Apollo Inc.

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ADA-10/11 Digital Door Strike/Relay Control Module

The ADA-10/11 digital receiver module is used in applications where secure control of remote loads such as door strikes are required. Up to 16 ADA-10/11 receivers can be multidropped from one card reader. The sender in the card reader encodes the control information into a digital data stream which is decoded by the ADA-10/11 modules. Each module must recognize its unique address before switching its electrical load. Up to 16 unique addresses are sent to the ADA-10 receivers. In most access control systems the wiring between the door strike and the card reader controller is vulnerable to attack. An intruder need only apply a voltage or ground at this point to control the strike. The ADA-10 prevents control of the door in this fashion, since an encoded digital signal is required to control the strike. The ADA-10/11 can be mounted in a protected area near the strike with only the digital encoded signal going to the strike location. Thus control of the strike is removed from the reader and protected between the access controller and the strike. The design of the ADA-10/11 module allows easy retrofit of existing installations. The ADA-10 units are sealed, potted and take very little space and ADA-11 are smaller circut boards secured in a plastic mount. The receiver can be mounted in the door frame behind or adjacent to the door strike. The unit address for the receiver is field configurable by use of jumpers extended from the potted unit.


  • Digital secured control from reader or controller to door strike
  • Signal is decoded at strike/Simple installation
  • Up to 16 unique addresses are decoded by the ADA-10/10 receiver
  • Digital receiver mounts behind the strike
  • Low cost/Low power/Occupies little space
  • Sender is built into card readers
  • Sender output communications link has a high noise immunity using a continuous digital data stream
  • Sender to receiver can be up to 1000 feet (300 m.)
  • Single pair twisted cable 20-22 AWG
  • Receiver is jumper selectable for 12 or 24 Vdc
  • Operates off door strike supply
  • Receiver input is optically isolated
  • Fail safe operation (in absence of valid data, output is forced to OFF)
  • Receiver is protected against reverse voltage
  • Receiver output switch supports up to 2 A at 24 Vdc continuous operation
  • Receiver output load can be resistive or inductive
  • No external diode is required if load (strike) is located 6 inches or less from ADA-10


Digital relay modules are available in two formats:

ADA-10 -- Potted and hermetically sealed unit for reliable operation (3.75W x 1.5H x 0.6D in)

ADA-11 -- Circuit board in snap-in mount (3.2 x 0.875 x 0.750in) (81 x 22 x 19mm)

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