Problem: Arduino Uno + Ultra Compact RS232 to TTL Converter -> Projector-Control

i already tested 9600 and 38400... My projector is the NEC M403H and i could find it in your pdf :wink:

i changed the settings of the projector already form 38400 to 9600 :slight_smile:

With the usbadapter and CoolTerm it works with baudrate 9600, I think thats not the problem.