Hitachi WJ200-001S Instruction Manual page 546

Query:
No
1 Slave address
2 Function code
3 Register start address (high order)
4 Register start address (low order)
5 Change data (high order)
6 Change data (low order)
7 CRC-16 (high order)
8 CRC-16 (low order)
Response:
No Field Name
1 Slave address
2 Function code
3 Register start address
(high order)
4 Register start address
(low order)
5 Change data (high order)
6 Change data (low order)
7 CRC-16 (high order)
8 CRC-16 (low order)
You can confirm P057 value as -1% by the operator.
Field Name
Example
Example
(Hex)
01
06
40
Register address value = Register
02
Number - 1
FF
FFF6h represents -1 in two's
FF
compliment in signed conversion
CC
7A
(Hex)
01
06
40
Register address value = Register
Number - 1
02
FFFFh
FF
compliment
FF
3C
7A
Ver.3− − − − 37
represents -1 in two's