Hi, thanks for your reply.
I am using uCam serial TTL JPEG camera module.
I do not have my code yet as I could not sync the camera which requires me to send a hex command "AAh 0Dh 00h 00h 00h 00h" and receive an ack "AAh 0Eh 0Dh xx 00h 00h.
I am quite a beginner with the arduino programming, please help...