The wireless alarm transmitter is composed of three parts: the main control circuit, the channel circuit and the power circuit, and can be connected with several different detectors. Its basic working principle is: The wireless alarm transmitter converts the alarm output signals of different detectors into different address code digital signals through the information processing of the single-chip microcomputer. This group of digital signals representing information such as the alarm address and alarm type performs the carrier wave of the transmitter. After frequency modulation, the modulated modulated signal is amplified and matched by the power and sent to the transmitting antenna to be converted into space electromagnetic radiation. There is an address dial switch on the wireless alarm transmitter. The user can set the transmitter number.
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.
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.
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