Hi. This might sound hard on you but access control is not for beginners. 
And going into a fire control without even talking to the company is a NO NO.  
  
Size of the install the fire alarm company also needs to know what you are doing since there system needs to control part of your system 
  
No I would never connect to something like that without going through the proper procedures. I just through in that info in case it was a help.