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SolutionUSB Type A and USB Type B plugs have the same number of pins and are electrically identical. They are only different mechanically. This was an intentional feature designed by the USB Implementers Forum to prevent connecting a host to another host, which could cause a short circuit. In the following figure, the type A plug is on the left and the type B plug is shown on the right.

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Notice the pin numbering as well. Each plug type has the same number of pins, they are only different in mechanical design. Additional InformationThe USB receptacle on your PC is a type A connector and can be recognized by its rectangular shape.Type A receptacles can be found on upstream devices such as a USB host, or a hub. Type A plugs can be found on cables, and smaller peripherals such as a mouse and a flash drive. However, many larger USB peripherals such as printers and scanners use a detachable cable, and use the Type B receptacle, which has a square shape.

Instruments are another type of downstream device. To connect an instrument to your PC, you will need to use a USB Type A to Type B cable.