The USB port lines are reported in the following table:
|
Name |
Description |
|---|---|
|
D+ |
Data positive |
|
D- |
Data negative |
|
VCC |
Power line at 5 V |
|
GND |
Common ground |
Tip
Note that the preceding table refers to USB 1.1 and USB 2.0 standards only, since USB 3.x, more signals have been added.
As a special feature, the USB bus includes the VCC signal too; this is because it can power the devices directly from the bus.