JPH0728298B2 - Data collection method - Google Patents

Description

The present invention relates to a data collection method in a 1: n type monitoring system for performing alarm monitoring in the same building or the like.

[Prior Art] FIG. 4 shows a conventional monitoring system of this type.

As shown in FIG. 4, a conventional monitoring system of this type is
A main central unit 1 having a data transmitting unit 1a and a data receiving unit 1b for data communication with a plurality of terminal devices 2 and 2 through logical communication lines 3 and 4, and a logical communication line 3;
4 is composed of a plurality of terminal devices 2 each having a transmitting unit 2a and a receiving unit 2b capable of communicating with the main central apparatus 1 through 4.

In this monitoring system, as a data collection method,
A polling method has been adopted in which the central device 1 calls each terminal device 2 individually.

[Problems to be Solved by the Invention] In the data collection by the conventional polling method described above, as the number of terminal devices increases, the scan timing for making a round around all the terminal devices becomes longer, and for example, alarm data collection such as disaster prevention and crime prevention is collected. Or, it took a long time to respond to the terminal on the man-machine interface. Therefore, as a measure to increase the data collection speed, the number of terminals was reduced, and one block was configured with a small number of terminals, or a means of speeding up the line speed was taken, but the system configuration is inevitably expensive. It was dead.

Further, in the conventional polling method, each terminal device is multi-branched into a line, and when the line connecting the terminals is disconnected, data collection from the terminal device after the disconnection line becomes impossible on the system. The problem was inherent.

[Means for Solving the Problem] An object of the present invention is to solve the problems of the above-mentioned conventional techniques and to provide a data collection method in which high-speed data collection can be performed safely.

The data collection method of the present invention comprises a main central device, a sub central device, and a plurality of terminal devices, and the main central device includes a data transmitting unit, a data receiving unit, and a terminal for data communication with the terminal device and the sub central device. It has an interrupt receiving circuit that receives a data transmission request from a device through a control line, and an interrupt prohibiting circuit that can inhibit this by a control line different from the above; the terminal device is for communicating with the central device. Of the main central unit detected by its own interrupt generation unit by receiving the interrupt from the lower terminal unit at the physical connection level by the transmission unit, the receiving unit, and the control line, and by prohibiting the interrupt from the upper terminal unit or the main central unit. Has a prioritized priority circuit that determines whether to generate an interrupt to a higher level in response to a data transmission request to the main central device; the sub central device is located at the opposite side of the main central device and connected to the main central device. Data receiver for the line to see if normal, the data transmission unit has a line switching unit, the interrupt generation unit, and the interrupt disabled receiver.

[Embodiment] Next, a data collection method of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a data collection system according to the present invention.

The main central device 1 has a data transmission unit 1a, a data reception unit 1b, an interrupt prohibition circuit 1c, and an interrupt reception circuit 1d. The terminal device 2 has a transmission unit 2a, a reception unit 2b, an interrupt generation unit 2c, and an advance priority circuit 2d. The sub central device 7 has a data receiving unit 7a, a data transmitting unit 7b, a line switching unit 7c, an interrupt generating unit 7d and an interrupt prohibiting receiving unit 7e.

The advance priority circuit 2d of the terminal device 2 is an interrupt signal of the terminal device connected to the lower order, or a signal from the interrupt generation unit 2c which becomes a signal "on" when data to be transmitted to the central device 1 from itself is generated. Whichever is entered first will be accepted.

If an interrupt from the lower device is accepted first by the interrupt control line 5, the signal from its own interrupt generation unit 2c is prohibited, while the signal from its own interrupt generation unit 2c is accepted first. If accepted, the interrupt prohibition control line 6 is used to stop the function of the advance priority circuit in the other terminal device 2.

In such a case, the central device 1 can be limited to only one terminal device 2 by the interrupt control line 5 and the interrupt prohibition control line 6 between the terminal devices 2.

Data is normally collected between the central device 1 and each terminal device 2 by the polling method using the communication lines 3 and 4. However, when an interrupt is generated by the interrupt control line 5, the central device 1 generates the interrupted terminal device 2 Perform interrupt polling without addressing to collect more data.

Even if polling is performed without addressing as described above, the interrupt control line 5 and the interrupt prohibition control line 6 limit the number of terminal devices 2 that generate an interrupt, so only the terminal device 2 that generated an interrupt It is possible to return response data.

When the central device 1 normally receives the data from the terminal device 2, it returns a confirmation signal (ACK) indicating this to the terminal device 2.

The terminal device 2 releases the interrupt-disabled state for the lower terminal device 2 in the internal advance priority circuit 2d by the confirmation signal from the central device 1.

In such a case, in the terminal device 2 which already wants to transmit data to the central device 1, the advance priority circuit 2d operates in the same manner as described above, and the terminal device 2 is limited to one and interrupts the central device 1.

Similarly, since the terminal in which the transmission data has occurred is specified and interrupt polling is performed, it is possible to collect data at a higher speed than a simple polling method.

The above timing is shown in FIG.

The central unit 1 and the sub central unit 7 are connected by the communication lines 3 and 4 with a plurality of terminal units 2 in between, and are also connected to the terminal unit 2 through the interrupt control line 5 and the interrupt prohibition control line 6.

When the polling call from the main central apparatus 1 does not arrive for a certain period of time, the sub central apparatus 7 determines that the communication lines 3 and 4 are disconnected, and controls the line switching unit 7c to perform a polling operation on the terminal device 2. To start.

The polling operation of the sub central device 7 is performed by the interrupt prohibition reception unit 7e.
When the "ON" signal is input to the terminal, the line switching unit 7c is controlled and the system for receiving the data from the main central unit 1 is set.

Further, when the main central unit 1 does not receive a response from the sub central unit 7, it judges that the communication line is disconnected and the communication line 3
To the terminal device 2, and the sub central device 7 instructs the terminal device 2 to start the polling operation.

Further, the main central unit 1 controls the interrupt prohibiting circuit 1c, periodically stops the polling operation of the sub central unit 7, and confirms whether the communication lines 3 and 4 have been restored.

The timing at this time is shown in FIG.

[Effects of the Invention] As described above, in the data collection method of the present invention, even if the communication line is disconnected by the main central unit or the sub central unit, either of the terminal units performs the polling operation. Data collection is done.

In the state where there is no disconnection in the communication line, in addition to the normal polling operation between the main central unit and the terminal unit, data communication by the interrupt method can be performed, and data collection at a higher speed than before can be done safely. It will be a matter.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a data collection system according to the present invention. 2 and 3 are timing charts showing the operation of FIG. 1, respectively. FIG. 4 is a block diagram of a conventional data collection method. 1 ... Main central unit, 2 ... Terminal unit 3,4 ... Communication line, 5 ... Interruption control line 6 ... Interruption prohibition control line

Claims (1)

[Claims] 1. A data transmitting unit for performing data communication with a plurality of terminal devices through a logical communication line, a data receiving unit, an interrupt receiving circuit for receiving a data transmission request from the terminal device through a control circuit, and the terminal device. From the main central unit having an interrupt prohibition circuit capable of prohibiting the fact that the user wants to transmit data through the control circuit via a control line different from the interrupt receiving circuit; can communicate with the main central unit through the logical communication line The transmitter, the receiver, and the control line receive interrupts from the lower-level terminal device at the physical connection level, and disable interrupts from the higher-level terminal device or the main central unit. A plurality of terminal devices having an advance priority circuit that determines whether or not to generate an interrupt to a host in response to a transmission data transmission request to the central device; , A data receiving unit for data communication with the main central unit, a data transmitting unit, a line switching unit, an interrupt prohibiting receiving unit which is one of the triggers for switching the line switching unit, and an auxiliary generating unit. Central device;
In the data collection method consisting of, the main central device collects the data generated by the terminal device by polling using a logical communication line, and the interrupt device also interrupts the data between the terminal devices to the central device. Is specified as one unit, and at the time of interrupt polling from the main central unit, the means for prohibiting only one terminal unit to respond by the control line and the logical line between the main central unit and the sub central unit are disconnected. In this case, the sub-central device has a means for automatically polling the terminal device.