The test method of two-dimensional code reader

The test method of 2D code reader: connect it in the right way, after connecting, press the key to boot, boot, the light is on, a clear beep sound, indicating that the scanner is connected successfully, if the connection is problematic, go to find out the reason for the specific approximate reasons: 1, the scanner's data line is connected to the normal; 2, the data line is connected to the receiving end; 3, the power supply of the receiving end whether the power supply is Insufficient to cause the scanner can not work; 4, the receiving end of the data interface is loose. WeChat platform, unlimited communication

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