BACnet and Modbus RTU Communication …

1 BAS-SVP022A-GBBACnet and Modbus RTUC ommunication Interfacesfor trane Chillers with Tracer UC800 ControlIntegration GuideOriginal instructionsOnly qualifi ed personnel should install and service the equipment. The installation, starting up, and servicing of heating, ventilating, and air-conditioning equipment can be hazardous and requires specifi c knowledge and training. Improperly installed, adjusted or altered equipment by an unqualifi ed person could result in death or serious injury. When working on the equipment, observe all precautions in the literature and on the tags, stickers, and labels that are attached to the of ContentsBAS-SVP022A-GB2 2014 TraneOverview .. 5 Tracer UC800 Controller Rotary Switches .. 6 Equivalent Data Points Reference List for RTHD Evo and RTAF Chillers: BACnet , Modbus RTU .. 7 BACnet Data Points and Confi guration Property Defi nitions .. 13 Modbus RTU Data Points and Confi guration Property Defi nitions .. 18 Additional Resources .. 21 Glossary .. 22 BAS-SVP022A-GB3 BAS-SVP022A-GB4 CopyrightAll rights reserved.

2 This document and the information in it are the property of trane and may not be used or reproduced in whole or in part, without the written permission of trane . trane reserves the right to revise this publication at any time and to make changes to its content without obligation to notify any person of such revision or and its logo are trademarks of trane . All trademarks referenced in this document are the trademarks of their respective , Cautions and NoticesWarning, cautions and notices are provided in appropriate places throughout this document:Warning!Indicate a potentially hazardous situation which, if not avoided, could result in death or serious !Indicates a potentially hazardous situation which, if not avoided, could result in minor or moderate injury. It could also be used to alert against unsafe !Indicates a situation that could result in equipment or property - damage - only provides the capability for building control systems or devices from multiple vendors to communicate with each other through open, standard protocols.

3 trane has adopted open, standard interoperable protocols to give customers the fl exibility to choose the best possible vendor for their building subsystems and easily incorporate trane products into legacy systems in existing buildings. This guide will provide: A brief overview of two of these protocols supported by trane BACnet and Modbus Remote Terminal Unit (RTU) An equivalent listing of data points for both protocols for RTHD Evo and RTAF chillers BACnet / Modbus RTU addressing BACnet / Modbus RTU data points and confi guration property defi nitions Additional resources Glossary of termsNote: Users of this guide should have basic knowledge of BACnet / Modbus protocols. For more detailed information about these protocols, visit these company s web sites listed under Additional Resources . BACnet ProtocolThe Building Automation and Control Network ( BACnet and ANSI/ASHRAE Standard 135-2004) protocol is a standard that allows building automation systems or components from different manufacturers to share information and control functions.

4 BACnet provides building owners the capability to connect various types of building control systems or subsystems together for a variety of reasons. In addition, multiple vendors can use this protocol to share information for monitoring and supervisory control between systems and devices in a multi-vendor interconnected system. The BACnet protocol identifi es standard objects (data points) called BACnet objects. Each object has a defi ned list of properties that provide information about that object. BACnet also defi nes a number of standard application services that are used to access data and manipulate these objects and provides a client/server Communication between Testing Laboratory (BTL) Certifi cationAll Tracer UC800 controllers are designed to support BACnet Communication protocol. In addition, some particular revisions of the UC800 fi rmware have been tested and have achieved BTL certifi cation by an offi cial BACnet testing laboratory. For more details, refer to the BTL website at: Modbus RTU ProtocolModicon Communication Bus ( Modbus ) is an application layer-messaging protocol that, like BACnet , provides client/server Communication between devices over a variety of networks.

5 During communications on a Modbus RTU network, the protocol determines how each controller will know its device address, recognize a message addressed to its device, determine what action to take, and extract any data or other information contained in the message. Controllers communicate using a master/slave technique, whereby, only one device (master) can initiate transactions (queries). Other devices (slaves) respond by supplying the requested data to the master or by taking the action requested in the master can address individual slaves or it can initiate a broadcast message to all slaves. In turn, the slaves respond to queries that are addressed to them individually or broadcasted. The Modbus RTU protocol establishes the format for the master s query by placing into it the device address, a function code defi ning the requested action, any data to be sent, and an error-checking fi section provides information about the Tracer UC800 controller rotary switches and LED InterfacesThe UC800 supports the Communication interfaces listed below.

6 There is one set of terminations (link) for BACnet and Modbus . LonTalk and Comm 4 Communication interfaces connect to the IPC3 bus which is the MBUS connection. BACnet MS / TP Modbus Slave LonTalk using LCI-C (fromtheIPC3bus) Note: Refer to Additional Resources . Comm4 using TCI (from the IPC3 bus)Rotary SwitchesThere are three rotary switches on the front of the UC800. See Figure 1. Use these switches to defi ne a three-digit address when the UC800 is installed in a BACnet or Modbus RTU system (for example, 107, 127, and so on). Note: Valid MAC addresses are 001 to 127 for BACnet and 001 to 247 for Modbus RTU. For additional information about setting higher addresses, refer to Device ID .LED Description and OperationThere are 10 LEDs on the front of the UC800. Figure 1 shows the locations of each LED and a description of its behavior in specifi c 1 - LED locationsSERVICE TOOLSERVICEIMCMBUSLINKRXTXACTLINKUC800 MBUSLINK+24 VDCIMC1 IMCUSBADDRESS0123456789x10123456789x1001 23456789x100 SERVICEIMCMBUSLINKRXTXACTLINKM arquee LED Shows solid green when the UC800 is powered and operating normally.

7 Shows solid red when the UC800 is powered, but represents low power or a malfunction. Blinks red when an alarm , MBUS, IMC The TX LED blinks green at the data transfer rate when the UC800 transfers data to other devices on the link. The RX LED blinks yellow at the data transfer rate when the UC800 receives data from other devices on the link. Ethernet Link The LINK LED shows solid green if the Ethernet link is connected and communicating. The ACT LED blinks yellow at the data transfer rate when data fl ow is active on the link. SERVICE Shows solid green when pressed.(For more details, refer to the document, Installation, Operation, and Maintenance Guide for Chillers (RTHD Evo RTAF) with Tracer UC800 Control listed in the section, Additional Resources .Tracer UC800 Controller Rotary SwitchesBAS-SVP022A-GB7 The following table provides a quick reference to equivalent data point objects names for RTWD and RTAF chillers when using either BACnet or Modbus RTU communications.)

8 This table is sorted alphabetically by data point : The information contained in the following table is for versions and higher. For version , refer to BACnet and Modbus RTU Communications Interfaces for trane Chillers with Tracer UC800 Control Integration Point Objet NameBACnet ObjetModbus RTU RegisterRTHDRTAFA ctive Chilled Water SetpointAI 130003 XXFront Panel Chilled Water SetpointAI 230004 XXEvaporator Entering Water TemperatureAI 330005 XXEvaporator Leaving Water TemperatureAI 430006 XXActive Current Limit SetpointAI 530007 XXFront Panel Current Limit SetpointAI 630008 XXUnit Power ConsumptionAI 730009 XXOutdoor Air TemperatureAI 830010 XXExternal Chilled Water SetpointAI 930011 XXExternal Current Limit SetpointAI 1030012 XXEvaporator Refrigerant Pressure Ckt1AI 1130013 XXCondenser Refrigerant Pressure Ckt1AI 1230014 XXDifferential Refrigerant Pressure Ckt1AI 1330015 XXEvaporator Saturated Rfgt Temp Ckt1AI 1430016 XXCondenser Saturated Rfgt Temp Ckt1AI 1530017 XXEvaporator Refrigerant Pressure Ckt2AI 1630018 XCondenser Refrigerant Pressure Ckt2AI 1730019 XDifferential Refrigerant Pressure Ckt2AI 1830020 XEvaporator

9 Saturated Rfgt Temp Ckt2AI 1930021 XCondenser Saturated Rfgt Temp Ckt2AI 2030022 XDischarge Temperature Cprsr1 AAI 2130023 XXOil Pressure Cprsr1 AAI 2230024 XXOil Temperature Cprsr1 AAI 2330025 XXDischarge Temperature Cprsr2 AAI 2430026 XOil Pressure Cprsr2 AAI 2530027 XOil Temperature Cprsr2 AAI 2630028 XAir Flow Ckt1AI 3030032 Air Flow Ckt2AI 3130033 Starts Cprsr1 AAI 3530035/36 XXRun Time Cprsr1 AAI 3630037/38 XXMotor Voltage Phase AB Cprsr1 AAI 3730039 XXMotor Voltage Phase BC Cprsr1 AAI 3830040 XXMotor Voltage Phase CA Cprsr1 AAI 3930041 XXMotor Current A Cprsr1 AAI 4030042 XXMotor Current B Cprsr1 AAI 4130043 XXMotor Current C Cprsr1 AAI 4230044 XXMotor % RLA A Cprsr1 AAI 4330045 XXMotor % RLA B Cprsr1 AAI 4430046 XXEquivalent Data Points Reference List for RTHD Evo and RTAF Chillers: BACnet , Modbus RTUBAS-SVP022A-GB8 Data Point Objet NameBACnet ObjetModbus RTU RegisterRTHDRTAFM otor % RLA C Cprsr1 AAI 4530047 XXAverage Motor Current % RLA AFD 1 AAI 4630048 XStarts Cprsr2 AAI 5130051/52 XRun Time Cprsr2 AAI 5230053/54 XMotor Voltage Phase AB Cprsr2 AAI 5330055 XMotor Voltage Phase BC Cprsr2 AAI 5430056 XMotor Voltage Phase CA Cprsr2 AAI 5530057 XMotor Current A Cprsr2 AAI 5630058 XMotor Current B Cprsr2 AAI 5730059 XMotor Current C Cprsr2 AAI 5830060 XMotor % RLA A Cprsr2 AAI 5930061 XMotor % RLA B Cprsr2 AAI 6030062 XMotor % RLA C Cprsr2 AAI 6130063 XAverage Motor Current % RLA AFD 2 AAI 6230064 XRun EnableBI 130094 XXLocal Setpoint ControlBI 230095 XXLimit Mode Relay StatusBI 330096 XXChiller Running StateBI 430097 XXMaximum Capacity RelayBI 530098 XXAlarm PresentBI 1030099 XXChiller Running StatusMI 130100 XXOperating ModeMI 230101 XXFront Panel Chiller ModeMI 330102 XXFront Panel Auto/StopMI 830103 XXActive Chilled Water Setpoint SourceMI 530104 XXSetpoint SourceMI

10 430105 XXActive Current Limit Setpoint SourceMI 630106 XXManual Override ExistsBI 830107 XXRunning Status Cprsr1 ABI 1130108 XXRunning Status Cprsr2 ABI 1230109 XExternal Auto StopMI 730110 XXEmergency StopBI 930111 XXEvaporator Water Pump CommandBI 630112 XXEvaporator Water Flow StatusBI 730113 XXBAS Chiller Auto Stop CommandMV 140001 XXBAS Chiller Mode CommandMV 240002 XXChilled Water SetpointAV 140003 XXCurrent Limit SetpointAV 340004 XXBAS Noise Reduction CommandBV 340005 XLast Diagnostic CodeNot Available30114 XXReset DiagnosticBV 240008 XXEquivalent Data Points Reference List for RTHD Evo and RTAF Chillers: BACnet , Modbus RTUBAS-SVP022A-GB9 Data Point Objet NameBACnet ObjetModbus RTU RegisterRTHDRTAFAFD Fault 1 ABI 500 XXAFD Fault 2 ABI 501 XAt Speed Input OpenedBI 502 XXAt Speed Input OpenedBI 503 XXAt Speed Input ShortedBI 504 XXAt Speed Input ShortedBI 505 XXBAS Communication LostBI 506 XXBAS Failed to Establish CommunicationBI 507 XXChiller Service RecommendedBI 508 XXComm Loss: AFD Fault Input 1 ABI 509 XXComm Loss: AFD Fault Input 2 ABI 510 XComm Loss: AFD Run CommandBI 511 XXComm Loss: AFD Run CommandBI 512 XXComm Loss: Auxiliary Setpoint CommandBI 513 XXComm Loss: Oil TemperatureBI 514 XXComm Loss: Oil TemperatureBI 515 XComm Loss: Energy Meter Pulse InputBI 516 XComm Loss: Evap Iso Valve Close SwitchBI 517 XComm Loss: Evap Iso Valve Close SwitchBI 518 XComm Loss: Evap Iso Valve Open SwitchBI 519 XComm Loss: Evap Iso Valve Open SwitchBI 520 XComm Loss: Evap Isolation Valve RelayBI 521 XComm Loss: Evap Isolation Valve RelayBI 522 XComm Loss.