Hitachi SJ-P1 Series - Page 61

7-16
Chapter 7
About the Modbus TCP
[Response]
The normal response contains the data from the
group of registers that were read.
Hi: high order
Lo: low order
Address
Blocks
Items
Code
0
Modbus TCP
header part
Transaction ID (Hi)
15h
1
Transaction ID (Lo)
01h
2
Protocol ID (Hi)
00h
3
Protocol ID (Lo)
00h
4
Data size (Hi)
00h
In the case, 7 byte lengths
(address 6 through 12).
5
Data size (Lo)
07h
6
Unit ID
FFh
7
Modbus
data part
Function code
17h
8
Byte count
04h
9
Read register value 1 (Hi)
00h
0000 0BB8h
→3000d→30.00[s]
10
Read register value 1 (Lo)
00h
11
Read register value 2 (Hi)
0Bh
12
Read register value 2 (Lo)
B8h