Only one purpose, data interception of fingerprints, and then simulation of fingerprints to the machine to send data,

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http://www.cppfans.com/victorcomm/yb_comm_133.asp

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Recommended by Eltima product virtual serial port,

Google "Eltima Virtual Serial Port Driver"

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Do you want to become?

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1 VSPD

2 lines connected to a serial port 2, 3 needles, but before the machine is to send and receive,

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Virtual serial port, associated with two serial ports