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surroundings:
1, PC machine ubuntu16.04
2, a development board ESM335x
3, using a serial line cable (DB9) + Serial kind of the USB (DB9)
Description:
No need to install any drivers, just need to know which computer port corresponding to the port ARM board
step:
1, check the computer using the USB port
root@PC:/dev# dmesg |grep ttyUSB*
If you do not use USB, you can use the code:
root@PC:/dev# dmesg | grep tty
Figure: I use the / dev / ttyUSB0
2. Determine which ARM board using the serial port
That depends on the port's own serial cable, and is RS232 (three-wire, read write access, read-write access, grounded) or RS485 (A then A, B then B; because it is a differential signal), as well as to determine the It is the first of several mouth.
Check the product manual or user manual, look up the corresponding serial device name, mine is / dev / ttyS2
3, test the connection
ARM board using the command monitor port equipment
[root@EM335X ~]#cat /dev/ttyS2
PC, use the command to send a test message
root@PC:/dev# echo "123" > /dev/ttyUSB0
4, the effect of FIG.
The PC:
Development board:
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