Xytronix Research & Design WebRelay-10 X-WR-10R12-I, Руководство пользователя

Страница: 69 / 107

WebRelay-10 Users Manual Operation
Errors
Input Read Error Function Code (1 Byte): 0x82
Exception codes (1 Byte):
0x01 – Function not supported.
0x02 – Incorrect combination of start address and input quantity.
Error Response Frame Example
Field Name Length Function Example Data
Transaction Identifier 2 bytes Synchronization between messages of
server and client. 0x0001
Protocol Identifier 2 bytes Zero for Modbus/TCP 0x0000
Message Length 2 bytes Number of bytes in frame (below) 0x0003
Unit Identifier 1 byte Slave Address (0xff if not used) 0xFF
Function Code 1 byte Error code 0x82
Data 1 byte Exception code (
0x01 - 0x02
) 0x02
Rx String: 00 01 00 00 00 03 FF 82 02
Xytronix Research & Design, Inc. page 69