KR200337610Y1 - Telemetering System with Duplicated Modems - Google Patents

Abstract

The present invention provides a remote meter reading system through a public telephone network (PSTN) or a dedicated network in a remote meter reading system that performs meter reading of a calorimeter, monitoring a fault condition, setting operating parameters, and monitoring supply pressure. In transmission, when there is a communication failure in the communication modem, the system automatically switches to the spare modem without changing the communication line and transmits the meter reading result data through the spare modem so that the remote meter reading can be carried out smoothly. It is about.

Remote meter reading master calorimeter module according to the present invention is a calorie calculation unit for storing and displaying the result calculated by calculating the amount of heat and fluid consumed in the heat device of each generation or heat use complex; And the main communication modem and the preliminary communication modem, and transmits an "AT (Attention Code)" command to the main communication modem when transmitting the meter reading data received from the calorie calculating unit to the remote meter reading center. A communication module for recognizing a failure state when receiving an "ERROR" signal from a main communication modem, transferring a communication connection to the preliminary communication modem, and transmitting the meter data to the remote meter reading center through the preliminary communication modem; It is characterized by.

Description

Telemetering System with Duplicated Modems

The present invention relates to a remote meter reading system having a multi-communication modem, and more particularly in a remote meter reading system that performs the reading of the calorimeter, monitoring the fault condition, setting operating parameters, monitoring the supply pressure, and the like, When sending meter reading data to remote meter reading center through public telephone network (PSTN) or dedicated network, if communication failure occurs in communication modem, it automatically transfers to spare modem without changing communication line and sends meter reading data through spare modem. The present invention relates to a system for remote meter reading with multiple communication modems for smooth remote meter reading.

Each household in a group dwelling, such as an apartment or apartment house that provides central heating or district heating, has a calorimeter installed to measure the calories used by each household. A calorimetry module for remote meter reading that measures the value remotely has been proposed.

1 is a block diagram showing a schematic configuration of a remote meter reading system 100 according to the prior art.

The conventional remote meter reading system 100 includes a master meter calorimeter module 110 for remote metering, a slave calorimeter module 120 and 122 for remote meter reading, a communication module 140, a communication network 150, and a remote meter reading center 160. .

Here, the slave meter calorimeter module 120, 122 for remote reading includes a calorific calculator 130, a supply temperature sensor 132, a recovery temperature sensor 134, a flow sensor 136, a pressure detector 138, and the like. do. In addition, the communication module 140 has a configuration including a meter reading unit 142, a calculation module connection unit 144, a communication control unit 146, a modem unit 148 and the like.

In addition, the communication module 140 and one remote meter reading calorimeter module 120 are combined to be referred to as a remote meter reading master calorimeter module 110. Another remote metering slave calorimeter module 122 is cascaded in parallel to the communication module 140 in the remote meter reading master calorimeter module 110. Each of the remote meter reading master calorimeter module 110 and the remote meter reading slave calorimeters 120 and 122 are usually manufactured in the form of a printed circuit board (PCB).

Each remote meter reading calorimeter module (120, 122) is installed in each generation or heat use complex, calculates the heat used in the heat appliances, such as the boiler of each generation or heat use complex, monitors various fault conditions and heat The pressure of the fluid supplied to the instrument is detected. Various meter reading data, fault status data and fluid pressure data, including the calories calculated by each remote meter reading calorimeter module 120 and 122, are provided to the communication module 140.

Each of the remote meter reading calorimeter modules 120 and 122 is connected in parallel to the communication module 140. The communication module 140 performs serial communication to collect calories, supply pressures, and various failure states read from each of the remote meter reading calorimeter modules 120 and 122, and store them in the meter reading unit 142. Data related to the amount of heat, supply pressure, and various failure states collected and stored in the communication module 140 may be transmitted to the remote meter reading center 160 via the communication network 150 through the modem unit 140 whenever a meter reading request is requested from the remote meter reading center 160. Is sent).

The remote meter reading master calorimeter module 110 is installed only in one household or one heat use complex per group residential complex, such as an apartment or apartment house, or the same unit of apartment, and the slave meter calorimeter module 122 for remote meter reading Installed in each generation or heat use complex is connected in parallel to the communication module 140 of the master calorimeter module 110 for remote meter reading.

The communication network 150 uses a public telephone network (PSTN) or a dedicated network for communication with the remote meter reading center 160 in the communication module 140.

The remote meter reading center 160 is configured as a computer system connected to the communication module 140 through a communication network 150 at a remote place to collect respective meter data collected and stored in the communication module 140. That is, the remote meter reading center 160 manages and operates the remote meter reading calorimeter modules 120 and 122, collects various meter reading data from the remote meter reading calorimeter modules 120 and 122, and uses the collected meter reading data. Statistical analysis, monitoring the fault status of the remote meter reading calorimeter module (120, 122), operating parameter setting and supply pressure of the remote meter reading calorimeter module (120, 122) to manage the status of the calorimeter installed in the field.

In the conventional remote meter reading system 100 configured as described above, when the meter reading data is transmitted from the master meter calorimeter module 110 for remote meter reading through the communication network 150 to the remote meter reading center 160, the modem in the communication module 140 The meter 148 is transmitted using the unit 148.

At this time, the modem unit 140 provided in the communication module 140 is composed of a single modem, so that when a communication failure occurs due to an abnormality or failure of the modem unit 140 during meter reading data transmission, the remote meter reading is properly performed. You won't lose.

Therefore, an administrator or the like visits a group residence where the remote meter reading master calorimeter module 110 is installed, and has to diagnose and repair the modem unit 148 of the communication module 140 one by one. There was a problem that the remote meter reading does not work properly until the repair is completed.

On the other hand, the purpose of the remote meter reading is to reduce the manpower by performing the meter reading depending on the remote meter reading system without going directly to people far away. Therefore, there is a tendency that the maintenance of the remote meter reading system is poor, and therefore, there is a demand for a remote meter reading system that has little trouble such as communication failure and has high durability in remote meter reading.

In order to solve the above problems, the present invention, in a remote meter reading system that performs the reading of the calorimeter, monitoring the fault condition, setting operating parameters, monitoring the supply pressure, etc., the reading result data is public telephone network (PSTN) Alternatively, when a communication failure occurs when transmitting to a remote meter reading center through a dedicated network, the system provides a remote meter reading system having multiple communication modems for smooth remote meter reading by automatically changing and transmitting a communication modem to a spare modem without changing the communication line. There is a purpose.

1 is a block diagram showing a schematic configuration of a remote meter reading system according to the prior art,

2 is a block diagram schematically showing the configuration of a remote meter reading master calorimeter module in a system for remote meter reading with multiple communication modems according to an embodiment of the present invention;

3 is a block diagram showing a communication connection between a communication control unit, a modem switching unit, and each modem.

<Description of Symbols for Main Parts of Drawings>

100: remote meter reading system

110: master calorimeter module for remote meter reading

120, 122: slave calorimeter module for remote meter reading

130: calorie calculation unit 132: supply temperature sensor

134: recovery temperature sensor 136: flow rate detection unit

138: pressure sensing unit 140: communication module

142: meter reading unit 144: operation module connection unit

146: communication control unit 148: modem unit

150: communication network 160: remote meter reading center

200: master calorimeter module for remote meter reading

201: display unit 202: operation and control unit

203: storage unit 204: power unit

205: communication module connection part 206: terminal part

210: calorie calculation unit 220: communication module

222: communication control unit 224: modem switching unit

226: master modem 228: slave modem

230: slave calorimeter module for remote meter reading

In order to achieve the above object, the present invention, when transmitting the meter reading data to the remote meter reading center remotely when a failure in the main communication modem is automatically changed to a preliminary communication modem to enable a smooth remote meter reading A remote meter reading calorimeter device comprising: a calorie calculator configured to store and display a result calculated by calculating a fluid and a calorie consumed by a corresponding heat mechanism of each generation or heat use complex; And the main communication modem and the preliminary communication modem, and transmits the meter reading data, the fault status data, and the fluid pressure data transmitted from the calorie calculating unit to the main communication modem at the time of transmission to the main communication modem. &Quot; ERROR " signal received from the main communication modem after transmitting the command, recognizes the failure state, transfers the communication connection to the preliminary communication modem, and reads the meter data and the failure state data through the preliminary communication modem. And it provides a remote meter reading calorimeter device having a multiple communication modem comprising a communication module for transmitting the fluid pressure data to the remote meter reading center.

In addition, according to another object of the present invention, when transmitting the meter reading data to the remote meter reading center remotely, if there is a failure in the main communication modem, the multi-mode communication modem is automatically changed to a preliminary communication modem to make a smooth remote meter reading A remote meter reading system, comprising: a slave meter reading device for remote meter reading, storing and displaying a result calculated by calculating the amount of fluid and heat consumed in a corresponding thermal apparatus of each generation or heat use complex; The main communication modem and the preliminary communication modem are provided for detecting, storing and displaying the supply temperature of the fluid, the recovery temperature of the fluid, the flow rate of the fluid and the pressure of the fluid, and supplying the fluid upon request of the meter reading from the remote meter reading center. The temperature, the recovery temperature of the fluid, the flow rate of the fluid and the pressure of the fluid is transmitted through the main communication modem, if the failure of the main communication modem transfers the communication connection to the preliminary communication modem to the A master calorimeter device for remote meter reading through which the supply temperature of the fluid, the recovery temperature of the fluid, the flow rate of the fluid and the pressure of the fluid are transmitted to the remote meter reading center; And a communication network providing a transmission path to transmit the supply temperature of the fluid, the recovery temperature of the fluid, the flow rate of the fluid, and the pressure of the fluid discharged from the remote meter reading master calorimeter device to the remote meter reading center. A remote meter reading system having multiple communication modems is provided.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related known configuration or function may obscure the subject matter of the present invention, the detailed description thereof will be omitted.

2 is a block diagram schematically illustrating the configuration of a remote meter reading master calorimeter module 200 in a system for remote meter reading with a multiple communication modem according to an embodiment of the present invention.

The remote meter reading master calorimeter module 200 according to the present invention includes a calorie calculating unit 210 for storing and displaying a result calculated by calculating a calorie consumed by a corresponding heat mechanism of each generation or a heat use complex, and the calorie calculating unit ( It has a configuration including a communication module 220 for transmitting the meter reading data on the heat amount or flow rate received from the 210 to the remote meter reading center (160).

The calorific value calculation unit 210 detects a supply temperature, a recovery temperature, a flow rate, a pressure, and the like of the fluid from the supply temperature sensor 132, the recovery temperature sensor 134, the flow rate detection unit 136, and the pressure detection unit 138. Store and display and transmit to communication module 220.

Each generation or heat use complex is provided with a supply temperature sensor 132, a recovery temperature sensor 134, a flow rate sensing unit 136, a pressure sensing unit 138, and the like. The configuration of the sensor 134, the flow rate sensing unit 136, the pressure sensing unit 138, and the calorific value calculating unit 210 is configured to configure the remote meter reading slave calorimeter module 230.

Here, the supply temperature sensor 132 is composed of a temperature resistance sensor which is installed in the supply pipe to which the fluid is supplied and which flows through the supply pipe, that is, the resistance value is changed according to the temperature of the water. The supply temperature sensor 132 detects the temperature of the fluid and provides the detected supply temperature of the fluid to the calorific value calculator 210.

The recovery temperature sensor 134 is configured as a temperature resistance sensor installed in a reflux tube through which the heat-exchanged fluid is recovered and whose resistance value changes according to the temperature of the fluid recovered through the reflux tube. The recovery temperature sensor 134 provides the recovery temperature of the detected fluid to the calorific value calculator 210.

The flow rate detection unit 136 detects the flow of the fluid passing through the supply pipe of the calorimeter, and calculates the supply flow rate using the flow rate representing the flow of the fluid and the cross-sectional area of the supply pipe. In addition, the flow rate detection unit 136 generates one flow rate pulse for each calculated unit flow rate, and provides the generated flow rate pulses to the calorific value calculation unit 210.

The pressure sensing unit 138 is configured as a pressure sensor installed in the supply pipe of the calorimeter and the amount of current changes according to the pressure of the fluid flowing in the supply pipe. The amount of current representing the change in pressure detected by the pressure sensing unit 138 is provided to the calorific value calculating unit 210 so that the calorific value calculating unit 210 can sense the pressure of the fluid.

First, the calorie calculation unit 210 will be described in more detail.

The calorific value calculation unit 210 includes a display unit 201, a calculation and control unit 202, a storage unit 203, a power supply unit 204, a communication module connection unit 205, a terminal unit 206, and the like.

The display unit 201 displays the supply temperature, the recovery temperature, the supply calorific value, the supply flow rate, the fault state, the fluid pressure, etc. calculated by the calculation and control unit 202 in numbers, letters, or figures. The calorific value or flow rate displayed on the display unit 201 is displayed as a cumulative value each time the calorific value and the flow rate of the supply are calculated by the calculation and the control unit 202, and are set to zero values for a predetermined period, for example, monthly. Reset.

The calculation and control unit 202 uses the supply temperature, recovery temperature, and flow rate pulses provided by the supply temperature sensor 132, the recovery temperature sensor 134, and the flow rate detection unit 136 through the wiring of the terminal unit 206 to calculate the amount of heat. The pressure of the fluid according to the change in the amount of current provided from the pressure sensing unit 138 is calculated through the wiring of the terminal unit 206. The calorific value and the fluid pressure calculated by the calculation and the control unit 202 are as follows.

That is, the calculation and control unit 202 calculates the temperature difference Δt between the supply temperature and the recovery temperature, counts the flow rate pulses, calculates the flow rate value, and converts the heat conversion coefficient K into the temperature difference Δt and the flow rate value. Multiply by) to get calories. The calorific value is calculated at regular time intervals or whenever a flow rate pulse occurs in the flow rate sensing unit 136, and is transmitted to the remote meter reading center 160 whenever a meter reading request is requested from the remote meter reading center 160.

In addition, the calculation and control unit 202 is generated according to the pressure of the fluid in the pressure sensing unit 138 converts the provided current value of 4 mA ~ 20 mA to a voltage value, and converts the converted voltage value into a digital voltage value The pressure data is stored in the storage unit 203. The pressure data generated by the calculation and control unit 202 is transmitted to the remote meter reading center 160 along with the meter data of the calorific value whenever required by the remote meter reading center 160.

In addition, the calculation and control unit 202 monitors the failure of the supply temperature sensor 132, the recovery temperature sensor 134, the flow rate detection unit 136, the pressure detection unit 138, and the power supply unit 204. do. The failure monitoring functions of the supply temperature sensor 132, the recovery temperature sensor 134, the flow rate detection unit 136, the pressure detection unit 138, and the power supply unit 204 by the calculation and control unit 202 are described below.

That is, the calculation and control unit 202 sets the range of the temperature upper limit value and the temperature lower limit value with respect to the supply temperature sensor 132 and the recovery temperature sensor 134, respectively, and thus the supply temperature sensor 132 and the recovery temperature sensor 134. If the supply temperature and the recovery temperature detected by) are outside the ranges of the set temperature upper limit value and the lower limit value, it is determined that the supply temperature sensor 132 and the recovery temperature sensor 134 have failed, and the failure state is determined by the remote meter reading center ( 160).

In addition, the calculation and control unit 202 sets the upper limit value range to the number of flow pulses generated by the flow rate detection unit 136, when the number of flow pulses generated by the flow rate detection unit 136 is out of the set upper limit value. The flow rate detecting unit 136 determines that a failure has occurred, and reports the failure state to the remote meter reading center 160.

In addition, the calculation and control unit 202 sets the upper limit current value corresponding to the upper limit pressure value and the lower limit current value corresponding to the lower limit pressure value, and the upper limit current value and the lower limit at which the current value measured by the pressure sensing unit 138 is set. If it is out of the range of the current value, it is determined that the failure occurred in the pressure sensing unit 138, and reports the failure state to the remote meter reading center 160. The upper and lower limit current values may be arbitrarily determined as necessary, but the lower limit current value is preferably 3 mA to 5 mA and the upper limit current value is 15 mA to 25 mA.

The calculation and control unit 202 determines that a failure occurs in the power supply unit 204 when a sudden voltage change or the like occurs in the power supply unit 204, and reports the failure state to the remote meter reading center 160.

The storage unit 203 checks reading data such as supply temperature, recovery temperature, supply calorific value, supply flow rate, and fluid pressure calculated by the operation and control unit 202 and the fault status monitored by the operation and control unit 202 at regular intervals. For example, various parameters required for operation of the remote meter reading calorimeter module 230 by storing time, daily, monthly, and yearly, for example, ID, calorie conversion factor, upper and lower temperature values, and upper and lower flow rate pulse values of the remote meter reading calorimeter module 230. , Upper and lower current values are stored.

The power supply unit 204 is provided with an AC-DC converter, and converts the AC power provided through the wiring of the terminal unit 206 into a DC power supply to the remote meter reading slave calorimeter module 230 and the communication module 220. When a failure occurs in the commercial AC power input to the power supply unit 204, power supply through the battery is performed under the control of the operation and control unit 202 so that the power supply is not interrupted.

The communication module connection unit 205 is connected in parallel to the communication module 220 through the multipoint bus A, and under the control of the operation and control unit 202, the meter reading data and the fault state data stored in the storage unit 203. And transmit fluid pressure data to the communication module 220 via the multipoint bus A. FIG.

The terminal unit 206 is a terminal configured to connect only wires by mounting only terminal terminal components in the slave meter calorimeter module 230 for remote meter reading in the PCB form. The terminal unit 206 is a terminal having a plurality of wires for introducing an external telephone line and a commercial AC power line into each generation or heat use complex and for indoor wiring in each generation or heat use complex. The terminal unit 206 supplies power required for the power supply unit 204 and the communication module 220 through a commercial AC power line. The supply temperature sensor 132, the recovery temperature sensor 134, the flow rate sensing unit 136, and the pressure sensing unit 138 are connected to the wiring of the terminal unit 206, and the operation and control unit 202 and the power supply unit ( 204) and the like.

Meanwhile, the communication module 220 is included in the remote metering master calorimeter module 200 to collect meter reading data, fault state data, and fluid pressure data of each of the remote metering slave calorimeter modules 230, 120, and 122. Performs a function of reporting to the meter reading center 160, the operation module connection unit 144, meter reading unit 142, communication control unit 222, modem switching unit 224, master modem 226 and slave modem 228 Has a configuration including

Each of the remote meter reading slave calorimeter modules 230, 120, and 122 is connected in parallel to the operation module connection unit 144 via a multipoint bus A, and each of the remote meter reading slave calorimeter modules 230, 120, and 122 is connected. Meter reading data, fault condition data and fluid pressure data are provided in a serial communication manner.

The multi-point bus A is composed of two wires, and the communication module connection portions 205 of the remaining remote metering slave calorimeter module 122 other than the remote metering slave calorimeter module 230 are connected in parallel. .

The meter reading unit 142 temporarily stores meter reading data, fault state data, and fluid pressure data provided by each remote metering slave calorimeter module 230, and stores various parameter values necessary for the operation of the communication module 220. .

The communication control unit 222 temporarily stores the meter reading data, the fault state data, and the fluid pressure data of the plurality of calorie calculating units 210 connected to the operation module connection unit 144 in the meter reading unit 142, and the remote meter reading center 160. When there is a meter reading request in, the data stored in the meter reading unit 142 is transmitted to the remote meter reading center 160 through the master modem 226 or the slave modem 228 to enable a quick response. In addition, the communication control unit 222 reports a failure state to the remote meter reading center 160 when a significant failure occurs in each calorie calculation unit 210.

The communication control unit 222 checks the communication state of the master modem 226 when the meter reading request is requested by the remote meter reading center 160, and controls the modem switching unit 224 when the communication failure of the master modem 226 is performed. In step 226, it switches to the slave modem 228 to process the response to the meter reading request. Here, the communication control unit 222 transmits an "AT (Attention Code)" command to the master modem 226, and recognizes the master modem 226 as a failure state when the "ERROR" signal is received from the master modem 226. The control signal is transmitted to the modem switching unit 224 to switch the communication connection.

The modem switching unit 224 transfers the communication connection with the calorific calculator 210 through the master modem 226 to the communication connection through the slave modem 228 according to the control signal of the communication control unit 222. The modem switching unit 224 has a plurality of connection ports, the master modem 226 is connected to port "0", the slave modem 228 is connected to port "1", and the port "2". A plurality of communication modems are connected to a plurality of connection ports in a manner in which a reserved communication modem is connected. The modem switching unit 224 changes the communication connection by the switching operation, and normally maintains the communication connection with the port "0".

The master modem 226 and the slave modem 228 communicate with the remote meter reading center 160 through the telephone line B connected to the terminal portion 206 of the remote meter reading master calorimeter module 200 under the control of the communication control unit 222. While communicating, the meter data, the fault status data, and the fluid pressure data collected in the remote meter reading master calorimeter module 200 are transmitted to the remote meter reading center 160.

Accordingly, the remote meter reading center 160 collects statistical data, fault status data, and fluid pressure data of each remote metering slave calorimeter module 230 transmitted from each remote metering master calorimeter module 200 to perform statistical analysis. In order to monitor the failure state of each remote metering slave calorimeter module 230, and to check the pressure of the fluid supplied to the site.

Although not shown, the remote meter reading center 160 includes a remote meter reading module, a modem unit, and a data storage unit. The remote metering module manages and operates the remote metering slave calorimeter module 230, collects various metering data from the remote metering slave calorimeter module 230, and analyzes various statistics using the collected metering data, and the slave metering remote metering. It is a software program embedded in the computer system for managing the status of the calorimeter installed in the field by monitoring the fault condition of the calorimeter module 230, setting the operating parameters of the slave calorimeter module 230 for remote meter reading, and supply pressure. The remote meter reading module connects a data call to the communication module 220 at a predetermined periodic reading time or at any time by the operator to bring the meter data temporarily stored in the communication module 220. The modem unit is configured as a dial-up modem that communicates with the remote meter reading master calorimeter module 200. The modem unit may be connected to the remote meter reading master calorimeter module 200 under the control of the remote meter reading module and receive data regarding the meter reading data, the supply pressure and the fault state of each of the remote meter reading slave calorimeter modules 230. The data storage unit stores the meter reading data, the supply pressure and the failure state received through the modem unit, and is usually composed of a hard disk of a computer system.

Next, the operation of the remote meter reading master calorimeter module 200 configured as described above will be described.

First, the remote meter reading master calorimeter module 200 having the communication module 220 receives meter reading data, fault state data, and fluid pressure data from the calorific calculator 210 of each remote metering slave calorimeter module 230. To be stored in the meter reading unit 142 of the communication module 220.

Subsequently, upon receiving a meter reading request command from the remote meter reading center 160, the remote meter reading master calorimeter module 200 checks the communication state of the master modem 226 provided in the communication module 220. The check of the communicable state checks whether the master modem 226 can normally transmit and receive transmission data. For example, the master modem 226 may transmit test data to the master modem 226 to transmit the test data. Is to check the status.

In the communication module 220, the communication control unit 222 transmits a modem command, that is, an "AT (Attention Code)" command to the master modem 226 using serial communication, and according to the returned result, the master modem 226. Figure out the communication status. In addition, the communication control unit 222 recognizes that the master modem 226 has failed even if there is no response for a predetermined time after transmitting the modem command to the master modem 226.

Upon receiving the modem command from the communication control unit 222, the master modem 226 transmits a result value of "OK" to the communication control unit 222 in normal operation, and transmits a result value of "ERROR" in abnormal operation. give.

The master modem 226 or the slave modem 228 is manufactured in the form of a chip, and the modem chip sets various optional functions using AT commands. When configuring the modem chip, the user can control the modem chip by inputting a specific character defined by each modem chip manufacturer in the "AT" command. For example, when the command is "ATDT5012885", "AT" represents "Attention Code", "D" represents "Dial", "T" represents "Tone Dial", and "5012885" represents a telephone number. Therefore, when the master modem 226 or the slave modem 228 receives the "ATDT5012885" command, the dialing command is recognized by "DT" among the commands, and accordingly, the call is made to "5012885".

The communication control unit 222 transmits test data, for example, "ATS0 = 2", to the master modem 226. Here, "AT" represents "Attention Code" and "S" represents "SRegister". Among the S registers, "S0" is defined as "Auto Answer", and "S0" can be entered from 1 to 255. When "S0 = 0", it is recognized as "Auto Answer Disabled".

Therefore, when the command "ATS0 = 2" is transmitted from the communication control unit 222, the master modem 226 stores "2" in the S register when the normal operation is performed, and the ring signal is output twice. When ringing twice, the user receives a call and transmits an "OK" signal to the communication control unit 222.

On the other hand, the master modem 226 transmits an "ERROR" signal to the communication control unit 222 in the case of a malfunction in which the command "ATS0 = 2" is not processed or an abnormal operation state in which the modem chip does not operate. When the communication control unit 222 receives the "ERROR" signal from the master modem 222, the communication control unit 222 recognizes a communication failure state of the master modem 226 as a communication failure.

3 is a diagram illustrating a communication connection between the communication control unit 222, the modem switching unit 224, and each modem.

As shown in FIG. 3, in the communication module 220, the modem switching unit 224 has a communication connection to the master modem 226. That is, the communication module 220 has a plurality of access ports, where the master modem 226 is at port "0", the slave modem 228 is at port "1", and the reserved modem is "2". A plurality of communication modems are connected to the access port in a manner of being connected to the "port number", and the modem switching unit 224 changes the communication connection by a switching operation, which normally maintains the communication connection with the port "0". .

In FIG. 3, a transmission (TX) / reception (RX) line for serial communication and three control lines SEL for controlling the modem switching unit 224 are provided between the communication control unit 222 and the modem switching unit 224. It is connected. Of course, three or more control lines may be provided. In addition, the modem switching unit 224 is connected to a telephone line (Tip Line, Delay Line) for the connection to the public switched telephone network (PSTN).

When the power is supplied to the communication module 220, the communication control unit 222 transmits a "0" control signal to the modem switching unit 224 through the control line SEL. When the modem switching unit 224 checks the control line and receives the control signal "0", the modem switching unit 224 switches the transmission / reception line to the master modem 226 to be connected.

With the communication connection of the communication module 220 set to the master modem 226 as described above, the communication control unit 222 transmits an "AT" command to the master modem 226, and also counts a predetermined time. Through the process of determining the failure state of the master modem 226.

If the communication controller 222 receives the "ERROR" signal from the master modem 226 or if there is no response for a predetermined time or more, the communication control unit 222 recognizes the operating state of the master modem 226 as a faulty state.

The communication control unit applies a "1" control signal to the modem switching unit 224 through the control line SEL when it is determined that the master modem 222 is a communication failure, so that the modem switching unit 224 receives the master modem 226. Switch the communication connection through the slave modem 228.

Therefore, the modem switching unit 224 switches the connection of the transmit / receive line connected to the port "0" from the "0" to the "1" port, and the slave modem connected to the "1" port. In operation 228, an AT command is used to determine a failure state of the slave modem 228 in the same process as that of the master modem 226. At this time, the modem switching unit 224 also switches the connection of the telephone line (Tip Line, Delay Line) when switching the communication connection.

If it is determined that the slave modem 228 is not in a fault state, the modem switching unit 224 maintains a communication connection with the slave modem 228 connected to the port "1".

The communication control unit 222 transmits the meter reading data, the failure state data, the fluid pressure data, and the like stored in the meter reading unit 142 of the communication module 220 via the slave network 228 via the communication network 150. It transmits to the remote meter reading center (160).

On the other hand, when the master modem 226 is in a normal operating state, not a communication failure, the remote meter reading master calorimeter module 200 transmits meter reading data, failure state data, and fluid pressure data to the communication network 150 through the master modem 226. It transmits to the remote meter reading center 160 via.

According to an embodiment of the present invention, in a remote meter reading system that remotely reads a calorimeter, monitors a fault condition, sets operating parameters, monitors supply pressure, and the like, the reading result data is stored in a public telephone network (PSTN) or a dedicated network. In case of communication failure in the communication modem when transmitting to the remote meter reading center, the system for remote meter reading with multiple communication modems enables smooth remote meter reading by automatically changing the communication modem to a spare modem without changing the communication line. It can be realized.

On the other hand, the communication module 220 is provided with two or more spare modems in addition to the slave modem 228, it is possible not only to duplicate but also triple or more for the communication modem. Therefore, by increasing the number of spare modems in the communication module 220 in the master meter calorimeter module 200 for remote meter reading, the maintenance period is remarkably lengthened by switching to another spare modem every time a spare modem error occurs.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas falling within the scope of the present invention should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, even if a communication modem fails when transmitting meter reading data remotely, it is not necessary to change the communication line connected to the communication modem.

In addition, since the communication connection is automatically switched to the spare modem when the main communication modem fails, only one communication line can be connected to the communication modem, and the administrator does not have to go to the place where the communication modem is installed and perform repair work. do.

In addition, even if the communication modem fails, it is automatically switched to the spare modem to continue to perform the remote meter, it is not necessary to maintain the remote metering system for a long time.

Claims (18)

A remote reading meter calorimeter device having a multi-communication modem for smooth remote meter reading by transmitting the meter reading data to a remote meter reading center automatically when the main communication modem fails. A calorie calculator configured to store and display a result calculated by calculating a fluid and a calorie consumed by a corresponding heat mechanism of each generation or heat use complex; And The main communication modem and the preliminary communication modem, and transmit "A (Attention Code)" to the main communication modem when the meter reading data, the fault status data and the fluid pressure data transmitted from the calorie calculating unit are transmitted to the remote meter reading center. After the command is transmitted, when the "ERROR" signal is received from the main communication modem, it is recognized as a fault state, the communication connection is switched to the preliminary communication modem, and the reading data, the fault state data and A communication module for transmitting the fluid pressure data to the remote meter reading center Remote meter reading calorimeter device having a multi-communication modem comprising a. The method of claim 1, wherein the communication module A calculation module connection unit for connecting in parallel with the calorie calculation unit through a multipoint bus; A meter reading unit for temporarily storing the meter data, the fault state data, and the fluid pressure data provided by each of the calorie calculating units, and storing various parameter values necessary for operation of the communication module; A communication control unit which checks a communication state of the main communication modem when a meter reading request is made at the remote meter reading center, and transfers to the preliminary communication modem when a communication failure of the main communication modem is performed to process a response to the meter reading request; And Modem switching unit for performing a transfer of the communication connection with the calorie calculating unit through the main communication modem to a communication connection through the preliminary communication modem in accordance with a control signal of the communication control unit. Remote meter reading calorimeter device having a multi-communication modem comprising a. The method of claim 2, wherein the communication control unit The meter data, the failure state data and the fluid pressure data of the plurality of calorie calculators connected to the operation module connection unit are temporarily stored in the meter reading storage unit, and when the meter reading request is requested from the remote meter reading center, the data stored in the meter reading storage unit. Transmits to the remote meter reading center through the main communication modem or the preliminary communication modem, and reports a failure status to the remote meter reading center when a major failure occurs in each of the calorie calculating units. Calorimeter device for meter reading. The method of claim 1, A temperature resistance sensor installed in a supply pipe through which the fluid is supplied and having a resistance value changed according to a temperature of the fluid flowing through the supply pipe, the supply detecting the temperature of the fluid and providing the detected supply temperature of the fluid to the calorific calculator temperature Senser; A recovery temperature installed in the reflux tube for recovering the heat-exchanged fluid, the temperature resistance sensor having a resistance value changed according to the temperature of the fluid recovered through the reflux tube, and providing a recovery temperature of the detected fluid to the calorific value calculating unit; sensor; Detects the flow of the fluid through the supply pipe, calculates the supply flow rate using the flow rate indicating the flow of the fluid and the cross-sectional area of the supply pipe, generates one flow pulse for each calculated unit flow rate, and generates the flow pulse A flow rate sensing unit provided to a calorie calculating unit; And A pressure sensor installed in the supply pipe and having a pressure sensor in which the amount of current changes in accordance with the pressure of the fluid flowing in the supply pipe, and further providing a current amount indicating a change in the detected pressure to the calorific value calculator; The calorie calculation unit detects, stores and displays the supply temperature of the fluid, the recovery temperature of the fluid, the flow rate of the fluid, and the pressure of the fluid from the supply temperature sensor, the recovery temperature sensor, the flow rate detection unit, and the pressure detection unit. A remote meter reading calorimeter device having a multiple communication modem, characterized in that for transmitting to the remote meter reading center through a communication module. The method of claim 2, After the communication control unit transmits the AT command to the main communication modem, if there is no response for more than a predetermined time, the remote meter reading calorimeter device having a multiple communication modem, characterized in that the failure of the main communication modem, characterized in that . The method of claim 2, The modem switching unit has a plurality of connection ports, The plurality of communication modems may be connected in such a manner that the main communication modem is connected to port "0", the spare communication modem is connected to port "1", and another spare communication modem is reserved to port "2". Connected to the port, The modem switching unit changes the communication connection by the switching operation, the remote meter reading calorimeter device having a multiple communication modem, characterized in that the communication connection with the port "0" is normally maintained. The method of claim 2, A multiple communication modem is connected between the communication control unit and the modem switching unit, wherein a transmission (TX) / reception (RX) line for serial communication and a plurality of control lines (SEL) for controlling the modem switching unit are connected. Having a remote meter reading calorimeter device. The method of claim 2, When the master modem receives the "ATS0 = 2" command from the communication control unit as an AT command, in the normal operation, the master modem stores "2" in the S register and if the ring signal is output twice, an "OK" signal to the communication control unit. Remote meter reading calorimeter device having a multiple communication modem, characterized in that for transmitting. The method of claim 2, The master modem transmits an "ERROR" signal to the communication controller when the master modem malfunctions because it cannot process the "ATS0 = 2" command or when the modem chip does not operate. Calorimeter device. A remote meter reading system having multiple communication modems for automatic remote meter reading by transmitting the meter reading data to the remote meter reading center automatically when the main communication modem fails. A remote meter reading slave calorimeter device for storing and displaying a result calculated by calculating the amount of fluid and heat consumed in a corresponding heat apparatus of each generation or heat use complex; The main communication modem and the preliminary communication modem are provided for detecting, storing and displaying the supply temperature of the fluid, the recovery temperature of the fluid, the flow rate of the fluid, and the pressure of the fluid, and supplying the fluid upon request for reading from the remote meter reading center. The temperature, the recovery temperature of the fluid, the flow rate of the fluid and the pressure of the fluid is transmitted through the main communication modem, if the failure of the main communication modem transfers the communication connection to the preliminary communication modem to the A master calorimeter device for remote meter reading through which the supply temperature of the fluid, the recovery temperature of the fluid, the flow rate of the fluid and the pressure of the fluid are transmitted to the remote meter reading center; And A communication network providing a transmission path for transmitting the supply temperature of the fluid, the recovery temperature of the fluid, the flow rate of the fluid and the pressure of the fluid discharged from the remote meter reading master calorimeter device to the remote meter reading center Remote meter reading system having a multi-communication modem comprising a. The method of claim 10, The remote meter reading slave calorimeter device and the remote meter reading master calorimeter device, A supply temperature sensor installed in a supply pipe through which the fluid is supplied, the temperature resistance sensor having a resistance value changed according to a temperature of the fluid flowing through the supply pipe, and detecting a temperature of the fluid through the temperature resistance sensor; A temperature resistance sensor installed in the reflux tube where the heat-exchanged fluid is recovered and having a resistance value changed according to the temperature of the fluid recovered through the reflux tube, and detecting the recovery temperature of the fluid through the temperature resistance sensor temperature Senser; Detects the flow of the fluid through the supply pipe, calculates the supply flow rate using the flow rate indicating the flow of the fluid and the cross-sectional area of the supply pipe, flow rate detection unit for detecting the flow rate by generating one flow pulse for each calculated unit flow rate ; And A pressure sensor installed in the supply pipe and having a pressure sensor to change the amount of current according to the pressure of the fluid flowing in the supply pipe, and detecting a change in pressure as the amount of current through the pressure sensor; Remote meter reading system having a multi-communication modem comprising a. The master calorimeter device for remote meter reading of claim 11 A calorific value calculator configured to detect, store, and display the supply temperature of the fluid, the recovery temperature of the fluid, the flow rate of the fluid, and the pressure of the fluid from the supply temperature sensor, the recovery temperature sensor, the flow rate sensor, and the pressure sensor. ; And Communication module for transmitting the meter reading data, the failure status data and the fluid pressure data received from the calorie calculating unit through the main communication modem or the preliminary communication modem when transmitting to the remote meter reading center. Remote meter reading system having a multi-communication modem comprising a. The method of claim 12, wherein the communication module A calculation module connection unit for connecting in parallel with the calorie calculation unit through a multipoint bus; A meter reading unit for temporarily storing the meter data, the fault state data, and the fluid pressure data provided by each of the calorie calculating units, and storing various parameter values necessary for operation of the communication module; A modem switching unit for transferring a communication connection with the calorie calculating unit through the main communication modem to a communication connection through the preliminary communication modem according to a control signal; And Upon requesting a meter reading from the remote meter reading center, an AT command is transmitted to the main communication modem. When an "ERROR" signal is received from the main communication modem, a failure state is recognized and the control signal is read. A communication control unit which transmits to a modem switching unit and transfers a communication connection of the main communication modem to the preliminary communication modem to process a response to a meter reading request. Remote meter reading system having a multi-communication modem comprising a. The method of claim 12, wherein the calorie calculation unit A display unit for displaying the supply temperature of the fluid, the recovery temperature of the fluid, the supply calorific value of the fluid, the supply flow rate of the fluid, the fault state, and the fluid pressure in numbers, letters or figures; Calculation of heat amount using the supply temperature, recovery temperature and flow rate pulses provided by the supply temperature sensor, the recovery temperature sensor and the flow rate sensing unit, and calculation of the pressure of the fluid according to the change in the amount of current provided by the pressure sensing unit. And a controller; The supply temperature, the recovery temperature, the supply calorific value, the supply flow rate, the metering data of the fluid pressure, and the fault state calculated by the operation and the control unit are stored at regular intervals, and are required for the operation of the remote metering slave calorimeter device. A storage unit for storing various parameters including ID, calorie conversion factor, upper and lower temperature values, upper and lower flow pulse values, and upper and lower current values; A power supply unit having an AC-DC converter and converting AC power into DC power to supply the remote meter reading slave calorimeter device and the communication module; A communication unit connected to the communication module in parallel and transmitting the meter reading data, the fault state data, and the fluid pressure data stored in the storage unit to the communication module through the multipoint bus under the control of the operation and the control unit. Module connection; And A terminal unit configured to mount only a terminal terminal component so that the supply temperature sensor, the recovery temperature sensor, the flow rate sensing unit, the pressure sensing unit, the operation and control unit, and the power supply unit can be connected through a wire. Remote meter reading system having a multi-communication modem comprising a. The method of claim 13, The modem switching unit has a plurality of connection ports, The plurality of communication modems may be connected in such a manner that the main communication modem is connected to port "0", the spare communication modem is connected to port "1", and another spare communication modem is reserved to port "2". Connected to the port, The modem switching unit changes the communication connection by the switching operation, the remote meter reading system having a multiple communication modem, characterized in that the communication connection with the port "0" is normally maintained. The method of claim 13, A multiple communication modem is connected between the communication control unit and the modem switching unit, wherein a transmission (TX) / reception (RX) line for serial communication and a plurality of control lines (SEL) for controlling the modem switching unit are connected. Having a remote meter reading system. The method of claim 13, When the master modem receives the "ATS0 = 2" command from the communication control unit as an AT command, in the normal operation, the master modem stores "2" in the S register and if the ring signal is output twice, an "OK" signal to the communication control unit. Remote meter reading system having a multiple communication modem, characterized in that for transmitting. The method of claim 10, And said communication network is a public telephone network (PSTN) or a dedicated network.