Interface rs-232 with Arduino Uno


Have a question, how to interface the Arduino Uno with RS-232? I know that its -12V, 0V. So I need to know how to convert this.

Or can I use the NewSoftSerial library, and directy put RS-232 Tx and Rx on a digital port?


You would need a LEVEL converter, like a MAX232.

SCHMARTBOARD makes a pre-built board you could use:

Thank you very much!

I think I should go with this one: