Simple RS232 interface with Newsoftserial?

Han anyone implemented a simple receive only interface from RS232 using a circuit to clamp levels to 0 and 5v, and the inverting option in Newsoftserial? I don't want to redesign something that others have already developed.

Paul

using a rs232 <> serial converter (I have the “p3” kit from modern device) it pretty much does not matter where the signal is being sent from, as long as it is valid

Thanks for this. I had a look at the circuit of the P3 and there is a shottky diode clamping the voltage to ground but it looks as if the input voltage could exceed the supply rail. Maybe the 74HC04 has its own clamping diodes but I'm not sure whether the Arduino input pin has one.