I've asked my local vendors about the TTL to RS232 circuit with no success. I decided to look for a different way to convert Arduino's TTL to RS232 signal. I've found some information on Severino's schematic and this website: http://www.pablin.com.ar/electron/circuito/mc/ttl232/index.htm and I decid…

TTL to RS232 without Maxim's circuit

el_supremo April 25, 2012, 3:07pm 4

Why are the transmit and receive signals connected at all?

Pete