Hitachi L2002 Note 1:, Note 2:, Read Holding Register [03h]:

B–11

L2002 Inverter

•When a read coil is outside the defined coils, the final coil data to be transmitted contains “0“as the status of the coil outside the range.

•When the Read Coil Status command cannot be executed normally, see the exception response.

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 previous three trip factors from an inverter having a slave address “5”

•This example assumes the previous three trip factors are as follows:

L2002 Command	D081 (N)	D082 (N-1)	D083 (N-2)	BAppendix
Coil Number	0019h	001Ah	0018h
Trip factor	Over-voltage (E07)	Under-voltage (E09)	No trip
Query:		.Response:

No.	Field Name	Example
		(Hex)
1	Slave address *1	05
2	Function code	03
3	Register start number	00
	(high order)
4	Register start number	19
	(low order)
5	Number of holding	00
	registers (high order)
6	Number of holding	03
	registers (low order)
7	CRC-16 (high order)	D5
8	CRC-16 (low order)	88

Note 1: Broadcasting is disabled.

No.	Field Name	Example
		(Hex)
1	Slave address	05
2	Function code	03
3	Data size (in bytes) *2	06
4	Register start number	00
	(high order)
5	Register start number	07
	(low order)
6	Register start number + 1	00
	(high order)
7	Register start number +1	09
	(low order)
8	Register start number + 2	00
	(high order)
9	Register start number +2	FF
	(low order)
10	CRC-16 (high order)	36
11	CRC-16 (low order)	37

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.