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樓主  發(fā)表于: 2014-08-06 16:07
這幾天在用MODBUS RTU調試軟件(主站)調試一個(gè)MODBUS RTU從站設備,兩者通過(guò)一根USB轉串口線(xiàn)連接,現在的問(wèn)題是:
1,在我的本本上,只是把USB轉串口線(xiàn)插在電腦上,不接設備,也會(huì )有數據返回,
2,我換臺電腦,無(wú)數據返回,從機也沒(méi)有接收到數據。COM口是對的。
3,如果是線(xiàn)的問(wèn)題,我試過(guò)把從機端的RS232接收發(fā)送端的短接,接收到的數據和發(fā)送的數據是一樣的。
4,如果是電腦的問(wèn)題,我用這根線(xiàn)下載程序又是可以的。
被這個(gè)問(wèn)題困擾了好幾天,還請高手指點(diǎn)指點(diǎn)。

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