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Testing the serial ports
You will need:
- The machine to be tested
- Screen
- Keyboard
- Crossover or "null modem" serial cable
- Connection to the internet
Connect the screen, keyboard and serial cable, then power the machine up. Log on to the desktop.
First, make sure that the
screen program is installed. Open a Terminal window and run the following commands.sudo apt update
sudo apt install -y screen
Now open a second Terminal window.
Run one of the following commands in each of the terminal windows:
sudo screen /dev/ttyUSB0 19200
sudo screen /dev/ttyUSB1 19200
After running each command, the console will go blank with just a blinking cursor. Now run the following tests
- Click on the first terminal and type some text. It should appear in terminal 2
- Click on the second terminal and type some text. It should appear in terminal 1
If either of these tests fail, please double check the isolated port has been correctly installed.
Assuming both tests pass, simply close the terminal windows.
Last modified 2yr ago