(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.