WO2005048163A1

WO2005048163A1 - Network system for office gateway connected with card reader

Info

Publication number: WO2005048163A1
Application number: PCT/KR2003/002457
Authority: WO
Inventors: In-Jae Kim
Original assignee: Planet Int Co., Ltd
Priority date: 2003-11-14
Filing date: 2003-11-14
Publication date: 2005-05-26
Also published as: WO2005048163A9; AU2003284719A1; AU2003284719A8

Abstract

Disclosed is a network system for an office gateway connected with a card reader. The network system includes a communication control unit connected with AC power to carry out power line communication; at least one power line communication device that is connected with AC power and has a communication module for executing power line communication and specific code information for identifying the module when the communication module transmits and receives data, the power line communication device executing remote control in response to reception of data corresponding to the specific code information; and a central control unit for recognizing the operation state of at least one power line communication device on the basis of the specific code information, transmitting result information according to the operation state to a remote place, and remotely controlling the at least one power line communication device in response to external instruction information. Robbery prevention and disaster prevention in a place of business can be remotely carried out through power line communication. Accordingly, redundant investment for the card reader and robbery-prevention/disaster-prevention system can be prevented, and facility efficiency of the robbery-prevention/disaster-prevention system through power line communication can be improved.

Description

NETWORK SYSTEM FOR OFFICE GATEWAY CONNECTED WITH CARD READER

Technical Field

The present invention relates to a card reader and, more particularly, to a network system for an office gateway connected with a card reader that has a power line communication module built therein and cooperates with a plurality of crime-prevention/disaster-prevention sensors to prevent illegal intrusion of a third party into a place of business.

Background Art

As credit cards being used are sharply increased in number along with the advent of creditable society, a place of business is necessarily equipped with a card reader. Such a card reader is one of on-line settlement systems that read a plurality of kinds of credit cards and approve a settlement according to read results. The card reader is connected with VAN through a dedicated line using a telephone line and carries out inquiry and approval of a card through connections between VAN and card companies. The card reader is a network terminal serving as one axis of an on-line settlement system and is utilized as means for inducing a reduction in cash transactions and activating on-line transactions to secure transparent trades. In addition, the use of the card reader in a place of business decreases the amount of cash reserved in the business place so that robbery of cash can be prevented. As such, the card reader is a terminal used only in a place of business, and a manager who manages the business place should be always provided with a predetermined amount of money or goods because cash transactions may be inevitably made. Accordingly, the business place is necessarily equipped with a robbery-prevention system in order to prevent loss/robbery of money and goods. The robbery-prevention system remotely executes remote control- based robbery prevention in such a manner that it transmits signals detected from a plurality of kinds of sensors installed in the business place to a corresponding anti- crime management center. However, although the robbery-prevention system is installed in the business place together with the card reader and they construct the same system managed by communication, the business place requires high cost of facility investment because the card reader and the robbery-prevention system are independently installed and operated.

Disclosure of Invention

Accordingly, the present invention has been made in view of the above problem, and it is an object of the present invention is to provide a network system for an office gateway connected with a card reader that is equipped with a power line communication module such that robbery prevention/disaster prevention in a place of business are remotely carried out through the power line communication, to thereby prevent redundant investment of the card reader and robbery-prevention/disaster-prevention system and improve a facility efficiency of the robbery- prevention/disaster-prevention system through the power line communication. To accomplish the above object, according to one aspect of the present invention, there is provided a network system for an office gateway connected with a card reader for carrying out settlement of credit cards through a communication line, comprising a communication control unit connected with AC power to carry out power line communication; at least one power line communication device that is connected with the AC power and has a communication module for executing power line communication and specific code information for identifying the module when the communication module transmits and receives data, the power line communication device executing remote control in response to reception of data corresponding to the specific code information; and a central control unit for recognizing the operation state of at least one power line communication device on the basis of the specific code information, transmitting result information according to the operation state to a remote place, and remotely controlling at least one power line communication device in response to external instruction information. Preferably, the at least one power line communication device is any one of a gas cutoff, an indoor light controller, an outlet controller, an air-conditioner, a television set, a boiler, a door controller and an electromotive curtain, and the central control unit further includes a memory that stores dial input information inputted through the communication line, remote control information corresponding to the dial input information and specific code information for identifying a target to be remotely controlled, the central control unit analyzing the dial input information to extract the remote control information corresponding to the dial input information and the specific code information from the memory and transmit them to the communication control unit. Also, the at least one power line communication device is preferably at least one robbery-prevention sensor that is connected with AC power, has a communication module for executing power line communication and specific code information for identifying the module when the communication module transmits and receives data, and generates a detection signal according to a variation in the surrounding state, and the central control unit includes a memory that stores information on at least two communication numbers that can be set through key input of the card reader, a warning message and specific code information for identifying a target to be monitored, the central control unit detecting the specific code information and the detection signal received from the communication control unit to connect with a terminal corresponding to the information about the at least two communication numbers, the central control unit providing the warning message to the terminal . Preferably, the central control unit operates in connection with a warning controller that generates a predetermined warning sound when the warning message is transmitted. preferably, the warning message is digital audio information. Also preferably, the communication control unit includes a power line coupling circuit for removing noise from AC power and converting the AC power into a voltage with a predetermined level, a line driver for detecting zero-phase of the AC voltage provided by the power line coupling circuit and transmitting the specific code information and remote control information when the zero- phase AC voltage is detected, and a modulator for modulating the specific code information and remote control information. The communication control unit includes a demodulator for receiving and demodulating identification code information of the at least one power line communication device and status information of at least one power line communication device. The memory possesses text information corresponding to the identification code information and status information and predetermined communication number information for connection of a manager. The central control unit transmits the text information to a terminal corresponding to the communication number information. According to an another aspect of the present invention, there is also provided a network system for an office gateway connected with a card reader for carrying out settlement of credit cards through a communication line, comprising at least one RF communication device having a communication module for RF one-way communication and specific code information for identifying the module when the communication module transmits and receives data, the RF communication device radio-transmitting the specific code information through the communication module when a variation in a set environment is detected; and a central control unit including a communication control unit for demodulating the specific code information to receive operation state information of the at least one RF communication device, the central control unit transmitting message information corresponding to the operation state information of the at least one RF communication device, recognized by the communication control unit, to a communication terminal located at a predetermined remote place. Preferably, the at least one RF communication device is at least one robbery-prevention sensor for generating a detection signal according to a variation in the surrounding state . The central control unit includes a memory that stores information on at least two communication numbers that can be set through key input of the card reader, a warning message and specific code information for identifying a target to be monitored. The central control unit detects the specific code information received from the communication control unit to carry out communication connection with the communication terminal corresponding to the information about the at least two communication numbers. The central control unit provides the warning message to the terminal .

Brief Description of the Drawings

Further objects and advantages of the invention can be more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. 1 is a perspective view of a card reader capable of carrying out power line communication according to the present invention; FIG. 2 is a block diagram for explaining the principal functions of the card reader capable of carrying out power line communication according to the present invention; and FIG. 3 shows the composition of a network system of the card .reader capable of carrying out power line communication according to the present invention.

Best Mode for Carrying Out the Invention

The network system for an office gateway connected with a card reader according to the present invention will now be described in detail in connection with preferred embodiments with reference to the accompanying drawings. While the office gateway is limited to robbery prevention/disaster prevention in embodiments of the present invention, it is exemplary and does not restrict the scope and spirit of the present invention. FIG. 1 is a perspective view of a card reader capable of carrying out power line communication according to the present invention. Referring to FIG. 1, the card reader 101 for carrying out communication using electric power for home use includes a display panel 105 for displaying character or graphic messages according to a result of approval of settlement of a credit card and robbery- prevention/disaster-prevention, a key input unit 107 for operating settlement of credit cards and setting the initial state of a robbery-prevention system, a power line communication line 111 that is connected to one side of a housing of the card reader 101 capable of carrying out power line communication to receive AC required for power line communication, and a communication line 109 used for connection with VAN for the purpose of settling credit cards. A card reading part 103 recognizes a credit card for settlement of the card. FIG. 2 is a block diagram for explaining the principal functions of the card reader capable of carrying out power line communication according to the present invention. Referring to FIG. 2, the card reader 101 includes a communication control unit 227 connected with AC power to carry out power line communication, and a memory 211 having dial input information inputted through the communication line 109 and remote control information corresponding to the dial input information and storing information on at least two communication numbers that can be set through key input of the card reader and a warning message. The card reader 101 further includes a central control unit 221 that analyzes the dial input information and extracts remote control information corresponding to the dial input information and specific code information from the memory 211 to transmit them to the communication control unit 227 so as to perform a disaster-prevention function. In addition, the central control unit detects specific code information and detection signals inputted from the communication control unit 227 to connect with a terminal corresponding to the information on at least two communication numbers, and provides the warning message to the terminal to carry out a robbery-prevention function. The disaster-prevention and robbery-prevention functions of the central control unit 221 are executed according to a key-setting operation of the key input unit 215. If required, the disaster-prevention and robbery- prevention functions can be simultaneously performed. The communication control unit 227 is composed of a power line coupling circuit 201 for removing noise from AC power and converting it into a voltage with a predetermined level, a line driver 203 for detecting zero-phase of AC voltage provided by the power line coupling circuit 201 and transmitting/receiving data when the zero-phase AC voltage is detected,, a demodulator 205 and a modulator 209 for demodulating and modulating input/output data. The communication control unit 227 is used in connection with RF communication devices having a radio robbery-prevention function. Here, the RF communication devices provides their specific code information as predetermined analog frequencies when intrusion is detected. Each of the RF communication device is connected to an RF receiver 231 for receiving the analog frequencies, an RF demodulator 233 for extracting the specific code information from the RF receiver 231, a signal shaping unit 235 for shaping the specific code information extracted by the RF demodulator 233, and an A/D converter 237 for converting the shaped specific code information into a digital signal. The central control unit 221 is connected with a warning controller 223 for creating a predetermined warning sound when a warning according to robbery- prevention/disaster-prevention is generated. Detailed explanations for a print module 213 and a card reader module 217 are omitted because they are intrinsic functions of the card reader 101. FIG. 3 illustrates the composition of a network system of the card reader capable of carrying out power line communication according to the present invention. While FIG. 3 shows both of power line communication and RF communication, power line communication is explained as the principal function. Referring to FIG. 3, a power line 309 is an AC power line connected with a plurality of power line communication home appliances 301, robbery-prevention sensors 303, a radio robbery-prevention sensor 313 for sensing intrusion through RF communication. The power line 309^" is connected with the card reader 101 through the power line communication line 111. The communication line 109 of the card reader 101 is coupled to a telephone office network 305 to be connected with a VAN server 311 for approval of settlement of credit cards or a manager terminal 307. The power line communication home appliances 301 may include a gas cutoff, an indoor light controller, a television set, an outlet controller, an air-conditioner, a boiler, a door controller, an electromotive curtain and so on. Each of the power line communication home appliances 301 is connected with AC power for power line communication control and has a communication module used for power line communication and specific code information for identifying a module when the communication module transmits/receives data. The power line communication home appliance accepts the remote control information when it receives data corresponding to the specific code and performs a control operation corresponding to the remote control information. Each of the robbery-prevention sensors 303 is connected to AC power and has a communication module used for power line communication and specific code information for identifying a module when the communication module transmits data. The robbery-prevention sensor 303 provides a detection signal according to a variation in the surrounding state to the communication control unit 227 of the card reader 101. Here, in the case where the communication control unit 227 is used as an RF communication module, the communication module of the radio robbery-prevention sensor 313 is a transmission module capable of carrying out analog radio communication. A detection signal and specific code information are modulated into a predetermined frequency and transmitted through the transmission module.

Claims

The operation of the network system for an office •gateway connected with a card reader is explained below. A manager of a place of business connects the power line communication line of the card reader 101 capable of carrying out power line communication to AC power and couples the communication line 109 to a telephone line so as to complete installation of the card reader 101. Then, the manager arranges a plurality of power line communication home appliances 301 and robbery-prevention sensors 303. Here, each of the power line communication home appliances 301 and robbery-prevention sensors 303 has its specific code information, and the manager inputs this specific code information through the key input unit 107 of the card reader 101. Communication number information can be terminal number information of the manager, to which a warning message is sent in case of emergency and, if required, it can be number information of a robbery- prevention sensor or a police office. When the card reader 101 is initially installed, remote control information for remotely controlling the power line communication home appliances 301 is provided in advance. This remote control information is stored in the memory 211. Preferably, the remote control information is composed of key button signals of the manager's terminal and the specific code information is made of numerical information. In the case where the specific code information of a gas cutoff is "028" and, among -the remote control information provided in advance, remote control information corresponding to ON/OFF is "20/67", for instance, control information such as "*028#67*" is transmitted to the card reader 101 through the key buttons of the manager's terminal 307 when the gas cutoff needs to be turned off by the manager. In this manner, the gas cutoff that carries out power line communication with the card reader 101 is controlled. Here, λ*' and #' are identifiers for safely performing remote control of home appliances . The control information is transmitted from the manager's terminal 307 to be inputted to the card reader 101 via the telephone office network 305. The central control unit 221 of the card reader 101 analyzes the information inputted through a communication port 225 and recognizes it as a signal for remote control. Specifically, the central control unit 221 detects input of the identifier λ *' corresponding to remote control and receives the code 028' and *#' following the identifier **' to judge whether or not the specific code information is inputted according to a normal code input rule. Then, the central control unit 221 enables the memory 211 to be provided with specific code information previously stored in the memory. The central control unit 211 recognizes a home appliance 301 to be remotely controlled on the basis of the specific code information provided by the memory 211 and, when the specific code information is not set to the memory 211, transmits an error message to the manager's terminal 307. Then, the central control unit 221 receives the code Λ 67' that follows the identifier λ#' to judge whether or not code information corresponding to the identifier '#' is stored in the memory 211 and analyzes remote control information corresponding to the code information according to the judgement result. The central control unit 221 transmits the specific code information and remote control information to a communication controller 207 of the communication control unit 227. The communication controller 207 encodes the specific code information and remote control information according to a predetermined communication protocol. In addition, the communication controller 207 enables the modulator 209 to modulate the specific code information and remote control information into predetermined frequency bands and provide them to the line driver 203. The line driver 203 detects a zero voltage state from the power line coupling circuit 201 and transmits the specific code information and remote control information to the power line 309 when the zero voltage state is detected. The specific code information and remote control information are delivered to the multiple power line communication home appliances 301 through the power line 309. Here, each of the power line communication home appliances 301 and robbery-prevention sensors 303 has its communication module and specific code information. Each communication module judges whether or not the specific code information inputted through the power line 309 is identical to specific code information recognizable by the communication module. In the case where the specific code information inputted through the power line 309 is identical to the specific code information recognizable by the communication module, the power line communication home appliance 301 connected with the communication module, gas cutoff, for example, is turned on. Here, the communication module informs the central control unit 221 that it has received the specific code information to carry out hand shaking between the communication module and the central control unit 221. When the central control unit 221 recognizes completion of hand shaking, it transmits the remote control information to the corresponding communication module through the communication control = unit 227 to turn off the gas cutoff . While the power line communication home appliances 301 are remotely controlled through the communication line 109 in this embodiment of the present invention, two-way remote control as well as one-way remote control can be carried out. That is, it is possible to encode the operation result or current state information of each of the power line communication home appliances 301 and inform the manager's terminal of it. Specifically, the central control unit 221 enables the communication modules of the power line communication home appliance 301 at a specific time interval to . receive current state information, for instance, the opened/closed state of the gas cutoff and the current operation state of a home appliance, and store it in the memory 211. The manager terminal 307 connects with the card reader 101 to recognize the operation state of each of the power line communication home appliances 301. The disaster-prevention function of the card reader capable of carrying out power line communication has been described above. Now, the robbery-prevention function of the card reader according to the present invention is explained. The plurality of robbery-prevention sensors 303 or radio robbery-prevention sensor 313 are installed at a plurality of points of a place of business. Each of the robbery-prevention sensor 303 or radio robbery-prevention sensor 313 has its communication module and specific code information. The same communication module and specific code information can be provided to the same kind of robbery-prevention sensors. For instance, magnetic sensors that are set on a plurality of windows to sense opening of the windows can be provided with the same communication module and specific code so as to reduce the number of communication bits. The memory 211 stores communication number information and a warning message for the robbery-prevention function of the card reader and holds specific code information required for communication with each robbery-prevention sensor 303. As described above, the communication number information is a receiving number used for informing the manager terminal, a police station or 119 of emergency, and the warning message is transmitted to the communication number. Accordingly, the warning message can be digital audio information or text information. It is digital audio information in this embodiment. The multiple robbery-prevention sensors 303 also carry out power line communication. For this, the communication module of each robbery-prevention sensor 303 is connected with the power line 309. When the card reader 101 is set to its robbery-prevention mode, the central control unit 221 checks the robbery-prevention sensors 303 at a predetermined time interval to detect whether or not each sensor is in its normal state. The radio robbery-prevention sensor 313 performs RF radio communication and transmits detected information to the RF receiver 231 of the card reader 101 through RF. The RF receiver 231 receives a signal of a predetermined frequency band and the demodulator 233 extracts specific code information modulated into the frequency band from the signal. The signal shaping unit 235 shapes the specific code information. The A/D converter 237 converts the shaped signal into a digital signal and sends the digital signal to the communication controller 207. The communication controller 207 receives the specific code information to recognize external intrusion or illegal intrusion into a predetermined position. When -one of the plurality of robbery-prevention sensors 303 and radio robbery-prevention sensor 313 operates according to illegal intrusion into a place of business, the communication module of the corresponding robbery-prevention sensor outputs a signal detected from the sensor together with its specific code information. The detected signal can be a human body detection signal according to thermal infrared rays, a switching signal caused by opening or closing of a door without permission or a temperature detection signal according to a variation in the indoor temperature . The communication module transmits the specific code information and the detected signal to the communication control unit 227 on the basis of a predetermined power line communication protocol or RF radio communication protocol . The communication control unit 227 provides the specific code information and detected signal received from the demodulator 205 or RF demodulator 233 to the central control unit 221 as coded information. The central control unit 221 judges whether or not data corresponding to the specific code information exists in the memory 211. When the central control unit judges that the specific code information is stored in the memory 211, it receives the detected signal. Respective receiving of the detected signal and specific code information reduces an error rate of the corresponding communication module. In the case where the communication module transmits the specific code information and provides the detected signal, the central control unit 221 recognizes it as the normal operation of the communication module and intrusion from the outside. Accordingly, " when only one of the specific code information and detected signal is inputted to the central control unit 221, the central control unit recognizes it as an error in the communication module. The central control unit 211 recognizes intrusion from the outside only when both of the specific code information and detected signal are inputted thereto. In the meantime, in the case where the central control unit 221 recognizes intrusion, it fetches communication number information previously stored in the memory 211 and enables the communication port 225 to carry out communication connection with the manager terminal 307 or a police office corresponding to the communication number information. When the central control unit 221 recognizes that a call corresponding to the communication number information is connected, it receives the warning message stored in the memory 211. The warning message is digital audio information. The central control unit 221 converts the audio information into an analog signal to provide it to the communication port 225. Accordingly, a message about a dangerous situation or illegal intrusion can be provided to the manager terminal 307 or a communication terminal located at a specific place corresponding to the communication number information. Furthermore, the central control unit 221 operates the warning controller 223 to generate a warning sound in the place of business so as to send out a warning to an illegal intruder . While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims. It is to' be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope _ and spirit of the present invention.Industrial Applicability As described above, the present invention provides a network system for an office gateway connected with a card reader. The card reader includes the communication control unit for power line communication. A plurality of power line communication home appliances and robbery-prevention sensors connected to the communication control unit are coupled with AC power. Control information of the power line communication home appliances for robbery prevention and disaster prevention or communication number information for robbery prevention are stored in the internal memory of the card reader. The central control unit remotely controls the power line communication home appliances and gives a warning using signals detected by the robbery-prevention sensors so that robbery prevention and disaster prevention in a place of business can be remotely executed through power line communication. Therefore, redundant investment for the card reader and robbery-prevention/disaster- prevention system can be prevented. Furthermore, facility efficiency of the robbery-prevention/disaster-prevention system through power line communication can be improved. What Is Claimed Is:

1. A network system for an office gateway connected with a card reader for carrying out settlement of credit cards through a communication line, comprising: at least one power line communication device that is connected with AC power and has a communication module for executing power line communication and specific code information for identifying the module when the communication module transmits and receives data, the power line communication device executing remote control in response to reception of data corresponding to the specific code information; and a central control unit connected with the AC power to perform power line communication, the central control unit including a communication control unit for recognizing the operation state of at least one power line communication device on the basis of the specific code information, the central control unit transmitting result information according to the operation state of at least one power line communication device, recognized by the communication control unit, to a remote place, the central control unit remotely controlling at least one power line communication device by the specific code information in response to external instruction information.

2. The network system as claimed in claim 1, wherein the at least one power line communication device is any one of a gas cutoff, an indoor light controller, an outlet controller, an air-conditioner, a television set, a boiler, a door controller and an electromotive curtain, and the central control unit further includes a memory that stores dial input information inputted through the communication line, remote control information corresponding to the dial input information and specific code information for identifying a target to be remotely controlled, the central control unit analyzing the dial input information to extract the remote control information corresponding to the dial input information and the specific code information from the memory and transmit them to the communication control unit.

3. The network system as claimed in claim 1, wherein the at least one power line communication device is at least one robbery-prevention sensor that is connected with AC power, has a communication module for executing power line communication and specific code information for identifying the module when the communication module transmits and receives data, and generates a detection signal according to a variation in the surrounding state, and the central control unit includes a memory that stores information on at least two communication numbers that can be set through key input of the card reader, a warning message and specific code information for identifying a target to be monitored, the central control unit detecting the specific code information and the detection signal received from the communication control unit to connect with a terminal corresponding to the information about the at least two communication numbers, the central control unit providing the warning message to the terminal .

4. The network system as claimed in claim 3, wherein the central control unit operates in connection with a warning controller that generates a predetermined warning sound when the warning message is transmitted.

5. The network system as claimed in claim 3 or 4, wherein the warning message is digital audio information.

6. The network system as claimed in claim 1, wherein the communication control unit includes a power line coupling circuit for removing noise from AC power and converting the AC power into a voltage with a predetermined level, a line driver for detecting zero-phase of the AC voltage provided by the power line coupling circuit and transmitting the specific code information and remote control information when the zero-phase AC voltage is detected, and a modulator for modulating the specific code information and remote control information.

7. The network system as claimed in claim 1, wherein the communication control unit includes a demodulator for receiving and demodulating identification code information of at least one power line communication device and status information of the at least one power line communication device, the memory possesses text information corresponding to the identification code information and status information and predetermined communication number information for connection of a manager, and the central control unit transmits the text information to a terminal corresponding to the communication number information.

8. A network system for an office gateway connected with a card reader for carrying out settlement of credit cards through a communication line, comprising: at least one RF communication device having a communication module for RF one-way communication and specific code information for identifying the module when the communication module transmits and receives data, the RF communication device radio-transmitting the specific code information through the communication module when a variation in a set environment is detected; and a central control unit including a communication control unit for demodulating the specific code information to receive operation state information of the at least one RF communication device, the central control unit transmitting message information corresponding to the operation state information of the at least one RF communication device, recognized by the communication control unit, to a communication terminal located at a predetermined remote place .

9. The network system as claimed in claim 8, wherein the at least one RF communication device is at least one robbery-prevention sensor for generating a detection signal according to a variation in the surrounding state, and the central control unit includes a memory that stores information on at least two communication numbers that can be set through key input of the card reader, a warning message and specific code information for identifying a target to be monitored, the central control unit detecting the specific code information received from the communication control unit to carry out communication connection with the communication terminal corresponding to the information about the at least two communication numbers, the central control unit providing the warning message to the terminal .

10. The network system as claimed in claim 8, wherein the central control unit operates in connection with a warning controller that generates a predetermined warning sound when the warning message is transmitted.

11. The network system as claimed in claim 8 or 9, wherein the warning message is digital audio information.

12. A network system for an office gateway connected with a card reader for carrying out settlement of credit cards through a communication line, comprising: at least one power line communication device that is connected with AC power and has a communication module for executing power line communication and specific code information for identifying the module when the communication module transmits and receives data, the power line communication device executing remote control in response to reception of data corresponding to the specific code information; at least one RF communication device having a communication module for RF one-way communication and specific code information for identifying the module when the communication module transmits and receives data, the RF communication device radio-transmitting the specific code information through the communication module when a variation in a set environment is detected; a central control unit connected with the AC power to perform power line communication, the central control unit including a communication control unit for recognizing the operation state of the at least one power line communication device on the basis of the- specific code information, the central control unit transmitting result information according to the operation state of the at least one power line communication device, recognized by the communication control unit, to a remote place, the central control unit remotely controlling the at least one power line communication device by • the specific code information in response to external instruction information, the central control unit including a communication control unit for demodulating the specific code information received from the RF communication device by radio to receive operation state information of the at least one RF communication device, the central control unit transmitting message information corresponding to the operation state information of the at least one RF communication device, recognized by the communication control unit, to a communication terminal located at a predetermined remote place .

13. The network system as claimed in claim 12, wherein the at least one power line communication device is any one of a gas cutoff, an indoor light controller, an outlet controller, an air-conditioner, a television set, a boiler, a door controller and an electromotive curtain, and the central control unit further includes a memory that stores dial input information inputted through the communication line, remote control information corresponding to the dial input information and specific code information for identifying a target to be remotely controlled, the central control unit analyzing the dial input information to extract the remote control information corresponding to the dial input information and the specific code information from the memory and transmit them to the communication control unit.

14. The network system as claimed in claim 12, wherein the at least one RF communication device is at least one robbery-prevention sensor for generating a detect signal according to a variation in the surrounding state, and the central control unit includes a memory that stores information on at least two communication numbers that can be set through key input of the card reader, a warning message and specific code information for identifying a target to be monitored, the central control unit detecting the specific code information received from the communication control unit to carry out communication connection with the communication terminal corresponding to the information about the at least two communication numbers, the central control unit providing the warning message to the terminal .