AAEON TKS-G21-QM77B - Manual (Page 69)

E m b e d d e d B o x T K S - G 2 1 - Q M 7 7 B
Digital IO Port Configuration
Options summary: (default setting)
Input GPIO1-GPIO4 Direction
Output
Set GPIOx as Input or Output
Input GPIO5-GPIO8 Direction
Output
Set GPIOx as Input or Output
Hi Output Level
Low
Set GPIO output level when used as output pin
Chapter 3 AMI BIOS Setup 3-32