USB is a common PC interface with only 4 wires, two power and two signals.
1. The function of the red wire is the positive pole of the power supply (the marking on the wiring is: +5V or VCC). The role of the black line is the negative working voltage data line (identified as: Data- or USBPort-). The function of the blue line is the positive working voltage data line (identified as: Data+ or USBPort+). The role of the black bar is the grounding device (marked as: GND).
2. USB devices are very convenient for users to carry a lot of information with them. Naturally USB hard drives are the main choice. The common ones are the hard disk with IDE interface, the mouse and keyboard with serial communication, and the printer and scanner with parallel port, but after having USB, this kind of external device can be connected to personal computer with the same specification, then we have USB hard disk. , USB computer mouse, USB copier.
3. The 4 wires of the USB cannot be connected randomly. The order of the 4 lines is determined, but there are two orientations. If the two data lines are not connected correctly, the USB device will not be recognized in the end. However, the two data lines must not be inserted wrongly. Each USB interface can be supplied. The amount of current is +5V500MA. If the connection is wrong, the USB device will be burned in light, and the main board of the computer will be damaged in heavy.
