Echoback Test - Omron KM50 Communications Manual

■ Echoback Test

• Command Frame
Slave
Function
address code
08 hex
1 1
• Response Frame
Slave Function
address
code
08 hex
1 1
• If the command is executed normally, the response returns the data that was sent in the
command.
(1) Test Data
Enter any 2-byte hexadecimal data.
(2) Response Codes
Function code
88 hex
08 hex
● Example Command and Response
The following example is for Echoback Test.
(In this case, the test data is 1234 hex and the slave address is 01 hex.)
Command：
Response：
Write start
address
Test data
00 hex 00 hex
2
Write start
Test data
address
00 hex 00 hex
2
Error code Name
03 hex Variable data error
−
Normal completion
01 08 00 00
01 08 00 00
4. 4 Detailed Descriptions of Services
CRC-16
2 bytes
2
CRC-16
2 bytes
2
Description
The data following the function code
was not the fixed data (00 hex, 00 hex).
No errors were detected.
12 34 ED 7C (CRC-16)
12 34 ED 7C (CRC-16)
4-13