central station for subsequent upload to the central station upon
restoration of communication.
a. Inputs. Local processor inputs shall monitor dry contacts for
changes of state that reflect alarm conditions. The local processor
shall have at least 8 alarm inputs which allow wiring as normally open
or normally closed contacts for alarm conditions. It shall also
provide line supervision for each input by monitoring each input for
abnormal open, grounded, or shorted conditions using dc current change
measurements. The local processor shall report line supervision alarms
to the central station. Alarms shall be reported for any condition
that remains off normal at an input for longer than 500 milliseconds.
Each alarm condition shall be transmitted to the central station during
the next interrogation cycle. The entry control local processor shall
include the necessary software drivers to communicate with entry
control field devices. Information generated by the entry control
field devices shall be accepted by the local processor and
automatically processed to determine valid identification of the
individual present at the portal. Upon authentication of the
credentials or information presented, the local processor shall
automatically check privileges of the identified individual, allowing
only those actions granted as privileges. Privileges shall include,
but not be limited to, time of day control, day of week control, group
control, and visitor escort control. The local processor shall
maintain a date-time and location stamped record of each transaction.
A transaction is defined as any successful or unsuccessful attempt to
gain access through a controlled portal by the presentation of
credentials or other identifying information.
b. Outputs. Local processor outputs shall reflect the state of
commands issued by the central station. The outputs shall be a form C
contact and shall include normally open and normally closed contacts.
The local processor shall have at least 4 addressable outputs. The
entry control local processor shall also provide control outputs to
portal control devices.
c. Communications. The local processor shall be able to communicate
with the Central Station via RS485 or TCP/IP as a minimum. The system
manufacturer shall provide strategies for downloading database
information for panel configurations and cardholder data to minimize
the required download time when using IP connectivity.
2.4.2.1
Processor Power Supply
Local processor and sensors shall be powered from an uninterruptible power
source. The uninterruptible power source shall provide 6 hours of battery
back-up power in the event of primary power failure and shall automatically
fully recharge the batteries within 12 hours after primary power is
restored. There shall be no equipment malfunctions or perturbations or
loss of data during the switch from primary to battery power and vice
versa. Batteries shall be sealed, non-outgassing type. The power supply
shall be equipped with an indicator for ac input power and an indicator for
dc output power.
2.4.2.2
Auxiliary Equipment Power
A GFI service outlet shall be furnished inside the local processor's
enclosure.
SECTION 13720A
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