java - How to detect signals at the serial COM1 port? -

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I have an infrared device (both transmitter and receiver). I have connected the receiver to a serial COM port and I send an IR signal using the transmitter.

I want to monitor those signals and whenever there is no signal, send another thread (SMS by sending code).

If I check the signs on hiperterminal, then I get some unreadable values.

To see if a should not be a carrier should be seen as a value, no data has been received, why do I execute the second thread?

Example 

  if (signal! = Null) {// do notin} else {// thread2 (); Go head to the Free Serial Port Library under Windows, Linux or Java.

OSX.


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