JP4315862B2 - Integrated automatic management system and terminal device thereof - Google Patents

Description

  The present invention transmits meter reading data of a measuring instrument that measures different types of meter reading targets such as electric power, gas, and water, from the terminal device to the center device, and monitors and controls different types of monitoring control targets. The present invention relates to a suitable integrated automatic management system and its terminal device.

  2. Description of the Related Art Conventionally, an automatic meter reading system that performs meter reading using a single terminal device for a plurality of metering devices specific to metering targets such as electric power, gas, or water is known (for example, Patent Document 1). Also, an integrated automatic meter reading system has been conventionally known in which a plurality of metering devices specific to metering targets such as electric power, gas, and water are measured with a single terminal device (for example, Patent Documents). 2). In this way, in the integrated automatic meter reading system that can be used in common by different businesses such as electric power, gas, and water, security regarding meter reading data transmission is maintained between businesses that handle different types of meter reading objects. It becomes an important requirement. An image of an example of an integrated automatic meter reading system according to the prior art is shown in FIG. Here, each business operator, for example, an electric power company (including a sales office), a gas company (including a sales office), and a water department (including a sales office) separately host computers 31 to 33 for automatic meter reading and a center side network control. Center devices 37 to 39 composed of units 34 to 36 are installed, each connected to the terminal device 40 through an analog public line (no-ringing line), and meter reading data from each of the electricity, gas, and water meter 41-43. To collect. The terminal device 40 is connected in parallel with the telephone 44. The analog public line includes call-side exchanges 45 to 47 and a call-side exchange 49 having a no-ringing trunk 48.

The transmission specifications of the measuring instruments 41 to 43 are basically not disclosed except for those concerned from the viewpoint of tampering prevention, etc. Here, the terminal device 40 only performs modulation / demodulation of the analog-modulated signal, Since the data is transmitted to the measuring instruments 41 to 43 as they are, the terminal device 40 does not need to recognize the message specifications of the measuring instruments 41 to 43 in advance. In other words, the telegram specifications of the measuring instruments 41 to 43 can be constructed without being disclosed to not only other operators but also the manufacturer of the terminal device 40.
Japanese Patent Laid-Open No. 5-260569 Japanese Patent Laid-Open No. 9-247282

  Most of the transmission / reception interface circuits between the measuring instruments 41 to 43 and the terminal device 40 are two-wire systems in which electrical insulation is most simplified. Since two-wire half-duplex communication is performed, there is a tendency for restrictions on transmission control to increase, and communication with the measuring instruments 41 to 43 is not limited to telegrams, but transmission specifications such as procedures and timing are defined in detail. ing. For example, even if the command message to the measuring instruments 41 to 43 is correctly transmitted at a predetermined speed, a response is obtained if the mark signal (keep the transmission terminal at a high level) preceding the message is not a predetermined length. Some measuring instruments do not exist.

  In the system configuration of FIG. 14, the transmission line is an analog public line (no-ringing line). However, in this system, the telephone line of the customer where the measuring instruments 41 to 43 are installed is borrowed when communicating. Therefore, this system form cannot be applied when the customer is an ISDN line. If the analog public line is replaced with a PHS public line, etc., since it is a digital line, the message itself is transmitted, but it is difficult to transmit the timing (transmission specifications) such as the length of the mark signal that accompanies it. Become.

  Further, in the system configuration of FIG. 14, each terminal device 40 is dialed and accessed via an analog public line. However, as shown in FIG. 15, the terminal device side is hierarchized by combining several transmission media. It may be a system. Hierarchization in this way is an effective means for improving the efficiency of the system. In this system, meter reading data is aggregated from the child terminal devices 51a, 51b... To the parent terminal device 50 connected to the public line, and data can be collected from the public line at once. The example of FIG. 15 is a digital line because it is a PHS public line including the ISDN public network 52, the PHS public network 53, and the cell station 54. However, even if it is an analog line, the multi-stage transmission configuration shown in FIG. In this case, although the message itself is transmitted, it is difficult to transmit the transmission timing. In FIG. 15, reference numerals 41a to 41c denote electric energy meters, 42a to 42c denote gas meters, 43a to 43c denote water meters, and 55 to 57 denote terminal adapters.

  Therefore, if a program in which the transmission specifications with the weighing instrument are input in advance is installed in the terminal device, the transmission specifications are often different even in the same type of weighing instrument depending on the region, resulting in a system with no versatility. It was. In addition, since each business operator having jurisdiction over the measuring instrument must disclose the transmission specifications of the measuring instrument to the terminal device manufacturer, there is also a security problem.

  On the other hand, paying attention to the hardware of the terminal device, the interface circuit with each measuring instrument has a common point such as a two-wire system and electrical insulation, but there are some differences in the system itself. Requires a different interface circuit. For example, city gas meters and propane gas meters differ not only in transmission specifications but also in meter interface circuit configurations. That is, there is a problem that it is difficult to achieve generalization in terms of the hardware configuration of the terminal device.

(Object of invention)
An object of the present invention is to provide a combined automatic management system capable of improving versatility and efficiency while maintaining security related to data transmission between operators handling different types of management targets, and a terminal device thereof. .

  In order to achieve the above object, the present invention according to claim 1 is provided between one terminal device to which a plurality of different types of management targets are connected and a center device installed for each of the same type of management targets. In the integrated automatic management system for transmitting data respectively, an interface circuit corresponding to the number of management targets connected to the terminal device is provided, and a script specific to the management target for controlling the interface circuit is sent from the center device to the terminal The data is transmitted to a device, and the terminal device controls the interface circuit according to the script so that data is transmitted to the management target or read from the management target.

  Further, the present invention according to claim 2 is a terminal device in which a plurality of different types of management targets are connected and each transmits data to and from a center device installed for each of the same type of management targets. Having an interface circuit according to the number of management objects, receiving a script specific to the management object for controlling the interface circuit from the center device, and transmitting the data to the management object by controlling the interface circuit according to the script; Or it is made to read from the management object.

  According to a third aspect of the present invention, in the terminal device according to the second aspect, the interface circuit can be replaced.

  According to the present invention, an interface circuit corresponding to the number of management targets connected to the terminal device is provided, and the terminal device is configured to execute the script describing the transmission specification specific to the management target transmitted from a center device to the terminal device. By controlling the interface circuit and transmitting data to the management target or reading data from the management target, it is possible to improve versatility and efficiency while maintaining security related to data transmission between operators handling different types of management targets. be able to. And the cost of automatic management can be reduced.

  The best mode for carrying out the present invention is as described in Examples described later.

  The present invention is preferably applied to, for example, a combined automatic meter reading system. The outline of the combined automatic meter reading system according to the present invention is as follows: one terminal device in which each of the center devices installed for each operator, that is, for each of different types of meter-reading objects, is connected to a plurality of measuring instruments. It sends a command to the target measuring instrument and performs meter reading. The system configuration may be a method of directly accessing the terminal device 40 via a public line as shown in FIG. 14, or a hierarchy in which a command is transmitted via the parent terminal device 50 connected to the public line as shown in FIG. It may be a system. The case where the system configuration of an embodiment of the present invention is the hierarchical system of FIG. 15 will be described below.

  First, FIG. 1 shows a block diagram of a terminal device in the present embodiment. The terminal device 1 (common to the parent terminal device 50, the child terminal devices 51a, 51b...) Has three measuring instrument interface terminals 2a, 2b, 2c (each two-wire type), and an electric energy meter, a gas meter, and a water meter. Connected. The internal meter interface circuits 3a, 3b, 3c are configured to be replaceable, and are respectively for electric energy, gas, and water. Further, the terminal device 1 is electrically insulated in each of the three areas of the first block 1a, the second block 1b, and the third block 1c as partitioned by a dotted line in FIG. In the first block 1 a, the AC power supply voltage input to the AC power supply input terminal 4 is applied to the primary side of the transformers 5 and 6. In the second block 1b, the power supply circuit 7 generates a constant power supply voltage from the secondary side output of the transformer 5, and supplies it to each part of the second block 1b. The control unit 8 composed of a microcomputer or the like controls transmission / reception with the PHS modem 9, control / monitoring of the measuring instrument interface circuits 3a to 3c, and energization / disconnection of the relay 11 by the transistor 10. The PHS modem 9 performs wireless communication between a parent / child terminal device or between a terminal device and a center device in a PHS transceiver mode. In the case of wired communication, a communication line interface terminal may be provided in the second block 1b, and the communication modem may be connected to the communication line via the communication line interface terminal. In the third block 1c, the power supply circuit 12 generates a constant power supply voltage by the secondary side output of the transformer 6, and supplies it to each part of the third block 1c through the contact of the relay 11. That is, the power supply from the power supply circuit 12 is on / off controlled by the control unit 8.

  The power source may be a battery, but in that case (the area of the first block 1a disappears), two batteries are mounted, and the two areas of the second block 1b and the third block 1c are electrically insulated. Like that.

  FIG. 2 shows a basic configuration of the measuring instrument interface circuit 3a (the same applies to 3b and 3c). In the transmission photocoupler 13 and the reception photocoupler 14, the measuring instrument connection portion 15c (left side in FIG. 2) and the internal circuit connection portion 15b (right side in FIG. 2) are electrically insulated. The measuring instrument connecting portion 15c has a total of four external terminals: an I / F power input terminal 16, an I / F power GND terminal 17, and a two-wire measuring instrument interface terminal 2a (2b, 2c). The internal circuit connection portion 15b has a total of four external terminals including an internal power supply input terminal 18, an internal power supply GND terminal 19, a transmission terminal TXD, and a reception terminal RXD. By making the measuring instrument interface circuit 3a (3b, 3c) with these eight external terminals interchangeable, it is possible to handle various combinations of two-wire measuring instruments and to construct a general-purpose automatic meter reading system. it can.

  As the structure of the replaceable measuring instrument interface circuit 3a (3b, 3c), for example, as shown in FIG. 3, the transmission photocoupler 13 and the reception photocoupler 14 are mounted on the mini-board 20, and the mini-board is mounted. The two sets of 4P connectors 21 formed on 20 are inserted into the connectors on the main board, so that electrical connection and mechanical fixing may be performed.

  The electrical conditions of the measuring instrument interface circuit 3a (3b, 3c) are roughly classified into two types: those defined by voltage and those defined by current. FIG. 4 shows an example of an equivalent circuit of a measuring instrument interface circuit defined by voltage and an equivalent circuit of a measuring instrument side connection circuit. 22 is an equivalent circuit of a measuring instrument interface circuit defined by voltage, and 23 is an equivalent circuit of a measuring instrument side connection circuit. For example, when the inter-terminal voltage V is 3V to 6V, it is specified to be high level, and when it is 0.3V or less, it is specified to be low level, and the resistors R2 and R3 are 100 kΩ or more and the resistor R4 is 1 kΩ. It is prescribed. When performing meter reading, the terminal device 1 closes the switch SW1, sets the inter-terminal voltage V to a high level for a predetermined time, and prompts the meter to prepare for reception. Then, the terminal device 1 opens and closes the switch SW1, changes the inter-terminal voltage V, and transmits a meter reading command message. Then, the switch SW1 is opened and the inter-terminal voltage V is set to a low level for a predetermined time to prompt the weighing instrument to prepare for transmission. Then, the terminal device 1 closes the switch SW1 and prompts transmission itself. The measuring instrument opens and closes the switch SW2, changes the voltage V between the terminals, and transmits a meter reading response message. A specific circuit configuration example of the measuring instrument interface circuit 3a (3b, 3c) defined by such a voltage is as shown in FIG. The switch SW1 in the equivalent circuit of FIG. 4 corresponds to the transistor Tr2 of FIG.

  FIG. 6 shows an example of an equivalent circuit of a measuring instrument interface circuit defined by current and an equivalent circuit of a measuring instrument side connection circuit. Reference numeral 24 is an equivalent circuit of the measuring instrument interface circuit defined by the current, and 25 is an equivalent circuit of the measuring instrument side connection circuit. Reference numeral 26 denotes a receiving photocoupler of the measuring instrument, and 27 denotes a transmitting photocoupler of the measuring instrument. For example, the closed loop current I is defined to be a high level when it is 3 mA to 6 mA, and a low level when it is 0.3 mA or less. When performing meter reading, the terminal device 1 turns on the transmission photocoupler 13 and causes the current I to flow through the closed loop for a predetermined time (the transmission photocoupler 27 on the meter side is normally on). Urge the weighing instrument to prepare for reception. Thereafter, the meter reading command message is transmitted by turning on / off the transmission photocoupler 13. After transmission, the transmission photocoupler 13 is kept on to prompt the meter to transmit. The measuring instrument transmits a meter reading response message by turning on / off the transmission photocoupler 27. A specific circuit configuration example of the measuring instrument interface circuit 3a (3b, 3c) defined by such a current is as shown in FIG.

  In this embodiment, in one group consisting of the parent terminal device 50 and a plurality of child terminal devices 51a, 51b,... Registered in the system configuration of FIG. Intends to connect the same type of measuring instrument. Here, it is assumed that a power meter is connected to the meter interface terminal 2a, a gas meter is connected to the meter interface terminal 2b, and a water meter is connected to the meter interface terminal 2c.

  Since the transmission / reception interface circuit between the measuring instrument and the terminal device for meter reading performs half-duplex communication with a two-wire system, there is a tendency that restrictions for transmission control increase. For this reason, not only telegrams but also transmission specifications such as procedures and timing are defined in detail for communication with measuring instruments. For example, even if a command message to the measuring instrument is correctly transmitted at a predetermined speed, if the mark signal prior to the message (the transmission terminal is kept at a high level) is not a predetermined length, a response is not obtained. There is also a bowl. In the case of a multi-stage transmission system configuration as shown in FIG. 15, the message itself is transmitted, but it is difficult to transmit the transmission timing. Therefore, in the present embodiment, each business operator provides a script (communication setting, telegram) for the terminal device to control and monitor the measuring instrument interface circuits 3a to 3c including not only the telegram but also the procedure and timing. , The operation procedure determined by the terminal device for transmission specifications such as transmission procedure and transmission timing) is transmitted to perform meter reading.

  For example, when an electric power company performs meter reading, first, script registration of the measuring instrument connected to the measuring instrument interface terminal 2a is performed in the parent terminal device 50 (FIG. 15). The host computer 31 is connected to the parent terminal device 50 through a PHS public line, and a password for the measuring instrument interface terminal 2a is transmitted to establish a data link. Then, the parent terminal device 50 registers a script for the measuring instrument interface terminal 2a. When the script is registered in the parent terminal device 50, the parent terminal device 50 transmits the command to the subordinate child terminal devices 51a, 51b,... At a set interval (for example, once a day). Receiving the script, the child terminal devices 51a, 51b,... Decode and execute the script contents, and return the execution result to the parent terminal device 50. The host computer 31 of the electric power company connects to the parent terminal device 50 at an arbitrary time, establishes a data link, and executes a script execution result for the measuring instrument interface terminal 2a of each of the parent terminal device 50 and the child terminal devices 51a, 51b. (Measuring meter reading result) can be read. The method in which the gas company performs meter reading of the measuring instrument interface terminal 2b and the method in which the water station performs meter reading of the measuring instrument interface terminal 2c are the same.

  When the host computer 31 registers a script in the parent terminal device 50, after the data link is established, the “A. command” shown in the script registration message format of FIG. 8 is transmitted to the parent terminal device 50. STX and ETX are communication control codes, and BCC is a block check code for error detection. “Data length” is a code indicating the length of the entire message, “command mode” is a code designating a mode such as meter reading mode, time change mode, etc., “script execution setting time” is every hour, every 3 hours, 6 A code for setting any script execution time every hour, every 12 hours, or every 24 hours, “meter reading confirmation date” is a code for setting any date from 01 to 31. The normal script execution result is overwritten with the latest value, but the first script execution result on the fixed date is retained until it is overwritten with the first script execution result on the next fixed date. “Communication speed” is a code for setting the communication speed with the measuring instrument, and can be set in three stages of 1200 bps, 300 bps, and 200 bps. “Data bit length” is a code representing the data bit length used for communication with the measuring instrument, and can be set to 5 bits, 7 bits, or 8 bits. “Stop bit length” indicates a stop bit length used for communication with the measuring instrument, and three bits of 1 bit, 1.5 bit, and 2 bit can be set. The “parity format” is a code representing the parity format of data used for communication with the measuring instrument, and even parity, odd parity, and no parity can be selected. “Number of script commands” is a code representing the number of script commands, and any of 01 to 99 can be set. The “script command” is a control command to the individual measuring instrument interface circuit 3a. “Transmission message length” is a code indicating the data length of the transmission message, and “Transmission message” is the message itself to be transmitted to the measuring instrument. Upon receiving such a script registration command, the parent terminal device 50 returns “B. Response” in FIG. If the script registration message format is correct and the script has been registered, a code indicating normality is entered in the “status”, otherwise a code indicating a command error is returned in the “status”.

  The parent terminal device 50 that has registered the script transmits “A. command” shown in the script execution message format of FIG. 9 to the subordinate terminal devices 51a, 51b,... At the set time intervals. “Terminal code” is a code corresponding to the three terminals of the measuring instrument interface terminals 2a to 2c of the child terminal devices 51a, 51b... (When the host computer 31 establishes a data link with the parent terminal device 50, Code ”and a password corresponding to it are transmitted. Therefore,“ terminal code ”is not included in the script registration command sent from the host computer 31 to the parent terminal device 50).

  When receiving the command, if the format of the command message is not correct, the slave terminal devices 51a, 51b,... Return a “B. response” in FIG. If it is correct, execute the script commands sequentially. When the execution result is normally completed, a code indicating the normal completion of the script is entered in “Status”. Otherwise, a code indicating the script error is entered in “Status”, and “B. Response” in FIG. 9 is returned. To do.

  When the host computer 31 reads the script execution result from the parent terminal device 50, after the data link is established, “A. command” shown in the script execution result read message format of FIG. 10 is transmitted to the parent terminal device 50. The parent terminal device 50 that has received this script execution result read command returns “B. Response” in FIG. If the format of the script execution result read message is not correct, a code indicating a command error is entered in “status”. If it is correct, a code indicating normality is entered in “status”, and all the collected script execution results are transmitted.

  FIG. 11 shows types of script commands executed by the terminal device 1 on the measuring instrument interface circuit 3a (3b, 3c).

  The script command “Meter I / F power on” is to connect the power supplied to the third block 1c in FIG. The script command “Meter I / F power off” is to turn off the power supplied to the third block 1c in FIG. The script command “send mark” is to set the transmission terminal TXD of FIG. 2 to a high level. The script command “send space” is to set the transmission terminal TXD in FIG. 2 to a low level. The script command “waiting” is to wait for the additional information waiting time to elapse without changing the state. For the script command “send message”, set the “send message” in “A. Command” in FIG. 9 for various communication settings (such as “communication speed” and “data bit length”). Accordingly, the transmission terminal TXD in FIG. 2 is set to the high / low level. The script command “timer set” sets a timeout period for script execution. When the timeout time is reached, the script is terminated and a script execution error occurs. The script command “confirm mark signal” is to confirm that the receiving terminal RXD in FIG. 2 becomes high level. If the reception terminal RXD does not go high even after the additional information confirmation time has elapsed, a script execution error is assumed. The script command “confirm space signal” is to confirm that the receiving terminal RXD in FIG. If the reception terminal RXD does not go low even after the additional information confirmation time has elapsed, a script execution error is assumed. The script command “Receive message” monitors the receiving terminal RXD of FIG. 2, converts the high / low level result into data according to various communication settings, and receives the data of the number of digits of the additional information. Until it is received (usually used with a timer).

  FIG. 12 shows a script command example when the measuring instrument interface circuit 3a (3b, 3c) is defined by voltage, its equivalent circuit is 22 in FIG. 4, and the specific circuit configuration is FIG.

  Meter reading is performed by sequentially executing the script commands in FIG. 12 from above by the terminal device 1. (1) Turn on the interface power. (2) The transmission terminal TXD is set to high level. As a result, the transistor Tr1 is turned on, a current flows through the light emitting diode 13a of the transmission photocoupler 13, the light receiving transistor 13b is turned on, and as a result, the transistor Tr2 is turned on. Level voltage is output. (3) By maintaining the high level state for 260 ms, the weighing instrument is urged to prepare for reception. (4) By changing the transmission terminal RXD to high / low level according to various communication settings, the inter-terminal voltage V is changed, and a 10-digit transmission message is transmitted. (5) Set the transmission terminal TXD to low level. As a result, the transistor Tr1 is turned off, no current flows through the light emitting diode 13a of the transmission photocoupler 13, the light receiving transistor 13b is turned off, and as a result, the transistor Tr2 is turned off. become. (6) By maintaining the low level state for 105 ms, the weighing instrument is urged to prepare for reception. (7) The transmission terminal TXD is set to high level. The inter-terminal voltage V becomes high level, prompting transmission itself. (8) A reception timeout time of 4000 ms is set before the reception operation. (9) Tr3 is turned on / off according to the voltage level of the inter-terminal voltage V, the light emitting diode 14a and the light receiving transistor 14b of the receiving photocoupler 14 are turned on / off, and the level of the receiving terminal RXD changes. The reception terminal RXD linked to the voltage level of the inter-terminal voltage V is monitored, the high / low level result is converted into data according to various communication settings, and this is continued until 26 digits of data are received. (10) Turn off the interface power.

  FIG. 13 shows a script command example when the measuring instrument interface circuit 3a (3b, 3c) is defined by current, its equivalent circuit is 24 in FIG. 6, and the specific circuit configuration is FIG.

  Meter reading is performed by sequentially executing the script commands of FIG. 13 from above by the terminal device 1. (1) Turn on the interface power. (2) The transmission terminal TXD is set to high level. As a result, the transistor Tr1 is turned on, a current flows through the light emitting diode 13a of the transmission photocoupler 13, the light receiving transistor 13b is turned on (because the transmission photocoupler 27 of the measuring instrument is turned on), A closed loop current I flows. (3) This state is maintained for 100 ms. (4) By changing the transmission terminal TXD to high / low level according to various communication settings, the closed loop current I is changed and a 16-digit transmission message is transmitted. (5) The transmission terminal TXD is set to high level. A closed loop current I flows. (6) A reception timeout time of 4340 ms is set before the reception operation. (7) The receiving terminal RXD linked to the closed loop current I is monitored, the high / low level result is converted into data according to various communication settings, and this is continued until 37 digits of data are received. (8) Turn off the interface power.

  As described above, since the meter reading can be performed by transmitting the control / monitoring script of the measuring instrument interface circuit 3a (3b, 3c) to the terminal device 1, even if it is a digitized transmission method, a plurality of transmission media are used. Even in a hierarchized system, information related to transmission specifications such as transmission procedure and timing to the measuring instrument can be transmitted to the terminal device 1. For this reason, each operator can perform meter reading without disclosing the transmission specifications of the measuring instrument, which leads to enhanced security. The terminal device 1 does not need to be equipped with a software process that inputs the transmission specification of the measuring instrument, and only by changing the measuring instrument interface circuits 3a to 3c, the terminal device 1 is a two-wire measuring instrument that requires electrical insulation. Since various combinations can be handled, a general-purpose automatic meter reading system can be constructed.

  In addition, since some measuring instrument interface circuits can read two or more measuring instruments, the number of measuring instrument interface circuits equal to the number of measuring instruments is not necessarily required.

  Since the technical idea of the present invention is that “different business operators commonly use one terminal device by changing a script”, the present invention is not limited to the automatic meter reading described in the embodiment, but also monitoring control. It can also be applied to. For example, since the measuring instrument interface circuit of FIG. 6 can be used as a contact input or a contact output, the state change of the contact input can be monitored by extending the script. In addition, if you add a command to return to the previous command several times in the script, you will repeat several commands, and by controlling the contact output, you can control intermittent operation of external devices, etc. Become.

It is a figure which shows the terminal device which is one Example of this invention. It is a figure which shows the basic composition of the measuring instrument interface circuit in one Example of this invention. It is a figure which shows an example of the structure of the measuring instrument interface circuit in one Example of this invention. It is a figure which shows each equivalent circuit of the measuring device interface circuit prescribed | regulated by the voltage, and the measuring device side connection circuit in one Example of this invention. It is a figure which shows the specific circuit structural example of the measuring instrument interface circuit prescribed | regulated by the voltage in one Example of this invention. It is a figure which shows each equivalent circuit of the measuring instrument interface circuit prescribed | regulated with the electric current in one Example of this invention, and a measuring instrument side connection circuit. It is a figure which shows the specific circuit structural example of the measuring instrument interface circuit prescribed | regulated by the electric current in one Example of this invention. It is a figure which shows an example of the format of the script registration message in one Example of this invention. It is a figure which shows an example of the format of the script execution message in one Example of this invention. It is a figure which shows an example of the format of the script execution result read message in one Example of this invention. It is a figure which shows an example of the kind of script command in one Example of this invention. It is a figure which shows an example of the script command with respect to the meter interface circuit prescribed | regulated by the voltage in one Example of this invention. It is a figure which shows an example of the script command with respect to the measuring device interface circuit prescribed | regulated by the electric current in one Example of this invention. It is a figure which shows the structure of the conventional integrated automatic meter-reading system with which this invention is applied. It is a figure which shows the structure of the integrated automatic meter-reading system by which the terminal side was hierarchized by the past and this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Terminal device 2a-2c Measuring instrument interface terminal 3a-3c Measuring instrument interface circuit 4 AC power input terminal 5,6 Transformer 7,12 Power supply circuit 8 Control part 9 PHS modem 13 Photocoupler for transmission 14 Photocoupler for reception 15b Internal circuit Connecting part 15c Measuring instrument connecting part 16 I / F power input terminal 17 I / F power GND terminal 18 Internal power input terminal 19 Internal power GND terminal 31-33 Host computer 37-39 Center device 40 Terminal device 41-43 Measuring instrument 50 Parent terminal device 51a, 51b Child terminal device

Claims (3)

  Connected to the terminal device in an integrated automatic management system that transmits data between one terminal device to which a plurality of different types of management targets are connected and a center device installed for each management target of the same type An interface circuit corresponding to the number of managed objects is provided, a script specific to the managed object for controlling the interface circuit is transmitted from the center device to the terminal device, and the terminal device controls the interface circuit according to the script. An integrated automatic management system characterized in that data is transmitted to a management target or read from the management target.   A terminal device connected to a plurality of different types of management targets and transmitting data to and from a center device installed for each management target of the same type, has an interface circuit corresponding to the number of management targets. And receiving a script specific to the management target for controlling the interface circuit from the center device, and transmitting the data to the management target by reading the script from the management target by controlling the interface circuit according to the script. Terminal device to do. The terminal device according to claim 2, wherein the interface circuit is replaceable.

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