Nextion display connected via FTDI to computer, rubbisch characters


Nextion Display NX4827P043-011C-Y
FTDI RS232 - Lan converter

On PC i use Coolterm has an Comport monitor
Settings are 9600,8,N,1 stop bit

I can program the nextion display by downloading firmware via Nextion Editor.

After firmware download, i connect coolterm, to see the RS232 data comming from nextion display and get only rubbisch characters on the screen.

When using the same nextion display on an ESP32 i can communicate with the display.

I can not figure out why FDTI connection via FTDI interface towards a PC lan port is not working.

Any help on this mather is appriciated.

Best regards,

What FTDI are you using as real RS232 is not compatible with nextion as it 15 volts or more there are 5 volt FTDI and real RS232

I use the same FTDI to connect Arduino and ESP32 RS232 ports to a PC USB and that works fine.

Check the voltage on the TX / RX pins as the FTDI can be set to 1.8 up to 5 volts the nextion is 5 volts the ESP are 3.3v

Do you understand the difference between hex and ASCII?

Make sure you select Hex view in Coolterm, otherwise yes, you’ll see the ASCII equivalent.

1 Like

Thank you for your solution.
Indeed in hex view it worked.

Best regards,