Ohhh baby, Imma scared now lol.
@be80be, a real com port should have at least 6V of swing. But more important, it has to go negative. -3V to 3V is just not a valid RS232 range.
I have an IC, MAX485, which converts UART to RS485 and RS485 to UART.I would like to know if an IC like this, but, instead of "TTL LEVEL" UART, interfacing with I2C, exists.