ADLINK NuPRO-A331 - Manual (Page 42)

28 Hardware Information
2.4 Jumpers
Clear CMOS (JBAT1)
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.
COM1/2 Mode Jumper Settings
Short the jumper pins according to the following settings to set
COM1/2 to RS-232/422/485/485+ mode.
COM1 (JP1-4)
COM2 (JP8-11)
RTC status Connection JBAT1
Normal 1 – 2
Clear CMOS 2 – 3
RS-232 RS-422 RS-485 RS-485+
JP1 - 1-3, 2-4 1-3, 2-4 3-5, 4-6
JP2 1-3, 2-4 3-5, 4-6 3-5, 4-6 3-5, 4-6
JP3 1-3, 2-4 3-5, 4-6 3-5, 4-6 3-5, 4-6
JP4 1-2 3-4 5-6 5-6
RS-232 RS-422 RS-485 RS-485+
JP11 - 1-3, 2-4 1-3, 2-4 3-5, 4-6
JP9 1-3, 2-4 3-5, 4-6 3-5, 4-6 3-5, 4-6
JP10 1-3, 2-4 3-5, 4-6 3-5, 4-6 3-5, 4-6
JP8 1-2 3-4 5-6 5-6