RS232 Serial Interface

With this interface data from the Arduino / ATmega 328p and others with Rx/Tx connections can be send to and saved on a PC if the Arduino program is made to do so

We use Putty as the client
An simple alternative is screen. Use (adjust the baud rate to your needs)

screen /dev/ttyACM0 115200

RS232 interface from China

Black with cable, Blue with cable

Wire in the cable	Function
Red	+5V not to be connected
Black	Ground
Green	Rx on the Arduino side. Pen 2 of the ATmega328p
White	Tx on the Arduino side. Pen 3 of the ATmega328p

Works on default settings:

dev/ttyUSB0
9600 baud
8 data bits
1 stop bit
No parity
No Flow control

Debugging

Unable to open connection to devttyACM0
Unable to open serial port

Probably the serial monitor of the Arduino IDE is also open

Other connection issues

If Putty gives an connection error you can try

stty -a -F /dev/ttyUSB0
lsusb
lsmod | less
ls /dev/tty*
dmesg | less
If you use an USB hub connect the serial interface directly (via an extension cable) to an USB port on the motherboard

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RS232 Serial Interface

RS232 interface from China

Debugging

Other connection issues