7-11
Chapter 7
About the Modbus TCP
7.2.9
Diagnostics [08h]
Function code 08 provides a test (only 00: Retrun
Query Data) for checking the communication
system between the server and the client.
The normal response to the Return Query Data
request is to loopback the same data. The function
code and sub-function codes are also echoed.
[Requenst]
[Response]
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, 6 byte lengths
(address 6 through 11).
5
Data size (Lo)
06h
6
Unit ID
FFh
7
Modbus
data part
Function code
08h
8
Sub-function (Hi)
00h
9
Sub-function (Lo)
00h
10
Data (Hi)
XXh
←
freely-selected
11
Data (Lo)
XXh
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, 6 byte lengths
(address 6 through 11).
5
Data size (Lo)
06h
6
Unit ID
FFh
7
Modbus
data part
Function code
08h
8
Sub-function (Hi)
00h
9
Sub-function (Lo)
00h
10
Data (Hi)
XXh
←
freely-selected
11
Data (Lo)
XXh
Summary of Contents for SJ-P1 Series
Page 9: ...C 3 Table of Contents Memo ...
Page 17: ...1 8 Chapter 1 Safety Precautions Memo ...
Page 21: ...2 4 Chapter 2 Overview Memo ...
Page 25: ...3 4 Chapter 3 About the P1 EN Memo ...
Page 29: ...4 4 Chapter 4 Enclosed Items Memo ...
Page 45: ...6 8 Chapter 6 Inverter Settings Memo ...