Hi all!
I'm talking about invert or not the serial levels from the at the Arduino's USART. All the RS-232 transceivers always invert the signal level so the first way to get out the transceiver is always a couple of transistor of a HEX inverter (74hc04).
What i want to know if I can connect to a RS-232 port without any of these inverter buffers. Generally when you do this trick only use two resistors, 100E for TX and 10K for RX. But you must set the level invert that TTL.
Best Regards
Frank