Hi Saurav,
The above circuit explains the functionaliy of access control & time attendence using fingerprint module. What exactly is your end application? If you want only finger print module to interface to microcontroller, then there is no need of MAX232. In the above circuit MAX232 is used to display the information on PC & LM358 is an comparator and it is not recommended unsless you need it in your application. Kindly explain your actual application & share further doubts.