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Chapter: Connectors
3.3 System
Some typical signals for system control are provided through a 2x9 pin connector (JST B18B-PHDSS,
mating connector: PHDR-18VS). This connector combines signals for power button, reset, keyboard,
speaker, and several LEDs such as harddisk LED, touch screen LED, 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. As can be seen from the pinout table below, corresponding signals are often placed vis-à-vis
or at least near to each other.
Description
ground
ground
LED touch screen
LED suspend / ACPI
LED harddisk
LED GPIO device
LED GPIO device
speaker to 5 volt
standby supply 5 volt
page 18
Name
Pin
GND
1
GND
2
TOUCHLED 3
S-LED
4
HDLED
5
LED1
6
LED2
7
SPEAKER
8
(S)VCC
9
Name
10
PWRBTN#
11
RESET#
12
3.3V
13
S3.3V
14
3.3V
15
3.3V
16
LED3
17
KDAT
18
KCLK
Beckhoff New Automation Technology CB2050
Description
on/suspend button
reset to ground
3.3 volt supply
standby supply 3.3 volt
3.3 volt supply
3.3 volt supply
LED GPIO device
keyboard data
keyboard clock
System
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