Hitachi WJ200-001S Instruction Manual page 346

Read Holding Register [03h]:
This function reads the contents of the specified number of consecutive holding
registers (of specified register addresses). An example follows below.
 Reading Trip monitor 1 factor and trip frequency, current, and voltage from an
inverter having a slave address "1"
 This example assumes the previous three trip factors are as follows:
X200 Command
2
Register Number 0012h
Trip factor Over-Current
(E03)
Query:
No. Field Name
1 Slave address *1
2 Function code
3 Register start address *3
(high order)
4 Register start address *3
(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)
Note 1: Broadcasting is disabled.
Note 2: Data is transferred by the specified number of data bytes (data size). In this
case, 6 bytes are used to return the content of three holding registers.
Note 3: The PDU Register Number are addressed starting at zero. Therefore register
numbered "0012h" are addressed as "0011h". Register address value
(transmitted on Modbus line) is 1 less than the Register Number.
D081 D081
(factor) (frequency)
0014h
9.9Hz
Example
(Hex)
01
03
00
11
00
06
95
CD
D081
(output current)
0016h
3.0A
Response:
No. Field Name
1 Slave address
2 Function code
3 Data size (in bytes) *2
4 Register data 1 (high order)
5 Register data 1 (high order)
6 Register data 2 (high order)
7 Register data 2 (low order)
8 Register data 3 (high order)
9 Register data 3 (low order)
10 Register data 4 (high order)
11 Register data 4 (low order)
12 Register data 5 (high order)
13 Register data 5 (low order)
14 Register data 6 (high order)
15 Register data 6 (low order)
16 CRC-16 (high order)
17 CRC-16 (low order)
B11
D081
(DC-bus Voltage)
0017h
284V
Example
(Hex)
01
03
0C
00
03
00
00
00
63
00
00
00
1E
01
1C
AF
6D