JPS6214971B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal transmission system that transmits power and signals between a remotely located parent device and a slave device using two wires. It is an object of the present invention to provide a signal transmission system in which an emergency power source can form a power supply circuit to a child device with a simple circuit, and the cost and size of the parent device can be reduced.

The conventional signal transmission method superimposes a signal on the commercial frequency power supply voltage, and when applied between the main unit and slave unit that make up a warning device, it is necessary to prevent the system from becoming unusable in the event of a power outage or disconnection. In most cases, the system is configured to maintain functionality by switching to an emergency power source, i.e., a DC power source such as a battery. An inverter circuit is required to convert the DC voltage output from the main unit into an AC voltage equivalent to the commercial frequency power supply voltage, and the power supply circuit from the main unit's emergency power supply to the slave unit becomes complicated, which increases the cost of the main unit. There was a problem in that as the price became higher, the size became larger.

The present invention has been made in view of this point, and will be explained in detail below with reference to Examples.

In Fig. 1, 1 is a master unit, 2 is a slave unit, and these are connected by two lines 3, and these two lines 3 supply power from the master unit 1 to the slave unit 2, and This is used as a signal transmission path between the device 1 and slave device 2. Reference numeral 4 denotes an AC power supply, and this voltage is stepped down by a transformer 5, rectified by a rectifier circuit 6, and connected to a constant voltage circuit 7. The emergency power source 8 consisting of a battery is float-charged via a diode D ₁ during non-power outages, and discharged via a diode D ₂ during power outages. The constant voltage circuit 7 is constituted by transistors Tr ₁ and Tr _2. A transistor Tr ₃ is connected between the base of the transistor Tr ₂ and ground, and a continuous wave of a constant period is applied to the base of the transistor Tr ₃ . Only when the transistor Tr ₃ is on due to this continuous wave, the constant voltage circuit 7
is activated and transmits DC voltage intermittently to slave unit 2. This intermittent wave is output from Coφ of the CPU 9. This intermittent wave is transmitted to the slave unit 2 by the timing pulse acquisition circuit 10 as shown in FIG.
The CPU 11 imports the signal and synchronizes the signal transmission between the master device 1 and the slave device 2.

The intermittent DC voltage is applied from the main unit 1 to the slave unit 2 as described above.
A signal transmitted from the parent device 1 to the child device 2 or from the child device 2 to the parent device 1 in synchronization with the DC intermittent voltage is superimposed on this DC intermittent voltage. At this time, the start signal S ₀ is superimposed on the DC intermittent voltage as shown in FIG. 4, and this is received by the slave device 2, so that the signal is sent. The DC intermittent voltages following this start signal S ₀ are sequentially defined as the first channel, the second channel, . . . the _Nth channel, and the channel signals S ₁ , S ₂ , . Signals S ₁ , S ₂ …
...The frequencies of S _N may be different or may be the same frequency. For the same frequency,
It is sufficient to predetermine signals such as ringing a bell for the first channel and lighting a lamp for the second channel. Also, the first channel is sent from slave unit 2 to master unit 1, and the second channel is sent from slave unit 2 to master unit 1. 1
It is also possible to specify that this is a channel for sending signals from the terminal to the child device 2.

In order to increase signal transmission, two different frequencies f ₁ and f ₂ can also be combined and superimposed as shown in FIG. 5 or FIG. 6. For example, as shown in Figure 6,
Divide the DC intermittent voltage into four equal parts, and set the frequencies of the signals superimposed between them as f ₁ , f ₂ , f ₁ , f ₂ , where f ₁ is 0 and f ₂
When is set to 1, the signal becomes 0101, which is a 4-bit signal. Therefore, as shown in Figure 5,
The start signal S ₀ is f ₁ , f ₂ , f ₁ , f ₂ (0101), and then f ₁ , f ₁ , f ₂ , f ₂ (0011), f ₂ , f ₂ , f ₁ , f ₁
(1100), f ₂ , f ₁ , f ₂ , f ₁ (1010), f ₁ , f ₁ , f ₁ , f ₂
It is possible to create 14 types of signals such as (0001).

This signal is obtained by the oscillation circuit 13 or 14 of the control signal generator 12 shown in FIG. Now, oscillation circuit 1
Assume that the oscillator OSC ₁ of 3 oscillates at 298kHz (f ₂ ), and the oscillator OSO ₂ oscillates at 256kHz (f ₁ ), and the CPU 9
The ₅ outputs output f ₁ and f ₂ switching signals, and the outputs of ₅ and the outputs of the oscillators OSC ₁ and OSC ₂ are connected to two NAND
Gates NAND ₁ , NAND ₂ and one NOR gate
NOR ₁ combines the output of NOR gate NOR ₁ and the output of signal sending command signal ₆ to NAND gate NAND ₃
In addition to this, the signal is input to the transmitting circuit 15, superimposed on the DC intermittent voltage by the coupling circuit 16, and sent to the child device 2. This operation is illustrated in FIG. 7.
The signal sent in this way is received by the receiving circuit 18 via the coupling circuit 17 of the slave unit 2, and the CPU
The load drive circuit 19 is operated via the load drive circuit 11 to control the load 20. At this time, the slave unit 2 is supplied with a DC voltage obtained by rectifying the intermittent DC voltage in the rectifier circuit 21 and making it constant in the constant voltage circuit 22 . When transmitting a signal from the slave device 2, the CPU 11 is operated by the output of the detection signal generator 23 such as a sensor or switch, and the control signal generator 24 generates a signal in the same way as the parent device 1, and the signal is sent to the transmitter circuit 25. The signal is input to the main unit 1, superimposed on the intermittent DC voltage by the coupling circuit 17, and transmitted to the main unit 1, received by the receiving circuit 26 of the main unit 1, and controlled by the load 28 via the load drive circuit 27. Reference numeral 29 is a detection signal generating section of the parent device.

FIG. 8 shows the specific circuits of the detection signal generation section 29 and the load drive circuit 27 of the main device 1, and the CPU 9
An unlock push button switch 30, an emergency push button switch 31, a warning reset switch 32, etc. are connected to the A port of the switch, and the transistor Tr ₄ is driven by the signal of the scan output ₇ , and each input terminal A ₀ to
It checks whether the potential of _A3 is "L" or "H". A secret number setting switch 33 is connected to the B port input of the CPU 9, and the B port is controlled by the scan output signals C ₀₁ to _{C 04} .
It is checked whether the inputs of _B0 to _B8 are "L" or "H". The output C ports Co ₈ to _{Co 11} are connected to the notification sound generation circuit 34, so that outputs with different sound qualities can be obtained, such as ping-pong for Co ₈ , poro-ron for Co ₉ , and boom for Co ₁₀ . For the output E ports, Eoφ outputs an intercom/alarm switching signal, Eo ₁ outputs an open door indicator light output, Eo ₂ outputs an unlock indicator light output, and Eo ₃ outputs a warning indicator light output.

Figure 9 shows the specific circuit of slave device 2, and the B of CPU 11.
An unlock detection switch 35 and an open door detection switch 36 are connected to the input port, and when the scan output ₇ is output, the potentials of Bi ₁ and Bi ₂ are “L” or “H”.
will be checked. A secret switch 37, a warning reset switch 38, and an unlock push button switch 39 are connected to the A input port, and the potential of the A input port is "L" when the output of the output C port is applied.
or “H”. Output D port Do
An electric lock drive circuit 40 is connected to φ, and the electric lock 4
1, and a warning indicator light lighting circuit 42 is connected to the output E port Eo ₃ . 43 is an intercom slave unit.

Now, a case where the intercom call push button of slave device 2 is pressed will be explained. A scan output ₇ is output at the timing issued by the internal program of the CPU 11, and the CPU 11 receives the information that the input port Bi is at a low level. The CPU 11 determines that this input is a calling signal, and generates a calling signal in the control signal generator 24 at the timing of the start signal and the channel from the child device 2 to the parent device 1, and sends it to the line 3 via the coupling circuit 17. Transmitted by The master device 1 takes in the signal transmitted from the coupling circuit 16, receives it in the receiving circuit 26, and sends it to the CPU 9.
Enter into SNSI input. The CPU 9 counts this input signal with a counter, determines that it is a calling signal, outputs a calling signal output Co ₈ , activates the notification sound generation circuit 34, and makes a ping-pong sound from the notification device 44. Therefore, the family member speaks to the slave device 2 side using the intercom master device 45 to confirm and closes the unlock push button switch 30. At the timing of the scan output ₇ of the CPU 9, the unlock signal is taken into A ₃ , and the CPU 9 receives this unlock signal, the unlock detection input signal already sent from the slave device 2 and stored in the RAM, and the open door detection signal. If it is necessary to unlock the door based on the input signal, an unlock command signal is sent to the child unit 2. This unlock command signal is the third
It is superimposed on the channel and sent to slave device 2. At the same time, a display signal buzzer is emitted from the annunciator 44 in the parent unit 1. On the other hand, since the intercom has been switched to the notification sound, a buzzing sound is simultaneously emitted from the speakers of the intercom handset 43 via the intercom circuits l ₁ and l ₂ . The slave unit 2 receives the unlocking command signal, determines it with the CPU 11, and outputs the unlocking signal Doφ.
is output, and the electric lock driving circuit 40 is operated to drive the electric lock 41 to unlock it. Then, the unlock detection switch 35 is activated, and the scan output of the CPU 11 captures this, and on the other hand, a signal indicating that the lock has been unlocked is sent to the master device 1 via the channel, and in response to this, the master device 1 outputs the unlocking display output Eo ₂ , and the indicator light 46 lights up. Next, when the guest opens the door on the slave unit 2 side, the open door detection switch 36 is activated, and a signal indicating that the door has been opened is sent to the B input port Bi ₁ at the timing of the scan output ₇ of the CPU 11.
The slave device 2 sends a signal to the master device 1 indicating that it is ready. The main device 1 receives this signal and determines that the door has been opened, and outputs an open door signal output Co ₉ and a switching signal output Eoφ, and both the main device 1 and the slave device 2 make a clicking sound. Then, since the door opening display output Eo ₁ is output, the door opening indicator light turns on. When the door is closed, the door indicator light goes out.

Next, we will explain what happens when a family member returns home. When the householder activates the secret switch 37 of the slave device 2 with a predetermined number in a predetermined order, the scan outputs Co ₁ , Co ₂ , Co ₃ of the CPU 11 are input to the input ports Ai ₀ ,
The signals of Ai ₁ , Ai ₂ , and Ai ₃ are taken in and sent to CPU1 in sequence.
1 RAM, and this is stored in the 2nd RAM from the CPU 11.
The input of the secret switch 37 is encoded on the channel and sent to the master unit 1 side. CPU of main unit 1
9 compares this signal with the inputs B ₀ to _{B 3} of the secret number setting switch 33 to determine whether they match. If they match, the CPU 9 sends an unlock command signal to the slave device 2 by superimposing it on the third channel, and also outputs an unlock signal output Co ₁₀ and a switching output Eoφ, and the buzzing sound is output from the master device 1 and slave device 1. Both vessels 2 come out. When a household member opens the door, the open door detection switch 36 is activated and sends a signal from the child device 2 to the parent device 1.
In response to this, the CPU 9 outputs an open door display output Eo ₁ and a switching signal output Eoφ, so that both the master unit 1 and slave unit 2 generate a popping sound. When the door is closed, the signal of the open door detection switch 36 is inverted, the open door display signal Eo ₁ disappears due to the signal sent to the main unit 1, and the open door indicator light is turned off. Therefore, when the warning reset switch 32 is turned on in the main device 1, the alarm state is returned.

As mentioned above, a very large number of signals are transmitted to the parent device 1,
Transmission is possible between slave unit 2 using a two-wire line, but this uses CPUs 9 and 11 for master unit 1 and slave unit 2, respectively, and encodes each signal and transmits it on a predetermined channel. signal to cpu
This can be done by determining and processing the numbers 9 and 10.

As described above, the present invention connects a remotely located parent unit and slave unit with two lines, and supplies DC voltage intermittently at a predetermined cycle from the parent unit equipped with an emergency power supply that is float-charged. The intermittent DC voltage is used to transmit power to the slave device, and the intermittent DC voltage is transmitted by superimposing a signal with a frequency different from the cycle of the intermittent voltage, and the intermittent DC voltage that continues after the intermittent DC voltage on which the start signal is superimposed is transmitted. A predetermined signal is superimposed on the DC voltage and transmitted, and the slave unit receives the superimposed signal in synchronization with the DC intermittent voltage, and the voltage supplied from the parent unit to the slave unit is used as an emergency power source. Since the DC voltage outputted from the DC voltage is intermittent at a predetermined period, this intermittent DC voltage can be used as a synchronization signal to transmit signals between the parent device and the slave devices. Compared to the case of transmission, the power supply circuit from the emergency power source of the parent unit to the slave units can be significantly simplified, and there is an effect that cost reduction and miniaturization can be easily achieved. In other words, if the DC voltage output from the emergency power source of the parent unit is directly supplied to the slave unit, synchronization during signal transmission will not be possible.
On the other hand, when converting the DC voltage output from the emergency power supply to AC voltage and powering the slave unit, an inverter circuit is required, which complicates the circuit configuration of the master unit, increasing costs and increasing the size. However, in the present invention, by supplying DC intermittent voltage from the parent unit to the slave unit, it is possible to synchronize and transmit signals between the master unit and the slave unit. At the same time, the power supply circuit from the emergency power source of the parent device to the child device can be formed with a simple switch circuit (the same circuit as the power supply circuit during non-power outages).
This makes it possible to reduce the cost and size of the parent device.

[Brief explanation of the drawing]

Fig. 1 is a block circuit diagram of an embodiment of the signal transmission system of the present invention, Fig. 2 is a circuit diagram of the main part of the same parent device,
Figure 3 is a circuit diagram of the main part of the same slave unit as above, Figure 4 is a waveform diagram of an example of the transmission signal as above, Figure 5 is a waveform diagram of another example of the transmission signal as above, and Figure 6 is as above. Enlarged waveform diagram, Figures 7 a to i are the same main signal waveform diagrams as above, Figure 8
The figure is a circuit diagram of a master device when the present invention is used in a warning device, and FIG. 9 is a circuit diagram of a slave device. 1...Main device, 2...Slave device, 3...Railway, 9...
CPU, 11...CPU, 12...Control signal generation section, 16...Coupling circuit, 17...Coupling circuit, 24
... Control signal generation section, 30 ... Electric lock release push button switch, 32 ... Warning reset switch, 3
4...Notification sound generation circuit, 35...Unlock detection switch, 36...Open door detection switch, 37...Secret switch, 41...Electric lock, 42...Intercom slave unit, 45...Intercom base unit , 46
...Display means.

Claims (1)

[Scope of Claims] 1 A remotely located parent device and a slave device are connected by two lines, and a direct current voltage is applied at a predetermined cycle from the parent device equipped with an emergency power source consisting of a float-charged battery. Electric power is transmitted to the slave device using an intermittent DC voltage that is intermittent at A signal transmission system characterized in that a predetermined signal is superimposed on an intermittent voltage and transmitted, and a slave device receives the superimposed signal in synchronization with the intermittent DC voltage. 2. Combining two types of signals with mutually different frequencies as signals to be superimposed on the intermittent DC voltage, dividing one section of the intermittent DC voltage into four equal parts, and superimposing the two types of frequencies between the four equal parts. 2. The signal transmission system according to claim 1, wherein the signal is transmitted as a 4-bit signal. 3. The intermittent DC voltage that continues after the start signal is the first channel, the second channel, . . . the Nth channel, and signals of different frequencies are superimposed on each channel. Signal transmission system.