nVent RAYCHEM DigiTrace TCONTROL-CONT-03 Anleitung Seite 3

CONTENTS
1 Introduction ..................................................................................4
1.1 Preface ............................................................................................................4
1.2 Typographical conventions ............................................................................4
2 Protocol description..................................................................... 5
2.1 Master-Slave principle ....................................................................................5
2.2 Transmission mode (RTU) .............................................................................5
2.3 Device address ...............................................................................................6
2.4 Timing of the communication .......................................................................6
2.5 Structure of the data blocks ..........................................................................9
2.6 Function codes .............................................................................................10
2.6.1 Read n words ......................................................................................10
2.6.2 Write one word ...................................................................................11
2.6.3 Write n words .....................................................................................12
2.7 Transmission format (integer, float and text values) .................................13
2.8 Checksum (CRC16) ......................................................................................15
2.9 Error processing ...........................................................................................16
3 nVent RAYCHEM RS485 interface .............................................. 17
3.1 Connection diagram .....................................................................................17
3.2 Configuration ................................................................................................18
4 Modbus addresses .................................................................... 19
4.1 Process data .................................................................................................19
4.2 Set point values ............................................................................................20
4.3 Controller parameters ..................................................................................21
4.4 Configuration ................................................................................................21
4.5 Commands ...................................................................................................22
4.6 RAM memory ................................................................................................23
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