AR-B1890 User’s Manual
15
Jumpers Setting OPEN 1 - 2 - 3 SHORT 1 - 2 SHORT 2 - 3
□ ○ ○ ■ ● ○ □ ● ●
1 2 3 1 2 3 1 2 3
5V 3.3V
1 □ ○ 2 2 ● ● 3
Protected Clear CMOS
1 ■ ● 2 2 ○ ○ 3