Relation of UART Port and device node as follow:
Pin
UART Port
Device Node
1
UART(TTL/232)A
DEBUG
2
UART(TTL/232)B
ttyUART_TTL_232_B
3
UART(TTL/232)C
ttyUART_TTL_232_C
4
UART(232/422/485)A
ttyUART_232_422_485_A
5
UART(232/422/485)B
ttyUART_232_422_485_B
DIP switch for UART Ports:
Open Apex Xavier’s bottom cover, DIP switches are shown as below:
Figure Apex Xavier DIP Switch
DIP switch settings are shown in the table below: