Hitachi L2002 Instruction Manual page 247

• 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 Command
2
Coil Number
Trip factor Over-voltage (E07)
Query:
No. Field Name
1 Slave address *1
2 Function code
3 Register start number
(high order)
4 Register start number
(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.
D081 (N) D082 (N-1)
0019h
Under-voltage (E09)
.Response:
Example
No.
(Hex)
05 1
03 2
00 3
4
19
5
00
6
03
7
D5
88 8
9
10
11
Note 2:
L200 Inverter
2
D083 (N-2)
001Ah 0018h
No trip
Field Name
Slave address
Function code
Data size (in bytes) *2
Register start number
(high order)
Register start number
(low order)
Register start number + 1
(high order)
Register start number +1
(low order)
Register start number + 2
(high order)
Register start number +2
(low order)
CRC-16 (high order)
CRC-16 (low order)
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.
B–11
Example
(Hex)
05
03
06
00
07
00
09
00
FF
36
37