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湛藍小爾
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樓主  發(fā)表于: 2018-03-05 09:24
如題所示
廠(chǎng)家提供的modbus scan是沒(méi)有多收字符的
我試其他串口助手，收到的數據，結尾多FF
了解modbus rtu通訊格式的朋友，會(huì )知道，結尾2位是CRC，在CRC后面加個(gè)字符，PLC誤判最后兩位是CRC，報錯誤，通訊不下去
有個(gè)吧友說(shuō)道，遇見(jiàn)過(guò)，忘記了
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vast_1993
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1樓  發(fā)表于: 2018-03-16 18:57
如果全是FFFFF一般是干擾導致的，如果在正常數據后面多了FF，建議調低波特率試試

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