Instruction Manual

Hardware Information 25

M-342

2.4 Jumpers

Clear CMOS (CLCMOS)

The CMOS RAM data contains the date / time and BIOS setting

information. CMOS is powered by the onboard button cell battery.

To erase the CMOS RAM data:

1. Power down and disconnect power from the system.

2. Short pins 2-3 on JP1.

3. Reconnect power and power up the system.

4. After power up, remove the jumper cap from pins 2-3

and reinstall it to pins 1-2.

COM6 Mode Jumper Settings (JP1~3)

Short the jumper pins according to the following settings to set

COM6 to RS-232/422/485 mode:

RTC status Connection CLCMOS

Normal 1 – 2

Clear CMOS 2 – 3

RS-232 RS-422 RS-485

JP1 1-3, 2-4 3-5, 4-6 3-5, 4-6

JP2 1-2 3-4 5-6

JP3 1-3, 2-4 3-5, 4-6 3-5, 4-6