PIR connection

Hello: I have bought a PIR BENTEL VISUS99 (model a) http://www.secpoint.it/listing/Manuali/Antintrusione/Bentel/VISUS99.pdf,

and I don´t know how to connect to arduino. I was looking for tutorial PIR and only have three cables: GND, +5V and OUTPUT, but this VISUS99 PIR have two for 12V that I use a power supply but have two more cables to connect (N/C), Do you know how to do it?. Do I have to put any resistor to get pir input? thank you very much.

Unfortunately the manual doesn't tell much. The sensor apparently needs 12 volt to run, the output seems a relay. If it is, you could read it as a switch, but I'd use a multimeter first to be sure.

Most cheap PIRs will have a simple relay output for compatibility with legacy alarm systems; some will have both NO and NC connections. I'm afraid I don't read Spanish.