5. Function Illustrations
M81-X Series User’s Manual
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5.9. Serial Port Header “COM2”
It is a 10-Pin box header that used for serial devices such as a mouse, fax/modem
and so on.
This serial port is identified by the system as COM2/4.
5.10. Battery “BAT1”
It is a coin-cell style Lithium CR2032 battery is used to provide power to the RTC and
CMOS memory.
The battery has a three years life if the system is not powered up. When the system
powers up, the power for the RTC and CMOS RAM is supplied from the 3.3V power
supply to extend the life of battery.
Replace if BIOS does not keep its settings.
