Read Holding Register [03H] - Hitachi X200 Series Instruction Manual

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 D081
Command (factor)
Register 0012h
Number
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
(frequency)
0014h
9.9Hz
Response:
Example
No.
(Hex)
01 1 Slave address
03 2 Function code
00 3 Data size (in bytes) *2
11 4 Register data 1 (high order)
00 5 Register data 1 (high order)
06 6 Register data 2 (high order)
95 7 Register data 2 (low order)
CD 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)
D081
(output current) (DC-bus Voltage)
0016h 0017h
3.0A 284V
Field Name
B 11
B 11
D081
Exampl
e
(Hex)
01
03
0C
00
03
00
00
00
63
00
00
00
1E
01
1C
AF
6D