How to check Serial port continuously

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Avadhoot Telepatil
Avadhoot Telepatil on 26 Nov 2014
Edited: Avadhoot Telepatil on 26 Nov 2014
My task is to capture image only when char 'A' is received through COM port. So How to contineously monitor COM port to check whether data is received or no on COM port.

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