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Electric Locking

The single door node, in effect, is a stand alone access control system.
The door controller makes all the decisions for that door.
Below is a block diagram of the door controller, which explains the operation of each element:

Input & Output	This provides the interface between external devices such as, card readers, exit buttons, door contacts & the locking device.
Communications	The communications allows many smart door nodes to communicate on a single cable back to a PC.
Power Supply	The PSU section provides all power for the electronics and one average D.C locking device.
Memory, Clock & Calendar	The memory stores all details such as time, date, cards and set-up information specific to that door. Also stored in memory are the last 457 transactions (events) that have occurred.

It is important to understand the normal operation of a single door node. The logical operation is as follows:
A card or token is presented to one of the card readers, its electronic ID is sent to the door controller.
It is then compared against the door controller's memory for a match.
If there is a match the ID is then tested for validity of time & day against the clock/calendar.
Finally the door controller unlocks the door if both of the above results are true. The doors magnetic contact monitors the status of the door and posts a message to memory if it is held open after a programmable period. Finally the card number of the card just used is also stored in memory along with the current time & date.
This data is stored in the controller until the PC polls the door controller or 457 events occur, in which case it will be overwritten.
An event transaction is generated for any event that occurs :
- 71 Access granted
- 72 Access denied
- 73 Egress
- 74 Door forced (opened without card)
- 75 Door held (open too long)
- 76 Door closed (after alarm 74 or 75)
- 77 Host opened door
- 78 Host closed door
- 79 Host granted access
- 80 Intruder alarm set
- 81 Intruder alarm unset
- 82 Access denied Invalid Time Zone
- 83 Access denied Card Suspended
- 84 Access granted Holiday
- 85 Access granted Alarm Zone set
- 86 Access denied Alarm Zone set
- 87 User Log In
- 88 User Log Out
- 89 User Access Denied
- 90 Cold reset / watchdog