4
Interfaces
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4.1.2
RS-232
The RS-232 interface is normally used as additional console device for Linux. It can also be configured for
use by a custom application.
The TX and RX signals use the power supply GND pin 1 as reference potential. Make sure that the remote
device uses the same GND reference.
Default settings for the serial interface:
Setting
Value
Baud rate
115200 bps
Parity
None
Data bits
8
Stop bits
1
Flow control
None
Please note that the bootloader U-Boot also uses the serial interface during the boot process. It can be in-
terrupted if a character is received on the RS-232 interface after power-on. The device will then wait for
user input and not boot into the OS.