How does (in usb in the pins) "Data -" and "Data +" work?

Question

In Usb you have a 5 volt a "Data -" a "Data +" and a "ground" pin

http://pinouts.ru/Slots/USB_pinout.shtml

now i get ground and 5 volt but what does "Data -" and "Data +"
and i get that it transfers data with it but how does it work.

Answer 1

The data is the difference between the 'Data +' pin and the 'Data -' pin. So, for a 1, the Data + pin is brought high and the Data - pin is brought low. For a 0, the Data + pin is brought low and the Data - pin in brought high. The advantage of using two pins and moving them in opposite directions is that any noise or interference is likely to affect the two wires equally, and the receiver cancels that out because it only looks at whether the Data + pin has a higher voltage than the Data - pin.



With USB, the master (typically the computer) always controls when the device communicates. So data only moves in one direction at a time. This will change with USB 3.0, which will have separate lines for each direction.

Answer 2

Read the page properly rather study it .... here is the cut out.......



USB is a serial bus. It uses 4 shielded wires: two for power (+5v & GND) and two for differential data signals (labelled as D+ and D- in pinout). NRZI (Non Return to Zero Invert) encoding scheme used to send data with a sync field to synchronise the host and receiver clocks. In USB data cable Data+ and Data- signals are transmitted on a twisted pair. No termination needed. Half-duplex differential signaling helps to combat the effects of electromagnetic noise on longer lines. Contrary to popular belief, D+ and D- operate together; they are not separate simplex connections.

Answer 3

I am no engineer but heres my thoughts. All computer language is just 0s and 1s, when you do anything data wise, you have to increase these constantly. So my guess is these cables sends volts across the wire to increase and decrease these bits.