Hitachi WJ200-001S Instruction Manual page 555

Ver.3− − − − 46
As same as in which an external register number is overlapped with Hitachi register number (High order),
access to high order of A020 is forbidden, because only high order of 32-bit register cannot store
meaningful information. Please refer to the example below.
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
1 Slave address
2 Function code
3 Exception code
4 CRC-16 (high order)
5 CRC-16 (low order)
Access
denied
Field Name
Field Name
External register
number
1216h
(A20 （ H IGH ） )
1217h
(A20 （ L ow ） )
Example
(Hex)
01
03
12
15
00
01
90
B6
Example
(Hex)
01
83
32
C0
E5
Internal register
number
Register address value
= Register
Number - 1
One register
120Fh
(A013 ）