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Introduction

RTU Open v5

CARRIER CORPORATION ©2019

Integration Guide

All rights reserved

3

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.

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Summary of Contents for RTU Open v5

Page 1: ...U 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 1...

Page 2: ...ur 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 tra...

Page 3: ...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 LonWor...

Page 4: ...ts 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 Sta...

Page 5: ...dicator 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 s...

Page 6: ...Introduction RTU Open v5 CARRIER CORPORATION 2019 Integration Guide All rights reserved 2...

Page 7: ...ons 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 bo...

Page 8: ...age 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 net...

Page 9: ...resses 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 16...

Page 10: ...d 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...

Page 11: ...ised 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 n...

Page 12: ...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 pro...

Page 13: ...tches 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 sw...

Page 14: ...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...

Page 15: ...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 sw...

Page 16: ...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 pola...

Page 17: ...per 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 Softwa...

Page 18: ...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 L...

Page 19: ...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 se...

Page 20: ...onfirm 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 boa...

Page 21: ...it unique on the LonWorks network 2 Set the SW3 DIP switches for LonWorks as follows 8 7 6 5 4 3 2 1 Off On On Off On Off Off On 3 Plug the LonWorks Option Card s ribbon cable into Comm Option port J...

Page 22: ...ior to binding the controller s network variables to other LonWorks nodes Troubleshooting LonWorks communication The most common communication problems result from not properly following the configura...

Page 23: ...lable only for BACnet MS TP systems Wire to a BACnet MS TP network connector and a 24 Vac power supply 3 Temporary or permanent interface 1 Requires a USB Link Part USB L 2 See the Equipment Touch Ins...

Page 24: ...ccupancy state Occupied Unoccupied The RTU Open operates continuously in the Occupied mode until you configure an occupancy schedule An occupancy schedule may be A local schedule configured in the con...

Page 25: ...ensor alarm Space Temp Sensor alarm The RTU Open does not include smoke control functions such as smoke purge zone pressurization or smoke ventilation The RTU Open may be configured to accept a Supply...

Page 26: ...imers are employed to protect the equipment from short cycling There are fixed 3 minute minimum on times and 5 minute off times for each compressor output During compressor operation the RTU Open may...

Page 27: ...l modulate to maintain the configured Minimum Cooling SAT limit when the unit is in an economizer only mode and will modulate closed only when the SAT drops below the Minimum Cooling SAT limit 5 F 2 8...

Page 28: ...se If the FDD logic detects a decrease in damper position for example from 80 to 65 it expects to also detect an increase in SAT If the SAT failed to increase or no change in SAT is detected the FDD l...

Page 29: ...ature rises at least 1 F 5 C above the Occupied Cooling Setpoint the supply fan starts The economizer damper opens as necessary to cool the space The RTU Open continues to operate in this mode until t...

Page 30: ...the unit s fan The Optimal Start recovery period may begin as early as 4 hours prior to occupancy The time at which the setpoints move is based on the difference between the current space temperature...

Page 31: ...CO2 is controlled on rooftop equipment with an economizer Indoor Air CO2 sequence is enabled by installing an air quality CO2 sensor A CO2 sensor may be terminated at the RTU Open or a subordinate zon...

Page 32: ...the Maximum Heating SAT setpoint A heat stage turned off in this fashion may be started again after the normal time guard period has expired if the Supply Air Temperature has decreased below the Maxim...

Page 33: ...y described for heating and cooling except that the Y1 and Y2 outputs are compressor outputs energizing mechanical heating or cooling depending on the state of the reversing valve W1 and W2 are used f...

Page 34: ...lls below the active setpoint by a 5 fixed Hysteresis when a humidity sensor is used or when there is no longer a call for dehumidification where a humidistat is used See the base unit Humidi MiZer op...

Page 35: ...A Compressor Safety Alarm is shown on Properties page Control Program tab Alarms and indicates that the equipment requires attention Cooling heating and supply fan outputs are not interrupted except w...

Page 36: ...he RTU Open to monitor the base unit s compressor safety circuit This alarm indicates the base unit s compressor safety circuit is energized Cooling heating and supply fan outputs are not interrupted...

Page 37: ...ty The RTU Open generates a Space Relative Humidity alarm if the space humidity level exceeds the configured low or high alarm limits This alarm is only shown when a valid relative humidity sensor val...

Page 38: ...Fan Service Timer value to 0 disables the supply fan runtime alarm function Compressor 1 Runtime The RTU Open generates this alarm when the accumulated runtime exceeds the Unit Configuration Compresso...

Page 39: ...ng and cooling requirements from all the zones based on their occupancy and demand The VVT Master scans the system continuously to determine if any zones are occupied Occupied zones are a higher prior...

Page 40: ...er ventilation Linkage also provides a safety and system override function during any RTU heating mode Whenever the RTU Open is in a heating mode the control monitors the supply air temperature SAT No...

Page 41: ...all zones modulate airflow to maintain the zone temperature at the appropriate occ unocc cooling setpoint PRESSURIZATION Air source supply fan is on usually as a result of a fire life safety input bei...

Page 42: ...it operation If the problem occurs without the RTU Open connected then the operator should begin troubleshooting the unit equipment rather than the RTU Open or network Third party network may also hel...

Page 43: ...t system errors or control programs halted 5 flashes per second Off Firmware transfer in progress Boot is running 7 flashes per second 7 flashes per second alternating with Run LED Ten second recovery...

Page 44: ...nterference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his...

Page 45: ...BACnet system point is written to the controller uses the network value even when there is a local sensor as long as it is within the Min Max refresh times noted below BACnet writes to system points T...

Page 46: ...lue LonWorks Default Value Recommended Write Rrefresh Time min max System Space Temperature 50 150 F 999 180 F 1 min 5 min System Space RH 1 100 999 15 96 5 min 10 min System Space AQ 200 9999 ppm 999...

Page 47: ...ler Commanded Points Control Points Display Name Type Instance Object Name Display Name Type Instance Object Name System Space Temperature av 1902 system_spt Space Temperature Prime Variable av 2007 s...

Page 48: ...fective Cool Setpoint R F eff_cl_stpt AV 3005 Input Register Float 55 High Space Temperature R 0 Normal 1 Alarm spt_hi_alarm BV 7011 Discrete Input 35 Low Space Temperature R 0 Normal 1 Alarm spt_lo_a...

Page 49: ...ensor R 0 Normal 1 Alarm sprh_sensor_fail BV 7022 Discrete Input 45 Setpoint Adjustment R F stpt_adj AV 1006 Input Register Float 99 Effective Heat Setpoint R F eff_ht_stpt AV 3006 Input Register Floa...

Page 50: ...lative Humidity Setpoint R W rh 95 unocc_dehum_stpt AV 3012 Holding Register Float 129 Setpoint R W F occ_ht_stpt AV 3002 Holding Register Float 19 Supply Air Temp Sensor R 0 Normal 1 Alarm loc_sat_se...

Page 51: ...2 Runtime R 0 Normal 1 Alarm comp2_rntm_alarm BV 7015 Compressor 2 Test R W 0 Disable 1 Enable Inactive 0 comp2_test BV 81004 Compressor Safety Status R 0 Normal 1 Trouble comp_status BV 1008 Continuo...

Page 52: ...10 Humidistat Input Status R 0 High 1 Low humstat_status BV 1006 IGC Override R 0 Off 1 Active igcovr_status BV 1022 Local OAT Sensor R 0 Normal 1 Alarm loc_oat_sensor_fail BV 7003 Occupancy Contact R...

Page 53: ...003 Equipment Status R 1 Disabled 2 Test 3 Run mode_status MSV 2001 Fan Control R W 1 Single Speed 2 Two Speed 3 Variable Speed 3 fan_type MSV 9031 Fan Mode R W 1 Auto 2 Continuous 3 Always On 2 fan_m...

Page 54: ...1 Always Occupied 2 BACnet Schedule 3 BAS On Off 4 Remote Occ Input 1 occ_source MSV 1002 Space sensor type R W 1 T55 2 T56 3 SPT Sensor 4 None 1 spt_type MSV 9001 Space Temp Source R 1 Sensor Failur...

Page 55: ...2017 Min VFD Output R W 40 min_vfd_spd AV 3027 Stage 2 SAT Stpt R W F 57 stg_2_sat AV 83009 slidepot voltage reading R slidepot_volts AI 1012 Filter Runtime R hr filter_rntm AV 2015 Fan Off Delay R W...

Page 56: ...nviDCVMaxPos Space Temperature Prime Variable R F ADF 48 SNVT_temp_p 105 nvoSpaceTemp HP Rev Cycle Lockout Temp R W F 3 ADF 30 SNVT_temp_p 105 nviHPRvClLk System Outdoor Air Temperature R W F 999 ADF...

Page 57: ...1 SNVT_count_inc 9 nviBASOnOff System Space AQ R W ppm 999 ADF 39 SNVT_count_inc 9 nviSysSpAQ System Space RH R W 999 ADF 40 SNVT_lev_percent 81 nviSysSpRH Compressor Status R 0 Normal 1 Alarm BI 30...

Page 58: ...SysEnth Optimal Start R W hr 1 ADF 61 SNVT_count_inc 9 nviOptmStart Power Fail Restart Delay R W seconds 5 ADF 58 SNVT_count_inc 9 nviUntStrDly Indoor Air Quality CO2 ppm R ppm ADF 31 SNVT_ppm 29 nvoI...

Page 59: ...R CORPORATION 2019 Integration Guide All rights reserved 55 The PIC statements are updated regularly Please refer to the BACnet website http www bacnetinternational net catalog index php m 28 for the...

Page 60: ...aud rates Data Bits Parity Stop Bits 2 wire EIA 485 9600 19200 38400 76800 8 None 1 Function Codes Purpose Used with Register Numbers 01 Read Coil Status Read Discrete Outputs 00001 65535 02 Read Inpu...

Page 61: ...Integer UINT 0 65535 3 Read Holding Register 6 Preset Single Register 16 Preset Multiple Register Signed Integer SINT 32768 32767 3 Read Holding Register 6 Preset Single Register 16 Preset Multiple R...

Page 62: ...ls The RTU Open controller speaks the Johnson N2 Open Protocol as described in the Metasys N2 System Protocol Specification for Vendors document revision 6 13 96 Further details on the N2 supported im...

Page 63: ...n Conformance Statement RTU Open v5 CARRIER CORPORATION 2019 Integration Guide All rights reserved 59 Write Binary Output Write Internal Parameter Override Analog Input Override Binary Input Override...

Page 64: ...ernal interface file XIF is also available so that any network management tool can design and configure the RTU Open prior to installation Contact your Carrier representative for this XIF file LonWork...

Page 65: ...ng errors are not listed Date Topic Change description Code 11 19 19 Appendix A Network Points List Third party access to BACnet points in a controller New topic C TS JN E RD 8 29 19 Indoor Air CO2 Co...

Page 66: ...CARRIER CORPORATION 2019 A member of the United Technologies Corporation family Stock symbol UTX Catalog No 11 808 697 01 11 19 2019...

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