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Linear's Multi-Door controllers can be used in traditional stand alone modes supporting up to 4 doors or gates. In addition, the multi-door controllers can be used to expand installations containing Linear's Telephone Entry systems. Up to 8 controllers, supporting up to 32 doors or gates, can be linked together via RS-485 to create a network. Linear's AccessBase or AccessBase2000 software can then combine up to 8 networks to create a 64 controller network with up to 256 doors or gates.

The Multi-Door controllers are full featured access control panels. Security levels, time zones and event logs are all standard features. Users can be assigned cards, entry codes or transmitters; with all having the level of security that one comes to expect in an access control panel.

• AM3Plus: 4-portal Access Controller
  4-portal access control device for facilities with up to 10,000 residents or users, Wiegand inputs, cardreader interface, network compatible with AE1000Plus, AE2000Plus and legacy units, AXNET and AccessBase2000 compatible, includes indoor cabinet.
  
  The Model AM3Plus 4-Portal Access Controller is designed for use as a primary access control device for gated communities, parking garages, office buildings, apartments, dormitories, hotels/motels, commercial buildings and recreational facilities.
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• AM/II: 4-portal Access Controller
  4-portal access control device for facilities with up to 2,500 residents or users, Wiegand inputs, integral radio receiver, network compatible with AE-1 and AE-2, add MMxx memory, cabinet, and antenna
  
  Model AM/II is an extremely versatile access controller for creation of new stand-alone access control systems or for field expansion of existing systems. It offers a wide range of entry options, including a built-in radio for keyless entry and panic functions. Systems can be easily tailored by size. Each AM/II controls up to four ports, but can be networked to link as many as 32. For storage of over 65,000 input devices, names, and events, modular memory can be upgraded in the field.
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From garage door openers to gate operators, from loading dock doors to access control systems, from everyday entry to high security, Linear makes radio controls to cover the industry's diverse range of applications. Single and multi-channel transmitters and receivers can be mixed and matched within product families to address just about any user need.

• Delta3: Offers 310 MHz frequency and 256 codes.
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• MegaCode: Offers 318 MHz frequency and adds the security of over 1,000,000 codes.
• MultiCode: Offers 300 MHz and 310 MHz frequency with 1,024 codes.
  
  
• DTKP: Keypad Transmitter
  Surface or gooseneck mount wireless keypad for indoor/outdoor applications, built-in transmitter and antenna, keystroke lockout timer, keypad lighting, 9-volt battery powered, transmits any of the 256 codes.
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  Features:
  * Activates multiple Delta-3 receivers
  * Backlit keys for easy viewing
  * Mounting hardware supplied
  * Power: 9 V battery
  * Frequency: 310 MHz
  * Codes: 1-8 digit PIN
  * Dimensions: 7.5 x 2.5 x .875 inches