JP3241612B2 - Data collection system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data collection system, and more particularly to a data collection system in a 1: n type monitoring system including one central unit and a plurality of terminal units.

[0002]

2. Description of the Related Art Conventionally, in this type of data collection system, as shown in FIG.
In a system composed of -1 to 4-m, a polling method in which a plurality of terminal devices 4-1 to 4-m are individually called from a central device 3 is mainly used. In addition, 1
The central device 3 and the plurality of terminal devices 4-1 to 4-m include data transmission units 31, 42-1 to 42-m and data reception units 32, 41-1 to 41-m, respectively.

In the above-mentioned polling method, since a plurality of terminal devices 4-1 to 4-m are sequentially polled, it is assumed that a certain terminal device has to send urgent information such as an alarm. Cannot transmit the information until the turn comes.

Therefore, in addition to the above system configuration, an interrupt control unit is incorporated in the system, and when the interrupt control unit receives an interrupt signal from any of a plurality of terminal devices, it notifies the central unit that there is an interrupt request. Then, there is a method in which the central device polls the terminal device. A data collection method using this interrupt is disclosed in
There is a technique disclosed in Japanese Patent No. 16890.

[0005]

In the above-mentioned conventional data collection method using polling, since the central unit polls a plurality of terminal units in order, it takes time to collect data from all terminal units. It will increase in proportion to the increase in equipment.

In the above polling system, the number of terminal devices that can be accommodated in the system is determined by the data communication speed and the practical response time. Therefore, in a system that requires a high-speed response, the data communication speed is high. It is necessary to reduce the number of terminals.

Further, in the above-mentioned polling method, when the number of terminal devices constituting the system is large, the central device tends to be large according to the number of terminal devices, and the system tends to be expensive.

Further, in the data collection method using the above-mentioned interrupt, data can be quickly collected from a terminal device which needs to send urgent information, but at the same time, an interrupt signal is sent from a plurality of terminal devices. If it occurs, it cannot be dealt with.

Therefore, an object of the present invention is to solve the above-mentioned problems, and to reduce the processing time of the emergency data collection even when a plurality of terminal devices simultaneously request urgent data transmission. It is to provide a system.

[0010]

A data collection system according to the present invention is a data collection system for collecting data from a plurality of terminal devices by periodically transmitting a polling signal from a central device to the plurality of terminal devices. Interrupt signal transmission means provided in each of the plurality of terminal devices and transmitting an interrupt signal indicating that the user wants to transmit the data to the central device; and provided in the central device and corresponding to each of the plurality of terminal devices. Communication permission means for sequentially granting communication permission to the plurality of terminal devices which have transmitted the interrupt signal simultaneously when the interrupt signal is transmitted from the interrupt signal transmission means; and It is and wherein the plurality of end to the all of the plurality of terminal devices after the communication permission unit gave the first communication permission
Use the polling function of each device as it is
Transmitting means for transmitting an emergency polling signal for collecting data to be notified urgently, and the terminal device to which the communication permission means has given the communication permission responds to the emergency polling signal to the central device. The data is sent.

That is, in the data collection system of the present invention, a data transmitting unit for performing data communication with a plurality of terminal devices via a logical communication line, a data receiving unit, and a request to transmit data from the terminal devices are received. A central unit comprising an interrupt signal detecting unit, a communication permitting signal transmitting unit for transmitting a signal for permitting data transmission to only one terminal device, and data for data communication with the central unit via a logical communication line A transmitting unit, a data receiving unit, and an interrupt signal transmitting unit that notifies a request to transmit data to the central device;
The communication device includes a communication permission signal detection unit that receives a data communication permission signal transmitted from the central device, and a terminal device group that includes the respective devices.

The central unit and the terminal unit collect data not only by regular polling using the data transmitting unit and the data receiving unit but also by emergency polling. Emergency polling is polling performed by interruption from a terminal device, and performs the following operation. That is, 1) the terminal device transmits an interrupt request signal from the interrupt transmitting unit when urgently transmitting data to the central device. 2) The central device detects the interrupt signal from the terminal device by the interrupt signal detecting unit. The communication permission signal transmitting unit immediately transmits a signal indicating communication permission to only one terminal device. 3) Thereafter, the central device performs polling (emergency polling) for all terminal devices. Only when the communication permission signal from the central unit is detected by the communication permission signal detecting unit, responds to the urgent polling for all terminal devices. 5) The central device permits communication until there is no interrupt request from the terminal device. Emergency polling other than periodic polling is performed by repeating the procedure of sending a signal indicating that the emergency polling is performed.

Thus, even when a plurality of terminal devices request urgent data transmission at the same time, it is possible to reduce the processing time for collecting the urgent data.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment of the present invention. In the figure, a data collection system according to one embodiment of the present invention includes one central device 1,
It comprises a plurality of terminal devices 2-1 to 2-n,
Between the central unit 1 and the plurality of terminal units 2-1 to 2-n, data communication lines 101 and 102 and an interrupt signal line 103-
1 to 103-n and communication permission signal lines 104-1 to 104
-N.

The central unit 1 comprises a data transmission unit 11, a data reception unit 12, an interrupt signal detection unit 13, and a communication permission signal transmission unit 14. Terminal devices 2-1 and 2-2
-N are data transmitting units 21-1 to 21-n, data receiving units 22-1 to 22-n, and an interrupt signal transmitting unit 23-n.
1 to 23-n and communication permission signal detection units 24-1 to 24-
n. The terminal devices 2-1 to 2-n
Addresses # 1 to #n are assigned to each of them in advance.

The central unit 1 and a plurality of terminal units 2-1 to 2-
Data collection by polling is performed periodically using the data communication lines 101 and 102 with n. When there is an interrupt signal from the terminal devices 2-1 to 2-n to the central device 1, the central device 1 performs data collection by emergency polling.

The following operations are performed in the emergency polling. 1) When the terminal devices 2-1 to 2-n want to urgently transmit data to the central device 1, the interrupt signal transmitting units 23-1 to 23-23
Send an interrupt signal from -n.

2) The central unit 1 is the terminal units 2-1 to 2-n
When the interrupt signal detecting unit 13 detects the interrupt signal from the terminal device 2, the communication enable signal transmitting unit 14 immediately transmits a communication enable signal indicating that the communication is allowed to only one of the terminal devices 2-1 to 2-n.

3) Thereafter, the central device 1 performs polling (emergency polling) for all the terminal devices 2-1 to 2-n.

4) The terminal devices 2-1 to 2-n are the central unit 1
From the communication permission signal detectors 24-1 and 24-2.
4-n, and responds to the emergency polling from the central unit 1 only when it is determined that the communication permission has been given.

5) When a response is made to the emergency polling, the central unit 1 receives an ACK (acknowledge).
A terminal device that sends out a signal and responds to the emergency polling 2-
The user is prompted to turn off the interrupt signals 1-2-n.

6) Terminal 2 responding to emergency polling
When the ACK signal is received from the central unit 1, the interrupt signals are turned “OFF”.

7) The central unit 1 is the terminal units 2-1 to 2-n
The operations of the items 2) to 6) are repeated until there is no interrupt request from.

8) The central unit 1 is the terminal units 2-1 to 2-n
When there is no longer an interrupt signal from, the routine returns to the regular polling operation.

FIG. 2 is a timing chart showing the operation of one embodiment of the present invention. The operation of the embodiment of the present invention will be described with reference to FIGS. In the embodiment of the present invention, it is assumed that the terminal devices 2-1 and 2-n simultaneously generate an interrupt signal.

The data transmission section 11 of the central unit 1 periodically transmits a polling signal to the plurality of terminal units 2-1 to 2-n via the data communication line 101. Each of the plurality of terminal devices 2-1 to 2-n has a data receiving unit 22-1 to 22.
When the polling signal from the central unit 1 is received at −n,
From the data transmission units 21-1 to 21-n to the data communication line 1
02, the data collected by the own device is transmitted. The central device 1 receives data transmitted from each of the plurality of terminal devices 2-1 to 2-n via the data communication line 102 in the data receiving unit 12, and performs data collection.

For example, from the central unit 1 to the data communication line 1
01, 102, terminal device 2-5 at address # 5
(Not shown) will be polled,
The terminal device 2-5 having the address # 5 returns a response signal to the central device 1 in response to the polling signal from the central device 1.

While the terminal device 2-5 having the address # 5 is responding to the polling signal from the central unit 1, the terminal device 2-1 having the address # 1 and the terminal device 2 having the address #n are in response.
If the data to be notified urgently occurs at -n,
The terminal device 2-1 of the address # 1 is connected to the interrupt signal transmitting unit 23.
-1 is notified to the interrupt signal detection unit 4 of the central device 1 via the interrupt signal line 103-1.

Further, the terminal device 2-n at the address #n also receives the interrupt signal signal 103-n from the interrupt signal transmitting section 23-n.
The interrupt signal is notified to the interrupt signal detection unit 4 of the central device 1 via n.

The central unit 1 searches the interrupt signal detected by the interrupt detecting unit 13 and finds the terminal device 2-1 at address # 1.
Then, after transmitting a communication permission signal from the communication permission signal transmitting unit 14 via the communication permission signal line 104-1, the controller performs emergency polling. The emergency polling is performed to collect data to be notified urgently by using the polling function provided in each of the terminal devices 2-1 to 2-n as it is.

When the communication permission signal detecting section 24-1 detects the communication permission signal from the central apparatus 1, the terminal apparatus 2-1 having the address # 1 receives the emergency polling from the central apparatus 1 and transmits the data to the data transmitting section 21-1. Sends a response signal.

When the central unit 1 receives a data response from the terminal unit 2-1 having the address # 1 in response to the emergency polling, the central unit 1 subsequently transmits an ACK signal, and the terminal unit 2 which has responded to the data responds.
The user is prompted to turn off the interrupt signal of "1".

Terminal device 2-1 responding to emergency polling
When the ACK signal is received from the central unit 1, the interrupt signal sent from the interrupt signal sending unit 23-1 is changed to "OF".
F ".

Since the interrupt signal detector 13 of the central unit 1 continuously detects the interrupt signal from the terminal device 2-n at the address #n, the communication enable signal is transmitted to the terminal device 2-n at the address #n. Communication permission signal line 104 from unit 14
After sending the communication permission signal via -n, the emergency polling is performed.

When the terminal device 2-n of the address #n detects the communication permission signal from the central device 1 by the communication permission signal detecting portion 24-n, the data transmitting portion 21-n responds to the emergency polling from the central device 1. Sends a response signal.

When receiving a data response from the terminal device 2-n having the address #n in response to the emergency polling, the central device 1 subsequently sends an ACK signal to the terminal device 2-n which has responded to the data.
The user is prompted to turn off the n interrupt signal.

Terminal 2-n responding to emergency polling
When the ACK signal is received from the central unit 1, the interrupt signal sent from the interrupt signal sending unit 23-n is set to "OF".
F ".

In the central unit 1, the above-mentioned emergency polling is performed until the interrupt signal detecting unit 13 detects no interrupt signal from the terminal devices 2-1 to 2-n. When the interrupt signal from 2-n is no longer detected, the process shifts to periodic polling.

As described above, the central unit 1 and the terminal unit 2-1
In addition to the conventional polling method, the time between collecting data from the terminal devices 2-1 to 2-n is greatly reduced by performing an emergency polling of an interrupt method in addition to the conventional polling method. You. In particular, the time required to collect data that needs to be notified of an emergency is greatly reduced.

Moreover, the terminal device 2 that can be accommodated in the system
The number of -1 to 2-n can be increased without impairing the speed of data collection. Therefore, the terminal device 2-1
Even a system having a large number of .about.2-n can be configured at a lower cost than in the past.

[0041]

As described above, according to the present invention, in a data collection system for collecting data from a plurality of terminal devices by periodically transmitting a polling signal from a central device to a plurality of terminal devices, A plurality of terminal devices each provided with an interrupt signal transmitting means for transmitting an interrupt signal indicating a desire to transmit to the central unit, and a plurality of terminals transmitting the interrupt signal when the interrupt signals are simultaneously transmitted from each of the plurality of terminal devices. Communication permission means for sequentially granting communication permission one by one to the device, and transmission means for transmitting an emergency polling signal to all of the plurality of terminal devices after the communication permission means has given the first communication permission to the central unit. The terminal device to which the communication permission means has given the communication permission transmits data to the central device in response to the emergency polling signal, so that a plurality of terminals can be transmitted. Even when there is a request for put et simultaneously urgent data transmission, there is an effect that it is possible to shorten the processing time of these emergency data collection.

[Brief description of the drawings]

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

FIG. 2 is a timing chart showing the operation of one embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Central apparatus 2-1 to 2-n Terminal apparatus 11, 21-1 to 21-n Data transmission part 12, 22-1 to 22-n Data reception part 13 Interrupt signal detection part 14 Communication permission signal transmission part 23-1 23-n Interrupt signal transmitting unit 24-1 to 24-n Communication permission signal detecting unit 101, 102 Data communication line 103-1 to 103-n Interrupt signal line 104-1 to 104-n Communication permission signal line

Claims (3)

(57) [Claims] 1. A data collection system for collecting data from a plurality of terminal devices by periodically transmitting a polling signal from a central device to the plurality of terminal devices, wherein the data collection system is provided in each of the plurality of terminal devices; Interrupt signal transmitting means for transmitting an interrupt signal indicating the desire to transmit the data to the central device; and the interrupt signal is simultaneously provided from the interrupt signal transmitting device provided in the central device and corresponding to each of the plurality of terminal devices. A communication permitting means for sequentially granting a communication permission to the plurality of terminal devices which have transmitted the interrupt signal when they are transmitted, and a communication permitting means provided in the central device and wherein the first communication permission is provided. It gave the plurality of to the all of the plurality of terminal devices after
Polling function provided for each terminal device
Transmitting means for transmitting an emergency polling signal for collecting data to be urgently notified , wherein the terminal device to which the communication permission means has given the communication permission responds to the emergency polling signal. A data collection system characterized in that data is sent to the data collection system. 2. A communication permission detecting means for detecting said communication permission from said communication permission means, and responding to said emergency polling signal from said transmitting means when said communication permission is detected by said communication permission detecting means. The data collection system according to claim 1, wherein each of the plurality of terminal devices includes a data transmission unit that transmits data of the own device to the central device. 3. The central unit operates the communication permitting unit and the transmitting unit until the interrupt signal from the terminal device disappears, and stops detecting the interrupt signal.
And the recurring claim 1 or claim 2 data acquisition system, wherein the constructed to so that for transition into the polling.