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Data communication failures can be checked as follows:
The first step: to plug USB port, to allow the computer to search equipment.
The second step: restart the power supply, to automatically find.
Step third: check the USB interface wiring is correct.
The fourth step: substitution, to another computer can be normal use.

Missing or wrong data:
Q: USB, RS232 product identification port is what type, support LPT port?
Answer: USB converter identification port for the COM port, LPT port does not support.

Q: what are the operating system USB to RS232 product support, with the CD?
Answer: USB RS232 products with product CD-ROM drive, support operating system: Win98/Win2000/WinXP/Vista/Win7/Linux

Q: USB RS232 is the product of length, is what color?
Answer: USB, RS232 serial line of 1.5 meters

Q: USB, RS232 drives after installation, equipment or not?
Answer: in the device manager will be the emergence of Windows USB-RS232 corresponds to the COM port, just select the COM port can be in the programming software or other applications, then use the RS232 interface with the same.