JPS6320206Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a wireless transmitter used in fire alarm systems, crime prevention systems, etc.
The purpose of this is to transmit wireless transmission that can transmit mutually distinguishable input detection signals corresponding to each input signal without interference using the same carrier wave even when multiple input signals are input at the same time. It is about providing the equipment.

Conventionally, in a wireless fire alarm system in which fire detectors such as heat detectors and smoke detectors are installed in multiple locations to notify the occurrence and location of a fire, each fire Sensor 1
A wireless transmitter TX is provided in response to the output of the fire detector 1, and when the output of the fire detector 1 is obtained, an input detection signal corresponding to the output of the fire detector 1, that is, the input signal of the transmitter TX, and that can be distinguished from each other, that is, the fire detection signal was started to be transmitted from the transmitter TX. This fire detection signal X is a signal obtained by modulating a carrier wave of the same frequency with a unique code signal assigned to each fire detector 1. However, in such a conventional example, a transmitter corresponding to each fire detector 1
Because the timing of the transmission from the TX is not synchronized, the two fire detectors 1 ₁ ,
1 _{and 2} are activated almost simultaneously, the transmitters TX ₁ ,
Fire detection signal X ₁ transmitted from TX ₂ ,
There was a problem in that _X2 caused interference, making it impossible to transmit accurate fire information. For example, as shown in Figure 3, a fire detection signal is sent at the same time as a fire occurs.
When fire detection signal X ₁ is transmitted and fire detection signal X ₂ is subsequently transmitted because the fire area has become larger, until fire detection signal X ₂ is transmitted (section A)
The fire detection signal X ₁ is accurately transmitted by the reception display device 20, but from this _{point on (section B), both fire detection signals X 1 and} , fire detection signal X ₁ ,
There was a problem where it was judged as if X ₂ had stopped. The present invention has been made in view of the above points.

Examples will be described below using figures. Fourth
The figure and FIG. 5 show an embodiment of the present invention.
S ₁ to S ₈ are output contacts consisting of normally closed contacts of the fire detectors 1 ₁ to 1 ₈ ; 2 ₁ to 2 ₈ are latch circuits that latch the output states of the fire detectors 1 ₁ to 1 ₈ , that is, input signals;
3 is a readout circuit that sequentially reads out the outputs of the fire detectors ₁₁ to ₁₈ latched to the latch circuits ₂₁ to ₂₈ , and the readout circuit 3 is composed of NAND circuits _N9 and _N10 and a NOR circuit _NO1. An output detection circuit 4, an RS flip-flop 5 consisting of two NAND circuits,
Astable multivibrator 6 consisting of a NOR circuit and an inverter, and a daycade counter 7
and a gate circuit 8 consisting of an inverter I ₁ , NAND circuits N ₁ to N ₈ and OR circuits O ₁ to _{O 8} , and as shown in the time chart in FIG. When the outputs 1 ₁ to 1 ₈ are obtained, the data latched in the latch circuits 2 ₁ to 2 ₈ are sequentially read out. In the diagram
V _F is the output of the RS flip-flop 5, V _M is the output of the astable multivibrator 6, Q ₁ to Q ₉ are the outputs of the decade counter 7, V _N1 to V _N8 are the outputs of the NAND circuits N ₁ to N ₈ , and V _R is a reset signal obtained by inverting the output _Q9 of the decade counter 7 using the inverter _I2 , and V _O2 and V _O8 are the OR circuits _O2 and _O8 when the outputs of the fire detectors ₁₁ and ₁₈ are obtained. The outputs V _O1 , V _{O3 .} . . of the other NOR circuits O ₁ , O ₃ . . . remain at H level. The output V _O1 of this OR circuit O ₁ ~ O ₈
~V _O8 is a unique code generation section 9, a transmission control section 10,
The transmission unit 13 receives input detection signals X ₁ -X that correspond to the respective fire detectors 1 ₁ to 1 ₈ and are distinguishable from each other. ₈ will be sent in sequence. The operation of the transmitter 13 will be outlined below.
The transmission control unit 10 is formed by a switching transistor T ₁ for controlling power supply from the battery (B) and a light emitting diode LD ₁ for displaying operation.
A signal _V'F obtained by inverting the output of the flip-flop 5 by the inverter _I3 is input, and the switching transistor _T1 is turned on for a certain period of time after the output of one of the fire detectors ₁₁ to ₁₈ is obtained. As the light emitting diode LD ₁ lights up, the transistor T ₂ ,
Power is supplied to the unique code generation section 9 and the oscillation modulation section 12 via a constant voltage circuit 11 made up of _T3 . The unique code generation section 9 is formed of NAND circuits _N11 to _N16 , analog switches _AS1 to _AS6 , channel setting switches _SW11 to _SW14, and a modulated wave generation _ICM . Shift pulses SP ₁ to _{SP 6} as shown in FIG. 7 are output from the t ₁ to _{t 6} terminals of the modulated wave generation IC _M , and on the other hand, the IN ₁ of the modulated wave generation IC _M
~ When the IN ₄ terminal becomes H level, it is used for modulated wave generation.
Signals of ₁ to ₄ frequencies are output from the output terminal OUT of the _ICM . Therefore, when the channel setting switches SW ₁₁ to SW ₁₄ are switched as shown in the figure, for example, when the fire detector ₁₂ is activated and the output V _O2 of the OR circuit O ₂ becomes L level,
A modulated wave consisting of a unique code signal that is a combination of six signals of frequencies ₁ to ₄ in time series as shown in Figure 8.
V _MD is now output. Here, the channel setting switches SW ₁₁ to _{SW 14} are used to set channels when a plurality of fire transmitters and reception display devices are provided. This modulated wave
V _MD is input to an oscillation modulator 12 consisting of a carrier wave oscillation transistor T ₄ and a modulation transistor T ₅ , and the carrier wave 260 MHz is amplitude-modulated by the modulated wave V _MD , and a fire detection signal X ₂ is transmitted from the antenna 12a. Ru. Note that the other fire detection signals X ₁ , X ₃ . . . are sequentially transmitted in the same manner. The fire detection signals X ₁ to _{X 8} transmitted in this way are received by the receiving section 21 of the reception display device 20, and the code identification section 22 converts them into unique code signals of the received fire detection signals X ₁ to _{X 8} . Based on this, it is identified which fire detector ₁₁ to ₁₈ has activated, and the indicator lamps ₂₃₁ to ₂₃₈ corresponding to the fire detector ₁₁ to ₁₈ are lit to indicate the occurrence and location of the fire. Simultaneously with the display, an acoustic notification unit 24 such as a buzzer is activated.

As mentioned above, the present invention includes a latch circuit that latches each of a plurality of input signals, a readout circuit that sequentially reads out the output of each latch circuit when any of the input signals is obtained, and It consists of a transmitter that sequentially transmits mutually distinguishable input detection signals whose carrier waves are modulated with a unique code signal corresponding to the input signal, and even when multiple input signals are input at the same time, There is an advantage that mutually distinguishable input detection signals corresponding to each input signal can be transmitted using the same carrier wave without interference.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the schematic configuration of a conventional example;
3 and 3 are explanatory diagrams of the same operation as above, FIGS. 4 and 5 are main circuit diagrams of an embodiment of the present invention, FIGS. 6 to 8 are explanatory diagrams of the same operation, and FIG. 9 is a reception diagram. FIG. 2 is a block circuit diagram of a display device. 2 ₁ to 2 ₈ are latch circuits, 3 is a readout circuit, and 9 is a transmitter.

Claims (1)

[Scope of utility model registration request] a latch circuit that latches each of the plurality of input signals; a readout circuit that sequentially reads out the output of each latch circuit when any of the input signals is obtained;
A wireless oscillator comprising a transmitter that sequentially transmits mutually distinguishable input detection signals whose carrier waves are modulated with a unique code signal corresponding to an input signal read out from a latch circuit.