Parity, and 1 Stop bit):
Baud rate DIP switches DS2 and DS1
BACnet MS/TP protocol DIP switches DS3 - DS6
Jumper set to EIA-485
Proper connection wiring
Unique rotary address switches 1 – 99. If controllers have duplicate addresses, network communication can
be lost.
Unique BACnet Device Instance numbers. Default is 16101XX, with the rotary address switches defining XX. If
controllers have duplicate device instance numbers, network communication can be lost.