JPH0325271Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Field of industrial application This invention is dedicated to each of multiple measuring devices that should be installed in dispersed locations in a state where the display of measured values cannot be easily seen. A transmitting device that emits a data radio wave modulated with a data signal corresponding to the numerical string of the measured value after receiving the data, and all of this transmitting device can be used in common.
It is used individually for each transmitting device, and when a startup operation is performed, it emits a startup radio wave, and when it receives a data radio wave, it demodulates it into a data signal and displays the corresponding number string. The present invention relates to a remote measuring device in which the number of types of decimal point positions in the number string of the measuring device is two or more.

(b) Prior Art When reading a number string without a decimal point, it is easy to make a mistake in scale. Therefore, in order to deal with this, when the number of types of decimal point positions in the number string of the measurement value of the counting device is two or more, the remote measuring device has a portable reading device that has two or more types of decimal point positions in the number string to be displayed. Each decimal point display means displays a decimal point at the corresponding decimal point position, a scale operation section for specifying the decimal point position to be displayed, and a decimal point display means for the specified decimal point position in conjunction with this scale operation section. A device equipped with a decimal point display switching means for displaying a decimal point has already been proposed.

However, according to this prior art, if the measuring device is installed in a hole under the ground where the measured value cannot be easily seen, the reading operator may confuse the type to which it belongs and set the decimal point position. The disadvantage is that it is possible to make mistakes.
Such a mistake has serious consequences whether the readings of the measuring device are used for transactions or management purposes.

C. Purpose of the invention The purpose of this invention is to obtain a remote measuring device that does not have the above-mentioned drawbacks of the prior art.

D. Structure of the invention As will be explained later with reference to the embodiments, the structure of the invention is such that the remote measuring device is used when there are two or more types of decimal point positions in the numerical string of the measurement value of the measuring device, and each The carrier frequency of data radio waves emitted by the transmitting device 5 dedicated to the measuring device 4 is set to a type-specific frequency that is a unique value for each type to which the measuring device 4 belongs, and the transmitting device 5
After receiving the startup radio wave, before emitting the data radio wave, the adjustment radio wave generating means 12, 13, 1 emit an adjustment radio wave having the same carrier frequency as the data radio wave.
tuning means 21, 24, 25, which automatically tunes to the carrier frequency of the portable reading device 6 while receiving the adjustment radio wave and maintains the tuned state while receiving the data radio wave; , each decimal point display means 30a for displaying a decimal point at each decimal point position in the number string displayed corresponding to each of the types,
30b, and decimal point display control means 21, 27 for displaying a decimal point only on those decimal point display means corresponding to the type in which the carrier frequency of the adjustment radio wave in the tuned state is set as the type-specific frequency. It is an automatic positioning remote measuring device.

E. Embodiment In the embodiment described below, as shown in FIG. This invention is applied to a water meter as a measuring device 4 installed in an installation hole 3 made under the ground surface, so that the display of measured values cannot be easily seen. The measuring device 4 stores an 8-digit number string of the flow rate integrated value, which is a measured value, and in this number string, when the unit is cubic meters (m ³ ), the decimal point position is to the right of the fourth digit from the left. There are two types: (nominal capacity 75mm) and the one to the right of the fifth digit (nominal capacity 150mm). 5 is a transmitting device dedicated to each measuring device 4, and includes a built-in circuit shown in FIG. Reference numeral 6 denotes a portable reading device that is shared by all measuring devices 4 and used individually for each transmitting device 5, and has a built-in circuit shown in FIG. 3.

In FIG. 2 showing the circuit of each transmitter 5, 4
is any type of measuring device that uses a built-in digital IC to store an 8-digit number string representing the current cumulative flow rate as a measured value in the form of a corresponding binary signal. A receiving antenna 7 receives the activation radio wave from the mobile reader 6. 8 is a transmitting antenna that emits adjustment radio waves and data radio waves. Inside the transmitting device 5, a battery 9 supplies power to the entire circuit shown in FIG. A receiving section 10 receives a starting signal based on a starting radio wave received by the receiving antenna 7 and transmits it to the control section 11 .

When the activation signal ends, the control section 11 instructs the transport oscillation section 12 and the adjustment oscillation section 13 to start oscillation, and the control section 11 instructs the transport oscillation section 12 and the adjustment oscillation section 13 to start oscillation, and the after-mentioned tuning means 21, 24,
After a predetermined period of time long enough for the oscillator 25 to be in synchronization, the adjustment oscillator 13 is commanded to stop oscillation, and at the same time the readout section 14 is commanded to start reading. At the same time as instructing the oscillating section 12 to stop oscillation, it also instructs the reading section 14 to stop reading.

The carrier oscillator 12 generates a carrier wave, which is a continuous sine wave signal, having a type-specific frequency predetermined to a value unique to the type to which the measuring device 4 belongs, until it is instructed to start oscillation and then stop oscillation. A signal is generated and transmitted to the modulation section 15. The adjustment oscillation section 13 generates an adjustment signal that is a continuous sine wave signal of a constant audio frequency and transmits it to the modulation section 15 until it is instructed to start oscillation and then stop oscillation. The reading unit 14 generates a short-time continuous sine wave signal of audio frequency with two levels of high and low levels corresponding to the binary signal stored in the measuring device 4 at that time until the reading unit 14 is instructed to start reading and then is instructed to stop reading. A data signal, which is a continuous signal, is generated and transmitted to the modulation section 15.

The modulation unit 15 modulates the transmitted carrier wave signal with the transmitted adjustment signal and data signal, respectively, and transmits the adjustment modulation signal and the data modulation signal to the transmission unit 16 in this order. tell to.

The transmitting antenna 8 emits adjustment radio waves and data radio waves of the same frequency in this order based on these modulated signals.

In this way, when the transmitting device 5 dedicated to each measuring device 4 receives the activation radio wave, the transmitting device 5 modulated with the data signal corresponding to the 8-digit number string representing the measured value of the measuring device 4 is transmitted. In addition to emitting radio waves for data, the carrier frequency of the radio waves for data is a type-specific frequency specific to the type to which the measuring device 4 belongs, and after receiving the startup radio wave and before emitting the radio waves for data, the carrier frequency of the radio wave for data is A control section 12, an adjustment oscillation section 13, a modulation section 15, a transmission section 16, and a transmission antenna 8 are provided as an adjustment radio wave generating means that emits adjustment radio waves having the same carrier frequency. however,
Of these, the parts other than the adjustment transmitter 13 are also used as means for generating data radio waves.

In FIG. 3 showing the circuit of the portable reading device 6,
17 is a dual-purpose antenna that emits startup radio waves and receives adjustment radio waves and data radio waves. Reference numeral 18 denotes a starting operation section, which is pushed in when reading is started with the dual-purpose antenna 17 inserted into the upper and lower through holes 1 as shown in FIG. 1, and returned when reading is finished. A battery 19 supplies power to the entire circuit shown in FIG. Reference numeral 20 denotes a starting switch, which becomes conductive when the starting operation part 18 is pushed in to start the control part 21, and shuts off and stops the control part 21 when it is returned.

When the control unit 21 is started, the switching unit 22 first selects the transmission unit 23 to which the signals of the dual-purpose antenna 17 are mutually transmitted.
, and then instructs the transmitting section 23 to generate a start signal, and after a certain period of time, the switching section 22 switches the dual-purpose antenna 17 to the receiving section 24 , which is the mutual transmission destination. command. While being switched to the receiving section 24, the transmitting section 23 generates a starting signal and transmits it to the dual-purpose antenna 17 via the switching section 22, thereby generating a starting radio wave.

When the dual-purpose antenna 17 receives an adjustment radio wave or a data radio wave while the mutual signal transmission destination is the receiving unit 24, the adjustment modulation signal or data modulation signal is transmitted to the reception unit 24.

The frequency variable section 25 generates a frequency signal (voltage in this example) that is a signal transmitted from the control section 21.
The receiving section 2 generates a tuning signal of a frequency corresponding to
Tell 4.

The receiving unit 24 first compares the frequency of the tuning signal received from the frequency variable unit 25 with the frequency of the adjusting modulation signal received from the dual-purpose antenna 17 via the switching unit 22, and determines that the difference matches a predetermined value (intermediate frequency). When in the tuned state, the control unit 21
When the difference is larger or smaller than a predetermined value, a correction signal smaller or larger than the fixed voltage is sent to the control section 21.

The control unit 21 controls the frequency variable unit 25 when the correction signal received from the reception unit 24 is the constant voltage.
The frequency variable section 25 keeps the frequency signal transmitted to the receiving section 24 unchanged, or when the frequency signal is smaller or larger, the voltage of the frequency signal is made smaller or larger.
The frequency of the tuning signal transmitted to the device is changed until a tuned state is achieved.

The receiving unit 24 demodulates the adjustment modulation signal and the data modulation signal received in the tuned state into an adjustment signal and a data signal, and transmits the demodulated signals to the meter reading unit 26.

The meter reading unit 26 receives the received adjustment signal and data signal in a continuous 2-wavelength range consisting of a range of potentials corresponding to the high and low audio frequencies, with a high potential during the adjustment signal and a low potential at the beginning of the data signal. It is converted into a value signal and transmitted to the control section 21.

The control unit 21 sets a decimal point corresponding to the frequency signal transmitted to the frequency variable unit 25 when the receiving unit 24 enters the tuned state (via the adjustment modulation signal received by the receiving unit 24 and the tuning signal in the tuned state). The position signal and the binary signal transmitted from the meter reading section 26 are temporarily stored and transmitted to the drive section 27.

The display unit 28 includes an eight-digit number display 29 and decimal point displays 30a and 30b immediately to the right of the fourth and fifth digit number display signals from the right.

The driving unit 27 displays the corresponding decimal point display on the basis of the transmitted decimal point position signal, and displays the corresponding number string on the numerical display 29 based on the transmitted binary signal.

In this way, the portable reading device 6 shared by all the transmitting devices 5 emits a startup radio wave when activated, receives a data radio wave, demodulates it into a data signal, and displays a corresponding number string. In addition, the control section 21, the frequency variable section 25, and the receiving section 24 serve as tuning means that automatically tunes to the carrier frequency while receiving adjustment radio waves and maintains the tuned state while receiving data radio waves. and a measuring device 4
Each decimal point display means 30a, 30b displays a decimal point at each decimal point position in the number string displayed corresponding to each type, and the carrier frequency of the adjustment radio wave in the tuned state of the decimal point display means is determined by type. A control section 21 and a driving section 27 are provided as a decimal point display means for displaying a decimal point only on the decimal point corresponding to the type of frequency. However, among these,
The components other than the tuning means consisting of a part of the control section 21, a part of the reception section, and the frequency variable section 25 are necessary for manually switching the decimal point position and displaying a numeric string.

Note that when there are three or more types of decimal point positions in the number string representing the measured value of the measuring device 4,
In the embodiment described in FIGS. 2 and 3,
The oscillation frequency of the transport oscillation unit 12 of the transmitting device 5 is determined individually for each type, and a part of the control unit 21, a part of the receiving unit 24, and a frequency variable unit 25 constituting the tuning means of the manual reading device 6 are set individually. It is possible to tune to each oscillation frequency, and the control section 21 and the driving section 21 are set to a decimal point display 30.
a, 30b, etc., so that each type of decimal point position can be displayed.

F. Function Since it is configured in this way, as shown in FIG. After that, by the time the reading of the display of the number string is completed, the states shown to the outside by the transmitting device 5 and the portable reading device 6 will change as time progresses, as shown in the upper and lower rows of FIG. 4, respectively. Change.

First, when the starting operation part 18 is pushed in at time a, a state in which starting radio waves are emitted from the dual-purpose antenna 17 continues until time b. When the starting radio wave is received by the receiving antenna 7 and the starting radio wave ends, the transmitting antenna 8 first emits modulated radio waves for adjustment from time points c to d, followed by modulated radio waves for data from time points d to e, after a slight delay. The carrier frequency of these modulated radio waves is
This is a type-specific frequency of the type to which the measuring device 4 belongs to the transmitting device 5.

In response to this, the portable reading device 6 becomes in a state where it is tuned to the type-specific frequency which is the frequency of the modulated radio wave for adjustment between e and d, and receives the modulated radio wave for data between d and e in the tuned state, and the number string is After reading the binary signal corresponding to and temporarily memorizing it, the corresponding number string is displayed on the display section 2 with a decimal point in the correct position corresponding to the tuned type frequency.
Display on 8. When the starting operation section 18 is turned back at any time g, the display on the display section 28 disappears.

G Effect of the invention According to this invention, even if the measuring device 4 is installed in a state where the measured value cannot be easily viewed, the display section 28 of the portable reading device 6 displays the numerical string of the measured value as well as the measuring device 4. The decimal point is displayed in the correct position corresponding to the type of . In other words, the drawback of the prior art that it is easy to make mistakes in scale has been completely eliminated.

In addition, when using this embodiment, even if the carrier frequencies of the adjustment radio waves and data radio waves no longer match the regular frequency for each type for some reason, there is no need to re-tune on the mobile reading device side. do not have.

[Brief explanation of the drawing]

The figures all relate to one embodiment of this invention; Fig. 1 is a sectional view showing the installation state of the measuring device in the installation hole and the usage state of the portable reading device, Fig. 2 is the circuit diagram of the transmitting device, and Fig. 3 is Circuit diagram of portable reader, No. 4
The figure is a diagram illustrating the operation of the transmitting device and the portable reading device. 4...Measuring device, 5...Transmitting device, 6...Mobile reading device, {12...Control unit, 13...Adjustment oscillation unit, 15...Modulation unit, 16...Transmission unit,}Adjustment radio wave Generating means, {21...control section, 24...receiving section, 25...frequency variable section,}tuning means, 30
a, 30b... Decimal point display means, {21... Control section, 27... Drive section} Decimal point display control means.

Claims (1)

[Scope of utility model registration request] A plurality of measuring devices 4 that should be installed in dispersed locations so that the display of measured values cannot be easily seen.
a transmitting device 5 which is dedicated to each of the above, and which emits a data radio wave modulated with a data signal corresponding to a number string consisting of a certain number of numbers representing a measured value after receiving the startup radio wave; It is shared by all of the transmitting devices 5 and is closed individually for each transmitting device 5, and when a startup operation is performed, it emits a startup radio wave, and when it receives a data radio wave, it demodulates it into a data signal and responds to this. In a remote measuring device comprising a portable reading device 6 that displays a string of numbers, when the number of types of decimal point positions in the string of numbers of the measuring device 4 is two or more, the transmission dedicated to each measuring device 4 is provided. The carrier frequency of the data radio waves emitted by the device 5 is set to a type-specific frequency, which is a unique value for each type to which the measuring device 4 belongs, and the transmitting device 5 transmits the data radio waves after receiving the startup radio wave. adjustment radio wave generating means 12, 13, which generates an adjustment radio wave having the same carrier frequency as the data radio wave before emitting it;
15, 16, tuning means 21, 24, 25 that automatically tunes to the carrier frequency of the portable reading device 6 while receiving the adjustment radio wave and maintains the tuned state while receiving the data radio wave; each decimal point display means 30a for displaying a decimal point at each decimal point position in the number string displayed corresponding to each of the types;
30b, and decimal point display control means 21, 27 for displaying a decimal point only on those decimal point display means corresponding to the type in which the carrier frequency of the adjustment radio wave in the tuned state is set as the type-specific frequency. automatic positioning remote measuring device.