Figure 2.18Dc-Power Jack - Advantech RSB-4221 User Manual

2.2.2.18 DC-power Jack (CN21)
RSB-4221 supports a DC-Jack header that connects 12V DC external power input.
Pin
1
2
2.2.2.19 Recovery (SW2)
RSB-4221 supports a recovery function when it runs on Android OS. Under Linux OS
the recovery button (SW2) is useless.
You must press SW2 for about 5 seconds as the board powers up.
Generally speaking, you can find the following string under console when the system
enters recovery mode:
...
## input value is 0
hit recovery key...
...
Description
DC_IN
PGND
Figure 2.18 DC-Power Jack
Figure 2.19 Recovery
21 RSB-4221 User Manual