Asus AAEON PICO-KBU4 User Manual page 17

I/O
Serial Port
Audio
DIO
Expansion Slot
SIM
TPM
Touch
Chapter 1 – Product Specifications
COM1: RS-232 x 1
COM2: RS-232/422/485 x 1 (Ring/ +5V/ +12V)
Line-out x1
4-bit (2-in, 2-out)
M.2 E-Key (2230)
BIO ( optional)
I2C x 1 or SMbus x 1
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