I am N. Srinivasan from Sri Ramachandra University chennai. We are currently working with MicroPEM version 3.2 (an instrument for our particulate matter measurement in our research study) and we are experiencing problem in connecting the air sampler with the desktop or laptop for data download/launch/resetting/adjusting flow rate. We tried connecting the air sampler with different operating systems containing different version of microPEM software (ver 1.6 and ver 2.0 software), but we are still unable to connect the air sampler with the desktop. Please help us by providing a guideline or solution to overcome this connectivity issue as soon as possible.