Hitachi CP-X200 instruction manual X200 D081 Command

B－11

B11

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.

ξReading Trip monitor 1 factor and trip frequency, current, and voltage from an inverter having a slave address “1”

ξThis example assumes the previous three trip factors are as follows:

X200	D081	D081	D081	D081
Command	(factor)	(frequency)	(output current)	(DC-bus Voltage)
Register	0012h	0014h	0016h	0017h
Number
Trip factor	Over-Current	9.9Hz	3.0A	284V
	(E03)

Appendix BAppendix

Query:

No.	Field Name	Example
		(Hex)
1	Slave address *1	01
2	Function code	03
3	Register start address	00
	*3
	(high order)
4	Register start address	11
	*3
	(low order)
5	Number of holding	00
	registers (high order)
6	Number of holding	06
	registers(low order)
7	CRC-16 (high order)	95
8	CRC-16 (low order)	CD

Response:

		Exampl
No.	Field Name	e
		(Hex)
1	Slave address	01
2	Function code	03
3	Data size (in bytes) *2	0C
4	Register data 1 (high order)	00
5	Register data 1 (high order)	03
6	Register data 2 (high order)	00
7	Register data 2 (low order)	00
8	Register data 3 (high order)	00
9	Register data 3 (low order)	63
10	Register data 4 (high order)	00
11	Register data 4 (low order)	00
12	Register data 5 (high order)	00
13	Register data 5 (low order)	1E
14	Register data 6 (high order)	01
15	Register data 6 (low order)	1C
16	CRC-16 (high order)	AF
17	CRC-16 (low order)	6D

B

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.