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The Dual Door Controller (DDC) is an access control field device for MDI’s Integrated Digital
Controllers. The DDC functions as a door interface for the Network
Local Controller (NLC) and Network Communications Board (COMM),
integrating card readers and associated door hardware into a single
package.
The
unit is configurable for two doors with entry readers or for one
door with entry and exit readers. |
The DDC memory stores 20,000 card records. All access control decisions
for its two readers are made by the DDC using this database. Cards that
have not been used for a preset number of days are removed from the DDC
database and replaced with more active cards.
When
a card’s record is not found in the DDC database the card data is
passed to the NLC for the access control decision. If communication between
the DDC and NLC/COMM is disrupted the DDC continues to make access decisions
for its 20,000 cardholders. Up to 5,000 events are stored at the DDC and
passed to the NLC/COMM when communications is restored.
The
DDC features 2 reader ports, flexible input and output configurations,
FLASH memory for application programs (firmware) and SDRAM for cardholder
database and event storage. The interface between the DDC and NLC/COMM
utilizes industry standard RS-485 communications protocol that allows
the DDC to be located up to 4000 feet from the NLC/COMM.
DDC
FEATURES
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Supports
2 doors with Entry Readers or 1 door with Entry/Exit Readers
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Each
reader port has connections for power, data, 2 LEDs and Buzzer
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Supported
readers include Magstripe, Wiegand, Barcode, Proximity, Biometrics,
and SmartCard
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Supports
industry standard and custom card formats
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Stores
20,000 cardholder database
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Access
decisions are made at the DDC using local database, even during loss
of communication with NLC/COMM
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Stores
5,000 events
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Access
decisions are made at NLC when card not found in DDC database
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Inactive
card records are removed from DDC database and replaced with active
cards
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4 Supervised
inputs: 2 door monitor and 2 alarm inputs
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8 Non-supervised
inputs: 2 Request-to-exit (REX), 2 tamper and 4 Auxiliary inputs
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6 Form-C
output relays (3 per door): door lock, alarm and spare
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Accepts
6.0 - 16.0 Vdc power source
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Downloadable
FLASH MEMORY eliminates the need to change EPROMs for applications
programming and system upgrades
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RS-485
bus remote installation up to 4000 feet (1300m) from NLC/COMM
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