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樓主  發(fā)表于: 2009-04-09 10:44
FX2N系列PLC，FX2N-232BD通信擴展模塊�，F計算機與PLC可以通過(guò)232BD正常通信，讀寫(xiě)程序都沒(méi)有問(wèn)題。但用VB對PLC進(jìn)行讀寫(xiě)操作時(shí)，顯示硬件連接或報文設置有錯誤。VB中MSComm控件的屬性設置里面和計算機串口當前的設置時(shí)一致的，為什么顯示的是報文錯誤呢。補充：D8120=HEB81,專(zhuān)用協(xié)議，9600,有起始符停止符，1停止位，數據位8，無(wú)奇偶校驗，自動(dòng)加校驗和。

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