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5 Pin PC Keyboard

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Reference and Sources:

(At the computer)

5 PIN DIN 180° (DIN41524) FEMALE at the computer.

Pin	Name	Description	Technical
1	CLOCK	Clock	CLK/CTS, Open-collector
2	DATA	Data	RxD/TxD/RTS, Open-collector
3	n/c	Not connected	Reset on some very old keyboards.
4	GND	Ground
5	VCC	+5 VDC

Clock

This signal is sent from the keyboard to synchronise the data signal.

Data

Keyboard scan codes are sent from the keyboard to the computer on this single wire serially.

Reset

This signal is rarely used and many keyboards don't even connect it. It was used to let the computer reset the keyboard. The PS/2 design from IBM even abandonned it from it's new connector.

+5 Vdc

This is a simple 5 volts signal for giving power to the keyboard.

Ground

This is a common ground signal used as a return path for data and is a reference to logical 0.