B–11, Appendix b – Hitachi L2002 User Manual
Page 247
L200
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:
L200
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 number + 1
(high order)
00
7
Register start number +1
(low order)
09
8
Register start number + 2
(high order)
00
9
Register start number +2
(low order)
FF
10
CRC-16 (high order)
36
11
CRC-16 (low order)
37