Hitachi WJ200-001S Instruction Manual page 348

Write in Holding Register [06h]:
This function writes data in a specified holding register. An example follows:
 Write "50Hz" as the first Multi-speed 0 (A020) in an inverter having slave address
"5."
 This example uses change data "500(1F4h)" to set "50Hz" as the data resolution of
the register "1029h" holding the first Multi-speed 0 (A020) is 0.1Hz
Query:
No. Field Name
1 Slave address *1
2 Function code
3 Register start address
*2
(high order)
4 Register start address
*2
(low order)
5 Change data
(high order)
6 Change data
(low order)
7 CRC-16 (high order)
8 CRC-16 (low order)
Note 1: No response is made for a broadcasting query.
Note 2: The PDU Register Number are addressed starting at zero. Therefore register
numbered "1029h" are addressed as "1028h". Register address value
(transmitted on Modbus line) is 1 less than the Register Number.
When writing in a selected holding register fails, see the exception response.
Response:
Example
No.
(Hex)
08 1 Slave address
06 2 Function code
10 3 Register start address
*2
(high order)
28 4 Register start address
*2
(low order)
01 5 Change data
(high order)
F4 6 Change data
(low order)
0D 7 CRC-16 (high order)
8C 8 CRC-16 (low order)
Example
Field Name
B13
(Hex)
08
06
10
28
01
F4
0D
8C