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X501M Reference Manual V2.2
11
2.8 Serial connector
Function
Serial port
marking
Serial
Type
DB9 interface
Pin define
Pin 1 location: The green frame on the right.
The COM0 and COM1 serial ports are both RS232 interface level.
The mapping files in Linux system are respectively ttyS0 and
ttyTHS2 in /dev directory.
COM0 is the default kernel debugging serial port, which is used to
output c-boot, U-boot, and Linux kernel information. After Linux
kernel is started, it is used as the display terminal serial port.
TX1/TX2 default serial port setting is: 115200bps, 8N1.
Pin
Signal
Pin
Signal
1
RS232_TX0
(COM0)
2
RS232_RX0
(COM0)
3
RS232_RTS0
(COM0)
4
RS232_CTS0
(COM0)
5
GND
6
RS232_TX1
(COM1)
7
RS232_RX1
(COM1)
8
RS232_RTS1
(COM1)
9
RS232_CTS1
(COM1)
