Last line indicates that the console is enabled on the serial port ttyAMA0, so we disable it The output is something like this ~ $ dmesg | grep tty To search for available serial ports we use the command dmesg | grep tty Here we use Raspberry Pi 2, and we connect a RS232/TTL 3-5,5V adapter to pins 4 (5V), 6 (GND) ,8 (TX),10 (RX) of Raspberry, obviously connect tx with rx and vice versa. ), the serial port console login needs to be disabled. To be able to use the serial port to connect and talk to other devices (e.g. This can help to fix problems during boot, or to log in to the Pi if the video and network are not available. By default the Raspberry Pi’s serial port is configured to be used for console input/output. We will use the serial port available on Raspberry with a RS232/TTL 3-5,5V adapter and a USB-serial adapter. N this tutorial we will see how to use the serial port on Raspberry Pi.
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