Reply To: I connected the RS-232 output of the old scale directly to the Pi 4 GPIO, and garbage characters are coming in

Solved, thanks.I couldn’t find a USB-RS232 converter, so I got a MAX3232 module from the electronics guy. I connected it, still got garbage, then as Esra said I crossed pins 2 and 3, and the lines started coming in properly. I also turned off the serial console, the login screen disappeared. GPIO15 also came out fine, I got lucky.Thanks to Tuğba’s note, weight_kg is going out as a number from the very start, and it’s being plotted as a graph on the dashboard.