Omron SYSDRIVE 3G3JV-A4002, User Manual

Page: 134 / 235

7-18
7-4-3 Loop-back Test (Function Code: 08 Hex)
H
Settings and Response
•
The DSR message from the Master is returned as a response. The Inverter does not retrieve or pro-
cess this data.
•
The DSR message or normal response for loop-back test use is divided into 8-byte blocks as shown
below. Any data can be set as test data 1 or 2 provided that the number of data items remains changed.
•
This command is used for checking the status of communications or for dummy communications with-
out detecting any communications time-over.
D
DSR Message
Byte No. Data
1 Slave address
2 Function code (08 Hex)
3
Test data 1
4
5 Test data 2
6
7 CRC-16 check
8
D
Response
Normal
Byte No. Data
1 Slave address
2 Function code (08 Hex)
3 Test data 1
4
5 Test data 2
6
7
CRC-16 check
8
Error
Byte No. Data
1 Slave address
2 Function code (88 Hex)
3 Error code
4 CRC-16 check
5
Note When an error occurs, the MSB of the function code will be set to 1.
Communications Chapter 7