System
Chapter:
Connectors
Beckhoff New Automation Technology
CB3055
page 19
3.4 System
A number of signals for system control and for SMBus communication are provided through a 2x12 pin
connector (FCI 98424-G52-24LF, mating connector FCI 90311-024LF). This connector combines signals
for power button, reset, keyboard, speaker, and several LEDs such as harddisk LED, and suspend LED,
and three additional LEDs which are driven by GPIOs. Of these three GPIO-LEDs, LED1 and LED2 are
already provided with a series resistor. SMBus capable devices can also be connected.
Pinout 2x12pin connector:
Description
Name
Pin
Name
Description
ground
GND
1
13
3.3V
3.3V supply
reset to ground
RSTBTN#
2
14
PWRBTN#
on/suspend button
LED suspend / ACPI
S-LED
3
15
S3.3V
standby supply 3.3V
LED harddisk
SATALED
4
16
GPIOLED3
LED GPIO device 3
LED GPIO device 1
GPIOLED1
5
17
BATT
battery
LED GPIO device 2
GPIOLED2
6
18
SMBALERT# SMB alert
SMB Clock
SMBCLKEX 7
19
SMBDATEX SMB data
speaker to 5V
SPEAKER
8
20
SVCC
standby supply 5V
keyboard clock
KCLK
9
21
KDAT
keyboard data
ground
GND
10
22
VCC
5V supply
ground
GND
11
23
VCC
5V supply
ground
GND
12
24
VCC
5V supply
