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Hi Everyone
 
Im trying to determine the protocol behind an unknown serial data stream coming from an infrared receiver module with data coming from an IR remote control.
 
Since I dont have a scope, I tried to hook this signal to a maxim level converter so that it could be viewed on a PC terminal. I tried changing the terminal properties(baud,parity,databits,stopbits) to find a possible sense out of the data stream but no luck so far.
 
1) I was hoping someone here could recommend a terminal program like hypertrm that has some sort of protocol detection or at least autobaud detection. Or something with its properties easily changeable during runtime.
 
2) Anyone can make out anything out of the following facts? 
 
With crude techniques, i found that with each key press on the remote control, the -line goes:
- LOW for about 8.5 msec (could be the start bit/char)
- HI for about 4.5 msec
- TOGGLES hi and low for about 52msec (could be the data)
- HI for about 39.5msec  (could be the stop bit/char)
 
The remote control has 41 unique keys of which im guessing the data bits are at least 6bits (64 combinations).
 
The unit under study is a LED matrix message board with IR remote control as input.
 
3) Any software that can work as a "PC oscilloscope"? As the data may not even be in ASCII and could have its own character set. So its best to analyze the exact wave form. Buying the scope is not an option for now..too expensive and too bulky.
 
 
Any helpwill be appreciated.
 
thanks again!
 
- Chris
 
 


      

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