Table of Contents
5
isoPV425_D00028_09_M_XXEN/05.2018
7. Data access using the Modbus RTU protocol ........................................... 41
7.1 Reading out the Modbus register from the ISOMETER® ................. 41
7.1.1 Master sends a command to the ISOMETER® ...................................... 41
7.1.2 ISOMETER® answers the master ............................................................... 42
7.2 Writing to Modbus registers (parameter setting) .............................. 42
7.2.1 Master sends a command to the ISOMETER® ...................................... 42
7.2.2 ISOMETER® answer to the master ............................................................ 43
7.3 Exception code ............................................................................................... 43
7.3.1 Structure of the exception code .............................................................. 43
8. Modbus register assignment of the ISOMETER® ...................................... 44
8.1 ISOMETER® device-specific data type .................................................... 49
8.1.1 Device name ................................................................................................... 49
8.1.2 Measuring values .......................................................................................... 50
8.1.2.1 Float = Floating point value of the channels .............................. 50
8.1.2.2 AT&T = Alarm type and test type (internal/external) .............. 51
8.1.2.3 R&U = Range and unit ......................................................................... 52
8.1.3 Alarm assignment of the relays ................................................................ 53
8.2 Channel descriptions ................................................................................... 54
9. IsoData data string ........................................................................................ 56
10. Technical data .............................................................................................. 58
10.1 Tabular presentation .................................................................................... 58
10.2 Standards, approvals and certifications ................................................ 64
10.3 Ordering data ................................................................................................. 65
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