The basic composition and working principle of wireless alarm transmitter
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In addition, most wireless alarm transmitters are equipped with self-test setting switches. When they are set to the self-test state, passive self-test functions can be realized. At this time, if the self-checking address number set in the wireless alarm receiver includes the address number of the alarming transmitter, the wireless alarm receiver will issue a self-checking alarm when the alarming transmitter malfunctions or is damaged. .
Wireless alarm transmitters are generally AC and DC power can be used. Normal use of AC power, when the power failure can be automatically converted to DC power supply, and alarm display AC power loss.
In order to ensure that the alarm signal from the wireless alarm transmitter can be reliably received by the wireless alarm receiver, the wireless alarm transmitter generally adopts the transmission mode of continuously transmitting the alarm information for multiple times.
The basic working principle of the wireless alarm receiver: the high-frequency modulation signal received by the antenna is converted into a mid-band signal after being mixed and filtered with the local oscillation signal, and then the demodulation circuit demodulates the alarm number sent by the original transmitter. signal. The digital signal is divided into two channels, which are sent to the AND gate after being judged and shaped respectively to further remove the interference. The output signal of the AND gate is sent to the microprocessor for further processing. After being decoded, it is converted back to an analog electrical signal. Then the acoustic and optical alarms are driven, and the number of alarms, the number of alarm addresses, and the number of alarms are displayed on the panel. The type, alarm time, etc., print out the above alarm information at the same time. When there are multiple alarms, alarm information can be stored and the on-duty personnel can query the keypad at any time. 