Advantech PCA-6181, Manual, Page: 60 / 126

3.13 Save & Exit Setup
If you select this and press <Enter>, the values entered in the setup
utilities will be recorded in the CMOS memory of the chipset. The
microprocessor will check this every time you turn your system on
and compare this to what it finds as it checks the system. This record
is required for the system to operate.
3.14 Exit Without Saving
Selecting this option and pressing <Enter> lets you exit the setup
program without recording any new values or changing old ones.