When programming a door on the NAC, there are two ways to specify an
interlock door: either another door on the same NAC, or a door on a separate
controller.
The NAC has simplified configuration of interlocking doors on the same
controller.
Interlock door on same controller
When programming the door, navigate to the door’s Hardware tab and tick the
required interlock doors in the Interlock doors field.
When an attempt to open/unlock the programmed door occurs (either from user
action or from management software), the NAC will check all other locally linked
doors to ensure that no other door is unsecure, before allowing the door to open.
When internal interlocking option is enabled on NAC, a special interlocking timer
(300ms if only internal interlocking is enabled) is started when a user credential is
presented. Any repeated attempt to gain access by providing a user credential
while the timer is running and the remaining time is greater than 100ms will
cause Access Denied Void and 7 error beeps. If access is granted and the door
becomes in access, this waiting time is bypassed and all the consequent
credential requests are processed without that delay.
A proposed sequence of user action on the interlocked doors is below:
- Present a credential (hear a single beep if it's a card or press enter if it's a pin);
- Wait for the NAC to confirm. NAC confirms with either 2 beeps if the credential
has a right to access or 7 beeps in case of a wrong credential. The waiting time
may be less than a second if no external interlocking is enabled or about 3
seconds if external interlocking is enabled;
- Proceed to the next step.
Interlock door on external controller
There are three external input fields provided for the NAC to check for
interlocking on external controllers.
To interlock with a door on an external controller, a contact from the external
door must be wired to a spare input connected to the NAC, and vice versa.
When programming the door on the NAC, navigate to the door’s Hardware tab
and define the locations of the inputs connected to external door contacts in the
External input fields.
When an attempt is made to open/unlock the programmed door (either by user
action or from management software), then the NAC will check the state of these
external inputs. If any of the external inputs is unsealed, access will be denied
immediately.
If all external inputs are sealed, the NAC will activate the “Door unlocked” event.
A macro should be created which takes the “Door unlocked” event and activates
a relay linked to the other controller(s).
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