KR20000018203A - Auto air-conditioning system and digital/analog communication apparatus thereof - Google Patents

Abstract

PURPOSE: An automatic air conditioner system and a digital/analog communication device are provided to automatically control a system load such as a valve, an actuator and so on installed in a building by periodically monitoring a temperature and humidity. CONSTITUTION: An automatic air conditioner system and a digital/analog communication device have: an input terminal board(400) for turning a load device on and off, receiving an analog input such as the temperature, the humidity and so on from a sensor and regulating a load device(500) to control an air conditioner; a DDC(Direct Digital Control) main board(300) for controlling the load device such as the valve, the actuator and so on to the received control order and taking charge of storing and performing a user program; a host computer(100) having the functions of editing, computer filing, downloading the user program; an RS-232C/RS-485 converter(200) for matching the connection of the host computer with the DDC main board with an RS-232 and an RS-485 rule.

Description

Auto air conditioning system and digital / analog communication apparatus applied thereto

The present invention relates to an automatic air conditioning system applied to building automation, and more specifically, to periodically control the temperature, humidity, etc. in each control station unit to automatically control the system load such as various valves and actuators installed in the building An automatic air conditioning system and a digital / analog communication apparatus applied thereto.

Recently, large-scale buildings such as buildings and apartments are automating management of cooling, heating, elevator control, and crime prevention in buildings. In general, automatic control in buildings is performed through the direct digital control (DDC) method. have.

Here, the DDC method refers to direct digital control, and refers to a method of causing a computer to perform analog control operations such as PID operations performed by an automatic controller in a feedback control system. In general, since a plurality of loops can be controlled by one computer by intermittent operation, there is an advantage in that the profit increases as it is used in a complicated process.

Therefore, recently, the development of a system that automatically controls the system load of various valves and actuators installed in a building by periodically monitoring temperature and humidity at each control station unit such as a building using the above DDC. It is being promoted at various angles.

The present invention has been devised in view of the present situation in the field of automatic control of buildings, and its object is to periodically monitor temperature, humidity, and the like at each control station, and transmit their status to a host computer. The present invention also provides an automatic air conditioning system and a digital / analog communication device applied thereto, which perform a function of automatically controlling a system load such as various valves and actuators installed in a building by receiving a control command from a host computer.

1 is a view showing an automatic air conditioning system of the present invention and a digital / analog communication apparatus applied thereto;

2 shows a digital / analog communication device of the present invention in more detail.

3 is a view showing a DDC main board of the present invention;

4 is a view showing a wiring structure of a power connection connector of the present invention;

5 is a view showing the wiring structure of the RS-485 communication port of the present invention;

6 is a view showing the wiring structure of the RS-232C communication port of the present invention;

7 and 8 are views illustrating a connection structure of the digital input terminal board and the first and second D / I connectors of the present invention;

9 is a view showing a connection structure of a digital output terminal board and a D / O connector of the present invention;

10 and 11 are views illustrating a connection structure between the analog input terminal board and the first and second A / I connectors 320 of the present invention;

12 and 13 are views illustrating a connection structure between the analog output terminal board and the first and second first A / O connectors 310 of the present invention;

14 is a view showing the configuration of the DIP switch of the present invention;

15 is a view showing the configuration of the LED unit of the present invention;

16 is a view showing the configuration of the jumper of the present invention;

17 is a view showing in detail the digital input terminal board of the present invention;

18 is a view showing a wiring structure of a connector portion of a digital input terminal board of the present invention;

19 and 20 are diagrams illustrating a D / I wiring structure of a digital input terminal board of the present invention;

Figure 21 illustrates in detail the digital output terminal board of the present invention;

Fig. 22 is a diagram showing the wiring structure of the connector portion of the digital output terminal board of the present invention;

Figure 23 is a detailed view of the analog input terminal board of the present invention;

24 is a diagram showing the wiring structure of the connector portion of the analog input terminal board of the present invention;

25 to 27 show the A / I wiring structure of the analog input terminal board of the present invention;

28 is a detailed view of the analog output terminal board of the present invention;

29 is a diagram showing the wiring structure of the connector portion of the analog output terminal board of the present invention;

30 to 31 show the A / O wiring structure of the analog output terminal board of the present invention;

32 is a diagram showing a control data transmission process from a host program to a DDC;

33 is a diagram showing a process of requesting status data from a host program to a DDC;

34 is a diagram illustrating a data transmission process from a setup DDC to a DDC;

35 is a diagram showing a data transmission request process from a setup DDC to a DDC.

<Description of the symbols for the main parts of the drawings>

100: host computer 200: RS-232C / RS-485 converter

300: DDC main board 301: LED part

302: DIP switch 303: analog interface

304: communication controller 305: flash memory

306: RAM 307: ROM

308: digital interface unit 309: jumper unit

310, 311: A / O connector 320, 321: A / I connector

330: D / O connector 340, 341: D / I connector

350: RS-232C communication port 360: RS-485 communication port

370: power connector 380: CPU

381: real time clock 382: reset switch

400: input / output terminal board 410: analog output terminal board

420: analog input terminal board 430: digital output terminal board

440: digital input terminal board 411, 421, 431, 441: connector

412: output adjustment unit 413, 425, 434, 444: power unit

414, 426, 435, 445: Terminal part 422, 442: Insulation part

423: protection circuit section 424, 443: jumper setting section

432: relay unit 433: output control switch

500: load device

A feature of the present invention for achieving the above object is to monitor the on / off state of the load device by input / output digital or analog signal, and to turn on / off the load device, the temperature, humidity from the sensor An input / output terminal board for receiving an analog input such as a valve and an actuator for controlling an air conditioner, and controlling a load device such as an actuator, and transmitting digital or analog data received from the input / output terminal board and receiving the received control command. It controls various load devices such as valves and actuators, and receives and processes various data from the DDC main board and the DDC main board which are responsible for storing and executing user programs, and according to the processing result of the DDC main board. Control the operation status and edit, compile and download the user program. The present invention provides an automatic air conditioning system including a host computer having a function and an RS-232C / RS-485 converter for matching the connection between the host computer and the DDC main board to an RS-232C and an RS-485 communication protocol.

Another feature of the present invention is RS-processing a connection state between a host computer having a function of processing various data, controlling the system according to the processing result, and editing, compiling, and downloading a user program. An automatic air conditioning system equipped with an RS-232C / RS-485 converter that conforms to 232C and RS-485 communication protocols, and monitors an on / off state of a load device by inputting / outputting a digital or analog signal. Input / output terminal board to turn on / off and receive analog input such as temperature and humidity from the sensor, and control load devices such as valves and actuators for controlling the air conditioner, and digitally connected to and received from the input / output terminal board. Or transmit analog data to the host computer through the RS-232C / RS-485 converter, and the host computer Digital / applied to an automatic air conditioning system including a DDC main board that executes control of the load device such as valves and actuators for control commands received from the controller, and stores and executes user programs transmitted from the host computer. It is to provide an analog communication device.

Hereinafter, with reference to the accompanying drawings, the present invention as described above will be described in more detail.

1 is a block diagram illustrating an automatic air conditioning system and a digital / analog communication apparatus applied thereto according to the present invention.

As shown, the present invention consists of a host computer 100, an RS-232C / RS-485 converter 200, a DDC main board 300, and an input / output terminal board 400.

The host computer 100 receives and processes various data from the DDC main board 300, and has a function of controlling the DDC main board 300 according to the processing result. It also has the ability to edit, compile and download user programs.

The RS-232C / RS-485 converter 200 is used to match the connection between the host computer 100 and the DDC main board 300 to RS-232C and RS-485 communication protocols.

The RS-232C is one of connection standards of a computer and an external device determined by the American Institute of Electronics Engineers (EIA), and is generally referred to as a serial port. In addition, RS-485 is the same as RS-232C, but the cable distance can be longer than that of RS-232C, and higher speed transmission can be achieved.

The DDC main board 300 transmits digital or analog data received from the input / output terminal board 400 to the host computer 100, and load devices 500 such as various valves and actuators for control commands received from the host computer 100. ) Control. It is also responsible for storing and executing user programs transmitted from the host computer 100.

The input / output terminal board 400 is connected to the DDC main board 300 and inputs / outputs a digital or analog signal to monitor the on / off state of the load device 500, and turn on / off the load device 500. In addition, an analog input such as temperature and humidity is received from the sensor, and a load device 500 such as a valve and an actuator for controlling an air conditioner and the like is adjusted.

As shown in FIG. 2, the input / output terminal board 400 includes two analog output terminal boards 410 for adjusting a driving load such as a valve for controlling a load device, and analog inputs such as temperature and humidity from a sensor. Two analog input terminal boards 420 for receiving, one digital output terminal board 430 for turning on and off the load, and two digital input terminal boards 440 for monitoring the on / off state of the load. It is composed of

3 is a view showing a DDC main board of the present invention, the power connection connector 370, RS-485 communication port 360, RS-232C communication port 350, LED unit 301, flash memory (flash memory) 305, ROM 307, RAM 306, CPU 380, Real Time Clock (RTC) 381, Jumper 309, Reset Switch 382, Analog Interface Unit 303, digital interface unit 308, communication control unit 304, DIP switch 302, A / I (Analog Input) connector 320 (321), A / O (Analog Output) connector 310 311, a D / I (Digital Input) connector 340 and 341, and a D / O (Digital Output) connector 330.

The power connection connector 370 inputs + 5V / 1.5A as the main power 371, and + 12V / 1A and -12V / 0.5A as the I / O isolation power 372. Enter each. In addition, the wiring is composed of five pins, as shown in Figure 4, the pin 1 pin -12V, pin 2 ground (GND2), pin 3 + 12V, pin 4 ground (GND1), and pin 5 + 5V is connected respectively.

The RS-485 communication port 360 is for isolated host communication, and the communication speed is basically 9600bps, and optionally 19200bps. In addition, a half duplex method is used as a communication method, and a MODICON protocol (MODbus-I) is used as a communication protocol. In addition, the error detection method is preferably a conventional CRC-16 method.

As shown in FIG. 5, the wiring structure of the RS-485 communication port 360 includes six pins, pins 1 to 3 are connected to the host computer 100, and pins 4 to 6 are connected to other DDC mains. It is connected to the board 300, where pin 1 is TRX +, pin 2 is TRX-, pin 3 is COM, pin 4 is TRX +, pin 5 is TRX-, pin 6 is COM.

The RS-232C communication port 350 is for debug monitor, the communication speed is 9600bps, and the communication protocol is applied with its own protocol (HITECOM). In addition, as an error detection method, an LRC (Check Sum) method is applied, and a maximum accommodating node supports 32 nodes.

In addition, the RS-232C communication port 350 is a communication port necessary for checking the state of the DDC main board 300 and can read the point value of the DDC main board 350 using a general commercial terminal program. In addition, the wiring structure connects a null modem cable as shown in FIG. That is, RX is connected to pin 2, TX is connected to pin 3, and ground (GND) is connected to pin 5.

Preferably in the present invention, two 32-point A / I connectors 320 and 321, two 16-point A / O connectors 310 and 311, and two 32-point D / I connectors 340 ( 341 and one 16 point D / O connector 330.

A connection structure of the digital input terminal board 440 and the first D / I connector 340 is shown in FIG. 7, and as shown in the pins 1 to 8, DI1, 3, 5, 7, 9, 11, 13, 15 is connected, and pins 13 to 20 are connected to DI2, 4, 6, 8, 10, 12, 14, and 16. In addition, ground (D_GND) is connected to pins 12 and 24, respectively.

In addition, the connection structure of the digital input terminal board 440 and the second D / I connector 341 is shown in FIG. 8, and as shown in the pins 1 to 8, DI17, 19, 21, 23, 25, and 27 are shown. , 29 and 31 are connected, and DI18, 20, 22, 24, 26, 28, 30 and 32 are connected to pins 13 to 20. In addition, ground (D_GND) is connected to pins 12 and 24, respectively.

The digital output terminal board 430 and the D / O connector 330 are connected to each other as shown in FIG. 9, and as illustrated, DO1, 3, 5, 7, 9, 11, 13, 15 is connected, and DO2, 4, 6, 8, 10, 12, 14, and 16 are connected to pins 13 to 20. In addition, pins 5 and 9 are connected to + 5V respectively.

The connection structure of the first A / I connector 320 connected to the analog input terminal board 420 is as shown in FIG. 10. As shown, AI_IN-1 at pin 1, MUX_A0 at pin 2, and MUX_A2 at pin 3 , MUX_CS1 on pin 4, + 15V on pin 5, A_GND on pin 6, -15V on pin 7, AI_IN-1 on pin 8, MUX_A1 on pin 9, MUX_A1 on pin 10, MUX_CS0 on pin 10, VCC + 5V on pin 11, and pin 12 + 15V, A_GND on pin 13 and -15V on pin 14 are connected respectively.

In addition, the connection structure of the second A / I connector 321 connected to the analog input terminal board 420 is shown in Figure 11, as shown in the pin 1 AI_IN-2, pin 2 MUX_A0, pin 3 At MUX_A2, pin 4 at MUX_CS1, pin 5 at + 15V, pin 6 at A_GND, pin 7 at -15V, pin 8 at AI_IN-2, pin 9 at MUX_A1, pin 10 at MUX_CS0, pin 11 at VCC + 5V, 12 + 15V is connected to Pin 15, A_GND to Pin 13, and -15V to Pin 14.

The connection structure of the first A / O connector 310 connected to the analog output terminal board 410 is shown in Figure 12, as shown in the pin 1 CLK-1, pin 2 to DATA-1, pin 3 STROBE-1, OUT-1 on pin 4, + 15V on pin 5, A_GND on pin 6, -15V on pin 7, CLK-1 on pin 8, DATA-1 on pin 9, STROBE-1 on pin 10, 11 VCC + 5V is connected to the 1st pin, + 15V to the 12th pin, A_GND to the 13th pin, and -15V to the 14th pin.

In addition, the connection structure of the second A / O connector 311 connected to the analog output terminal board 410 is shown in Figure 13, as shown in the pin 1 CLK-2, pin 2 DATA-2, 3 Pin 1 STROBE-2, Pin 4 OUT-1, Pin 5 + 15V, Pin 6 A_GND, Pin 7 -15V, Pin 8 CLK-2, Pin 9 DATA-2, Pin 10 STROBE-2 , VCC + 5V on pin 11, + 15V on pin 12, A_GND on pin 13, and -15V on pin 14.

The DIP switch 302 sets a program operating environment of the DDC main board 300, and the configuration is composed of seven switches D0 to D7 as shown in FIG. Set the ID (0 ~ 31) of the DDC main board through the combination of and D6 sets whether to start the user program, but if it is ON, it will be stopped and if it is OFF. In addition, D7 sets the communication speed, but it is set to 9600bps when on, 19200bps when off.

The LED unit 301 is used to display the operation state of the DDC main board 300 and check it. As shown in FIG. 15, eight LEDs are arranged in two columns as shown in FIG. 15. LED1 is the RX indicator of the host connection port, LED2 is the TX indicator of the host connection port, and LED3 is debugged from the upper left. The RX indicator of the connection port, LED4, and the TX indicator of the debug connection port are formed, LED5 is the RUN indicator from the upper right, and LED6 is the user program start indicator. LED5 and LED6 indicating the RUN display and the user program flash on a one-second cycle. The other LEDs 7 and 8 are separately used in the user program according to the user's request (Not Used).

The jumper 309 is used to change the operating state of the DDC main board 300. As shown in Fig. 16, the jumper section 309 is composed of JP1 and JP2, and three pins are provided. In JP1, if Pin 1 and Pin 2 are shorted, Watch-Dog Disable is enabled, while if Pin 2 and Pin 3 are shorted, Watch-Dog Enable is enabled. In JP2, when the pins 1 and 2 are shorted, the external CTS function is selected. When the pins 2 and 3 are shorted, the internal CTS-GND function is selected.

In general, the CPU 380 is preferably an INTEL 80x86 series chip having a clock frequency of 40 MHz. The CPU 380 is responsible for the overall control of the DDC main board 300 and has a built-in watch-dog for the entire system.

The flash memory 305, the RAM 306, and the ROM 307 each provide 256 Kbytes of storage space and store predetermined data input and output from the CPU 380. In addition, the real time clock (RTC) 381 provides an operating clock for each component of the DDC main board 300 including the CPU 380.

The analog interface unit 303 matches the analog signal, the digital interface unit 308 matches the digital signal, and the communication controller 304 inputs and outputs through the analog interface unit 303 and the digital interface unit 308. To control the signal.

The reset switch 382 resets the DDC main board 300 by a user's manipulation.

The digital input terminal board 440 monitors the on / off state of the load device 500, but has a D / I-16 point isolation type, and has a filtering function, a contact input function, a voltage input selection function, and the like. .

To this end, the digital input terminal board 440 is connected to the first or second D / I connectors 340 and 341 of the DDC main board 300 as shown in FIG. 17. Insulation part 442 connected to the connector part 441, a terminal part 445 composed of a plurality of terminals DI1 to DI16, and a jumper for selectively connecting the insulating part 442 and the terminal part 445. A setting unit 443 and a power unit 444 for supplying operating power, and the wiring structure of the connector unit 441 are as shown in FIG.

In addition, the digital input terminal board 440 provides two D / I wiring structures.

The first wiring structure is a dry contact method as shown in Fig. 19, and the input contact is shorted by pins 1 and 2 of JP1 and pins 1 and 2 of JP2 by the jumper setting unit 443. In this state, when the input contact is turned on, the DI insulation power supply AC / DC 24V is supplied to the photocoupler PT of the insulation portion 442 through the corresponding terminal of the terminal portion 445 and the forward diode D1.

As the second wiring structure, as shown in FIG. 20, an external voltage signal method is used. The wiring structure in which the voltage is supplied from the outside is the jumper setting unit 443, pins 2 and 3 of JP1, pins 2 and 3 of JP2. In this shorted state, power (DC 5-9V / 10mA) of the external device is supplied to the photocoupler PT of the insulation portion 442 through the corresponding terminal of the terminal portion 445 and the forward diode D1. Here, the range of the input power supply through the external device is preferably designed to limit to DC 5 ~ 9V / 10mA.

The digital output terminal board 430 turns on / off the load device 500 and is formed of a D / O-16 point relay insulated type. As shown in FIG. 21, the digital output terminal board 430 includes a connector 431 connected to the D / O connector 330 of the DDC main board 300 and a plurality of terminals DO1 to DO16. A configured terminal portion 435, a relay portion 432 connecting the connector portion 431 and the terminal portion 435, an output control switch 433 for turning the output state on and off, and supplying operating power It consists of a power unit 434. In addition, the wiring structure of the connector 431 is as shown in FIG.

The analog input terminal board 420 receives analog inputs such as temperature and humidity from a sensor, and has voltage and current input selection functions with A / I 16-point isolation.

As illustrated in FIG. 23, the analog input terminal board 420 may include a connector 421 connected to the first or second A / I connectors 320 and 321 of the DDC main board 300. An insulation portion 422 connected to the connector portion 421, a terminal portion 426 composed of a plurality of terminals AI1 to AI16, and a jumper setting portion for selectively connecting the insulation portion 442 and the terminal portion 426. 424, and a power unit 425 for supplying operating power, and a protection circuit unit 423 is inserted between the jumper setting unit 424 and the insulation unit 422. In addition, the wiring structure of the connector portion 421 is as shown in FIG.

The analog input terminal board 420 provides three A / I wiring structures.

The first wiring structure is 0-5V input method, and the wiring of the input contact point is made as shown in FIG. 25, the pins 1 and 2 of the jumper setting unit 424 JP1 are turned off, and the second pin of JP2 is turned off. And pin 3 are shorted (ON), the + signal of the analog sensor is directly supplied to the A / D converter 427 through the terminal of the terminal unit 426, the-signal is a terminal of the terminal unit 426 and The jumper setting unit 424 is supplied to the A / D converter 427 via pins 2 and 3 of JP2.

As a second wiring structure, 4 to 20 mA input method, and the connection of the input contact is shorted by pins 1 and 2 of JP1, pins 2 and 3 of JP2 as shown in FIG. ON), the + signal of the analog sensor is supplied to the A / D converter 427 via the terminals of the terminal unit 426 and the pins 1 and 2 of the jumper setting unit 424 JP1, and the-signal is The A / D converter 427 is supplied to the A / D converter 427 via the terminals of the terminal unit 426 and pins 2 and 3 of the jumper setting unit 424 JP2.

The third wiring structure is a power supply type of 4-20 mA input method, and the power is supplied from the DDC main board 300 to the sensor side to receive a 4-20 mA signal, but the wiring is shown in FIG. 27. Jumper setting section 424 With the short circuit of pins 1 and 2 of JP1 and pins 1 and 2 of JP2, the + supply power supply (AC / DC 24V) is connected to the terminal of the terminal section 426 and the jumper setting section ( 424) It is supplied to the + signal terminal of the analog sensor via pins 1 and 2 of JP2, and-signal of the analog sensor is connected to the terminals of the terminal unit 426 and the pins 1 and 2 of the jumper setting unit 424 JP1. Via the A / D converter 427 is supplied.

The analog output terminal board 410 adjusts driving loads such as valves and actuators for controlling the load device 500. It is an 8-bit accuracy D / A conversion type that has an AC 24V 3-wire actuator control function and a 5-10V output variable function.

To this end, the analog output terminal board 410 is connected to the first or second A / O connectors 310 and 311 of the DDC main board 300 as illustrated in FIG. 28. A terminal unit 414 including a plurality of terminals A01 to A08, an output adjusting unit 412 connecting the connector 411 and the terminal unit 414, and a power unit 413 to supply operating power to the terminal unit 414. The wiring structure of the connector 411 is configured as shown in FIG.

The analog output terminal board 410 provides two A / O wiring structures.

As the first wiring structure, 0 ~ 10V output method is used. As shown in FIG. 30, the terminal of the terminal unit 414 is divided into a plurality of channels (CH1, CH2 ...), and the actuator + is connected to the CH1_OUT terminal and the GND terminal. And-connect stages, respectively.

As a second wiring structure, a power supply type 0 to 10V output method is provided. As shown in FIG. 31, the terminal unit 414 is divided into a plurality of channels (CH1, CH2 ...), and the actuator is connected to the CH1_OUT terminal and the GND terminal. In addition to connecting the + and-stages, the actuator power supply (AC / DC 24V) is supplied to the power (power) of the actuator.

In addition, two DDC communication protocols are provided for smooth communication control of the present invention.

The first provides the MODICON protocol, which is connected to the host program (AutoBase), and the second, the HITECOM protocol, which is connected to the setup DDC.

The MODICON protocol is a protocol used by a PLC produced by MODICON Inc. and is widely used among automation related protocols. Since AutoBase used as a host program also supports the MODICON protocol, it is preferable to use the MODICON protocol in the present invention.

Here, the preferred hardware specification of the RS-485 serial communication method, the communication speed is 9600 or 19200bps, the data length is 8 bits, the stop bit is 1 stop bit, the parity check is Non Parity, communication mode Is set to binary mode.

Referring to FIG. 32, a process of transmitting control data from a host program (AutoBase) to a DDC is described. In the case of transmitting data to a DDC in AutoBase, it is usually a case of setting D / O and A / O. When the control data is transmitted, the DDC performs control when the DDC ID is matched and transmits the received data. The control procedure is as shown in FIG.

On the other hand, referring to FIG. 33, the process of requesting the state data from the host program (AutoBase) to the DDC, in the case of requesting data from the DDC in the AutoBase, usually reads the state of D / I and A / I. When the status data request signal is transmitted, the DDC transmits the data of the current status if it compares with its own DDC ID, and the control procedure is as shown in FIG.

In addition, the HITECOM protocol is a protocol used to download a user program to the DDC and to check the DDC state. Basic communication method uses RS-485 serial communication method. It defines the basic communication method, communication protocol and communication contents. The hardware specification of the RS-485 serial communication method is as described above.

Looking at the data transmission process from the setup DDC to the DDC with reference to FIG. 34, when there is data to be transmitted from the setup DDC to the DDC, it transmits in the order shown. That is, if there is data to be transmitted, the setup DDC transmits the data. The DDC transmits an ACK when data is received normally, and sends a NAK when an error exists in the LRC check. After transmitting data from the setup DDC, if there is no response from the DDC, a timeout occurs and data is transmitted again. When the DDC receives the ACK, it checks whether there is more data. If there is more data, the above procedure is transmitted in the same way. If the data no longer exists, the EOT is transmitted and terminated.

Meanwhile, referring to FIG. 35, a process of requesting data transmission from the setup DDC to the DDC will be described. When data to be transmitted from the DDC to the setup DDC exists, the DDC transmits the data requested by the data transmission request from the setup DDC. The setup DDC requests data when the data of the DDC is needed. The DDC transmits the requested data. If the data request is an LRC error, it sends a NAK. In the setup DDC, if a timeout occurs after a data request, the request is attempted again, and a communication error occurs when the timeout occurs three or more times. The setup DDC sends an ACK upon receipt of the data and a NAK on error. When the DDC receives the ACK, if there is more data to be transmitted, the data is transmitted. If the data is not transmitted, the DDC transmits the EOT to terminate the data transmission.

As described above, according to the automatic air conditioning system of the present invention and the digital / analog communication apparatus applied thereto, the temperature, humidity, and the like are periodically monitored at each control station to transmit their status to a host computer. In addition, by receiving the control command from the host computer to perform the function to automatically control the system load of various valves and actuators, etc. installed in the building, to create a user-defined program according to the user's needs to download (down load) It can be run and operated, all inputs / outputs can be set by software, and the input / output and CPU, the main processor part, are completely insulated, so the field application capability is very useful.

Claims (15)

Input / output digital or analog signals to monitor the on / off status of the load device 500 such as valves and actuators, and turn on / off the load device 500, and from the sensor, analog such as temperature and humidity. Input and output terminal board 400 for adjusting the load device 500 for receiving an input, and controlling the air conditioner, It is connected to the input / output terminal board 400 to transmit digital or analog data received therefrom, and executes control of load devices 500 such as valves and actuators for the received control commands, and stores and executes user programs. DDC main board 300 in charge of, A host computer having a function of receiving and processing various data from the DDC main board 300, controlling an operation state of the DDC main board 300 according to the processing result, and editing, compiling, and downloading a user program. 100, and Automatic air conditioning system comprising an RS-232C / RS-485 converter 200 for matching the connection between the host computer 100 and the DDC main board 300 by RS-232C and RS-485 communication protocol . The method of claim 1, wherein the DDC main board 300 is Power monitor connector 370 for inputting main power and I / O isolated power, RS-485 communication port 360 for performing isolated host communication, and a debug monitor to check the state of the DDC main board 300. RS-232C communication port 350 to perform, the A / I connector 320 and 321 connected to the analog input terminal board 420, the A / O connector 310 connected to the analog output terminal board 410 311, D / I connectors 340 and 341 connected to the digital input terminal board 440, D / O connectors 330 connected to the digital output terminal board 430, and the DDC main board. DIP switch 302 for setting the program operating environment of the 300, LED unit 301 to display the operation state of the DDC main board 300 to check the operation state of the DDC main board 300 In addition to the jumper unit 309 to control, the overall control of the DDC main board 300, The CPU 380 has a built-in watch-dog, and the flash memory 305 and RAM 306 which provide 256 Kbytes of storage space and store predetermined data input / output from the CPU 380. ) And ROM 307, a real time clock 381 providing an operation clock to each component of the DDC main board 300 including the CPU 380, an analog interface unit 303 matching an analog signal, and a digital signal. A digital interface unit 308 for matching a signal, a communication controller 304 for controlling signals input and output through the analog interface unit 303 and the digital interface unit 308, and the DDC main board by a user's operation. And a reset switch (382) for resetting 300. 3. The first D / I connector 340 connected to the digital input terminal board 440 has DI1,3,5,7,9,11,13,15 on pins 1-8. Connect pins 13 to 20 to connect DI2, 4, 6, 8, 10, 12, 14, 16, and connect pins 12 and 24 to ground (D_GND), respectively. The second D / I connector 341 connected to the digital input terminal board 440 connects DI17, 19, 21, 23, 25, 27, 29, 31 to pins 1 to 8, and pins 13 to 20. The pin 18 is connected to DI18, 20, 22, 24, 26, 28, 30, 32, and pin 12 and pin 24 are connected to connect the ground (D_GND), respectively. The D / O connector 330 connected to the digital output terminal board 430 connects DO1, 3, 5, 7, 9, 11, 13, and 15 to pins 1 to 8. , 13 pin to 20 pin DO2, 4, 6, 8, 10, 12, 14, 16 is connected, and the 9 and 21 pin is an automatic air conditioning system characterized in that the connection is connected to + 5V respectively. The first A / I connector 320 connected to the analog input terminal board 420 is AI_IN-1 at pin 1, MUX_A0 at pin 2, MUX_A2 at pin 3, MUX_CS1 at pin 4, and the like. + 15V on pin 5, A_GND on pin 6, -15V on pin 7, AI_IN-1 on pin 8, MUX_A1 on pin 9, MUX_CS0 on pin 10, VCC + 5V on pin 11, + 15V on pin 12, and pin 13 Connect -15V to A_GND, 14 pin, The second A / I connector 321 connected to the analog input terminal board 420 is AI_IN-2 on pin 1, MUX_A0 on pin 2, MUX_A2 on pin 3, MUX_CS1 on pin 4, + 15V on pin 5, 6 Pin A_GND, Pin 7 -15V, Pin 8 AI_IN-2, Pin 9 MUX_A1, Pin 10 MUX_CS0, Pin 11 VCC + 5V, Pin 12 + 15V, Pin 13 A_GND, Pin 14 -15V Automatic air conditioning system characterized in that the connection to connect each. The first A / O connector 310 connected to the analog output terminal board 410 is CLK-1 on pin 1, DATA-1 on pin 2, STROBE-1 on pin 3, and pin 4 on the first A / O connector 310. On OUT-1, + 15V on pin 5, A_GND on pin 6, -15V on pin 7, CLK-1 on pin 8, DATA-1 on pin 9, STROBE-1 on pin 10, VCC + 5V on pin 10, Connect + 15V to pin 12, A_GND to pin 13, and -15V to pin 14. The second A / O connector 311 connected to the analog output terminal board 410 is CLK-2 on pin 1, DATA-2 on pin 2, STROBE-2 on pin 3, OUT-1 and 5 on pin 4. + 15V on pin 6, A_GND on pin 6, -15V on pin 7, CLK-2 on pin 8, DATA-2 on pin 9, STROBE-2 on pin 10, VCC + 5V on pin 11, + 15V on pin 12, Automatic air conditioning system characterized in that the wiring to connect the 13 pin A_GND, 14 pin -15V respectively. The DIP switch 302 is composed of seven switches D0 to D7, wherein D0 to D5 set IDs (0 to 31) of the DDC main board through a series of combinations, and D6 Sets whether to start the user program, but if it is ON (stop), it is started when the OFF (OFF), D7 sets the communication speed, 9600bps if it is ON, 19200bps it is characterized in that it is set to Automatic air conditioning system. According to claim 2, wherein the LED unit 301 is arranged in two columns of eight LEDs, LED1 is the RX indicator of the host connection port from the upper left, LED2 is the TX indicator of the host connection port, LED3 is of the debug connection port RX indicator, LED4 is the TX indicator of the debug connection port, LED5 is the RUN indicator from the upper right, LED6 is the user program start indicator is formed, the RUN indicator and the user ( User) The automatic air conditioning system, characterized in that the LED5 and LED6 to display a program to flash in a 1 second cycle. 3. The jumper unit 309 of claim 2 is composed of JP1 and JP2 provided with three pins, respectively, and in the JP1, when the pins 1 and 2 are shorted, the watch function is disabled. On the other hand, when the pins 2 and 3 are shorted, the watchdog function is enabled.In the JP2, when the pins 1 and 2 are shorted, the external CTS function is selected and the pins 2 and 3 are selected. System to allow the internal CTS-GND function to be selected when the device is shorted. The input / output terminal board 400 of claim 1, Analog output terminal board 410 for adjusting driving loads such as valves for controlling the load device, analog input terminal board 420 for receiving analog inputs such as temperature and humidity from sensors, and digital outputs for turning on / off the load device. And a digital input terminal board (440) for monitoring the on / off state of the load device. The method of claim 10, wherein the digital input terminal board 440, A connector portion 441 connected to the first or second D / I connectors 340 and 341 of the DDC main board 300, an insulation portion 442 connected to the connector portion 441, and a plurality of terminals ( A terminal portion 445 composed of DI1 to DI16, a jumper setting portion 443 selectively connecting the insulation portion 442 and the terminal portion 445, and a power portion 444 for supplying operating power. Automatic air conditioning system characterized in that. The method of claim 10, wherein the digital output terminal board 430, A connector portion 431 connected to the D / O connector 330 of the DDC main board 300, a terminal portion 435 composed of a plurality of terminals DO1 to DO16, the connector portion 431 and the terminal portion And a relay unit (432) connecting the (435), an output control switch (433) for turning on / off its output state, and a power unit (434) for supplying operating power. The method of claim 10, wherein the analog input terminal board 420, A connector portion 421 connected to the first or second A / I connectors 320 and 321 of the DDC main board 300, an insulation portion 422 connected to the connector portion 421, and a plurality of terminals ( A terminal unit 426 composed of AI1 to AI16, a jumper setting unit 424 for selectively connecting the insulator 442 and the terminal unit 426, and a power unit 425 for supplying operating power; Automatic air conditioning system characterized in that. The method of claim 13, wherein the analog output terminal board 410, The connector part 411 connected to the first or second A / O connectors 310 and 311 of the DDC main board 300, the terminal part 414 including a plurality of terminals A01 to A08, and the connector And an output adjustment unit (412) for connecting the unit (411) and the terminal unit (414), and a power unit (413) for supplying operating power. RS-232C is connected to a host computer 100 having a function of processing various data, controlling the system according to the processing result, and editing, compiling, and downloading a user program and the host computer 100. In the automatic air conditioning system provided with the RS-232C / RS-485 converter 200 to match with the RS-485 communication protocol, Input / output digital or analog signals to monitor the on / off state of the load device 500, turn on / off the load device 500, and receive an analog input such as temperature and humidity from a sensor, Input / output terminal board 400 for adjusting the load device 500, such as a valve and actuator for controlling the back, Connected to the input and output terminal board 400 and transmits the digital or analog data received therefrom to the host computer 100 through the RS-232C / RS-485 converter 200, the control received from the host computer 100 It includes a DDC main board 300 for executing the control of the load device 500, such as various valves and actuators for the command, and for storing and executing the user program transmitted from the host computer 100. Digital / analog communication device applied to an automatic air conditioning system.