Arduino newbie here...but trying to get an Arduino to talk directly to a Barco projector via RS232. I've confirmed that I have my commands correct in comparing the commands that I send via my computer/hyperterminal and watching the rs232 output of the Arduino...the commands I send from the computer via RS232 to the projector work, but the exact same commands via Arduino do nothing. My hunch is that this is because the RS232 voltage levels coming out of the arduino are not to the +9v/-9v that the projector is looking for...
So, my question is...how do I get the RS232 out of the Arduino up to the +9v/-9v RS232 spec??
Thanks so much!