SST Automation GS11-EI, Руководство пользователя

Страница: 14 / 51

User Manual
Embedded EtherNet/IP Module
GS11-EI
13
1. Request message (user board -> module)
Byte Description
0
message length includes all following bytes except the check sum byte , high-byte first
1
2
Input data, high-byte first
…
n
n+1 Check sum, byte 0+byte 1+…+byte n
2. Response message of user-defind protocol (module -> user board)
Byte Correct response Byte Incorrect response
0 message length includes all following bytes except the
check sum byte , high-byte first
0 0x80
1 1 Data length is2
2
Output data, high-byte first
2 Error code
…
3 Extra error code
n 4
Check sum, byte 0+byte 1+byte
2+byte3
n+1 Check sum, byte 0+byte 1+…+byte n
3. Error code
Index Error code Description
0 1
和校验错误
1 2
数据长度错误
4. Extra error code is always 0xFF.