Infrared communication line in the security system. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Infrared communication line in the security system. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / infrared technology

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Large interference on the air, the ease of detecting what was transmitted over the radio and its subsequent imitation, the administrative and financial obstacles created for everyone who wants to use the radio channel in their security system (OS) *, force them to look for some other means of communication here. With the advent of semiconductor emitters capable of generating powerful IR flashes, and photodiodes with built-in optics, the infrared range has become of interest in this respect as well.

In a communication line operating in a security alarm system, three possible situations should obviously be presented differently: a) there are no violations at the protected facility; b) the object transmits an alarm signal; c) "break" in the communication channel.

*) In Russia, the transmission of security system signals by radio is allowed only in two frequency channels (see p. 10). This is for all of us. Recall that in a special state of the ionosphere, on the so-called "passage", interference blocking the radio channel can be caused not only by the signal of a neighbor located "only" 5 ... 10 km, but also by a radio transmitter remote by 1.5 ... thousands of kilometers.

Publication: cxem.net

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