Clear Cmos (J2); Compactflash Interface (Cn2); Table 4-2: Clear Cmos (J2) - Advantech HMI-640S User Manual

4.7.1 Clear CMOS (J2)

This jumper is used to erase CMOS data and reset system BIOS
information.
The procedure for clearing CMOS is:
1. Turn off the system.
2. Short pin 2 and pin 3.
3. Turn on the system. The CMOS is now cleared.
4. Turn off the system. Short pin 1 and pin 2.
5. Turn on the system. The BIOS is now reset to its default
setting.

Table 4-2: Clear CMOS (J2)

Function
Protect*
Clear CMOS
* default setting
4.8

CompactFlash interface (CN2)

This socket accepts an IDE-compatible CompactFlash memory
card.
The CompactFlash interface uses a primary IDE channel, which
should be set as the master channel.
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