JP2535015B2 - Transmission control method for one-way signal transmission system - Google Patents

Description

Description: TECHNICAL FIELD The present invention comprises a plurality of slave units and a master unit, and one-way signal transmission for monitoring the operating state of a load and transmitting a monitoring output from the slave unit to the master unit. The present invention relates to a system transmission control method.

[Background Art] A one-way signal transmission system, which is composed of a plurality of slave units and a master unit and monitors the operating state of a load and sends a monitoring output from the slave units to the master unit, is used in security systems and the like. . As this security system, as shown in FIG. 4, there is a security system which is used for detecting the opening and closing of a normal manual door or an automatic door so as to prevent the door from being left open and to respond to visitors. . This door open / close detector is a sensor that detects the open / close state of each of the bad doors C _{1 to} Cn.
1 _{1 to} 1n and a monitoring device such as an open / close detection switch (in the following description, it is assumed that a sensor is used as a monitoring device), and the monitoring output of each sensor 1 _{1 to} 1n is transmitted to the slave unit B ₁ ...
One-way signal transmission from Bn to parent device A was performed.

In such a conventional one-way signal transmission system, when the opening and closing of the door C ₁ by the sensor 1 ₁ corresponding to the example slave unit B ₁ is detected as shown in FIG. 5 (a), the sensor 1 ₁ The detection outputs were all transmitted to the master unit A according to the rising and falling edges of the output of FIG. In this case, there is an advantage that the master unit A can notify the open / closed state of the door C ₁ almost in real time.
When the frequency of opening and closing C ₁ is high, the frequency of signal transmission of the child device B ₁ and the reception processing of the parent device A are also high, and therefore power consumption increases. Therefore, for example, in the case of using a battery as a power source, there is a problem that the life of the battery is shortened. Moreover, from sending from a plurality of slave unit B ₁ to Bn detection output by the sensor 1 ₁ 1n the main unit A, occur when simultaneously performing transmission from one of the plurality of slave unit B ₁ to Bn As a result, the transmission signals may affect each other and the signals may not be transmitted, which may cause a false alarm.

Therefore, as shown in FIG. 6, a delay time X of a predetermined time is provided after the sensor 1 detects that the door C has been opened, and an opening signal indicating that the door C has been opened from the slave B, for example.
Even if the next open signal S ₁ occurs within the delay time X after S ₁ is transmitted, this open signal S ₁ is not transmitted to the master unit A. The closing signal S ₂ indicating that the door C is closed is not transmitted to the master device A within the delay time X, but the closing signal S ₂ is transmitted after the delay time X has elapsed. When the open signal S ₁ occurs within the delay time X,
Each time the open signal S ₁ is generated, the previous delay time X is cleared and a new delay time X is set. In other words, when the door opening / closing detection device is used, such as knowing that there is a visitor from the notification output of the door opening / closing detection device,
In many cases, it is not necessary to further notify that the door C has been opened within a predetermined time after the notification that the door C has been opened. Therefore, in this case, unnecessary detection output of the sensor 1 is not transmitted. In this way, the frequency of transmission of the detection output by the child device B is reduced. However, in this case,
When the door C is continuously opened within the delay time X, the closing signal S ₂ indicating that the door C is closed is output until the delay time X of the final opening signal S ₁ elapses. Since it is not transmitted to the container A, it is impossible to distinguish between the case where the door C is left open for a long time and the case where the door C is continuously opened and closed, and the door C is left open. The status may not be transmitted to the master device A, which may cause a problem in terms of crime prevention.

Therefore, in applications where signal transmission reliability is conventionally required, a bidirectional signal transmission system is used,
The parent device A individually calls each child device B, and the called child device B transmits the monitoring output to the parent device A. However, in this case, there is a problem that the configuration becomes complicated and the transmission frequency becomes high.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a one-way signal with low transmission frequency, capable of reliably transmitting necessary information, and having a simple configuration. It is to provide a transmission control method for a transmission system.

DISCLOSURE OF THE INVENTION (Structure) The present invention includes a monitoring device that monitors an operating state of a load that completes one operation when a certain operating state changes to another operating state, and transmits a monitoring output of the monitoring device. It is equipped with a plurality of slave units and a master unit which receives a signal from the slave units and detects and notifies an operating state of the load or an abnormality in the load operation, and the first one detected by the monitoring device. When an operating state that constitutes an operation is transmitted from the slave unit to the master unit, and when the load operates in the first predetermined time from this one operation, the operation time of this load is set to the second predetermined time shorter than the first predetermined time. As compared with the time, when the operation time is shorter than the second predetermined time, the monitor output indicating the operation is not transmitted from the slave unit, and when the operation time is longer than the second predetermined time, the first predetermined time Sends the operating status of the internal load from the slave unit Therefore, even if the load operates in the first predetermined time after the first operation, if the operation is completed within the second predetermined time, the monitoring output of this operation is not transmitted from the slave unit to the master unit. As a result, the transmission frequency of the slave unit is reduced to prevent information from being lost, and even if the load operates within the first predetermined time, the load operating time Is necessary information that leads to an abnormal state of the load operation, such as is longer than the second predetermined time,
By transmitting the monitoring output according to this operation from the slave unit to the master unit, the necessary information can be surely transmitted to the master unit.

(Embodiment) FIGS. 1 to 3 show an embodiment of the present invention. Also in this embodiment, a plurality of slave units B that transmit the output of the monitoring device such as the sensor 1 that detects the opening and closing of the door C, and a master unit that receives a transmission signal from the slave units B and notifies the open / closed state of the door C. It consists of A and. The signal transmission between the child device B and the parent device A may be wireless or wired.

The operation of this embodiment will be described below with reference to FIGS. Note that FIG. 3 is a flowchart showing the same operation. In the present embodiment, an operating state that constitutes one initial operation detected by the sensor 1, that is, a state in which the door C that constitutes the opening / closing operation of the door C is opened in the door opening / closing detection apparatus according to the present embodiment, The detection output of the sensor 1 indicating the closed state is transmitted from the child device B to the parent device A. First
In FIG. 2A and FIG. 2A, the door C by the sensor 1 is shown.
When the sensor 1 detects the opening / closing operation of the door C for the first time as shown in the left end of (a) of both figures, it is shown in the left end of (f) of the same figure. Then, an open signal S ₁ indicating that the door C is opened and a close signal S ₂ indicating that the door C is closed are transmitted from the slave B to the master A. In addition, in the present embodiment as well, from the above-described operation,
The first predetermined time X corresponding to the delay time in the case shown is provided, and even if the door C is opened / closed within this first predetermined time X, in principle the monitoring output is transmitted to the master device A. I try not to. That is, as shown in FIG. 3, the time when the door C is opened / closed (the time from the time when the door C is closed to the time when the door C is next opened) x Compared with the predetermined time X, if this time x is within the first predetermined time X, in principle, the detection output of the sensor 1 is not transmitted from the slave unit B. In this embodiment,
Although the first predetermined time X is set to a fixed time after the door C is closed, it may be set to a fixed time after the door C is opened. That is, as in the case of the conventional example, when the door opening / closing detection device is used such that the presence of a visitor is known from the notification output of the door opening / closing detection device, it is notified once that the door C is opened. In many cases, it is not necessary to notify that the door C has been opened within a later predetermined time.
The detection output of 1 is not transmitted, and the frequency of transmission of the detection output by the child device B is reduced. But,
In this case, for example, an abnormal state in which the door C is left open for a long time cannot be transmitted to the master device A. Therefore, in the present embodiment, when the door C is opened / closed within the first predetermined time X of FIGS. 1 (b) and 2 (b) from the first opening / closing operation (shown by a in the figure), The opening / closing operation time (indicated by y in FIG. 3) of the door C is compared with a second predetermined time Y shorter than the first predetermined time X, and when this operation time is shorter than the second predetermined time Y. , The monitoring output indicating this operation is not transmitted from the slave B to the master A, and when this operation time is longer than the second predetermined time Y (indicated by B in the figure),
The opening / closing operation state of the door C within the first predetermined time X is transmitted from the slave B to the master A as shown in FIG. That is, even if the door C is opened / closed in the first predetermined time X after the first opening / closing operation, if the opening / closing operation time of the door C is completed within the second predetermined time Y, the monitoring output of this operation state is obtained. By not transmitting from the child device B to the parent device A, the transmission frequency of the child device B is reduced in the same manner as in the conventional example of FIG. 6 so that information loss due to duplication of transmission is less likely to occur. In the present embodiment, when the door C is opened and closed within the first predetermined time X, the previous first predetermined time X is cleared every time the door C is closed and a new first predetermined time is newly set. X is set. Further, if the necessary information is such that even if the door C is opened / closed within the first predetermined time X, the opening / closing operation time of the door C is equal to or more than the second predetermined time Y, which leads to an abnormal operation state. In addition, the open signal S ₁ is transmitted from the slave B to the master A after the elapse of the second predetermined time Y, and necessary information can be transmitted to the master A without fail. As a result, the parent device A can notify that the door C is in the open state and the like, and there is no trouble in crime prevention as in the conventional example of FIG. In the present embodiment, the transmission time of the open signal S ₁ is delayed by the second predetermined time Y, but the second predetermined time Y is a short time, so this delay does not cause any problem. In addition, as shown in Fig. 2 (a), opening and closing of the door C (shown by C in the figure), the previous door C is opened.
When it occurs after the first predetermined time X has elapsed from the opening / closing of the above, both the open signal S ₁ and the close signal S ₂ are transmitted from the slave B to the master A as in the first opening / closing operation.

[Effects of the Invention] As described above, the present invention includes a monitoring device that monitors the operating state of a load that completes one operation when one operating state changes to another operating state, and transmits the monitoring output of the monitoring device. It is equipped with a plurality of slave devices and a master device that receives a signal from the slave devices and detects and notifies the operating state of the load or an abnormality in the load operation, and the first device detected by the monitoring device. When an operating state that constitutes one operation is transmitted from the slave unit to the master unit, and when the load operates in the first predetermined time from this one operation, the operation time of this load is set to the second predetermined time shorter than the first predetermined time. When the operation time is shorter than the second predetermined time as compared with the predetermined time, the monitor output indicating the operation is not transmitted from the slave unit, and when the operation time is longer than the second predetermined time, the first predetermined time is exceeded. Send the operating status of the load within the time from the slave unit Even if the load operates in the first predetermined time after the first operation, if the operation is completed within the second predetermined time, the monitoring output of this operation is output from the slave unit to the master unit. By not transmitting, it is possible to reduce the transmission frequency of the slave unit, thereby preventing information loss due to duplication of transmission and the like, and the load is activated within the first predetermined time. However, if the load operation time is the second predetermined time or longer and the necessary information leads to an abnormal state of the load operation, a monitoring output corresponding to this operation is sent from the slave unit to the master unit. By sending the information, the necessary information can be sent to the master device. Therefore, there is an effect that highly reliable signal transmission, which is carried out by the conventional bidirectional signal transmission system, can be performed by the one-way signal transmission system having a simple structure.

[Brief description of drawings]

1 and 2 are operation explanatory views of an embodiment of the present invention, FIG. 3 is a flowchart of the same as above, FIG. 4 is a schematic configuration diagram of a conventional example, FIG. 5 is an operation explanatory view of the same, and FIG. The figure is a diagram for explaining the operation of another conventional example. A is a parent device, B is a child device, C is a door, and 1 is a sensor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuki Honda Kadoma City 1048 Kadoma, Matsushita Electric Works Co., Ltd. (56) Bibliographic references Sho 53-133990 (JP, U)

Claims (1)

(57) [Claims] 1. A plurality of slave units, comprising a monitoring device for monitoring the operating condition of a load that completes one operation when changing from one operating condition to another, and transmitting the monitoring output of the monitoring device. A master unit that receives a signal from this slave unit and detects and notifies the operating state of the load or the abnormality of the load operation is provided, and the operating state that constitutes one initial operation detected by the monitoring device is When the load is transmitted from the slave unit to the master unit and the load is operated in the first predetermined time from this one operation, the operation time of this load is compared with the second predetermined time shorter than the first predetermined time, and this operation is performed. When the time is shorter than the second predetermined time, the monitor output indicating this operation is not transmitted from the slave unit, and when the operation time is longer than the second predetermined time, the operating state of the load within the first predetermined time is checked. A piece characterized by being transmitted from a child device Transmission control method of the counter signal transmission system.