7. Data access using the Modbus RTU protocol ............................ 20
7.1 Reading out the Modbus register from the ISOMETER®. . . . . . . . . . . . . . 20
7.1.1 Command of the master to the ISOMETER® . . . . . . . . . . . . . . . . . . . . . 20
7.1.2 Answer of the ISOMETER® to the master . . . . . . . . . . . . . . . . . . . . . . . . 20
7.2 Write Modbus register (parameter setting) . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.2.1 Command of the master to the ISOMETER® . . . . . . . . . . . . . . . . . . . . . 20
7.2.2 ISOMETER® answer to the master . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.3 Exception code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.3.1 Structure of the exception code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8. Modbus register assignment of the ISOMETER® ...................... 22
8.1 Device-specific data type of the ISOMETER® . . . . . . . . . . . . . . . . . . . . . . . . 24
8.1.1 Device name . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8.1.2 Measuring values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8.1.2.1 Float = Floating point value of the channels . . . . . . . . . . . . . . 24
8.1.2.2 AT&T = Alarm type and test type (internal/external) . . . . . . . 24
8.1.2.3 R&U = Range and unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8.1.3 Alarm assignment of the relays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
8.2 Channel descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
9. IsoData data string ......................................................................... 27
10. Technical data ............................................................................... 28
10.1 Tabular presentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
10.2 Standards, approvals and certifications . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.3 Ordering information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
INDEX .................................................................................................... 30
4
isoCHA425_D00352_01_M_XXEN/10.2019
Need help?
Do you have a question about the ISOMETER isoCHA425 and is the answer not in the manual?
Questions and answers