Spec065.pdfHART(Highway Addressable Remote Transdu

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详细说明：HART(Highway Addressable Remote Transducer)，可寻址远程传感器高速通道的开放通信协议，是美国ROSEMOUNT公司于1985年推出的一种用于现场智能仪表和控制室设备之间的通信协议IIART Communication Foundation document Number: IICF SPEC-065 Document Title: 2.4GHz DSSS O-QPSK Physical Layer Specification Table of contents P ntroduction 7 1. Scope 9 2. References… 2.1 The hart Protocol documents 2.2 Related hart documents 2.3 Related Communication documents 10 2. 4 Regulatory Documents …10 3. Definitions 4. Symbols/Abbreviations 5. Physical layer requirements 13 5.1 Requirements adopted from IEEE Std 802.15.4-2006 音D 13 5.2 Frequency allocations 14 5.3 Channel Numbers and Frequency Assignments 15 5. 4 Radio transceivers 15 5.5 Transmit Power 15 5.6 Output Power Control 16 5.7 Device Sensitivity 16 6. Physical Layer Services 16 6. 1 Message SPs ·垂 6.2 Management SPs .18 Annex A Expected Communication Distances................... 19 Annex B Revision history …20 A1.ReⅤ ISion1.0 20 Revision 1.0,, Release Date: I September, 2007 Page 3 of 20 IIART Communication foundation document number: IICF SPlc-065 Document Title: 2.4GHz DSSS O-QPSK Physical Layer Specification Table of Figures Figure 1. OSI 7-Layer Model Figure 2. Physical Layer Message SP's 17 List of tables Table 1. 802. 15. 4 Physical Layer Requirements adopted by wirelesshart 13 Table 2. Transceiver Spccifications .14 Table3.上 requency Assignments………… 15 Table 4. Local device Management Commands 18 Revision 1.0,, Release Date: I September, 2007 Page 4 of 20 IIART Communication Foundation document Number: IICF SPEC-065 Document Title: 2.4GHZ DSSS O-QPSK Physical Layer Specification Preface Revision 1.0 of the WirelessharTTM Physical Layer Specification(HCF SPEC-065) has been created to facilitate the need for wireless devices in the industrial instrumentation industry he hart Communication Foundation expresses its appreciation to the following individuals/com- panies for their contributions to the development of this specification NAME COMPANY Doug Arntson(editor) Emerson Process(Rosemount) Ken burns MACTek Toshi hasegawa Yokogawa Electric Corporation Kelly orth Emerson Proccss(Rosemount) Steve Seberger Emerson Process(Fisher Controls Kevin Towers Omnex controls Revision 1.0,, Release date: 1 September, 2007 Page 5 of 20 IIART Communication foundation document number: IICF SPlc-065 Document Title: 2.4GHz DSSS O-QPSK Physical Layer Specification Revision 1.0,, Release Date: I September, 2007 Page 6 of 20 IIART Communication Foundation document Number: IICF SPEC-065 Document Title: 2.4GHZ DSSS O-QPSK Physical Layer Specification Introduction The HART Protocol is a transaction-oriented communication service for process control devices Designed to augment traditional 4-20 mA analog signaling, HART communicating devices provide relatively low-bandwidth, moderate response-time communication in industrial environments. appli cations include remote process variable interrogation, parameter setting, and diagnostics Wired hart digital signaling is an extension of conventional analog signaling Using modulated FSK or PSK signals, an audio frequency current is superimposed on a low-frequency (typically 4-20 mA)analog current. The two signals share much of the same hardware but differ in frequency HART communicating devices signal with either current or voltage, and all signaling appears as voltage when sensed across a low impedance Wirelesshart is an extension of wired hart. The conventional wired hart physical layer digital and analog communication to distances of at least 5000 feet(1500 meters). WirelesSHAR commonly uses twisted-pair copper cable as its medium and provides solely digital or simultaneo uses Radio Frequencies(rf) to communicate between devices up to 100 meters line of sight when transmitting with 0 dB Wirelesshart devices may be powered either by wire, battery, solar, or a combination there of For purposes of convenience, communicating devices are described in terms according to the osi 7 Layer Communication Model. The Physical Layer specifies the signaling method, Signal strength, device sensitivity, and environment. However, as regards hardware or software, no clear boundary exists between layers. Effectively the division into lavers should be viewed as a division into functions. The Physical Layer requirements for HART communication are the focus of this document. A representation of the relationship between the haRT protocol communications layers (including firmware and hardware) is given in Figure OSI Layer Function HART Provides the User with Network Capable Application Command Oriented. Predefined Data Types and Applications Application Procedures Presentation Converts Application Data Between Network and local machine formats Session Connection Management Services for Applications Transport Provides Network Independent Auto-Segmented transfer of large data sets, reliable Transparent Message Transfe stream transport, Negotiated Segment sizes Network End to End Routing of Packets. Resolving Power-Optimized, Redundant Path, Self- Network Addresses Healing Wireless Mesh Network, Data link Establishes Data Packet structure A Binary, Byte Oriented, Token Passing, Secure Reliable, Tme synched Framing Error Detection, Bus Arbitration Master/ Slave Protocol TDMA/CSMA, Frequency Agile with ARQ Physical Mechanical /Electrical Connection Simultaneous Analog Digital Signaling 2. 4GHz Wireless, 802.15.4 based radios Transmits Raw bit stream Normal 4-20mA Copper Wiring 10dBm Tx Power Wired fskpsk rs485 WIreless 2.4GHz Figure 1. OSI 7-Layer Model Revision 1.0,, Release date: 1 September, 2007 Page 7 of 20 IIART Communication foundation document number: IICF SPlc-065 Document Title: 2.4GHz DSSS O-QPSK Physical Layer Specification The Physical laver The lowest layer on the osi model and probably the easiest to understand is the physical layer With wired HART, this layer deals with the physical, electrical, and cable issues involved with making a network connection. Similarly with WirelesshaRt, this layer deals with radi characteristics making a network connection. It associates with any part of the network structure that doesn't process information in any way The physical layer is responsible for sending the bits across the network media. It does not define what a bit is or how it is used merely how it's sent. The physical layer is responsible for transmitting and receiving the data Items defined by the physical layer include rF transmitters, receivers, and transceivers. Any item that does not process information but is required for the sending and receiving of data is defined by this layer Revision 1.0,, Release Date: I September, 2007 Page 8 of 20 IIART Communication Foundation document Number: IICF SPEC-065 Document Title: 2.4GHZ DSSS O-QPSK Physical Layer Specification 1。 SCOPE This specification defines the WirelessHART Physical Layer. This specification is used for devices implementing wireless mesh network communication as defined by the hart specifications. The Physical Layer is responsible for the signaling method, signal strength, device sensitivity, and environment for sending bits across the network media. This Wireless Physical Layer Specification is based on the IEEE STD 802. 15.4-2006 2 4GHz DSSs Physical Layer employing o-QpsK modulation This document includes Specific Physical layer requirements many of which are adopted directly from IEEE STD 802.15 4-2006. It also provides specific requirements on channels, transmit power, and receive sensitivitv Service definitions the Physical Layer provides to higher layers to send and receive data on the media. It also defines the local management parameters used to control the operation of the physical layer Specifies Physical Layer requirements to ensure interoperability among hart devices REFERENCES 2.1 The hart protocol documents These documents published by the hart Communication Foundation are referenced throughout this specitication HART Field Communications Protocol Specification. HCF SPEC-12 Token-Passing Data-Link layer specification. HCF SPEC-81 Network Management Specification. HCF SPEC-85 2.2 Related hart documents References to other standards, clarifying documents and applicable patents are listed in this subsection Wirelesshart User Guide. HCF LIT-84 Coexistence Test Plan. HCF LIT-85 Approved ieee 802.15.4TM Transceivers. HCF LIT-088 Note: 802.15.4 is a trademark of the Institute of electrical and Electronic engineer Revision 1.0,, Release date: 1 September, 2007 Page g of 20 IIART Communication foundation document number: IICF SPlc-065 Document Title: 2.4GHz DSSS O-QPSK Physical Layer Specification 2.3 Related Communication documents The following are applicable ieee documents IEEE 802.15.4-2006 Wireless medium Access Control and Physical Layer Specifications for Low-Rate Wireless area networks The following provides gencral guidelines for the spccification of communication protocols ISO 7498-1 Information Processing Systems OSI Reference Model- The Basic model 2.4 Regulatory Documents Devices should be designed to meet the requirements for their installation locale. The following is a partial list regulatory documents that a compliant product may be expected to meet IEC 61000-6-2. Electromagnetic compatibility (EMc)-Part 6-2: Generic standards Immunity for industrial environments. International Electrotechnical Commission en 300 328. Radio Equipment and Systems (RES, wideband transmission systems, Technical characteristics and test conditions for data transmission equipment operating in the 2, 4 Ghz Im band and using spread spectrum modulation techniques. European Telecommunications standards institute Federal Communication Commission cFr 47 Part 15. Telecommunications. radio Frequency Devices. U.S. Government Printing Office ARIB STD-T66. Second Generation low Power Data Communication System/Wireless LAN System. Association of Radio Industries and Businesses (Japan) Revision 1.0,, Release Date: I September, 2007 Page 10 of 20

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