vb 與plc 使用usb連結的語法問題－stacey33的部落格

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OPEN & LOCK造型鬆餅機

訂購網址：http://www.7net.com.tw/7net/rui005.faces?ID=110700147396&catid=13587&visit_chn=02&vid=ivip&mid=ivip_01&user=af000017132

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1. first of all, You must understand to be different betwwen RS232 and USB .
2. USB needs software protocol to handshake with device.
3. USB has 3 type transfer protocol ( ISO transfer, Bulk transfer, Interrupt transfer) and Setup transfer for every device.
4. if your device (PLC) adopts Interrupt Transfer, You must code program
like hidUsb.sys in kernel of window and create device name UDBPDO device you open and ioctl in use mode

本文出自: http://tw.knowledge.yahoo.com/question/question?qid=1512022305953
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