The Johnson Controls (formerly Cardkey) CK721-700 is a field-installed network controller module designed for the System 700 line of integrated access control and security management systems.
Its primary function is to act as a communications hub and intelligent field panel. It connects downstream door controllers, input/output modules, and reader interfaces to the central host computer (running the P2000 or similar software) via a high-speed network, typically over Ethernet or a proprietary backbone.
The “BROKEN FROM SIDE” descriptor in your query strongly suggests this specific unit is a used or salvaged component that has been removed from a larger installed system cabinet or enclosure, likely resulting in physical damage to its casing or mounting points.
Key Features & Specifications:
-
Manufacturer: Johnson Controls (legacy Cardkey product line).
-
Model: CK721-700 Network Controller.
-
VOLTS: 24VDC
-
AMPS: 24VA MAX
-
FUSE: NA
-
Part Number: 27-4805-05 (This is the specific factory part number for ordering).
-
Function: Network Controller / Intelligent Field Panel for System 700.
-
System Compatibility: Core component of the Cardkey System 700 / P2000 access control system.
-
Typical Use: Manages communications between the central server and field devices (door controllers, readers, locks, alarm inputs, relay outputs). Handles event processing, door schedules, and alarm monitoring locally, even if communication to the host is temporarily lost.
-
Connectivity: Features connections for system power, network communication (e.g., Ethernet), and downstream RS-485/data loops to other panels and devices.
-
Condition Note: Physical damage reported (“Broken from side”). This likely affects the metal housing, mounting ears, or internal components if the damage was severe. The unit may be non-functional or require careful inspection and repair.
