4 channel output GPIO0~GPIO3, operation I/O interface oxA06, each bit correspondence as follows:

4 channel output GPIO4~GPIO7, operation I/O interface oxA06, each bit correspondence as follows:

Hardware definition:

GPIO on HYSTOU mini pc P12-i5-8250U:

On P12-i5-8250U, COM1 and COM2 can be changed to RS232, RS422 and RS485 from Bios, guide pls click here, other 4 COM port definition below:

TXD3+RXD3+GND = COM3 (RS232)

TXD4+RXD4+GND = COM4 (RS232)

TXD5+RXD5+GND = COM5 (RS232)

TXD6+RXD6+GND = COM6 (RS232)

Totally it is 6 COM port onboard of P12-i5-8250 mini pc.