Hi CCSPARKY,

I think you are on the right track with your plan as stated but you could take it one step further and make your system work faster if you set it up to have the iButton ID's stored in each 16F88. This way if anything happened to your PC, decisions regarding unlocking or denying access would strickly be up to the location micro. Setup your reader's micro to store a time stamp and button ID along with the actual activity that took place whether it was a valid access or invalid access. Then periodically you could use your PC to poll each reader micro and retreive the activity for review.

Just so you know, I have been an alarm company owner and installer for over 30 years. I deal with these types of systems all the time.

If I can be of further assistance, feel free to ask.

BobK