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in reply to Re^4: r/w attached infrared head on /dev/ttyUSB0
in thread r/w attached infrared head on /dev/ttyUSB0

I didnt see where it was said the perl program was killed either, and so the loop of 300 must have terminated. So i wondered if there were non printing characters being returned while the device was processing. A larger "window" might show results after some period of time.