KR20020037737A - Two way communication system with only two lines - Google Patents

Abstract

PURPOSE: A 2-wire bidirectional communication system is provided to connect between a main control device and a terminal by only two wires of DC power supply wires, supply a DC power from the main control device to the terminal using the 2 wires, and perform a bidirectional communication. CONSTITUTION: A main control device(1) comprises an input voltage conversion and bridge rectifying circuit unit(15) for supplying a DC power necessary for driving a system, positive(+) and negative(-) terminals for supplying the DC power to a terminal(2), and a CPU(14) for transmitting and receiving data with the terminal(2), combining the result, and controlling the elements and devices of the main control device(1). The main control device(1) includes a loaded line impedance(Z11) for connecting to the input voltage conversion and bridge rectifying circuit unit(15) and the positive(+) terminal, providing a current path to the terminal(2), and overlapping a transmitting and receiving data waveform to a power supply line, and a data pulse driver(11) for connecting to the loaded line impedance(Z11) and a transmission data output terminal(Tx1) of the CPU(14) and overlapping the transmission data waveform to the power supply line. The main control device(1) has a data extractor(12) connecting to the loaded line impedance(Z11) and a receipt data input terminal(Rx1) of the CPU(14), extracting data from the data waveform overlapped to the power supply line, and supplying the extracted data to the receipt data input terminal(Rx1) of the CPU(14), and a driving power circuit unit(13) for supplying the power to each unit of the main control device(1). The main control device(1) and the terminal(2) transmit and receive the power by only two wires(+)(-) of the DC power supply wires and perform a bidirectional communication.

Description

Two way communication system with only two lines}

The present invention relates to a "two-wire two-way communication system" terminal used in connection with a main control device such as a boiler [Example; By using only two wires of DC power supply line between each controller installed in each room, the main control device and the terminal can be bidirectionally communicated with each other to facilitate the indoor and outdoor wiring work for connecting the main control device and the terminal. To improve the convenience of the consequently to provide an effect of increasing the price competitiveness of the product that requires two-way communication. In the conventional bidirectional communication system configured as shown in FIG. It is difficult to wire indoors and outdoors, and there are 4 terminals corresponding to both the control device and the controller. Therefore, it is difficult to connect because each wire and terminal have to be connected separately. There was also a problem that the control microcomputer is destroyed.

Therefore, the object of the present invention devised to solve such a problem is to connect only two lines of the DC power supply line between the main control device and the terminal requiring two-way communication and use these two lines to direct the DC from the main control device side to the terminal side. The present invention provides a two-wire two-way communication system that supplies power and enables two-way communication at the same time.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing an example of a circuit configuration for a system that performs bidirectional communication in a conventional manner.

Figure 2 is a circuit diagram of an embodiment of the "two-wire two-way communication system" according to the present invention

Fig. 3 is a data waveform diagram showing each part when a main control device and a terminal [attached controller] perform two-way communication in a preferred embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

One ; Circuit block of main controller

2 ; Circuit block of the first terminal

3; Circuit block of the second terminal

11; Transmit data pulse driver of main controller

12; Receive Data Ejector of Main Control

13; Driving power circuit part of main control device

14; Central control unit of main control unit

15; Input voltage conversion and bridge rectifier circuit

21; Transmit data pulse driver of terminal [loaded controller]

22; Receive Data Ejector in Terminal [Attached Controller]

23; Driving power circuit part of terminal [attached controller]

24; Central control of the terminal [controlled controller]

T ₁₁ ; Down transformer of main control

F; Hughes

D _{11 to} D ₁₅ ; First to fifth diodes of the main controller

C ₁₁ , C ₁₂ ; First and second condenser of the main controller

Z ₁₁ ; Loaded Line Impedance of Main Controls

R ₁₁ to R ₁₅ ; First to fifth resistors of the main control unit

Q _{11 to} Q ₁₃ ; First to third transistors of the main controller

U ₁₁ ; Control microcomputer of main controller

U ₁₂ ; Regulator of main control

Rx ₁ ; Receive data input terminal of control microcomputer of main controller

Tx ₁ ; Transmission data output terminal of control microcomputer of main controller

O ₁ ; Control output terminal of the control microcomputer of the main control unit

D ₂₁ , D ₂₂ ; First and second diodes of the terminal [attached controller]

C ₂₁ , C ₂₂ ; First and second capacitors of the terminal [attached controller]

R ₂₁ to R ₂₅ ; First to fifth resistors of terminals [attached controller]

Q _{21 to} Q ₂₃ ; First to third transistors of the terminal [attached controller]

U ₂₁ ; Microcontroller of terminal [loaded controller]

U ₂₂ ; Regulator of terminal [loaded controller]

Rx ₂ ; Receive data input terminal of control microcomputer of terminal [loaded controller]

Tx ₂ ; Transmission data output terminal of control microcomputer of terminal [loaded controller]

I ₂ ; Key input terminal of terminal [attached controller]

SW ₁ ; Input key switch of terminal [attached controller]

A characteristic of the "two-wire two-way communication system" according to the present invention for achieving the above object is to supply the DC power through the weighted line load from the main control device side to the terminal side while supplying a pulse current corresponding to the data to the weighted line load. Transmitting data to the terminal side in a flowing manner, and extracting data contained in two wires supplied with DC power from the main controller at the terminal side, and using two DC power supply lines from the terminal side. Transmitting data to the control device side and extracting data from the terminal side at the main control device side. DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the "two-wire bidirectional communication system" according to the present invention will now be described in detail with reference to the accompanying drawings. 1 is a diagram showing an example of a circuit configuration of a system for bidirectional communication in a conventional manner, wherein two DC power supply lines [(+), (-)] and two data communication lines [Rx, Tx], 4 lines in total are required. If the power supply lines [(+), (-)] from the main control unit [1] are incorrectly connected to the communication terminals [Rx, Tx] of the terminal [2], the control microcomputer [U ₂₁ ] Is destroyed, so special attention is required for the wiring work. In the "two-wire bidirectional communication system" according to the present invention as in the embodiment of Fig. 2, since two power supply lines [(+), (-)] are used as the communication lines, the terminal (+), Incorrect wiring by swapping wires to (-) terminal. Even if the reverse current circuit is blocked by the second diode [D ₂₂ ] in the terminal, all the circuit components of the terminal [2] are safely protected. The main controller [1] receives the commercial AC input [AC 110 / 220V], reduces the voltage to the transformer [T ₁₁ ], rectifies it in the bridge rectifier circuit [D ₁₁ to D ₁₄ ], and then to the smoothing capacitor [C ₁₁ ]. Smooth and get DC power [Vcc] of about 12V _DC and make 5V constant voltage [V _DD ] with regulator [U ₁₂ ] and use it as driving power. Also, a DC power supply of about 12V [Vcc] is supplied to the terminal [loaded controller] through the weighted line load [Z ₁₁ ] of the main control device. In terminal [2], the power supplied from main controller [1] is rectified and smoothed by diode [D ₂₁ ] and condenser [C ₂₁ ], and 5V constant voltage is made by regulator [U ₂₂ ] to be used as driving power of terminal. . The flow of current for driving a terminal is

Main controller Vcc terminal-→ Z _11- → Main controller (+) terminal-→ Terminal (+) terminal-→ D _21- → C _21- → D _22- → Terminal (-) terminal- Main controller (-) terminal

Are as in the supply of the terminal power source for is because achieved through a weighted line load [Z _11] Assuming that the resistance value of the total current supplied to the plurality of terminals weighted line load [Z _11] When called 30mA to 10Ω of Z ₁₁ The voltage at both ends is 0.3V. If there is more current, lower the resistance of Z ₁₁ so that the voltage at both ends is 0.3V. If Z ₁₁ is replaced with a coil, more current can be supplied to the plurality of terminals [[2], [3], ...] while maintaining the voltage at both ends at 0.3V. At this time, if the voltage at both ends of Z ₁₁ is maintained at about 0.3V, the voltage between the emitter bases of the second transistor [Q ₁₂ ] of the main control device becomes less than the conduction voltage, so the second transistor [Q ₁₂ ] is maintained in the OFF state. do. At this time, the second transistor [Q ₂₂ ] of the terminal side also maintains the OFF state because the reverse voltage is applied between the emitter bases. Increasing the instantaneous current of the Z ₁₁ Z ₁₁ in this state, when the terminal voltage uiyang to add falls over the second transistor is 1.5V [Q _12] FIG conduction of the main control device moment on [ON], and the state of the terminal The second transistor [Q ₂₂ ] is also turned on and momentarily turned on [ON].

therefore

Typical Current of Terminal = 30mA

Z ₁₁ = 10 Ω

R ₁₂ = 20 Ω

R ₂₂ = 20 Ω

When the data pulse is generated at the transmission data output terminal [Tx ₁ ] of the control microcomputer [U ₁₁ ] of the main control device and applied to the base of [Q ₁₁ ] of the first transistor, the first transistor [Q ₁₁ ] is a data pulse type. Since the second transistor [Q ₂₂ ] of the terminal is also turned [ON] in the form of a data pulse, the third transistor [Q ₂₃ ] is also turned [ON] in the form of a data pulse so that the control microcomputer [U] of the terminal is turned ON. _The data is transferred to the received data input terminal [Rx ₂ ] of ₂₁ ]. At this time, the main control device of the second and third transistors [Q _12, Q _13] also on to the data pulse form of the main control unit receives data input terminal [Rx _1] In the data transfer, but the magnetic from the control microcomputer [U _11] Ignore the return of data. The terminal in the control microcomputer [U _21] Transmission data output terminal [Tx _1] generates a data pulse from a first Applying to the base of the transistor [Q _21] The first transistor [Q _21] is on a data pulse in the form of [ON ] And the second and third transistors [Q ₁₂ , Q ₁₃ ] of the main control device are also turned on in pulse form, and the data from the terminal is transferred to the reception data input terminal [Rx ₁ ] of the control microcom in the main control device. Even when data is sent from the control microcomputer [U ₂₁ ] of the terminal, data is also inputted to the received data input terminal [Rx ₂ ] of the terminal, but disregarding this processing is the same as that of the control microcomb [U ₁₁ ] of the main controller. . The resistors [R ₁₂ , R ₂₂ ] used for the collectors of the Tx transistors [Q ₁₁ , Q ₂₁ ] of the main controller and the terminal [sub controller] are limited to the collector current of the transistors. Transistor]. In Fig. 3, there is shown a data waveform diagram appearing in each part when bidirectional communication is performed between the main control device and the terminal [subordinate controller]. (1) Figure 3 is a main control device (1) (2) of Fig, 3 Tx data waveforms from the transmission data output terminal [Tx ₁ of the control microcomputer sends a data output of the control microprocessor of the terminal of the terminal [ Tx data waveform diagram from Tx ₂ ], FIG. 3 (3) is a waveform diagram showing the main control device and the power supply line (+) terminal of the terminal, and FIG. 3 (4) shows the second transistor [Q _22] of the terminal. ] (3) is a waveform diagram of the received data input terminal [Rx ₂ ] of the terminal control microcomputer, and (6) of FIG. 3 is a second transistor [Q] of the main control device. _12] of the FIG., 3 the data waveform shown in the collector terminal (7) is a waveform diagram shown in the received data input terminal [Rx _1] of the main control unit controls the microcomputer. As can be seen from the above, in the "two-wire bidirectional communication system" according to the present invention, the main control device includes an input voltage conversion and bridge rectification circuit section [15], a central control section [14], a power supply terminal (+) (-), and a weighted line. A load [Z ₁₁ ], a transmit data pulse driver [11], a receive data extractor [12] and a drive power supply circuit section [13] are provided. The terminal [load controller] has a power input terminal (+) (-) and a center. The control unit [24], the transmit data pulse driver [21], the receive data extractor [22] and the drive power supply circuit unit [23] are composed, and the main control unit [1] and the terminal [connected controller] [2] which require two-way communication. Because wiring of is composed by connecting only the power supply line 2 [(+), (-)] wire, the wiring is simple and prevents the parts of the [controlled controller] from being damaged even if the wiring is wrong.

As described above, in the " two-wire bidirectional communication system " according to the present invention, the control device and the terminal are operated by connecting only two lines of the power supply line (+) (-) to the main control device and the terminal [attached controller] requiring bidirectional communication. It is easy to connect indoors and outdoors, and solves the problem of damage to circuit components in the terminal due to incorrect wiring of the terminal and wiring. As a result, it provides a value increase effect of products requiring two-way communication.

Although the above has been illustrated and described with respect to the preferred embodiment of the present invention, the present invention is not limited to the above-described embodiment, it can be variously changed without departing from the gist of the invention claimed in the claims of the present invention, Such changes are intended to fall within the scope of the claims.

Claims (1)

The main controller is An input voltage conversion and bridge rectifier circuit unit for supplying a DC power source for driving the system; (+) And (-) terminals to supply DC power to the terminal [attached controller]: A central control unit [control micom] for transmitting / receiving data with the terminal and synthesizing the results and controlling the devices and devices controlled by the main control device; A weighted line load connected to the bridge rectifier circuit part and a power supply (+) terminal to provide a current path to the terminal and to superimpose a transmission / reception data waveform on a power supply line [Loaded Line Impedance]; A data pulse driver connected to the line load and a transmission data output terminal [Tx ₁ ] of a central control unit of the main control device to superimpose a transmission data waveform on the power supply line; It is connected to the line load and the reception data input terminal [Rx ₁ ] of the central control unit of the main control device to extract data from the data waveform superimposed on the power supply line and apply the data to the reception data input terminal [Rx ₁ ] of the central control unit. Data extractor; It is composed of a driving power supply circuit for supplying power to each part of the main control device, The terminal [attached controller], (+) And (-) terminals for introducing a DC power supply from the main control device; A terminal central control unit [control micom] which receives a key input from a user and transmits and receives data to and from the main control device and other necessary matters including the contents thereof; [Sub controller Data Pulse Driver] is connected to the (+) terminal for inputting the power and the [Tx ₂ ] transmission data output terminal of the terminal central control unit to superimpose the terminal transmission data waveform on the power input (+) line. ]Wow ; Connected to the power input (+) terminal and the reception data input terminal [Rx ₂ ] of the terminal central control unit to extract data from a data waveform superimposed on the power input (+) line to receive the data input terminal [Rx] of the terminal central control unit; A terminal data extractor for ₂ ]; It is composed of a driving power supply circuit for supplying power to each part of the terminal, the main control device and the terminal [attached controller] is a two-way communication by sending and receiving only two lines of the DC power supply line (+), (-) 2-wire 2-way communication system characterized by.