JUMO 701061, Описание интерфейса

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Contents
1 Introduction 5
1.1 Preface .......................................................................................................... 5
1.2 Typographical conventions ......................................................................... 6
1.2.1 Warning signs ................................................................................................. 6
1.2.2 Note signs ...................................................................................................... 6
1.2.3 Representation modes ................................................................................... 6
1.3 Identifying the instrument version .............................................................. 7
1.4 Interface connection .................................................................................... 7
1.5 Configuration ................................................................................................ 8
2 Protocol description 9
2.1 Master-slave principle ................................................................................. 9
2.2 Transmission mode (RTU) ........................................................................... 9
2.3 Device address ........................................................................................... 10
2.4 Timing of the communication ................................................................... 10
2.4.1 Timing of a data request .............................................................................. 12
2.4.2 Communication during the internal processing time of the slave ................ 12
2.4.3 Communication during the response time of the slave ............................... 12
2.5 Structure of the data blocks ...................................................................... 13
2.6 Error handling ............................................................................................. 14
2.7 Checksum (CRC16) .................................................................................... 15
3 Functions 17
3.1 Read n words .............................................................................................. 17
3.2 Write one word ........................................................................................... 18
3.3 Write n words .............................................................................................. 19
3.4 Data acceptance after writing .................................................................. 20
4 Data flow 21
4.1 Parameter addresses and formats ........................................................... 21
4.2 Transmission formats ................................................................................ 21