Boardcon Embedded Design EM6737 User Manual page 37

Execute the commands to perform a loopback test.
# com /dev/ttyUSB0 115200 8 0 1
# com /dev/ttyMT1 115200 8 0 1
# com /dev/ttyMT2 115200 8 0 1
Type any character and the echoed characters can be displayed on the screen.
Customize the embedded system based on
（COM4）
（UART1）
（COM2）
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