New answers tagged arduino-mega-2650
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The accepted answer didn't work for me. Everything received on the serial port was repeated back to the serial port, sending the printer into a confusing loop. There is more information about that in this answer: https://unix.stackexchange.com/questions/42964/unexpected-results-testing-serial-loopback-using-echo-and-cat
The key is to use a command like this ...
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