KR20000001603A - Apparatus for controlling remote probe - Google Patents

Abstract

PURPOSE: An apparatus for controlling remote probe is provided to improve the reliability of a communication by removing the occurrent of an unnecessary interrupt by a noise using a synchronizing character with 2 bits. CONSTITUTION: A measuring instrument connecting unit(31) to be connected to a measuring instrument(4) receives a pulse signal inputted from the measuring instrument(4). A data display unit(32) displays the use amount of the measuring instrument(4) and each data. A detecting unit(3b) to be connected to a security and anti-disaster sensor(5) detects the operation state of the security and anti-disaster sensor(5). A measuring instrument setting unit(3f) sets a kind of the measuring instrument(4) and a mount of the measuring instrument(4). A real time clock(3e) manages the using amount of the measuring instrument(4). An input device connecting unit(38) receives data such as data by an hour and a current using amount. A reset unit(31) monitors the operation stage of a CPU(30) and receives a watchdog signal. A decoder(33) is controlled by the CPU(3) and outputs a chip selection signal. A power line communicating unit(35) is connected to a 220V low voltage distribution line(7) and amplifies and modulates an input signal.

Description

Remote meter reading control device

The present invention relates to a terminal device for both meter reading and safety management as a communication medium through a distribution line, and more particularly, to a meter reading meter and a remote meter reading control device suitable for safety management using a disaster prevention sensor.

In general, the remote meter reading control device reads the amount of various meters (electric meter, gas meter, water meter, etc.) installed in the customer by using a communication medium such as wired or wireless without reading the customer directly. Say the device.

Typically, the remote meter reading device is connected to a meter installed in each customer, a meter terminal for counting the usage of the meter, a meter computer for performing the meter, a data relay device for performing a signal relay function between the meter terminal and the meter computer In addition, as an additional device, there is an input device for inputting a current meter value to the meter reading terminal at the time of initial installation of the device.

In addition, the communication method of the remote meter reading device includes a dedicated line method using a separate signal line, a telephone line method using a telephone line, and wireless radiation to construct a system. Recently, a power line method using a 220 V power line as a communication medium has been developed. It is becoming.

Recently, as the desire for safety from disasters such as theft, fire, and gas accidents increases, safety management terminals with cameras have been developed and mainly applied to apartment complexes. It will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the configuration of a conventional remote metering control device, which is connected to a meter 4 as shown therein and receives a meter connection portion 31 for receiving a pulse proportional to the amount of use; A data display unit 32 for displaying the usage amount of the meter 4; CPI 30 for overall control of all operations; A decoder 33 for outputting a chip select signal corresponding to the control signal of the CPI 30; A power line communication unit 35 connected to the 220V low voltage distribution line 7 and communicating with the upper central controller; A USART (Universal Synchronous / Asynchronous Receiver Transmitter) 34 positioned between the CPI 30 and the power line communication unit 35 to perform a data relay function; An input device connection unit 38 connected to an input device (not shown) to receive a current usage of the meter 4; RAM (37) for storing the data counting the pulse signal from the meter input through the meter connection unit 31; A ROM (36) in which a program for performing the functions of each unit is stored; A power supply unit 39 connected to the 220V low voltage distribution line 7 to supply operating power to the respective units; It consists of a bus 3a which is a path for address and data.

FIG. 2 is a remote meter reading apparatus to which the remote meter reading control apparatus of FIG. 1 is applied, and the operation of the conventional apparatus will be described in detail with reference to the remote meter reading apparatus.

First, the meter reading function is described by connecting a separate input device (not shown) to the input device connecting portion 38, and inputting the current amount of use of each of the meters 4 connected to the input device connecting portion 38. Data is stored at a predetermined address of the RAM 37.

At this time, the CAPI 30 checks whether pulses from the meter 4 are input through the meter connection part 31 at predetermined intervals (several milliseconds to several tens of milliseconds).

If the pulse is input from the meter 4, the high state of the pulse is continuously checked at a predetermined interval, and the number of times is checked, and if the pulse transitions to low, the CPI 30 determines that the high state of the counted pulse is a predetermined number of times ( If it is more than the predetermined number of times, it is considered that one pulse is input from the meter 4, and the corresponding meter 4 stored at the predetermined address of the RAM 37 is determined. Is added to the amount used and stored in the RAM 37. If the high state of the pulse counted by the CPI 30 is less than or equal to the predetermined number of times, it is regarded as noise and ignored.

Here, the remote meter reading control device (3) in the customer of the remote meter reading device has a function to read the meter at each time zone 4 so that the normal oil is input from the meter (4) the CAPI (30) is the meter (4) ), As well as the amount of time used for the pulse.

In this case, the time calculation uses a timer interrupt built in the CAPI 30, and may divide the 24 hours a day into several time zones to manage the usage time of each meter (4).

In addition, the amount of each meter 4 stored in the RAM 37 is displayed on the data display unit 32 so as to be seen by the customer, and the CPI 30 is equal to the number of meters 4 connected to the meter connection unit 31. The usage amount of each meter 4 stored in the RAM 37 is read out and displayed sequentially at predetermined intervals.

In this case, various types of information such as the type of the meter 4 displayed on the data display unit 32, the predetermined time interval in which each data is displayed, the number of time zones to be managed, and the like are provided using a separate input device. Is entered through.

In addition, the operation of communicating with the host apparatus through the 220V low voltage distribution line 7 will be described. First, when the meter reading command is transmitted from the meter reading computer 1, the meter reading command is transmitted to the power line communication unit of the control device via the central controller 2. In this case, the central controller 2 modulates the metering command signal into an analog signal and transmits the analog signal through the 22V low voltage distribution line 7.

Thereafter, the power line communication unit 35 removes the 60 Hz low frequency signal mixed with the high frequency meter reading command signal transmitted through the 220V low voltage distribution line 7 and attenuates while being transmitted through the 220V low voltage distribution line 7. The demodulated signal is amplified and demodulated into a digital signal and transmitted to the USART 34.

Accordingly, when the USART 34 receives a signal, the USART 34 transmits an interrupt signal to the CPI 30 through the 'RxRDY' pin, whereby the CPI 30 determines that the valid data is input, thereby deciding the decoder 33. After enabling the USART 34 and reading data from the USART 34, the address of the remote meter reading control device 3, the type of command, whether the transmitted data is errored, the type of the meter 4, or the like. If there is no abnormality, the reading of the meter 4 is read from a predetermined address of the RAM 37, the USART 34 is enabled again through the decoder 33, and then the USART 34 is read. In addition to transmitting data, the transmission control unit built in the power line communication unit 35 is also enabled.

Accordingly, the power line communication unit 35 is switched to the transmission mode and data input to the USART 34 is immediately input to the power line communication unit 35.

Here, the power line communication unit 35 modulates and amplifies the digital data signal inputted from the USART 34 into an analog signal and transmits the amplified signal to the 220V low voltage distribution line 7.

Thereafter, the analog signal is transmitted to the meter reading computer 1 via the central controller 2, and if an error occurs during the communication process, the communication is repeated in the above-described process.

When the relay function of the control device is described, a plurality of customers exist in the same 220V low voltage distribution line 7, and a plurality of remote meter reading control devices 3 are installed in each customer.

At this time, the 220V low voltage distribution line 7 has a large attenuation of the signal due to the characteristics of the line, so that the remote meter reading control device 3 of the customer away from the central controller 2 may not be in communication.

Accordingly, the remote meter reading control device 3 of the customer to perform a relay function at a predetermined distance interval between the central controller 2 and the remote meter reading control device 3 located farthest, and the meter reading computer 1 By inputting the address for the remote reading control device (3) of the customer selected by using, the selected remote reading control device (3) of the selected customer receives the data to the remote reading control device (3) of the customer without a relay function The transmission ensures the reliability of communication and at the same time expands the communication range.

However, the conventional apparatus operating as described above uses only one-byte synchronous characters in communication, which implies the possibility of abnormal operation of the device due to the occurrence of unnecessary data reception interrupts due to noise. Inaccurate time management, and there is no setting function of the type of meter connected to the meter connection part.Therefore, the pulse detection is inefficient due to the long period of pulse generation or short meter.In addition, the usage data of the connected meter has a predetermined interval. In order to identify the desired data by displaying it on the display sequentially each time, it is necessary to wait until the corresponding data is displayed. Also, since the address of the device is stored in the ROM, there is a problem that it is impossible to change the address when the system is expanded or if necessary. .

Accordingly, an object of the present invention is to provide a remote meter reading control device as a communication medium through a distribution line that can be suitable for safety management by using a meter for metering and a disaster prevention sensor. have.

1 is a block diagram showing the configuration of a conventional remote metering control device.

Figure 2 is a block diagram showing the configuration of a typical remote meter reading device.

Figure 3 is a block diagram showing the configuration of the remote meter reading control device of the present invention.

4 is a block diagram showing the configuration of a power line communication unit in FIG.

FIG. 5 is a block diagram showing the configuration of a detector in FIG. 3; FIG.

FIG. 6 is a circuit diagram showing a configuration of a meter connecting portion in FIG.

FIG. 7 is an output waveform diagram in FIG. 6; FIG.

***** Description of the symbols for the main parts of the drawings *****

4: meter 5: sensor

6: input device 7: 220V low voltage distribution line

30: CPI 31: Meter connection

32: data display section 33: decoder

34: USART 35: Power Line Communication

36: Romans 37: Ram

38: input device connection 39: power supply

3a: bus 3b: detector

3c: alarm part 3d: status display part

3e: RTC 3f: Meter setting part

3g: Address setting section 3h: key

3i: reset section

An object of the present invention for achieving the above object is connected to the meter and meter connection unit for receiving a pulse signal input from the meter; A data display unit which displays the amount of use of the meter and various data; A detection unit connected to the crime prevention and disaster prevention sensors to detect an operation state of these sensors; An alarm unit for informing a user of a customer of a state detected by the detector; A meter setting unit for setting the type and quantity of the meter; An address setting unit for setting an address; RTC for managing the hourly usage of the meter; An input device connection unit connected to the input device to receive data such as a current time, time zone data, and current usage amount; A key for usage tracking and alarm activation and deactivation; Connected to CPI to monitor its operation and receiving a watchdog signal from the CPI every predetermined time and inverting the current state, and outputting a reset signal to the CIF if the watchdog signal is not received from the CPI for a predetermined time. A reset unit; A decoder controlled by the CPI to output a chip select signal to each unit; A bus which is a path for data and address signals; A power line communication unit connected to a 220V low voltage distribution line to extract an input signal, amplify and demodulate the output signal, and modulate and amplify a digital signal when transmitting data to the 220V low voltage distribution line; A USART which outputs an interrupt signal to the CPI when data is input to the power line communication unit and transmits a digital signal to the power line communication unit when data is transmitted to the central controller; A RAM for storing data input through the meter connection unit; A ROM storing a program for performing the functions of each unit; Characterized in that the power supply for rectifying the 220V power supplied to the power line communication unit to supply the operating power accordingly.

Hereinafter, the operation and effects of the remote meter reading control device according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 3 is a block diagram showing the configuration of the remote meter reading control device of the present invention, and a meter connecting portion 31 connected to the meter 4 and receiving a pulse signal input from the meter 4, as shown therein; A data display unit 32 which displays the amount of usage of the meter 4 and various data; A detection unit 3b connected to the crime prevention and disaster prevention sensor 5 and detecting an operation state of these sensors; An alarm unit 3c for informing a user of a consumer of the state detected by the detector unit 3b; A meter setting unit 3f for setting the type and quantity of the meter 4; An address setting unit 3g for setting an address; RTC (Real Time Clock: 3e) for managing the time-phase usage of the meter (4); An input device connection unit 38 connected to the input device 6 to receive data such as current time, time zone data, current usage amount, and the like; A key 3h which functions to query usage and to activate and release alarms; It is connected to the CPI 30 and monitors the operation state of the CPI 30 and receives a watchdog signal from the CPI 30 every predetermined time, and the current state is reversed. A reset unit 3i for outputting a reset signal to the CPI 30 when a call is not received; A decoder 33 controlled by the CPI 30 for outputting a chip select signal to each unit; A bus 3a which is a path for data and address signals; A power line communication unit 35 connected to the 220V low voltage distribution line 7 to extract an input signal, amplify and demodulate the output signal, and modulate and amplify the digital signal when transmitting the data to the 220V low voltage distribution line 7; The USART 34 outputs an interrupt signal to the CPI 30 when data is input to the power line communication unit 35, and transmits a digital signal to the power line communication unit 35 when data is transmitted to the central controller 2. ; RAM (37) for storing the data input through the meter connection unit 31; A ROM (36) in which a program for performing the functions of each unit is stored; The power supply unit 39 rectifies the 220V power supplied to the power line communication unit 35 and supplies operating power accordingly.

4 is a block diagram showing the configuration of the power line communication unit 35. As shown in FIG. 4, a digital signal input from the USART 34 is modulated and output into an analog signal, and an amplified analog signal is received. An FSK modem 351 for demodulating the digital signal and outputting the demodulated signal to the USART 34; A power amplifier 353 which receives an analog signal from the FSK modem 351 and amplifies it; A transformer unit 355 which receives the amplified signal of the power amplifier 353 and sends it to the 220V low voltage distribution line 7 and extracts a high frequency communication signal inputted through the 220V low voltage distribution line 7; A receiving end amplifier 354 which receives the signal extracted from the transformer unit 355 and amplifies it and outputs the amplified signal to the FSK modem 351; A transmission control unit 352 controlled by the CPI 30 to enable the power amplifier 35 during data transmission to the central controller 2; The inverter 356 is controlled by the CPI 30 and enables the FSK modem 351 which is low active during data transmission.

FIG. 5 is a block diagram showing the configuration of the detector 3b, and as illustrated therein, a sensing unit 3b1 for detecting an operation state of the crime prevention and disaster prevention sensor 5 and outputting an interrupt signal according thereto; It is composed of a determination unit (3b2) for determining whether the operation of the crime prevention and disaster prevention sensor (5).

The operation of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, the meter setting unit 3f is to set the type and quantity of the meter 4 connected to the meter connection part 31, and is composed of an 8-pin dip switch and a buffer, and the upper 4 bits are the type of the meter 4. The lower 4 bits are used to set the quantity of the connected meter 4.

Examples of setting the dip switch are shown in Tables 1 and 2 below.

Dip switch Type of meter connected to meter connection 7 6 5 4 0 0 0 One Both electric meter 0 0 One 0 Water meter 0 0 One One Both gas meter 0 One 0 0 Both hot water meter 0 One 0 One All calorimeter 0 One One 0 5 meters

Dip switch Quantity of meter connected to meter connection 3 2 One 0 0 0 0 One 1 unit 0 0 One 0 2 units 0 0 One One 3 units 0 One 0 0 4 units 0 One 0 One 5 units

That is, since the width and period of the pulses generated by each of the meters 4 are different, the time interval for checking the pulses can be efficiently divided by dividing the meter 4 with the long pulse width and the short meter 4.

Generally, the pulse meter 4 has a numerical difference 42 in which numbers from 0 to 9 are displayed as shown in FIG. 6, a magnet 43 attached to the rear of the numerical difference 42, and the numerical difference ( As the 42 rotates, a magnetic switch 41 is installed to operate by a magnet 43 located at the rear of the numerical difference 42. The pulse meter 4 is different from the meter connection part 31. It is connected by the pulse signal line 44.

When the pulse signal of the meter 4 is detected, the ENP transistor Q1 of the meter connection part 31 has the CPI 30 in a state in which no pulse is generated (the magnetic switch 41 is open). ), The output stage of the ENP transistor Q1 is always kept high because the pulse check signal P_CHK is output, and the output is inverted by the Schmitt trigger IC1. ) Becomes low.

On the other hand, in the state where the pulse is being generated (the magnetic switch 41 is closed), the ENP transistor Q1 is turned on, and the output signal P_OUT becomes high.

At this time, a noise removing circuit 311 is added to the meter connecting portion 31 connected to the meter 4 and the pulse signal line 44 to perform chattering generated when opening and closing of the noise and magnetic switching input along the pulse signal line. Here, Figure 7 (a) shows the pulse generation time (pulse width: T1) and Figure 7 (b) is a waveform that is not inverted by the Schmitt trigger (IC1) when the pulse is generated 'T2' The cycle of the pulse check signal P_CHK outputted at 30 is shown. In addition, FIG. 7C is an output signal inverting FIG. 7B and 'T3' is the duration of the pulse check signal P_CHK. It means time.

In the case of detecting an alarm signal, first, a plurality of disaster prevention sensors 5 such as crime prevention, fire, and gas can be connected, and when one of the connected sensors 5 is operated, two four input oragates and one The sensing unit 3b1 composed of two input orifices detects this and transmits an interrupt signal to the CPI 30.

Accordingly, the CPI 30 determines which sensor 5 inputs a signal through the discriminating unit 3b2 and displays it on the state display unit 3d composed of several LEDs and additional circuits.

In addition, the alarm driving circuit and the alarm of the alarm unit 3c are controlled to propagate the alarm situation, and the alarm signal is also sent to the meter reading computer 1 through the upper central controller 2 in case there is no user in the customer where the alarm has occurred. Send it.

The data transmission / reception process is the same as in the prior art, except that a data reception interrupt occurs unnecessarily due to noise by adding only one byte of sync character (FFH) during data transmission, thereby causing an abnormal operation of the device itself.

Accordingly, the present invention uses the two-byte sync character (FFAAh), changes the interrupt source that is generated when a signal is input to the USART 34 from 'RxRDY' to 'SYNCDET', and the CPI 30. A reset section 3i for monitoring the operation state of the circuit is added to improve the reliability of the communication.

In addition, the address setting unit 3g according to the present invention sets a unique address, and the key 3h is data that the user can inquire at random about the usage time of the meter 4 displayed on the data display unit 32. Inquiry key, alarm on / off can be set, and it is easy to provide accurate time information and manage usage by time by separate RTC (3e).

As described in detail above, the present invention improves the reliability of communication by eliminating unnecessary interruptions due to noise by using two-byte sync characters in communication, and provides an accurate time information to the device by adding a separate RTC. It is easy to manage usage by unit, and it is possible to efficiently detect different pulses for each meter by adding the meter setting unit that can set the type and quantity of the meter. Also, it can quickly search the desired data by adding the usage inquiry key. By adding a setting part, the address can be changed arbitrarily as necessary when installing the system, and the system environment can be provided according to the local situation, and the safety management function of the method needle disaster prevention is added to satisfy the desire from safety at low cost. It can be effected.

Claims (3)

A meter connection part connected to the meter and configured to receive a pulse signal input from the meter; A data display unit which displays the amount of use of the meter and various data; A detection unit connected to the crime prevention and disaster prevention sensors to detect an operation state of these sensors; An alarm unit for informing a user of a customer of a state detected by the detector; A meter setting unit for setting the type and quantity of the meter; An address setting unit for setting an address; RTC for managing the hourly usage of the meter; An input device connection unit connected to the input device to receive data such as a current time, time zone data, and current usage amount; A key for usage tracking and alarm activation and deactivation; Connected to CPI to monitor its operation and receiving a watchdog signal from the CPI every predetermined time and inverting the current state, and outputting a reset signal to the CIF if the watchdog signal is not received from the CPI for a predetermined time. A reset unit; A decoder controlled by the CPI to output a chip select signal to each unit; A bus which is a path for data and address signals; A power line communication unit connected to a 220V low voltage distribution line to extract an input signal, amplify and demodulate the output signal, and modulate and amplify a digital signal when transmitting data to the 220V low voltage distribution line; A USART which outputs an interrupt signal to the CPI when data is input to the power line communication unit and transmits a digital signal to the power line communication unit when data is transmitted to the central controller; A RAM for storing data input through the meter connection unit; A ROM storing a program for performing the functions of each unit; And a power supply unit configured to rectify 220V power supplied to the power line communication unit and supply operating power according thereto. The apparatus of claim 1, further comprising: an FSK modem for modulating and outputting a digital signal input from the USART into an analog signal, receiving an amplified analog signal and demodulating the digital signal into a digital signal; A power amplifier which receives an analog signal from the FSK modem and amplifies it; A transformer unit which receives the amplified signal of the power amplifier and sends it to a 220V low voltage distribution line and extracts a high frequency communication signal input through the 220V low voltage distribution line; A receiver stage amplifier unit which receives the signal extracted from the transformer unit and amplifies it and outputs the signal to the FSK modem; A transmission control unit controlled by the CPI to enable the power amplifier when transmitting data to a central controller; And an inverter configured to control the CPI to enable the FSK modem which is low active during data transmission. The apparatus of claim 1, further comprising: a sensing unit detecting an operation state of the crime prevention and disaster prevention sensor and outputting an interrupt signal according thereto; Remote meter reading control device characterized in that configured as a discriminating unit for determining whether the operation of the crime prevention and disaster prevention sensor.