Carrier RTU Open v5 Quick setup guide

R
RT TU U O Op pe en n v v5 5
I
In nt te eg gr ra at ti io on n G Gu ui id de e
CARRIER CORPORATION ©2019
A member of the United Technologies Corporation family · Stock symbol UTX · Catalog No. 11-808-697-01 · 11/19/2019

Verify that you have the most current version of this document from www.hvacpartners.com or your local Carrier
office.
Important changes are listed in Document revision history at the end of this document.
CARRIER CORPORATION ©2019. All rights reserved throughout the world. i-Vu is a registered trademark of Carrier
Corporation. All other trademarks are the property of their respective owners.

Contents
Introduction.................................................................................................................................................................. 1
What is the RTU Open controller? ......................................................................................................................1
Safety considerations & handling warning.......................................................................................................3
Communications wiring .............................................................................................................................................. 4
Protocol overview..................................................................................................................................................4
BACnet MS/TP ......................................................................................................................................................5
To set up the RTU Open for BACnet MS/TP ......................................................................................... 5
Adjusting BACnet MS/TP properties using an Equipment Touch ....................................................... 6
Troubleshooting BACnet MS/TP communication ................................................................................ 8
BACnet ARC156....................................................................................................................................................9
To set up the RTU Open for BACnet ARC156 ...................................................................................... 9
Troubleshooting ARC156 communication .........................................................................................10
Modbus................................................................................................................................................................ 11
To set up the RTU Open for Modbus ..................................................................................................11
Troubleshooting Modbus communication .........................................................................................12
Johnson N2 ......................................................................................................................................................... 14
To set up the RTU Open for N2...........................................................................................................14
Troubleshooting N2 communication..................................................................................................15
LonWorks ............................................................................................................................................................ 16
To set up the RTU Open for the LonWorks Option Card (Part #LON-OC) .........................................17
Commissioning the controller for LonWorks communication...........................................................18
Troubleshooting LonWorks communication ......................................................................................18
Start-up.......................................................................................................................................................................19
Sequence of Operation .............................................................................................................................................20
Occupancy........................................................................................................................................................... 20
Supply fan ........................................................................................................................................................... 21
Cooling................................................................................................................................................................. 22
Economizer ......................................................................................................................................................... 23
Power Exhaust.................................................................................................................................................... 24
Pre-Occupancy Purge ........................................................................................................................................ 24
Unoccupied Free Cooling .................................................................................................................................. 25
Optimal Start ...................................................................................................................................................... 25
Enthalpy control ................................................................................................................................................. 27
Indoor Air CO2 .................................................................................................................................................... 27
Heating ................................................................................................................................................................ 28
Supply Air Tempering ........................................................................................................................................ 28
Heat Pump operation........................................................................................................................................ 29
Dehumidification ............................................................................................................................................... 30
Demand Limiting ............................................................................................................................................... 30
Door switch ......................................................................................................................................................... 30
Remote Occupancy ........................................................................................................................................... 31
Fire Shutdown .................................................................................................................................................... 31
Compressor Safety ............................................................................................................................................ 31
Fan Status........................................................................................................................................................... 31
Filter status......................................................................................................................................................... 32
Alarms ................................................................................................................................................................. 32
Linkage................................................................................................................................................................ 34
Linkage air source mode determination........................................................................................................ 36
Troubleshooting .........................................................................................................................................................38
LED's .................................................................................................................................................................... 38
Compliance ................................................................................................................................................................40

Contents
FCC Compliance................................................................................................................................................. 40
BACnet Compliance........................................................................................................................................... 40
CE Compliance ................................................................................................................................................... 40
Appendix A: Network Points List for RTU Open ......................................................................................................41
Third party access to BACnet points in a controller ..................................................................................... 41
Network points list for BACnet and Modbus ................................................................................................. 44
Network points list for N2 and LonWorks...................................................................................................... 52
Appendix B: BACnet Protocol Implementation Conformance Statement ...........................................................55
Appendix C: Modbus Protocol Implementation Conformance Statement...........................................................56
Appendix D: Johnson N2 Protocol Implementation Conformance Statement ....................................................58
Appendix E: LonWorks Protocol Implementation Conformance Statement .......................................................60
Document revision history ........................................................................................................................................61

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1
What is the RTU Open controller?
The RTU Open controller (part# OPN-RTUM2) is available as an integrated component of a Carrier rooftop unit, or
as a field-installed retrofit product.
NOTE The RTU Open controller is available in both English or Metric units. The metric version has (-M) appended
to the part number. Everything in this document applies to both versions.
Its internal application programming provides optimum rooftop performance and energy efficiency. RTU Open
enables the unit to run in 100% stand-alone control mode or it can communicate to the Building Automation
System (BAS).
The RTU Open supports the following:
ZS and Carrier wireless sensors - Models are available for monitoring space temperature, space relative
humidity, and space IAQ/CO2. Sensors provide:
○Space setpoint offset adjustment
○Pushbutton override
○Occupancy indicator
BACnet and third party protocols - On-board DIP switches allow you to select the baud rate and choose one of
the following protocols:
○BACnet MS/TP
○BACnet ARC156
○Modbus
○Johnson N2
○LonWorks
Mixed systems - Supports CCN air terminals using Linkage to BACnet RTU Open Air Source
California Title 24 - Includes advanced Fault Detection and Diagnostic Logic for Economizer Operation in
accordance with California Title 24 requirements
Equipment Touch - The Equipment Touch is a user interface that is a touchscreen device with a 4.3 in. color
LCD display that you connect to the RTU Open (driver v6.00:082 or later) to view or change property values,
equipment schedules, trends and alarms, and more, without having to access the system's i-Vu® server.
The RTU Open’s application supports detailed color graphics, status, properties, alarms, trends, performance,
configuration, and Help on the Equipment Touch. In addition, an RTU Open Startup Wizard has specific
screens to facilitate initial RTU Open configuration.
For more details about the Equipment Touch, see the Equipment Touch Installation and Setup Guide.
Introduction

Introduction
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Introduction
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Safety considerations & handling warning
WARNING
When you handle the RTU Open:
•Do not contaminate the printed circuit board with fingerprints, moisture, or any foreign material.
•Do not touch components or leads.
•Handle the board by its edges.
•Isolate from high voltage or electrostatic discharge.
•Ensure that you are properly grounded.

Communications wiring
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Protocol overview
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, many different protocols might be 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. communicates different types of protocols.
The RTU Open can communicate 1 of 5 different protocols:
BACnet MS/TP (page 5)
BACnet ARC156 (page 9)
Modbus (page 11)
Johnson N2 (page 14)
LonWorks (page 16)
The default setting is BACnet MS/TP. You set the protocol and baud rate using the SW3 DIP switches. The rotary
switches MSB (SW1) and LSB (SW2) set the board’s network address. See table below for specific switch settings.
The third party connects to the controller through port J19 for BACnet MS/TP, BACnet ARC156, Modbus, and N2,
and through J15 for the LonWorks Option Card.
NOTE You must cycle power after changing the rotary switches or after connecting the LonWorks Option Card to
J15.
SW3 DIP switch settings
Unused
Comm
Option port
Protocol
Baud rate
8
7
6
5
4
3
2
1
BACnet MS/TP
(Default)
Master
N/A
Off
Off
Off
On
Off
Select Baud
Select Baud
BACnet ARC156
N/A
Off
Off
Off
Off
Off
N/A
N/A
Modbus
Slave
N/A
Off
Off
On
On
Off
Select Baud
Select Baud
N2
Slave
N/A
Off
Off
Off
On
On
Off
Off
Lonworks
N/A
On
On
Off
On
Off
Off
On
Baud DIP switch settings
Baud Rate
DIP switch 2
DIP switch 1
9,600 bps
Off
Off
19.2 kbps
On
Off
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38.4 kbps
Off
On
76.8 kbps (Default)
On
On
BACnet MS/TP
To set up the RTU Open for BACnet MS/TP
Refer to Appendix B (page 55) for the Protocol Implementation Conformance Statement, or download the latest
from BACnet International http://www.bacnetinternational.net/catalog/index.php?m=28.
NOTE This controller counts as a full load on the MS/TP bus.
1 Turn off the RTU Open's power.
NOTE Changes made to the switches when the controller is on will not take effect until the power is cycled!
2 Using the rotary switches MSB (SW1) and LSB (SW2), set a unique BACnet MS/TP MAC address for the RTU
Open. Set the MSB (SW1) switch to the tens digit of the address, and set the LSB (SW2) switch to the ones
digit. Valid addresses are 01-99.
NOTE The rotary switches also determine the BACnet device instance of the controller on the BACnet
network. The BACnet device instance is automatically generated based on the scheme 16101xx, where “16”
is the BACnet vendor ID for Carrier Corporation, and xx equals the rotary switch address.
EXAMPLE To set the controller’s MS/TP MAC address to 01, point the arrow on the MSB (SW1) switch to 0
and the arrow on the LSB (SW2) switch to 1. Internally, the BACnet device instance is automatically
generated as 1610101.
10's 1's
1
3
4
5
2
7
8
9
6
0
1
3
4
5
2
7
8
9
6
0
SW1 SW2
M S B L S B
3 Set the SW3 DIP switches 1 and 2for the appropriate communications speed (9600, 19.2k, 38.4k, or 76.8k
bps).
NOTE Use the same baud rate and communication settings for all controllers on the network segment. The
RTU Open is fixed at 8 data bits, No Parity, and 1 Stop bit for this protocol's communications.
Baud DIP switch settings
Baud rate
2
1
9,600 bps
Off
Off
19.2 kbps
On
Off
38.4 kbps
Off
On
76.8 kbps
On
On

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4 Set the remaining DIP switches as follows:
BACnet MS/TP DIP switch settings
8
7
6
5
4
3
Off
Off
Off
Off
On
Off
The following example shows the DIP switches set for 76.8k (Carrier default), and BACnet MS/TP.
5 Connect the BACnet MS/TP network to the controller's J19 Network Comm port. Connect to Net+, Net-, and
SHLD.
Wire specifications
○A dedicated 22 AWG shielded twisted pair wire (EIA 485)
○Maximum wire length 2000 feet (610 meters) or 32 nodes
○Devices should be daisy-chained and not star-wired
○Attach the drain/shield wire to both ends of the network segment and through every controller
NOTE Use the same polarity throughout the network segment.
6 Turn on the RTU Open's power.
Adjusting BACnet MS/TP properties using an Equipment Touch
You may need to adjust the following BACnet MS/TP protocol timing settings using the Equipment Touch.
Max Masters - defines the highest MS/TP Master MAC address on the MS/TP network.
For example, if there are 3 master nodes on an MS/TP network, and their MAC addresses are 1, 8, and 16, then
Max Masters would be set to 16 (since this is the highest MS/TP MAC address on the network).
This property optimizes MS/TP network communications by preventing token passes and “poll for master”
requests to non-existent Master nodes.

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In the above example, MAC address 16 knows to pass the token back to MAC address 1, instead of counting up to
MAC address 127. Each MS/TP master node on the network must have their Max Masters set to this same value.
The default is 127.
Max Info Frames - defines the maximum number of responses that will be sent when the RTU Open receives the
token. The default is 10 and should be ideal for the majority of applications. In cases where the RTU Open is the
target of many requests, this number could be increased as high as 100 or 200.
NOTES
BACnet MS/TP networks can be comprised of both master and slave nodes. Valid MAC addresses for master
nodes are 0 –127 and valid addresses for Slave nodes are 0 - 254.
If the third party attempts to communicate to the controller but does not get a response, make sure the
controller is set as a BACnet MS/TP (m) master. The BACnet software asks the controllers, “Who Is?” This is
to auto-locate devices on the network. Only controllers set as masters will answer this request.
See Appendix A for Network Points List.
See Appendix B (page 55) for the BACnet Protocol Implementation Conformance Statement (PICS).
To set the Device Instance number or adjust the Max Masters or Max Info Frames using an Equipment Touch
1 In the Equipment Touch interface, navigate to the Properties Menu screen and click Login.
NOTE The following graphic is generic and not specific to your system.
2 Type Touch for the password and click Done.

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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.

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NOTES
The controller recognizes physical changes (DIP switches, rotary switches, and jumpers) upon power up.
If RX LED is solid, then the terminations are incorrect.
If the network has greater than 32 devices or exceeds 2,000 feet, a Repeater should be installed.
If a controller begins or ends a network segment, a terminating resistor may be needed.
BACnet ARC156
To set up the RTU Open for BACnet ARC156
The RTU Open’s latest supported function codes and capabilities are listed on the associated Protocol
Implementation Conformance Statement (PICS), Carrier BACnet PICS website
http://www.bacnetinternational.net/catalog/index.php?m=28.
1 Turn off the RTU Open's power.
NOTE Changes made to the switches when the controller is on will not take effect until the power is cycled!
2 Using the rotary switches MSB (SW1) and LSB (SW2), set a unique BACnet MS/TP MAC address for the RTU
Open. Set the MSB (SW1) switch to the tens digit of the address, and set the LSB (SW2) switch to the ones
digit. Valid addresses are 01-99.
NOTE The rotary switches also determine the BACnet device instance of the controller on the BACnet
network. The BACnet device instance is automatically generated based on the scheme 16101xx, where “16”
is the BACnet vendor ID for Carrier Corporation, and xx equals the rotary switch address.
EXAMPLE To set the controller’s MAC address to 01, point the arrow on the MSB (SW1) switch to 0 and the
arrow on the LSB (SW2) switch to 1. Internally, the BACnet device instance is automatically generated as
1610101.
10's 1's
1
3
4
5
2
7
8
9
6
0
1
3
4
5
2
7
8
9
6
0
SW1 SW2
M S B L S B
3 Set the remaining DIP switches as follows:
BACnet ARC156 DIP switch settings
8
7
6
5
4
3
Off
Off
Off
Off
N/A
N/A

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The following example shows the DIP switches set for BACnet ARC156.
4 Connect the BACnet ARC156 network to the controller's J19 Network Comm port. Connect to Net+, Net-, and
SHLD.
Wire specifications
○A dedicated 22 AWG shielded twisted pair wire (EIA 485)
○Maximum wire length 2000 feet (610 meters) or 32 nodes
○Devices should be daisy-chained and not star-wired
○Attach the drain/shield wire to both ends of the network segment and through every controller
NOTE Use the same polarity throughout the network segment.
5 Turn on the RTU Open's power.
Troubleshooting ARC156 communication
The most common communication problems result from not properly following the configuration steps outlined
above in this manual. Review all of the steps and use the following list to check your settings.
Verify accuracy of the following:
Protocol DIP switches DS3 - DS6
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.
NOTES
The controller recognizes physical changes (DIP switches, rotary switches, and jumpers) upon power up.
If RX LED is solid, then the terminations are incorrect.

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If the network has greater than 32 devices or exceeds 2,000 feet, a Repeater should be installed.
If a controller begins or ends a network segment, a terminating resistor may be needed.
Software settings defined through the Equipment Touch device. To confirm settings, obtain a Modstat of the
device. On the Equipment Touch, click the link to the Modstat.
Modbus
To set up the RTU Open for Modbus
Refer to Appendix C (page 56) for the Modbus Protocol Implementation Conformance Statement (PICS).
1 Turn off the RTU Open's power.
NOTE Changes made to the switches when the controller is on will not take effect until the power is cycled!
2 Using the rotary switches, set a unique Modbus slave address for the RTU Open. Set the MSB (SW1) switch to
the tens digit of the address, and set the LSB (SW2) switch to the ones digit. Valid Modbus slave addresses
are 01-99.
EXAMPLE To set the controller's Modbus slave address to 01, point the arrow on the MSB (SW1) switch to 0
and the arrow on the LSB (SW2) switch to 1.
10's 1's
1
3
4
5
2
7
8
9
6
0
1
3
4
5
2
7
8
9
6
0
SW1 SW2
M S B L S B
3 Set the SW3 DIP switches 1 and 2for the appropriate communications speed (9600, 19.2k, 38.4k, or 76.8k
bps).
NOTE Use the same baud rate and communication settings for all controllers on the network segment. The
RTU Open is fixed at 8 data bits, No Parity, and 1 Stop bit for this protocol's communications.
Baud DIP switch settings
Baud rate
2
1
9,600 bps
Off
Off
19.2 kbps
On
Off
38.4 kbps
Off
On
76.8 kbps
On
On

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4 Set the remaining DIP switches as follows:
Modbus DIP switch settings
8
7
6
5
4
3
Off
Off
Off
On
On
Off
The following example shows the DIP switches set for 9600 baud and Modbus.
5 Connect the Modbus EIA-485 network to the RTU Open's J19 Network Comm port. Connect to Net+, Net-,
and SHLD.
Wire specifications
○A dedicated 22 AWG shielded twisted pair wire (EIA 485)
○Maximum wire length 2000 feet (610 meters) or 32 nodes
○Devices should be daisy-chained and not star-wired
○Attach the drain/shield wire to both ends of the network segment and through every controller
NOTE Use the same polarity throughout the network segment.
6 Turn on the RTU Open's power.
Troubleshooting Modbus communication
The most common communication problems result from not properly following the configuration steps outlined
above 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 speaking Modbus (8 Data bits, No Parity, and 1 Stop bit):
Baud rate DIP switches DS2 and DS1
Protocol DIP switches DS3 - DS6

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Proper connection wiring
Wiring specifications are 18 - 28 AWG; twisted pair, and 50 feet (15.4 meters) maximum
Unique rotary address switches 1 –99. If controllers have duplicate addresses, network communication can
be lost.
NOTES
If RX LED is solid, then the terminations are incorrect.
If the network has greater than 32 devices or exceeds 2,000 feet, a Repeater should be installed.
If a controller begins or ends a network segment, a terminating resistor may be needed.
The controller recognizes physical changes (DIP switches, rotary switches, and jumpers) upon power up.
BAS must be:
Set for the same baud rate
Sending requests to the proper address
Reading or writing to the proper point addresses on the controller
Set for the same communication settings (8 Data bits, No Parity, and 1 Stop bit)
Speaking 2-wire 485 to the controller
Software settings defined through the Equipment Touch device. To confirm settings, obtain a Modstat of the
device. On the Equipment Touch, click the link to the Modstat.
NOTES
Refer to Appendix A (page 41) for the Network Points list.
Refer to Appendix C (page 56) for the Protocol Implementation Conformance Statement.
Modbus Exception Codes that might be returned from this controller
Codes
Name
Description
01
Illegal Function
The Modbus function code used in the query is not
supported by the controller.
02
Illegal Data
Address
The register address used in the query is not supported
by the controller.
04
Slave Device
Failure
The Modbus Master has attempted to write to a non-
existent register or a read-only register in the
controller.

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Johnson N2
To set up the RTU Open for N2
Refer to Appendix D (page 58) for the N2 Protocol Implementation Conformance Statement (PICS).
1 Turn off the RTU Open's power.
NOTE Changes made to the switches when the controller is on will not take effect until the power is cycled!
2 Using the rotary switches, set a unique N2 slave address for the RTU Open. Set the MSB (SW1) switch to the
tens digit of the address, and set the LSB (SW2) switch to the ones digit. Valid N2 slave addresses are 01-99.
EXAMPLE To set the N2 slave address to 01, point the arrow on the MSB (SW1) switch to 0 and the arrow on
the LSB (SW1) switch to 1.
10's 1's
1
3
4
5
2
7
8
9
6
0
1
3
4
5
2
7
8
9
6
0
SW1 SW2
M S B L S B
3 Set the DIP switches 1 and 2for 9600 bps baud.
NOTE Use the same baud rate and communication settings for all controllers on the network segment. The
RTU Open is fixed at 9600 bps baud, 8 data bits, No Parity, and 1 Stop bit.
4 Set the remaining DIP switches as follows:
N2 DIP switch settings
8
7
6
5
4
3
2
1
Off
Off
Off
Off
On
On
On
On
The following example shows the DIP switches set for 9600 baud and N2.

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5 Connect the N2 EIA-485 network to the controller's J19 Network Comm port. Connect to Net+, Net-, and
SHLD.
Wire specifications
○A dedicated 22 AWG shielded twisted pair wire (EIA 485)
○Maximum wire length 2000 feet (610 meters) or 32 nodes
○Devices should be daisy-chained and not star-wired
○Attach the drain/shield wire to both ends of the network segment and through every controller
NOTE Use the same polarity throughout the network segment.
6 Turn on the RTU Open's power.
Troubleshooting N2 communication
The most common communication problems result from not properly following the configuration steps outlined
above 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 N2 (8 Data bits, No Parity, and 1 Stop bit):
Baud rate DIP switches DS2 and DS1 set to 9600 bps
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.
NOTES
If RX LED is solid, then the terminations are incorrect.
If the network has greater than 32 devices or exceeds 2,000 feet, a Repeater should be installed.
If a controller begins or ends a network segment, a terminating resistor may be needed.
The controller recognizes physical changes (DIP switches, rotary switches, and jumpers) upon power up.

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Refer to Appendix A (page 41) for the Network Points list.
Refer to Appendix D (page 58) for the Protocol Implementation Conformance Statement.
Software settings defined through the Equipment Touch device. To confirm settings, obtain a Modstat of the
device. On the Equipment Touch, click the link to the Modstat.
LonWorks
WARNING
When you handle the LonWorks Option Card:
Do not contaminate the printed circuit board with fingerprints, moisture, or any foreign material.
Do not touch components or leads.
Handle the board by its edges.
Isolate from high voltage or electrostatic discharge.
Ensure that you are properly grounded.
Refer to Appendix E (page 60) for the LonWorks Protocol Implementation Conformance Statement (PICS).