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一曲飄零
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樓主  發(fā)表于: 2024-06-24 14:33
圖片：
用smart200的485口連接空調線(xiàn)控器，讀取空調內的數據。
我用調試助手驗證可以讀，用PLC就讀出來(lái)時(shí)0，也不報錯。同樣的程序我讀寫(xiě)遠程模塊就沒(méi)問(wèn)題。這啥情況��？是我程序有問(wèn)題嗎？
by海綿
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1樓  發(fā)表于: 2024-06-24 15:57
如果通過(guò)PLC可以進(jìn)行寫(xiě)操作，那證明通訊上是沒(méi)問(wèn)題的。數據為0，可以監控報文來(lái)分析。
使用USB轉485并入通訊線(xiàn)中，使用串口助手來(lái)檢測報文，觀(guān)察PLC發(fā)送是否正常，設備返回是否正常

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