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  2. List of transponder codes - Wikipedia

    en.wikipedia.org/wiki/List_of_Transponder_Codes

    Code that pilot shall set in the absence of ATS instructions related to code setting, unless when not receiving air traffic services. [12] US: Non-discrete code assignments in accordance with FAA Order JO 7110.65, 5-2. Also for use in oceanic airspace unless another code is assigned by ATC. [3] US: External ARTCC subset.

  3. Rolling code - Wikipedia

    en.wikipedia.org/wiki/Rolling_code

    Remote controls send a digital code word to the receiver. If the receiver determines the codeword is acceptable, then the receiver will actuate the relay, unlock the door, or open the barrier. Simple remote control systems use a fixed code word; the code word that opens the gate today will also open the gate tomorrow.

  4. RC-5 - Wikipedia

    en.wikipedia.org/wiki/RC-5

    Each bit of the RC-5 code word contains 32 carrier pulses, and an equal duration of silence, so the bit time is 64×27.778 μs = 1.778 ms, and the 14 symbols (bits) of a complete RC-5 code word take 24.889 ms to transmit. The code word is repeated every 113.778 ms (4096 ÷ 36 kHz) as long as a key remains pressed.

  5. Remote keyless system - Wikipedia

    en.wikipedia.org/wiki/Remote_keyless_system

    A remote control for a keyless entry system built into an ignition key: pressing a button on the key unlocks the car doors, while another button locks the car and activates its alarm system. A remote keyless system (RKS), also known as remote keyless entry (RKE) or remote central locking, is an electronic lock that controls access to a building ...

  6. Police code - Wikipedia

    en.wikipedia.org/wiki/Police_code

    A police code is a brevity code, usually numerical or alphanumerical, used to transmit information between law enforcement over police radio systems in the United States. Examples of police codes include " 10 codes " (such as 10-4 for "okay" or "acknowledged"—sometimes written X4 or X-4), signals, incident codes, response codes , or other ...

  7. Emergency service response codes - Wikipedia

    en.wikipedia.org/wiki/Emergency_service_response...

    Code 1: A time critical event with response requiring lights and siren. This usually is a known and going fire or a rescue incident. Code 2: Unused within the Country Fire Authority. Code 3: Non-urgent event, such as a previously extinguished fire or community service cases (such as animal rescue or changing of smoke alarm batteries for the ...

  8. Car alarm - Wikipedia

    en.wikipedia.org/wiki/Car_alarm

    An early version of a car alarm for use as a theft deterrent was invented by an unknown prisoner from Denver in 1913. [1] This version was manually armed, and triggered when someone tried to crank the engine. A later alarm inspired by an early version of a remote starter was published in 1916. [2]

  9. SOS - Wikipedia

    en.wikipedia.org/wiki/SOS

    SOS is a Morse code distress signal ( ), used internationally, originally established for maritime use.In formal notation SOS is written with an overscore line (SOS), to indicate that the Morse code equivalents for the individual letters of "SOS" are transmitted as an unbroken sequence of three dots / three dashes / three dots, with no spaces between the letters. [1]