JPH0693689B2 - Data collection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] In the present invention, in the same premises such as building, the central device collects data from terminal devices dispersedly arranged at various places, and based on this, The present invention relates to a data collection method for monitoring and controlling.

[Conventional technology]

Such a data collection method is composed of a central device and a plurality of terminal devices connected by a common transmission line to the central device, and the terminal designated by the central device transmits an individual polling signal. The device sends data,
This procedure is repeated for each terminal device.

[Problems to be Solved by the Invention]

However, if only individual polling signals are used, the number of terminal devices increases and the period for collecting data from all terminal devices is extended by individual polling signals, resulting in a long response time for man-machine interface operations. Therefore, there is a problem of lack of responsiveness.

As a countermeasure against this, although one block is configured by limiting the number of terminal devices, a plurality of blocks are used, or means for increasing the signal transmission speed is adopted, in any case, It has the drawback of being generally expensive.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, the present invention comprises the following means.

That is, in the above-described data collection method, it is determined which of the own interrupt signal and the interrupt signal from another terminal device has priority, and the priority interrupt signal is transmitted to the central device, and the serial transmission line Each terminal device is provided with a start-up priority circuit that is cascaded with each other, and the central device transmits an interrupt prohibition signal that prohibits the transmission of a new interrupt signal according to the received interrupt signal, and The interrupt polling signal is transmitted, and the terminal device that is the source of the interrupt signal transmits data according to the interrupt polling signal.

[Action]

Therefore, only the terminal device that has transmitted the highest priority interrupt signal is allowed to transmit data, so when data to be transmitted occurs, the data can be transmitted promptly without receiving the individual polling signal. The required data is collected at high speed.

〔Example〕

Hereinafter, the details of the present invention will be described with reference to the drawings illustrating examples.

FIG. 1 is a block diagram, and FIG. 2 is a timing chart showing signal transmission status. In FIG. 1, a central device (hereinafter, CE) 1 and a plurality of terminal devices (hereinafter, TE) 2 _{1 to} 2n are shown. And CE are connected by common transmission lines 3 and 4, and CE1 has a transmitter (hereinafter, TX) 11, a receiver (hereinafter, RX) 12, an interrupt prohibit circuit (hereinafter, INH) 13, and an interrupt. Receiver circuit (hereafter INT)
14 are provided, while TE2 _{1 to} 2n have TX21 ₁ to 2n respectively.
1n, RX22 _{1 to} 22n, interrupt generation part (hereafter INTG) 23 _{1 to} 23n,
And, starting priority circuit (hereinafter, PRO) is provided with a 24 ₁ ~24n, PRO24 ₁ ~24n the other TE and CE1 series transmission line 5,
Cascaded by 6.

In thisゝ, CE1 of TX11, each TE2 ₁ to 2 by a constant period
The TE2i that sent the individual polling signal that sequentially specifies n and received it by the RX22i is supposed to send the data by the TX21i, and this data is received by the RX12 of CE1. Each TE2 _{1 to} 2n is sequentially and repeatedly performed.

However, when data to be transmitted immediately occurs in any of TE2j, INTG23j of TE2j sends an interrupt signal and gives it to PRO24j, which sends an interrupt signal to CE1 via serial transmission line 5. It is supposed to be sent.

This interrupt signal is being sequentially relayed to CE1 via a respective PRO24j _-1 ~PRO24 ₁ of TE2j _-1 ~TE2 _1, each PRO24 ₁ ~24n
Is according to whether the interrupt signal even INTG23n～INTG23 ₁ self occurs, Wakashi, which when occurring, with the interrupt signal from its interrupt signal and other TE2j It is decided that which comes first, and the one that comes first is sent preferentially, and only this preferential interrupt signal is sent to INT14 of CE1.

This situation is as Figure 2, when the polling P ₁₄ is sent to the TE2 ₁₄ by a transmission (a) according to the transmission path 3,
The transmission (b) by the transmission line 4 causes the TE2 ₁₄ to transmit the data D ₁₄ , and when the TE2 ₅ immediately generates data to be transmitted, the serial transmission line 5
The transmission signal (c) by PRO transmits the interrupt signal IT ₀₅ from PRO 24 ₅ , and when this is received by INT14 of CE1, INT13 immediately transmits the interrupt prohibition signal IH by transmission (d) by serial transmission line 6. to order this is PRO24 ₁ ~PRO2 each TE2 ₁ to 2n
When it is received by 4j, the transmission of a new interrupt signal is prohibited in each TE2 _{1 to} 2n, and after this, transmission (a)
By the reception of the interrupt polling signal P ₀₀ to be transmitted from TX11, TE2 ₅ which is the source of the interrupt signal IT ₀₅ sends data D ₀₅ by the transmission (b).

Then, in response to the reception of this, CE1 transmits the response signal ACK by transmission (a), so that by receiving this, each TE2 _{1 to} TE2n
Then, the transmission prohibited state of the new interrupt signal is released.

Next, TE2 immediately if the data is generated to be transmitted in the _3, transmission of the interrupt signal IT ₀₃ in the same manner as described above, transmission of the interrupt disable signal IH and the interrupt polling signal P ₀₀ Ozuru thereto,
Accordingly, the data D ₀₃ is transmitted and the response signal ACK is transmitted in response to the reception of the data D ₀₃ .

Further, if the generated data to be transmitted immediately even during this time TE2 _8, transmission of the interrupt signal IT ₀₈ based on this, which is performed in response to release of the interrupt disabled state by the interruption signal IT ₀₃ After that, as in the above, the interrupt disable signal TH and interrupt polling signal _P00 are transmitted, and the data D
₀₈ transmission and response signal ACK transmission are sequentially performed,
After transmission inhibited state release of the interrupt signal, then returns to the normal polling operation, transmission of the signal P _15, behind the first individual polling signal P ₁₄ is performed.

Therefore, when data that should be transmitted immediately occurs in any TE2j, and when any TE2j, 2k
When the same data occurs at almost the same time in, in any case, only one interrupt signal is received at CE1, and the interrupt disable signal and interrupt polling signal are transmitted. Only TEj that transmitted the interrupt signal will be allowed to transmit data,
Since data that requires is transmitted immediately to the CE1, collecting the required time for data requiring overall high responsiveness is reduced without limiting the particular TE2 ₁ ~TE2n the number.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, while transmitting an interrupt signal from each terminal device as necessary,
It is assumed that only the highest priority interrupt signal can be received by the central device, and accordingly, the central device transmits the interrupt prohibition signal and the interrupt polling signal, and the data from the terminal device that transmitted the highest priority interrupt signal. By allowing only the transmission, the responsiveness is generally improved and a remarkable effect is obtained in collecting data for various purposes, without limiting the number of terminal devices and speeding up signal transmission.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, FIG. 1 is a block diagram, and FIG.
The figure is a timing chart showing the signal transmission status. 1 ...... central unit, 2 ₁ to 2n ...... terminal, 3,4 ...... transmission path, 5,6 ...... serial transmission line, 11 and 21 ₁ 21n ...... transmitting section, 12, 2
2 _{1 to} 22n …… Reception unit, 13 …… Interrupt prohibition circuit, 14 …… Interrupt reception circuit, 24 _{1 to} 24n …… Starter priority circuit, IT ₀₃ , IT ₀₅ , IT ₀₈
…… Interrupt signal, P ₀₀ …… Interrupt polling signal, IH …… Interrupt prohibition signal, D ₀₃ , D ₀₅ , D ₀₈ , D ₁₄ …… Data.

Claims (1)

[Claims] 1. A central device and a plurality of terminal devices connected to the central device by a common transmission line, wherein each of the terminal devices transmits data in response to an individual polling signal from the central device. In the data collection method, it is determined which of the own interrupt signal and the interrupt signal from the other terminal device has priority, and the priority interrupt signal is transmitted to the central device and connected in series by the serial transmission line. An advanced priority circuit is provided for each of the terminal devices, and the central device transmits an interrupt prohibition signal that prohibits the transmission of a new interrupt signal in response to the received interrupt signal, and also transmits an interrupt polling signal. A data collection method, wherein the terminal device that is the source of the interrupt signal transmits data in response to the interrupt polling signal.