JP3056811B2 - Method of setting carrier frequency of slave station in wireless communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for setting a carrier frequency of a slave station in a wireless communication system used for a security system for transmitting sensor information and the like.

[0002]

2. Description of the Related Art In a security system, a plurality of slave stations to which disaster prevention and crime prevention devices such as disaster prevention sensors and crime prevention sensors are connected and signals indicating the operation states of the respective disaster prevention and crime prevention devices transmitted from these slave stations are received. One master station monitors the operation state of each of the disaster prevention and crime prevention devices, and performs one-way wireless communication from a slave station to the master station. In a wireless communication system used for this type of security system,
By using a synthesizer circuit for the transmitting circuit of the slave station, the carrier frequency can be appropriately set to a plurality of frequencies, and by using a synthesizer circuit for the receiving circuit of the master station, the receiving frequency can be adjusted to the carrier frequency of the slave station. Some of them can be changed as appropriate.

[0003]

By the way, in setting a carrier frequency of a slave station in a conventional radio communication system of this type, a dip switch is provided in each slave station, and the carrier frequency is set by several bits of data by the dip switch. Was set. However, when the dip switch is provided, there is a problem that the miniaturization of the slave station is hindered.

[0004] The present invention has been made in view of the above points, and an object of the present invention is to provide a wireless communication system capable of easily and reliably setting a carrier frequency without using a dip switch. An object of the present invention is to provide a frequency setting method.

[0005]

According to the present invention, in order to achieve the above object, a setting command input means for giving a variable command of a carrier frequency, and a variably set carrier frequency is notified so as to be identifiable by sound or light. Notifying means and a carrier frequency setting means for setting a carrier frequency to a specific frequency in response to an input from the setting command input means are provided in the slave station, and the setting command input means is configured by a switch provided in the slave station, The notifying means changes the notifying operation according to the pressing operation of this switch or the lapse of time after pressing when the switch is pressed, and the carrier frequency setting means sets the carrier frequency of the slave station by pressing the switch or canceling the operation state. It is.

A connection terminal for connecting a sensor provided in the slave station is used as the setting command input means, and the notification means changes the notification operation according to the application of a signal to this connection terminal or the lapse of time after the application of the signal. Alternatively, the carrier frequency setting means may set the carrier frequency of the slave station by applying a signal to the connection terminal or canceling the signal application state.

[0007]

According to the first aspect of the present invention, the carrier frequency can be set by using a switch provided in the slave station, so that it is not necessary to use a dip switch, and the carrier frequency set from the notification state of the notification means is set. The carrier frequency can be easily identified and the carrier frequency can be set reliably.

According to the second aspect of the present invention, the connection terminal for connecting the sensor is used as setting command input means for giving a command for varying the carrier frequency, so that the carrier frequency can be set according to the state of signal application to the connection terminal. This eliminates the need for using a dip switch.

[0009]

1 to 4 show an embodiment of the present invention. FIG. 2 shows an example of a security system to which the present invention is applied. In this security system, a fire sensor S ₁ as a disaster prevention sensor, a gas leak alarm sensor S ₂ and an emergency push button S ₃ , a disaster prevention and crime prevention device such as an intrusion warning sensor S ₄ as a security sensor, or an emergency notification device S _{5 and the} like Are connected to each of the slave stations 2 and one of the parents monitoring the operating state of the sensors S by receiving transmission signals indicating the operating states (abnormality sensing states) of the various sensors S wirelessly transmitted from the slave stations 2. And a station (controller) 1.
FIG. 3 shows a case where the slave station 2 is integrated into each sensor S. The master station 1 includes a display unit 1a for individually displaying the operation state of each sensor S, and issues an alarm when an abnormality occurs. In the master station 1, a telephone 9
Is connected so that an abnormality can be notified by telephone using the telephone 9. Further, there is also a device provided with a function for automatically reporting abnormalities to a family member's commuting office or the like through a telephone line.

FIG. 4 shows an example of the configuration of the slave station 2.
Oscillator 21 ₁ , frequency divider 22 ₁ , phase comparator 23 ₁ , low-pass filter 24 ₁ , VCO 25 ₁ , prescaler 26
_1, CPU 28 of the programmable frequency divider 27 a PLL synthesizer circuit a ₁ includes a transmission circuit consisting of _1, the control
By controlling the frequency division ratio of the prescaler 26, the carrier frequency of the transmission signal of the slave station 2 can be variably set to an appropriate frequency. Information of the sensor S is provided to VCO 25 ₁ through the splatter filter 29 as a modulation signal indicating the information of the sensor S from the CPU 28, over VCO 25 ₁ is modulated on a carrier wave, a preamplifier 30, a power amplifier 31 and the band-pass filter 32 It is transmitted from the antenna 33 via the antenna 33. The slave station 2 has a function of adjusting the power supplied from the power supply circuit 36 to the transmission circuit under the control of the CPU 28 to adjust the transmission power.

FIG. 3 shows an example of the configuration of the master station 1.
Receiving circuit of the master station 1 even Yes using PLL synthesizer circuit a ₂ of the slave station 2 side the same configuration, a band-pass the received signal at the antenna 11 filter 12 and RF amplifier 13
Input to the first mixer 14 ₁ via a first mixer 1
4 ₁ to give the output of the PLL synthesizer circuit a ₂ as a first local oscillation signal, the frequency of the received signal at the first mixer 14 ₁ dropped into the first intermediate frequency, bandpass filter 15 and IF the first intermediate frequency enter the second mixer 14 ₂ via the amplifier 16 _1, transmitter 17 is mixed with the second local oscillation signal outputted from the further off the second intermediate frequency, IF amplifier 16 ₂ the second intermediate frequency The output amplified by the demodulator 18 is demodulated by the demodulator 18 and the low-pass filter 19
To obtain a detection output. This detection output is input to the control CPU 20 to determine the occurrence of a fire, the presence of an intruder, and the like, and based on the determination, an abnormality notification or the like is performed. By changing the division ratio of the programmable frequency divider 27 ₂ in this parent station 1, it has a suitably changeable reception frequency.

An emergency button S in the slave station 2_ThreeAnd emergency reporting equipment
Place S_FiveIn the slave station 2 having a switch as shown in FIG.
Switch to set the carrier frequency as follows:
It is. First, when starting the system, the slave station 2
When the switch SW is pressed, the slave station 2
CPU 28 determines that setting of carrier frequency has started
I do. This slave station 2 is provided with a notification means such as a piezoelectric buzzer B.
If the switch SW is kept pressed,
Variable carrier frequency with piezoelectric buzzer B over time
State. For example, if the piezoelectric buzzer B is "P"
The carrier frequency is f₁Indicates that
”_Two, And f _ThreeIs
Indicates that That is, in this case, the sounding of the piezoelectric buzzer B
The carrier frequency is indicated by a number.
The sound control of the user B is performed by the CPU 28.

In addition to the above, the carrier frequency is indicated by the number of times the piezoelectric buzzer B sounds.
Other notification methods may be adopted, and further, using a display element such as a light emitting diode, the number of times of blinking of this display element or the number of times of blinking, the variable carrier frequency is identifiably reported. Is also good. The carrier frequency is set by releasing the switch SW from the pressed state when the notification corresponding to the desired carrier frequency is made.
Is set as the carrier frequency. That is, the CPU 28 stores the setting state at this time. Note that, even if the switch SW is operated after the setting is once performed, the CPU 28 does not accept the operation as an operation for setting the carrier frequency.

In the above case, the switch SW is continuously pressed to switch the setting state, and the frequency is set at the time of release. However, the switch SW is pressed once at the start of the setting, and thereafter, the frequency is set. This indicates that the notification means changes to a different setting state stepwise according to the passage of time, and when the switch SW is pressed again at an appropriate time, the carrier frequency may be set at that time. Any method may be adopted as long as the method can set the carrier frequency.

When the carrier frequency is set as described above, the control CPU 28
Determines the frequency division ratio of prescaler 26 ₁ , and
Is transmitted on a specific carrier frequency. Here, CPU2
8 and the PLL synthesizer circuit a ₁ will function as a carrier frequency setting means for varying the carrier frequency. By the way, the setting of the carrier frequency in the above case is performed by the switch SW.
Not be employed if such has not for instance a fire sensor S ₁ provided with the slave station 2 connected. Therefore, in the case of the present embodiment, the carrier frequency is set in this type of slave station 2 as follows.

[0016] That is, in the case of this type of slave station 2 uses the connection terminals for connecting the fire sensor S ₁ as the setting command input means (not shown). For example, by applying a signal between the connection terminals at system startup connecting fire sensor S _1, CPU 2 of the slave station 2 determines the start setting the carrier frequency, the time in a state in which a signal is applied to the connection terminal As time elapses, a sound specifying the frequency at which the piezoelectric buzzer B is set sounds as in the case described above, and the carrier frequency is set at that time when the state of applying the signal to the connection terminal is released at an appropriate time. What should I do? Also in this case, the method of applying the signal is not particularly limited.

[0017]

According to the first aspect of the present invention, as described above, a setting command input means for giving a variable command of the carrier frequency, a notifying means for notifying the variable setting of the carrier frequency by sound or light, and A carrier frequency setting means for setting a carrier frequency to a specific frequency in response to an input from the setting command input means is provided in the slave station, and the setting command input means is constituted by a switch provided in the slave station. Alternatively, the notification means varies the notification operation according to the lapse of time after the switch is pressed, and the carrier frequency setting means sets the carrier frequency of the slave station by pressing the switch or canceling the operation state. The carrier frequency can be set by using a switch provided by the station, without using a dip switch, and the carrier frequency set from the broadcast state of the broadcast means. Easily identified, allows the setting of reliable carrier frequency.

Further, in the invention of claim 2, a connection terminal for connecting a sensor provided in the slave station is used as the setting command input means, and the signal is applied to this connection terminal or time elapses after the signal is applied. The notifying means changes the notifying operation, and the carrier frequency setting means sets the carrier frequency of the slave station by applying a signal to the connection terminal or canceling the signal application state. Used as setting command input means for giving commands,
The carrier frequency can be set according to the state of application of the signal to the connection terminal, eliminating the need for using a DIP switch.

[Brief description of the drawings]

FIG. 1 is a perspective view of a slave station according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a security system including the above.

FIG. 3 is a circuit configuration diagram of a master station.

FIG. 4 is a circuit diagram of a slave station.

[Description of Signs] 1 master station 2 slave station SW switch B piezoelectric buzzer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B 1/40 G08B 25/10 H04B 7/24 H04Q 9/00 341

Claims (2)

(57) [Claims] Claims 1. A plurality of slave stations to which disaster prevention and crime prevention devices such as disaster prevention sensors and security sensors are connected, and a signal transmitted from these slave stations and indicating a state of operation of each disaster prevention and crime prevention device, receives each disaster prevention. , A master station for monitoring the operation state of the security device, and performs one-way communication from the slave station to the master station by radio, and uses the synthesizer circuit for the transmission circuit of the slave station and the receiver circuit of the master station. In a wireless communication system capable of appropriately setting a frequency and a reception frequency, setting command input means for giving a variable command of a carrier frequency, notifying means for notifying the variable setting of the carrier frequency by sound or light, and the setting command A carrier frequency setting means for setting a carrier frequency to a specific frequency in response to an input from the input means is provided in the slave station, and the setting command input means is constituted by a switch provided in the slave station. The notifying means varies the notifying operation according to the pressing operation of the switch or the lapse of time after the pressing of the switch, and the carrier frequency setting means sets the carrier frequency of the slave station by the pressing operation of the switch or the release of the operating state. A method for setting a carrier frequency of a slave station of a wireless communication system. 2. A connection terminal for connecting a sensor provided in a slave station as said setting command input means, and said notification means changes a notification operation according to application of a signal to said connection terminal or lapse of time after application of a signal. 2. The carrier frequency setting unit according to claim 1, wherein the carrier frequency setting means sets the carrier frequency of the slave station by applying a signal to the connection terminal or canceling the signal application state. Setting method.