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Attaching to a Raspberry Pi's Serial Console (UART) for debugging | Jeff Geerling
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Serial HAT (RS232) - * Raspberry Pi
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Activate the TTL serial port of the Raspberry Pi and verify that it is working. – Howto Raspberry Pi
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pi 3 - Unable to read the RS232 attached GPIO pins the same way as USB serial port on Pi3 - Raspberry Pi Stack Exchange
