BECKHOFF CB4051 - Manual (Page 17)

System Chapter: Connectors
Beckhoff New Automation Technology CB4051 page 17
4.3 System
The system connector, which has the main functions that are necessary to start the board, is provided via
a standard IDC socket connector with a spacing of 2.54 mm.
This connector supports the following interfaces: PS/2 keyboard, PS/2 mouse, speaker, external
RTC-battery and reset of the board.
N OTE
For "Real Time Clock" an external battery (3.3V) must be connected. Connect "+" to VBAT and "-" to
GND.
Description Name Pin Name Description
speaker to 5 volt SPEAKER 1 2 GND ground
reset to ground RESET# 3 4 KLOCK# keyboard lock
keyboard Data KDAT 5 6 KCLK keyboard clock
mouse data MDAT 7 8 MCLK mouse clock
CMOS battery ≥ 3 volt VBAT 9 10 VCC 5 volt supply