JP2003274036A - Remote supervisory system for facility/device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and accurately discriminate the propriety of an installed place for a telemetering PHS for transmitting data of facility/device to a center apparatus at a remote place. <P>SOLUTION: A PHS 2 measures the number of frame errors and the electric field strength from base stations 4, 5 for a prescribed time to calculate an average value of measured values of the base stations 4, 5. A discrimination display light (not shown) is lighted/put out as a condition of propriety discrimination of an installed place of the PHS 2 on the basis of the average value of the electric field strength values of the base stations 4, 5 with the highest electric field strength, the minimum value of the electric field strength of the base stations 4, 5 and the average value of the number of frame errors. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for transmitting equipment or device data to a center device for remote monitoring.

[0002]

2. Description of the Related Art Data of monitored equipment such as vending machines, gas meters, and equipment of elevators is transmitted to a center device installed at a remote place via a communication line for remote monitoring. At this time, it is known to use a PHS for telemetering as a communication device that transmits the data of the monitored device. This is shown in FIG. Reference numeral 21 denotes a telemetering PHS, which has a built-in display unit 22 for displaying the electric field strength. Reference numeral 23 is a measuring instrument, which has a function of measuring the electric field strength and a frame error occurrence rate.

The electric field strength display section 22 indicates where the PHS21 for telemetering can be installed in the monitored device.
Then, the judgment is made based on a predetermined condition (for example, two or more bars are displayed). Alternatively, the measuring instrument 23 is used to measure and determine the electric field strength and the frame error at that time.

[0004]

In the above-mentioned conventional remote monitoring apparatus for equipment and devices, the electric field strength and the frame error are measured to determine the installation location of the PHS 21 for telemetering. Depending on the distance between the PHS 21 and the base station and the environment, the electric field strength may fluctuate or radio wave interference may occur, resulting in frequent communication failures.
The base stations are installed with mixed radio waves, and even if strong electric field strength can be received, the distance to the base station is long, the radio waves are unstable, and the surrounding environment. The radio wave may be disturbed and the success rate of communication may decrease.

Further, even if the maximum electric field strength is low, communication is successful if the environment is such that a plurality of base stations can be used, or even a low output base station has a short distance and can receive stable radio waves. The probability is high. As described above, in the temporary electric field strength measurement, it is difficult to determine whether or not the actual communication is successful.

The present invention has been made to solve the above problems, and provides a remote monitoring device for equipment / devices capable of easily and accurately determining whether or not the installation location of the telemetering PHS is possible. The purpose is to provide.

[0007]

A remote monitoring device for equipment / device according to a first aspect of the present invention collects data of the equipment or device by a portable communication device, wirelessly communicates the data with a base station, and executes remote communication. In the device for transmitting to the center device installed on the ground, the portable communication device, a judgment indicator light for indicating whether the electric field strength from the base station and the number of frame errors satisfy predetermined conditions, and by a manual operation A switch for changing the predetermined condition is provided.

The remote monitoring device for equipment / device according to the second aspect of the present invention is the remote monitoring device of the first aspect, wherein the electric field strength from the base station and the number of frame errors are measured for a certain period of time, and the measured value for each base station is measured. An average value calculating means for calculating an average value of, and the average value of the electric field strength of the base station having the highest electric field strength among the base stations is a predetermined value or more, and the minimum value of the electric field strength of the base station is a specified value. Above, the first condition determining means for determining that the predetermined condition is satisfied when the average value of the number of frame errors is equal to or more than a certain value is provided.

The remote monitoring apparatus for equipment / device according to a third aspect of the present invention is the remote monitoring apparatus of the first aspect, wherein the electric field strength and the number of frame errors from the base station are measured for a certain period of time, and the measured value for each base station And an average value calculating means for calculating an average value of the electric field strengths from the base stations of a specified number or more and a predetermined value different from the predetermined value according to claim 2, and a minimum value of the electric field strength. If the average value of the number of frame errors is equal to or more than a prescribed value different from the prescribed value described in claim 2 and is equal to or greater than a prescribed value different from the prescribed value described in claim 2, it is determined that the prescribed condition is satisfied. Second condition determining means is provided.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. 1 to 4 are views showing an embodiment of the first to third inventions of the present invention, and FIG. 1 is an overall configuration diagram. 2 is a front view of the portable communication device, FIG. 3 is a content diagram of the measurement result storage memory of FIG. 2, (A) shows measured values,
(B) is the calculation result after measurement, and FIG.
It is a flowchart of the extinguishing operation, in which the same reference numerals indicate the same parts.

In FIG. 1, reference numeral 1 is equipment / device which is a target of the remote monitoring apparatus, and 2 is a telemetering PHS (hereinafter referred to as a portable communication device), which is connected to the equipment / device 1 via a communication device 3. ing. Reference numeral 4 is a low-power base station near the portable communication device 2, and 5 is a high-power base station far away from the portable communication device, each of which is connected to the center device via the public network 6. There is.

In FIG. 2, reference numeral 11 denotes a communication control unit having a function of executing communication with the equipment / device 1 via the communication device 3 and communication with the center device 7 via the base stations 4, 5 and the public network 6, and 12 Is a judgment indicator light indicating whether or not this place is suitable for installation, and 13 is a switch for setting condition values for judging whether or not installation is possible. The respective settable condition values are shown below.

(1) Minimum value of average electric field strength for condition 1 Maximum value of minimum electric field strength Maximum value of frame error average value (2) Base having minimum value of average electric field strength of minimum value of condition 2 for condition 2 or more The maximum value of the average value of the frame error of the base station with the lowest value of the average electric field strength of the number of base stations (3) Condition 1 and condition 2 common measurement time (it should be at least 10 minutes or more)

Reference numeral 14 denotes a measurement result storage memory that stores the results of measuring the radio waves from the base stations 4 and 5 for a plurality of times and the results of calculating the average value. The portable communication device 2 calculates an average electric field strength for each of the base stations 4 and 5, a minimum electric field strength for each of the base stations 4 and 5, and a frame error average value for each of the base stations 4 and 5 based on the measured values. It has a function.

Next, the operation of this embodiment will be described with reference to FIG. In step S1, the portable communication device 2 is placed at the place where it is desired to be installed and the power is turned on. In step S2, the portable communication device 2 measures ambient radio waves, and in step S3,
As shown in (A), the electric field strength and the frame error are stored in the memory 14 for each of the base stations 4 and 5. Step S4
Then, it is determined whether or not the set measurement time has elapsed. If it has not elapsed, the process returns to step S2, the measurement is continued, and if the measurement time elapses, the process proceeds to step S5.

At step S5, as shown in FIG.
The electric field strength average value, the electric field strength minimum value, and the frame error average value are calculated for each of the base stations 4 and 5. In step S6, each condition value set by the switch 13 is read. In step S7, first, as condition 1, the average value of the electric field strengths of the base stations 4 and 5 having the highest electric field strength is a predetermined value or more, the minimum value of the electric field strengths of the base stations 4 and 5 is a predetermined value or more, and the frame It is determined whether or not the average value of the number of errors is a certain value or more, and if the condition 1 is satisfied, the process proceeds to step S8, the determination indicator lamp 12 is turned on, and the process returns to step S1.

If the condition 1 is not satisfied, the process proceeds to step S9, and as the condition 2, the electric field strength from the base stations 4 and 5 is less than the specified value of the condition 1, but the specified number or more from the base stations 4 and 5 are received. The average value of the electric field strength is equal to or higher than a predetermined value different from the condition 1, the minimum value of the electric field strength is equal to or higher than a prescribed value different from the condition 1, and the average value of the number of frame errors is different from the condition 1. Is equal to or greater than a certain value, and if the condition 2 is satisfied, the process proceeds to step S8, the determination indicator lamp 12 is turned on, and the step S
Return to 1. If neither step S7 nor step S9 is satisfied, the process proceeds to step S10, the determination indicator lamp 12 is turned off, and the process returns to step S1.

The above-mentioned condition values are defined as follows. Predetermined value> another predetermined value, specified value> another specified value, constant value> another fixed value

As shown in FIG. 1, in an environment in which a low-power base station 4 near and a high-power base station 5 at a distance are visible, the maximum values of the electric field strengths of both are almost the same. Will end up. However, the high-powered base station 5 located far away may have unstable radio wave strength because it is far away.
By determining the average value of the electric field strength measured for 0 minutes or more and the number of frame errors, it can be determined whether or not it is stable.

Although the electric field strength from the low-power base station 4 located nearby is measured as a low value, the radio wave is actually stable and the success rate of communication may be high. Even if the electric field strength is low, a plurality of base stations 4 and 5 can be seen.
The determination is made by providing the condition of the average value of the number of frame errors. Further, the predetermined value, the prescribed value, and the constant value of each condition can be changed by setting the switch 13, and can be set according to the failure rate of the communication device 3 and the center device 7 to be connected.

Here, steps S1 to S5 constitute an average value calculating means, steps S6 and S7 constitute a first condition determining means, and steps S6 and S9 constitute a second condition determining means.
In this way, the portable communication device 2 is provided with the determination indicator lamp 12 for displaying the availability of installation. Therefore, it is not necessary to prepare the measuring instrument 23, and it is possible to easily determine the availability of the installation place of the portable communication device 2. Is possible. Further, since the possibility of installation is determined based on the average value of the electric field strength, the minimum value of the electric field strength, and the average value of the number of frame errors, it is possible to make an accurate judgment in consideration of the stability of the radio wave. As a result, it is possible to reduce the number of installations in a place where many failures occur during actual communication.

[0022]

As described above, according to the first aspect of the present invention, the portable communication device is provided with the determination indicator lamp to display whether the electric field strength from the base station and the number of frame errors satisfy predetermined conditions. Further, since the manually operated switch is provided so as to change the predetermined condition, it is possible to easily determine whether or not the portable communication device is installed at the installation place without preparing a measuring device.

In the second invention, the electric field strength and the number of frame errors from the base station are measured for a certain period of time, the average value of the measured values for each base station is calculated, and the electric field strength of the base station having the highest electric field strength is calculated. , The minimum value of the electric field strength of the base station, and the average value of the number of frame errors are used as the conditions for judging the installation location of the portable communication device, so an accurate judgment considering the radio wave stability is made. You can

In the third invention, the electric field strength from the base station and the number of frame errors are measured for a certain period of time, the average value of the measured values for each base station is calculated, and the electric field strength from the base stations equal to or more than a specified number is calculated. Since the condition for judging the feasibility of the installation location of the portable communication device is based on the average value of the above, the minimum value of the electric field strength, and the average value of the number of frame errors, it is possible to make an accurate judgment considering the stability of the radio wave. it can.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a front view of the portable communication device of FIG.

FIG. 3 is a content diagram of the measurement result storage memory of FIG.
(A) is a measured value, (B) is a calculation result after measurement.

FIG. 4 is a flowchart showing the operation of turning on / off the determination indicator lamp according to the first embodiment of the present invention.

FIG. 5 is a front view of a portable communication device and a measuring device showing a conventional remote monitoring device for equipment and devices.

[Explanation of symbols]

1 Equipment / equipment, 2 Portable communication device (PHS for telemetering), 3 Communication device, 4, 5 Base station, 6
Public network, 7 center device, 11 communication control unit,
12 judgment indicator lamp, 13 switch, 14 measurement result storage memory. S1 to S5 average value calculation means, S6
S7 first condition determining means, S6, S9 second condition determining means.

Claims (3)

[Claims] 1. A device for collecting data of facilities or equipment by a portable communication device, wirelessly communicating the data to a base station, and transmitting the data to a center device installed at a remote place, wherein A remote facility / equipment characterized by being provided with a judgment indicator light for indicating whether the electric field strength from the base station and the number of frame errors satisfy a predetermined condition, and a switch for manually changing the above predetermined condition. Monitoring equipment. 2. An average value calculating means for measuring the electric field strength and the number of frame errors from the base station for a certain period of time, and calculating an average value of the measured values for each of the base stations, and the most electric field strength of the base stations. If the average value of the electric field strength of the high base station is higher than or equal to a predetermined value, the minimum value of the electric field strength of the base station is equal to or higher than a specified value, and the average value of the number of frame errors is equal to or higher than a predetermined value, the predetermined condition is satisfied. The facility according to claim 1, further comprising a first condition determining means for determining that the condition is satisfied.
Equipment remote monitoring device. 3. An average value calculating means for measuring the electric field strength and the number of frame errors from the base station for a certain period of time and calculating an average value of the measured values for each of the base stations; The average value of the electric field strength is not less than a predetermined value different from the predetermined value described in claim 2, the minimum value of the electric field strength is not less than the specified value different from the specified value described in claim 2, and the number of frame errors is The facility / equipment according to claim 1, further comprising: second condition determining means for determining that the predetermined condition is satisfied if the average value is equal to or more than a constant value different from the constant value according to claim 2. Remote monitoring device.