The Johnson Controls CK-721 is a 32-bit Wiegand format card key used for physical access control systems. It is a passive, programmable credential that allows authorized personnel to gain entry to secured doors, gates, or areas by presenting it to a compatible card reader.
The “Card Key” style is a thick, credit-card-sized token, known for its durability.
Key Details from Your Part Numbers
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Model: CK-721
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Johnson Controls Part Number (PN): 27-4805-5
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SEO (Search-Optimized) Product Description: Johnson Controls 32-Bit Wiegand Card Key, Model CK-721, for Access Control Systems.
Technical Specifications & Features
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Technology: Wiegand 26-bit (standard 32-bit internal format). This is a very common and reliable technology that uses a trio of wires to transmit data.
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Format: The “32-bit” refers to the total data capacity. Typically, this is divided into:
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8-bit Facility Code: Identifies the building or site.
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16-bit ID Number: The unique identifier for the individual card.
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8-bit Parity Bits: For data integrity and error-checking.
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Compatibility: This card is compatible with a vast range of access control systems that support the Wiegand 26-bit format, including:
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Johnson Controls / Simplex / Cardkey systems (e.g., P2000, C-Cure 9000, many older systems).
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Many other third-party access control panels from manufacturers like Honeywell, Software House, RS2, and others that have a Wiegand reader input.
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Physical Description:
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Style: Rigid, PVC card key. It’s thicker and more robust than a standard magnetic stripe card.
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Finish: Typically a white or light-colored core with a printed design.
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Keyring Slot: Most versions have a hole punched in them, allowing them to be carried on a keyring.
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Common Use Cases
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Corporate Offices: For entry into main offices, server rooms, and restricted areas.
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Hospitals and Healthcare: Access to staff entrances, pharmacies, and record rooms.
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Industrial Facilities: Entry to gates, control rooms, and manufacturing floors.
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Educational Institutions: For faculty and staff access to buildings and labs.
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Government Buildings: Secure access for employees.
