CN201928254U - Automatic wire holder for serial-port link-line decoding-type managed household electronic and electric appliance - Google Patents

Abstract

The utility model relates to an automatic wire holder for serial-port link-line decoding-type managed household electronic and electric appliances, belonging to an interface device for a computer and household electric appliances. The automatic wire holder uses the computer as a main machine, is matched with four switching value output sensors, can automatically detect relevant conditions and can automatically run three pairs of electronic and electric appliances. The automatic wire holder comprises an RS232C interface, a universal serial bus (USB) interface, a USB-to-serial-port conversion circuit, four pairs of sensor interface terminals, a decoding, pulse width discrimination and output signal latch circuit, three groups of electronic switching circuits, a regulated power supply circuit and a lightning and surge protection circuit, wherein the pin CD, the pin DSR, the pin CTS and the pin RI of the RS232C interface and the cathode of a power supply respectively form the four pairs of sensor interface terminals through four pull-up resistors, and the pin DTR and the pin RTS of the serial port control the three groups of electronic switching circuits through voltage stabilizing diodes which are used for limiting voltage and the decoding, pulse width discrimination and output signal latch circuit. By using two groups of computer-managed-to-common power supply socket circuits, the device can be used for directly controlling the operation of the household electronic and electric appliances through sensors or can be used as a common power supply wire holder.

Description

Serial port connection line decoding type management of household electronic appliances automation terminal block

technical field

The utility model belongs to the technical field of applied electronics, in particular to an interface device between a computer and household electronics and electric appliances for realizing the automation of household appliances.

Background technique

The utility model patent "automated terminal block for household electronics and appliances that can be managed by computer" that is to be submitted to the Patent Office of the State Intellectual Property Office for review recently analyzes the current domestic market for products and technologies that realize the automatic operation of household electronics and appliances, and the proposed utility model With a personal computer as the host, it can cooperate with 4 switch output sensors, automatically detect the corresponding conditions of the external environment according to the preset plan, automatically run two pairs of household electronics or two pairs of electrical appliances, and can also independently cooperate with switch output sensors Control the operation of home appliances, or use it as an ordinary power socket. This utility model uses commercial power as its working power supply, and its alternating current electronic switch circuit and weak current electronic switch circuit can be expanded through parallel connection. However, since the handshake connection line of the RS232C interface that controls the operation of electronic appliances is only RTS and DTR, Therefore, the use of multiple electrical appliances brought about by this parallel expansion is still in parallel mode, and the operation cannot be controlled independently.

Utility model content

The purpose of this utility model is to provide a serial port connection line decoding type management of household electronic appliance automatic terminal block, which can cooperate with 4 switch output type sensors, with a computer as the host, to automatically detect the corresponding conditions of the external environment, Automatically run 3 pairs of household electronics or electrical appliances; can also be used independently; including: 9-pin RS232C interface, USB interface, USB to serial port circuit, 4 pairs of sensor interface terminals, decoding, pulse width identification and output signal latch circuit , 3 sets of electronic switching circuits, regulated power supply circuits, lightning protection and surge circuits, 2 sets of computer management to ordinary power socket circuits, and mains power cords and their plugs.

The technical scheme that the utility model solves its technical problem adopts is:

The USB interface is connected to the corresponding signal input terminal of the USB-to-serial port circuit, and the signal output terminal of the latter is connected in parallel with the corresponding port line of the RS232C interface; the first pin CD of the RS232C interface, the sixth pin DSR, the eighth pin CTS and The ninth pin R1 is respectively connected to a pull-up resistor to the positive pole of the power supply. These four pins and the negative pole of the power supply respectively constitute 4 pairs of sensor interface terminals; the fourth pin DTR and the seventh pin RTS of the RS232C interface are respectively connected to the Decoding, pulse width identification and output signal Two signal input terminals of the latch circuit, these two signal input terminals are also connected to a pull-down resistor and the negative pole of a Zener diode, the other end of the pull-down resistor is connected to the voltage regulator The anodes of the diodes are all connected to the negative pole of the power supply; three of the output terminals of the decoding, pulse width discrimination and output signal latch circuits are respectively connected to the control signal input terminals of the three sets of electronic switch circuits; the AC input terminals of the regulated power supply circuit It is connected in parallel with the lightning protection and surge circuit, connected to the mains through the mains power cord and its plug, and the negative pole of the regulated power supply circuit is connected to the fifth pin GND of the RS232C interface.

The stabilized power supply circuit is composed of a power transformer, a diode bridge rectifier circuit, a capacitor filter circuit and a three-terminal stabilized voltage integrated circuit 7806, and the two output terminals of the 7806 respectively constitute the positive pole and the negative pole of the power supply of the device.

The lightning strike and surge protection circuit is composed of a fuse and a varistor connected in series.

The three groups of electronic switch circuits have the same structure, and each includes: 1 AC electronic switch circuit and 1 weak current electronic switch circuit.

The alternating current electronic switch circuit includes: 1 NPN transistor, 1 PNP transistor, 1 base resistor, 1 base bias resistor, 1 collector resistor, 1 current limiting collector resistor and a solid state relay; Among them, one end of the base resistor is connected to the base of the NPN transistor, and the other end is used as the control signal input end of the electronic switch circuit. The base bias resistor is connected in parallel to the emitter junction of the PNP transistor, and the emitter of the PNP transistor is connected to the positive pole of the power supply. , the base of which is connected in series with a collector resistor to the collector of the NPN transistor, the emitter of the NPN transistor is connected to the negative pole of the power supply, and the collector of the PNP transistor is connected in series with a current-limiting collector resistor to the control signal input of the solid-state relay. The positive pole and the negative pole of the control signal input terminal of the solid state relay are connected to the negative pole of the power supply; the two output terminals of the solid state relay constitute the output terminal of the alternating current electronic switch circuit.

The weak current electronic switch circuit includes: a triode and its base resistor, a diode, a light-emitting diode and a DC relay; wherein, one end of the base resistor is connected to the base of the triode, and the other end is used as the electronic switch circuit The control signal input terminal of the triode, the emitter of the triode is connected to the negative pole of the power supply, the collector is connected to the negative pole of the light-emitting diode, the positive pole of the light-emitting diode is respectively connected to the positive pole of the diode and one end of the coil of the DC relay, and the negative pole of the diode is connected to the negative pole of the DC relay. The other end of the coil is connected to the positive pole of the power supply; the six terminals of the two pairs of single-pole double-throw switches of the DC relay constitute the output end of the weak current electronic switch circuit.

The two groups of computer management circuits have the same structure, each including a current-limiting isolation resistor, a switch and an isolation diode; wherein, one end of the current-limiting isolation resistor is connected to one end of the switch, and the other end is connected to To the positive pole of the power supply, the other end of the switch is connected to the positive pole of the diode, and a pair of binding posts are drawn from both ends of the switch to form the sensor terminal for independent use; the negative poles of the diodes in the two series circuits are respectively connected to the decoding , 2 signal input ends of pulse width discrimination and output signal latch circuit.

连接到相应的D触发器的时钟信号输入端，而D触发器的反相输出端 

作为本电路的输出信号；译码器的使能端及其接地端、三块单稳态电路的上升沿触发信号输入端及其接地端、三块D触发器的复位端都连接到电源负极，它们的电源端与三块单稳态触发器的复位端都连接到电源正极。The decoding, pulse width discrimination and output signal latching circuits include: a decoder integrated circuit, three monostable flip-flop circuits, three D flip-flops and power-on reset 1 circuits; wherein, power-on reset 1 The circuit is a series circuit composed of the positive pole of the power supply, an electrolytic capacitor, a resistor, and the negative pole of the power supply, and the wires are drawn from the connection point between the negative pole of the electrolytic capacitor and the resistor to connect to the 1 terminal of the three D flip-flops; each The monostable flip-flop circuit is composed of a monostable flip-flop and its timing resistor and timing capacitor. A monostable flip-flop circuit and a D flip-flop form a pulse width discrimination and output signal latch circuit; The two input signal terminals constitute the two signal input terminals of this circuit, and three of the decoding output terminals are respectively connected to the falling edge trigger signal in the monostable flip-flop in the one-way pulse width discrimination and output signal latch circuit The input terminal and the D input terminal in the D flip-flop; the inverting output terminal of the monostable flip-flop in each pulse width discrimination and output signal latch circuit

Connect to the clock signal input of the corresponding D flip-flop, while the inverting output of the D flip-flop

As the output signal of this circuit; the enabling terminal of the decoder and its grounding terminal, the rising edge trigger signal input terminal of the three monostable circuits and its grounding terminal, and the reset terminals of the three D flip-flops are all connected to the negative pole of the power supply , their power terminals and the reset terminals of the three monostable flip-flops are all connected to the positive pole of the power supply.

The utility model constitutes the interface between the computer and the household electronic appliances. Under the management of the computer software, it can work with many kinds of commercially available sensors, including: the output signal is switch type, +3V～+15V level type or pulse Signal type or resistance jump type sensors are beneficial to detect and automatically operate connected household electronics or household appliances, and the combination of sensors and household appliances is suitable for various occasions; its advantages are: it adopts decoding, pulse width identification and The output signal latch circuit enables the computer to control three groups of electronic switch circuits respectively through two serial port output connection lines. At the same time, the utility model can also cooperate with the sensor to directly control the operation of electronic appliances, or it can be used as a general power supply independently The use of sockets is safe and convenient.

Description of drawings

Below in conjunction with accompanying drawing, further illustrate the utility model.

Fig. 1 is the schematic circuit diagram of the utility model.

Figure 2 is a schematic diagram of decoding, pulse width discrimination and output signal latch circuit.

Figure 3 is a schematic diagram of a group of electronic switching circuits.

In the figure, 1. Decoding, pulse width identification and output signal latch circuit, 2.-4. Electronic switch circuit, 5. Regulated power supply circuit, 51. Lightning strike and surge protection circuit, 6. USB interface, 7 .USB to serial port circuit, 8. RS232C interface, 11. Decoder, 12.-14. Monostable trigger circuit, 15.-17. D flip-flop, 31. Single-pole double-throw DC electromagnetic relay, 32 . Solid state relay SSR.

Detailed ways

As shown in Figure 1, the utility model comprises the following main parts: 4 sensors represented by Rs1, Rs2, Rs3, Rs4; decoding, pulse width discrimination and output signal latch circuit (1) and its RS232C→CMOS interface protection Circuit: working status indicator LED1 and Zener diode DZ1, working status indicator LED2 and Zener diode DZ2 connected in series to the negative pole of the power supply; electronic switch circuits (2), (3) and (4); 2 groups of computer management switches Ordinary power outlet circuit: R5, S1, D1, R7 and R6, S2, D2, R8; +9V regulated power supply circuit (5) and lightning protection and surge protection circuit (51); USB interface (6), USB transfer Serial port circuit (7) and RS232C interface (8).

The transmission distance of the RS232C interface of the computer can reach 15 meters, and the transmission rate can reach 19200baud. Logic 0 corresponds to a level of +3V～+15V, and logic 1 corresponds to a level of -3V～(-15)V. Therefore, as shown in Figure 1, the interface circuit of the sensor is formed by using the pull-up resistors R1, R2, R3, R4 and Rs1, Rs2, Rs3, Rs4 to be grounded, which is suitable for the operation of many types of sensors, including: the output signal is switch type , +3V ~ +15V level or pulse signal or resistance jump sensor.

The signal output by the sensor sensing event is detected through the event property of the serial communication control MSComm32.OCX:

1 ComEvSend: The number of characters in the transmission register is less than Sthreshold;

2 ComEvReceive: Sthreshold characters are received, and the event continues to be generated until it is removed from the receiving register with the Input attribute;

3 ComEvCTS: The state of the Clear_to_Send line changes;

4 ComEvDSR: The state of the Data_Set_Ready line changes from 1 to 0;

5 ComEvCD: The status of the Carrier_Detect line changes;

6 ComEvRing: A ringing signal is detected, but it does not have the attributes MSComm32.CTSholding/.DSRholding/.DCDholding of the serial port communication control, and cannot query and detect its level. Some UARTs (asynchronous receiver-transmitters) may not support this event;

7 ComEvEOF: End of data (ASCII is 26) characters received.

In general, the working power supply of household sensors is <15V DC power supply and works indoors. Therefore, Figure 1 does not consider arranging photoelectric coupling circuits between sensors Rs1, Rs2, Rs3, Rs4 and RS232C interface for electrical isolation, which reduces the cost.

But, in order to prevent the damage of lightning strike or surge current, the input terminal of commercial power is connected with lightning strike and surge circuit (51) in parallel; Wherein, the method for estimating the varistor voltage of varistor is: V1mA=1.5V _P = 1.5 × 220V = 476V, V1mA = 2.2VAC = 2.2 × 220V = 484V, so the breakdown voltage of the varistor is selected as 470-480V, and its flow capacity is selected as 2-20KA; the specification of the fuse depends on the electronic switch circuit ( 2) The sum of the rated operating currents of the solid state relays SSR (32) (see Figure 3) used in (4) is determined.

For example, the input control voltage of JGX-10F solid state relay produced by Beijing Ketong Electronic Relay General Factory is DC3.2～14V, the typical value of input current is 5～20mA (VDC=5V), and its rated output voltage is AC25～250V , the rated output current is 10A, which is enough to drive a 1HP air conditioner.

In Fig. 1, the handshake connection lines RTS and DTR of the RS232C interface are the output signals of the computer, and the pin voltages are respectively controlled by the attributes DTREnable and RTSEnable in the serial communication control MSComm32.OCX, and the data forms of the attributes are all Boolean values ( Boolean), with True representing high potential and False representing low potential, suitable for controlling the operation of electronic appliances. Light-emitting diodes LED1 and LED2 are used to indicate the working status of RTS and DTR, and are also used to isolate the serial port of the computer from the electronic switch circuit (2)-(4), so as to avoid possible large feedback pulses from external circuits from damaging the computer. The voltage sent by the RTS and DTR pins is tested to be between ±9V~±12V, and the sent current is between 4mA~20mA. There is no current limiting resistor and the LED will not be burned. The forward voltage drop of the light-emitting diode is about 1.3V~2.4V. If the voltage sent by the RTS and DTR pins is higher than Vz~+5V after passing through LED2 or LED1, the voltage will be stabilized by the voltage regulator diode DZ2 or DZ1. Ensure the normal operation of the subsequent CMOS circuit.

The decoder (11) in the decoding, pulse width discrimination and output signal latch circuit (1) shown in Fig. 1 can adopt 2-4 decoder 74HC139 or 3-8 decoder 74HC138. The binary combination of RTS and DTR forms four states, set its normal state 00 as idle, and the remaining three states 01, 10, 11 are instructions for running electrical appliances, which are used to control the operation of three-way electrical appliances. However, two instructions are required from 00→11 to respectively specify the attributes DTREnable and RTSEnable in the serial communication control MSComm32. Although it is at the microsecond level, it will indeed affect the electronics or electrical work of one of the other two electrical appliances. Therefore, strictly speaking, the output of the decoder should not be used directly to control the operation of electrical appliances. In addition, the electronic switch circuits (2)-(4) connected behind should be able to start or stop working independently. For this reason, for the decoder (11) designed supporting three-way independent " monostable trigger+D flip-flop " circuit namely pulse width discrimination and output signal latch circuit: each road can complete the discrimination signal pulse width , Latch the instruction to run the electric appliance, and change the task of the instruction to run the electric appliance. The specific decoding, pulse width identification and output signal latching circuit (1) is shown in Figure 2.

几秒钟以后，C0，R0串联电路在上电时所引入的高电平变成了低电平，三个 D触发器(15)、(16)和(17)的置1端无效。串行口的初始状态是：DTR＝LOW，RTS＝LOW，译码器(11)的输出常态为 

In Fig. 2, C0, R0 series circuit introduces a high level when power-on so that the 1 terminals of three D flip-flops (15), (16) and (17) are effective, and its Q1Q2Q3=111, decoding, pulse The output signal of wide discrimination and output signal latch circuit (1)

After several seconds, C0, the high level that R0 series circuit introduces when power-on becomes low level, and the 1 end of three D flip-flops (15), (16) and (17) is invalid. The initial state of serial port is: DTR=LOW, RTS=LOW, the output normal state of decoder (11) is

我们分四步来实现这一目标。assume need

We achieve this in four steps.

上发生了上跳变脉冲，我们不关心它，而 上发生了不希望出现的下跳变脉冲，对于单稳态触发器(12)的触发信号输入端TR-有效，单稳态触发器(12)开始产生一个单稳态脉冲，其反相输出端 

由高跳变为低电平，但对D触发器(15)的时钟脉冲信号输入端CLK无效。不过，经过一个单稳态触发器(12)的延时时间常数τ＝(Rx×Cx)/2以后，其反相输出端 

会由低跳变为高电平，该上跳变脉冲对D触发器(15)的时钟脉冲信号输入端CLK有效，这时，有：The first step, the computer serial port line outputs DTR=HIGH earlier, after decoder (11) decoding, there is

An up transition pulse occurs on the , we don't care about it while An undesirable lower jump pulse has occurred on the top, and the trigger signal input terminal TR- of the monostable trigger (12) is effective, and the monostable trigger (12) begins to generate a monostable pulse, and its inverted output end

It changes from high jump to low level, but it is invalid to the clock pulse signal input terminal CLK of D flip-flop (15). However, after the delay time constant τ=(Rx×Cx)/2 of a monostable flip-flop (12), its inverting output terminal

Can change from low jump to high level, and this upper jump pulse is effective to the clock pulse signal input terminal CLK of D flip-flop (15), at this moment, have:

一直保持不变，则D触发器(15)的输出变成 启动了后面连接的电子开关电路(2)；(a) if

remains unchanged, the output of the D flip-flop (15) becomes The electronic switch circuit (2) connected behind is started;

已经回位到无效的高电平状态： 

则D触发器(15)的输出变成 

停止了后面连接的电子开关电路(2)的工作。(b) if

has been reset to an inactive high state:

Then the output of D flip-flop (15) becomes

The work of the electronic switch circuit (2) connected behind is stopped.

Obviously, one of the above-mentioned two situations should be selected according to the current working state of the electronic switch circuit (2) connected behind. The delay time constant τ=(Rx*Cx)/2 of the steady-state trigger (12) is matched.

上发生了上跳变脉冲，但是它对后面的单稳态触发器(12)的时钟脉冲信号输入端无效，而 

上发生了下跳变脉冲，出现了希望出现的状态，该下跳变脉冲使得单稳态触发器(14)发生动作，其反相输出端 

由高变低电平，但它对其后接的D触发器(17)的时钟脉冲信号输入端无效。经过一个单稳态触发器(14)的延时时间常数τ＝(Rx×Cx)/2以后，其反相输出端 

会由低跳变为高电平，该上跳变脉冲对D触发器(17)的时钟脉冲信号输入端CLK有效，这时，有：In the second step, the computer serial port line then outputs RTS=HIGH, after decoder (11) decoding, there is

The upper jump pulse has occurred on the upper, but it is invalid to the clock pulse signal input end of the monostable flip-flop (12) behind, and

A lower jump pulse has occurred on the top, and the desired state has occurred. This lower jump pulse makes the monostable flip-flop (14) take action, and its inverting output terminal

From high to low level, but it is invalid to the clock pulse signal input end of the D flip-flop (17) connected afterwards. After the delay time constant τ=(Rx×Cx)/2 of a monostable trigger (14), its inverting output terminal

Can change from low jump to high level, and this upper jump pulse is effective to the clock pulse signal input terminal CLK of D flip-flop (17), at this moment, have:

一直保持不变，则D触发器(17)的输出变成 

启动后 面连接的电子开关电路(4)；(c) if

remains unchanged, the output of the D flip-flop (17) becomes

Start the electronic switch circuit (4) connected behind;

已经回位到无效的高电平状态： 

则D触发器(17)的输出变成 

停止后面连接的电子开关电路(4)的工作。(d) if

has been reset to an inactive high state:

Then the output of D flip-flop (17) becomes

Stop the work of the electronic switch circuit (4) connected behind.

Obviously, in order to start the work of the electronic switch circuit (4) that connects behind, should make the time length of computer serial line output RTS=HIGH be longer than the delay time constant τ=(Rx*Cx)/2 of monostable flip-flop (14) .

上发生了上跳变脉冲，对其后面连接的单稳态触发器(14)无效，而 

上发生了不应当出现的下跳变脉冲，对于单稳态触发器(12)的触发信号输入端TR-有效，这一情况与第一步出现的相同。The 3rd step, computer serial port line output RTS=LOW, after decoder (11) decoding, there is

The upper jump pulse has occurred on the upper, and the monostable flip-flop (14) connected behind it is invalid, and

The lower jump pulse that should not occur occurs on the upper side, which is valid for the trigger signal input terminal TR- of the monostable flip-flop (12), and this situation is the same as that of the first step.

恢复到了原状态，这时， 

上发生了上跳变脉冲，但它对后面连接的单稳态触发器(12)无效， 

发生了下跳变脉冲，不用考虑。The 4th step, computer serial port line output DTR=LOW, after decoder (11) decoding, there is

returned to its original state, at this time,

The upper jump pulse occurs on the , but it has no effect on the monostable flip-flop (12) connected behind,

A lower jump pulse has occurred and is ignored.

In short, in order to accurately set /Q3=1, it is necessary to set a register for memorizing the working states of the three electronic switches (2)-(4).

或 即启动或关闭电子开关电路(2)或(3)，这两种情况简单些，其实已经包括在上述分析过程中。启动电子开关电路对应(a)或(c)情形：设置对应的译码器的输出端输出相应结果的时间要略长于单稳态触发器的延时时间常数τ＝(Rx×Cx)/2，而关闭电子开关电路对应(b)或(d)情形：设置对应的译码器的输出端输出相应结果的时间要短于单稳态触发器的延时时间常数τ＝(Rx×Cx)/2。for needs

or That is to start or close the electronic switch circuit (2) or (3), these two cases are simpler, and have actually been included in the above analysis process. Start the electronic switch circuit corresponding to (a) or (c) situation: the time for setting the output terminal of the corresponding decoder to output the corresponding result will be slightly longer than the delay time constant τ=(Rx*Cx)/2 of the monostable trigger, And closing the electronic switch circuit corresponds to (b) or (d) situation: the time for setting the output terminal of the corresponding decoder to output the corresponding result will be shorter than the delay time constant τ=(Rx*Cx)/ 2.

The USB-to-serial port circuit (7) in Figure 1 can be completed by using the "USB to serial port chip, USB to IrDA infrared, USB to printer port" chip CH340 from Nanjing Qinheng Electronics Co., Ltd., in case some do not configure RS232C interface for laptop use.

During use, one end of the utility model is connected to the USB or RS232C interface of the computer through a cable, and the other end is inserted into the mains socket through the power cord, and the electrical appliance is inserted into the corresponding socket like the power wiring board used at home, and the 4 pairs of sensors are connected through terminal to connect. People who are not familiar with sensors can temporarily ignore them, and run computer programs to manage the operation of electronics or electrical appliances.

If the serial port of the computer is not used, or the computer is not connected, the utility model can be used as a common power socket through the switches in 2 groups of "computer management to common power socket circuit"; or, from the circuit A pair of binding posts drawn from both ends of the switch, connected to some kind of switch output type sensor, or connected to the ground level output type sensor, can constitute a household electronic or electrical terminal block that the sensor directly controls the operation of.

Claims (8)

1. The automatic terminal block for household electronic appliances with serial port connection line decoding type management, which is characterized by: 9-pin RS232C interface, USB interface, USB to serial port circuit, 4 pairs of sensor interface terminals, decoding, Pulse width identification and output signal latch circuit, 3 sets of electronic switch circuits, regulated power supply circuit, lightning strike and surge protection circuit, 2 sets of computer management to ordinary power socket circuit, mains power cord and its plug; among them, USB The interface is connected to the corresponding signal input terminal of the USB-to-serial port circuit, and the signal output terminal of the latter is connected in parallel with the corresponding port line of the RS232C interface; the first pin CD, the sixth pin DSR, the eighth pin CTS and the first pin CTS of the RS232C interface Nine pins RI are respectively connected to a pull-up resistor to the positive pole of the power supply. These four pins and the negative pole of the power supply respectively constitute 4 pairs of sensor interface terminals; the fourth pin DTR and the seventh pin RTS of the RS232C interface are respectively connected to the translator through a light-emitting diode. Code, pulse width identification and output signal latch circuit of the two signal input terminals, these two signal input terminals are connected to a pull-down resistor and a negative voltage Zener diode, the other end of the pull-down resistor and Zener diode The positive poles of all are connected to the negative pole of the power supply; three of the output terminals of the decoding, pulse width discrimination and output signal latch circuits are respectively connected to the control signal input terminals of the three sets of electronic switch circuits; the AC input terminals of the regulated power supply circuit are connected to the The lightning protection and surge circuits are connected in parallel, connected to the mains through the mains power cord and its plug, and the negative pole of the regulated power supply circuit is connected to the fifth pin GND of the RS232C interface. 2. the household electrical appliance automation terminal block of the serial port connection line decoding type management according to claim 1, it is characterized in that, described stabilized power supply circuit is made up of power transformer, diode bridge rectifier circuit, capacitance filter circuit and Composed of a three-terminal voltage stabilizing integrated circuit, the two output terminals of the three-terminal voltage stabilizing integrated circuit respectively constitute the positive pole and negative pole of the power supply of the device. 3. The automatic terminal block of household electronic appliances according to claim 1, characterized in that, the lightning protection and surge circuit is composed of a fuse and a varistor string Even composition. 4. The automatic terminal block for household electronic appliances managed by serial port connection line decoding type according to claim 1, characterized in that, the structures of the 3 groups of electronic switch circuits are the same, each comprising: 1-way AC electronic switch circuit And 1 weak current electronic switch circuit. 5. The household electrical appliance automation terminal block of serial port connection line decoding type management according to claim 1, it is characterized in that, the structure of described 2 groups of computer management turns common power outlet circuit is identical, comprises 1 limiter respectively One end of the current-limiting isolation resistor is connected to one end of the switch, the other end is connected to the positive pole of the power supply, the other end of the switch is connected to the positive pole of the diode, and is drawn from both ends of the switch A pair of binding posts constitutes the sensor terminal for independent use; the cathodes of the diodes in the two series circuits are respectively connected to the two signal input terminals of the decoding, pulse width discrimination and output signal latch circuits. 6. The automatic terminal block for household electronic appliances with decoding type management of serial port connection line according to claim 1, characterized in that, the decoding, pulse width discrimination and output signal latch circuit comprises: a decoder Integrated circuit, three monostable flip-flop circuits, three D flip-flops and their power-on-set 1 circuit; among them, the power-on-set 1 circuit is composed of the positive pole of the power supply, an electrolytic capacitor, a resistor and the negative pole of the power supply A series circuit, and lead wires from the junction point of the negative pole of the electrolytic capacitor and the resistor to connect to the 1-set terminals of three D flip-flops; each monostable flip-flop circuit is composed of a monostable flip-flop and its timing resistor and timing capacitor Composition, a monostable flip-flop circuit and a D flip-flop form a pulse width discrimination and output signal latch circuit; two input signal terminals of the decoder constitute two signal input terminals of this circuit, and its decoding output terminal Three of them are respectively connected to the falling edge trigger signal input terminal in the monostable flip-flop in the one-way pulse width discrimination and output signal latch circuit and the D input terminal in the D flip-flop; each pulse width discrimination and output signal The inverting output of the monostable flip-flop in the latch circuit

Connect to the clock signal input of the corresponding D flip-flop, while the inverting output of the D flip-flop

As the output signal of this circuit; the enabling terminal of the decoder and its grounding terminal, the rising edge trigger signal input terminal of the three monostable circuits and its grounding terminal, and the reset terminals of the three D flip-flops are all connected to the negative pole of the power supply , their power terminals and the reset terminals of the three monostable flip-flops are all connected to the positive pole of the power supply. 7. The automatic terminal block for household electronic appliances managed by serial port connection line decoding type according to claim 4, characterized in that, the AC electronic switch circuit includes: 1 NPN triode, 1 PNP triode, 1 Base resistor, 1 base bias resistor, 1 collector resistor, 1 collector resistor for current limiting and a solid state relay; wherein, one end of the base resistor is connected to the base of the NPN transistor, and the other end is used as the electronic switch The control signal input terminal of the circuit, the base bias resistor is connected in parallel to the emitter junction of the PNP transistor, the emitter of the PNP transistor is connected to the positive pole of the power supply, and its base is connected in series with a collector resistor to the collector of the NPN transistor. The emitter is connected to the negative pole of the power supply, and the collector of the PNP transistor is connected in series with a current-limiting collector resistor to the positive pole of the control signal input terminal of the solid-state relay, and the negative pole of the control signal input terminal of the solid-state relay is connected to the negative pole of the power supply; the solid-state relay The two output terminals form the output terminals of the alternating current electronic switching circuit. 8. The automatic terminal block for household electronic appliances managed by serial port connection line decoding type according to claim 4, characterized in that, the weak current electronic switch circuit comprises: a triode and its base resistance, a diode , a light-emitting diode and a DC relay; wherein, one end of the base resistor is connected to the base of the triode, and the other end is used as the control signal input end of the electronic switch circuit, the emitter of the triode is connected to the negative pole of the power supply, and the collector is connected to the The negative pole of the light-emitting diode and the positive pole of the light-emitting diode are respectively connected to the positive pole of the diode and one end of the coil of the DC relay, and the negative pole of the diode and the other end of the coil of the DC relay are connected to the positive pole of the power supply; the two pairs of single-pole double-throw switches of the DC relay The six terminals constitute the output terminals of the weak current electronic switch circuit. the

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