Hitachi SJ2002 Series, Instruction Manual

Page: 249 / 306

SJ200
2
Inverter
Appendix B
B–11
• 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:
SJ200
2
Command D081 (N) D082 (N-1) D083 (N-2)
Coil Number 0019h 001Ah 0018h
Trip factor Over-voltage (E07) Under-voltage (E09) No trip
Query:
Note 1: Broadcasting is disabled.
Response:
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.
No. Field Name
Example
(Hex)
1 Slave address *1 05
2 Function code 03
3 Register start number
(high order) 00
4 Register start number
(low order) 19
5 Number of holding
registers (high order) 00
6 Number of holding
registers (low order) 03
7 CRC-16 (high order) D5
8 CRC-16 (low order) 88
No. Field Name
Example
(Hex)
1 Slave address 05
2 Function code 03
3 Data size (in bytes) *2 06
4 Register start number
(high order) 00
5 Register start number
(low order) 07
6 Register start 1
(high order) 00
7 Register start 1
(low order) 09
8 Register start 2
(high order) 00
9 Register start 2
(low order) FF
10 CRC-16 (high order) 36
11 CRC-16 (low order) 37