Chauvin Arnoux ULYS FLEX Modbus Notice De Fonctionnement page 38

INDEX • Modbus protocol
1. Description ....................................................................................................................39
1.1 LRC GENERATION.................................................................................................................................................................... 40
1.2 CRC GENERATION ................................................................................................................................................................... 41
2. Command structure ......................................................................................................44
2.3 FLOATING POINT AS PER IEEE STANDARD ............................................................................................................................ 46
3. Exception codes .............................................................................................................47
4. Register tables ..............................................................................................................48
4.1 READING REGISTERS (FUNCTION CODE $03 / $04) .............................................................................................................. 49
4.2 READING AND WRITING REGISTERS (FUNCTION CODE $03 / $04 / $10) ............................................................................. 55
4.3 CONSIDERATIONS ON THE FULL SCALE VALUE CALCULATION ........................................................................................... 61
5. Reading command examples ........................................................................................62
6. Writing command examples ..........................................................................................64