hi guys, i am just a beginner to arduino ? is it possible to interface two rs232 connector directly ..?if so how?because my project needs that...?
you can use Software serial and hardware serial library functions.
http://arduino.cc/en/Reference/SoftwareSerial .
you need to use TTl to Rs232 converter. Since arduino Receive TTL signals.
You can also use one of the Arduino models with 4 serial ports, Mega and Due for example.
Rob
Several older arduinos didn't use USB, but RS-232. You could use those as well, but may need to build your own board.
With a Max232-chip and a few capacitors you can build a circuit to convert TTL and RS-232 signals, but you can buy a built module for a few bucks as well.
TTL works with 0-5v signals, RS-232 can work with signals up to 25v. Connecting 'm without convertor may ruin parts on either side of the cable.