AAEON PFM-C42C - Manual (Page 25)

P C / 1 0 4 P e r i p h e r a l M o d u l e P F M - C 4 2 C
PFM-C42C Quick Installation Guide 1-25
setserial /dev/ttyS5 port 0xe100 irq 9 uart 16950 baud_base 115200
4. Please re-start your computer.
5. Make cat /proc/tty/driver/serial command to see if the
display is as following, if yes you already set it up.