Data access using the Modbus RTU protocol
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isoPV425_D00028_09_M_XXEN/05.2018
7.1.2 ISOMETER® answers the master
7.2 Writing to Modbus registers (parameter setting)
Registers in the device can be modified with the Modbus command 0x10 (set
multiple registers). Parameter registers are available from address 3000. The
content of the register is listed in the table on Page 45.
7.2.1 Master sends a command to the ISOMETER®
In this example, the master addresses the ISOMETER® with address 3 and re-
quests that the content of the register with address 3003 is set to 2.
Byte Name Example
Byte 0 ISOMETER® Modbus address 0x03
Byte 1 Function code 0x03
Byte 2 Number of data bytes 0x02
Byte 3, 4 Data 0x0047
Byte 7, 8 CRC16 Checksum 0x81B6
Byte Name Example
Byte 0 ISOMETER® Modbus address 0x03
Byte 1 Function code 0x10
Byte 2, 3 Start register 0x0BBB
Byte 4, 5 Number of registers 0x0001
Byte 6 Number of data bytes 0x02
Byte 7, 8 Data 0x0002
Byte 9, 10 CRC16 Checksum 0x9F7A
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