Communications wiring
RTU Open v3 Carrier Proprietary and Confidential CARRIER CORPORATION ©2016
Integration Guide All rights reserved
6
Protocols are the communication languages spoken by the control devices. The main purpose of a protocol is to
communicate information in the most efficient method possible. Different protocols exist to provide specific
information for different applications.
In the BAS application, many different protocols are used, depending on manufacturer. Different protocols do not
change the function of the controller, but they typically require the owner to change systems or components in
order to change from one protocol to another. The RTU Open is an effective solution to minimize the amount of
controllers that you may need to change in order to communicate with different types of protocols.
You can set the controller to communicate 1 of 4 different protocols:
• BACnet MS/TP (page 7)
• Modbus (page 9)
• N2 (page 12)
• LonWorks (page 14)
The default setting is BACnet MS/TP. Switch 3 (
) on the board sets protocol and baud rate. Switches
(
) and
(
) set the board’s network address. See table below for specific switch settings. The third
party connects to the controller through port
for BACnet MS/TP, Modbus, and N2, and through
for the
LonWorks Option Card.
• Changing protocol requires no programming or point assignment by the installer or operator.
• Power must be cycled after changing the
(
) -
(
) settings or connecting the LonWorks Option
Card to
.
SW3 Switch Settings Table
(Default)
Master Unused Off Off Off On Off Select Baud Select Baud
Slave Unused Off Off On On Off Select Baud Select Baud
Slave Unused Off Off Off On On Off Off
Unused On On Off On Off Off On
Off Off
On Off
Off On
(Default) On On
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