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mITX-SKL-H – User Guide, Rev.1.1
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8.9.
Serial COM2 Port (J35)
The mITX-SKL-H supports one RS422/485 serial port. Full-duplex and half-duplex can be configured from the BIOS
menu.
Table 22: Pin Assignment Serial COM 2 Port (J35)
Pin
Signal
Type
Ioh / Iol
Pull U / D
Note
1
RS485_TX1-
O
Data (-) in half-duplex mode
2
RS
I
3
RS
O
Data (+) in half-duplex mode
4
RS485_RX1-
I
5
GND
PWR
Signal Description
Signal
Description
RS/-
Transmitted Data differential pair sends data to the communications link.
RS/-
Received Data differential pair receives data from the communications link.
GND
Power Supply GND signal