I have an new Arduino UNO and he works on USB fine. The ASCII-example sketch also works fine on USB with serial monitor tool.
Now I want the Arduino UNO connected with serial cable to the computer. This serial cable works fine with other devices.
The Arduino UNO has TX,RX and GND (pins) only. I disconnected USB cable and connected TX, RX and GND to the serial cable (TX-RX, RX-TX, GND-GND). I tested with the serial monitor tool, the baud rate and the serial port was right.
Now the ASCII-example sketch do not work.
Question: How is the Arduino UNO connected with/to serial cable to computer that the ASCII-example sketch works fine ?
Thanks for answers.