Hitachi WJ200-001S Instruction Manual page 562

(4) Reading out Holding Register[03h],Target register: External register (First pair)
Query:
No
1 Slave address
2 Function code
3 Register start address (high order)
4 Register start address (low order)
5 Number of holding registers (high order)
6 Number of holding registers (low order)
7 CRC-16 (high order)
8 CRC-16 (low order)
Response:
No Field Name
1 Slave address
2 Function code
3 Data size (in bytes)
4 Register data 1 (high order)
5 Register data 1 (low order)
6 CRC-16 (high order)
7 CRC-16 (low order)
Field Name
Example
(Hex)
01
03
02
00
01
79
84
Example
(Hex)
01
03
Register address value
50
= Register
00
Number - 1
00
One register
01
95
0A
0001h → 1 d → 1
Ver.3− − − − 53