JPH02230399A - Security interface device - Google Patents

Abstract

PURPOSE:To dissolve a problem of complicted wiring by providing a repeater of serial transmission system between a computer and a sensor, performing the transmission of information between a device which performs sensor control, monitoring, alarm issuing, and display and plural sensors with a serial interface of radio system, and using a relay system. CONSTITUTION:The sensor 1 is connected to an interface device 2, and next, the repeater 3 is connected to the computer 5 with a cable 4. And radio communication of polling access system is performed between the interface device 2 and the repeater 3, and also, communication based on RS232C is performed between the computer 5 and the repeater 3. The repeater 3 stores the number of the interface device designated by the computer 5, and communicates with the interface device 2 sequentially, and transmits data in each sensor 1 to the computer 5. In such a way, it is possible to provide a long distance between the plural sensors and the computer, and to increase the number of sensors compared with that of wiring.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an interface device for connecting a sensor and a computer in a security system or the like, which can be extended to any desired distance and is less likely to malfunction.

[Conventional technology]

Japan is one of the countries in the world where natural disasters occur, including earthquakes, typhoons,
There is a lot of damage caused by tsunamis, etc. Additionally, there are secondary disasters such as wide-area fires and wide-area floods. Furthermore, there are many social crimes such as theft, robbery, and kidnapping. In order to minimize such damage, security systems for disaster prevention, crime prevention, etc. are installed, which consist of computers, sensors, and wired or wireless communication lines connecting them.

Conventional security systems include (a) a wired interface device that performs sensor control, monitoring, alarm, and display, and a wired interface device that transmits information between multiple sensors in parallel;
(Example) There was a serial interface device that transmitted the same information using a polling access wireless method (for example, "Electronic Information and Communication Handbook, Volume 2", March 30, 1988, published by Ohmsha Co., Ltd., pp. 2034)
.

FIG. 5 is a configuration diagram of a conventional parallel wiring system,
5 is a computer, 4 is parallel wiring, and 1 is a sensor.

In this way, in order to connect multiple sensors to one computer, it is necessary to perform parallel wiring.

FIG. 6 is a configuration diagram of a conventional wireless system.

The computer 5 and the plurality of sensors 1 are coupled via a wireless communication path 6 between a wireless device 2 connected to the sensor 1 and a wireless device built into the computer 5 .

[Problem to be solved by the invention]

As shown in Figure 5, in conventional security systems such as fire prevention and crime prevention, the wiring connecting sensors and computers is parallel wiring, so as the number of sensors increases, the amount of wiring also increases. The wiring was complicated. The problem of complicated wiring (so-called wiring ghosts) that accompanies installation is a major constraint on the introduction of security systems in terms of construction, maintenance, and cost.

Furthermore, in order to avoid this complicated wiring, attempts have been made to transmit information using a wireless method using a computer as a master station and a sensor as a slave station, as shown in FIG.

When many slave stations are connected to one master station, in order to avoid signal interference, the master station transmits the necessary data with an address specified, and the slave stations that have data for the corresponding address are sent. A so-called polling method is used in which the station sends back data.

However, in the wireless method using radio waves, the transmission distance is several tens of meters due to regulations of the Radio Law, and in the wireless method using infrared rays, the practical transmission distance is 10 meters due to the performance of the light emitting and light receiving element parts. Since the distance between the master station and the slave station cannot be extended beyond this range, it is necessary to install 12 sensors within this range. In this way, wireless systems have limitations in terms of distance.

In addition, in wireless systems, in order to extend the transmission distance,
A method of using a commercial power line as a transmission medium (an antenna) has also been attempted. However, this method also has the problem that when similar systems are installed adjacently, signals overlap, causing malfunctions.

The purpose of the present invention is to solve such conventional problems, eliminate complicated wiring in security systems, and provide a security system that can extend the installation distance between the master station and slave stations.
The purpose is to provide an interface device.

[lI! Means to solve the problem]

In order to achieve the above object, the security interface device of the present invention includes a plurality of sensors installed in remote locations and a computer coupled to the sensors to control, monitor, alarm, and display the sensors. In the equipped security system, each sensor is connected to a sensor that has been assigned a unique address in advance, and if the assigned address and the received address match, the data of the connected sensor is returned via a wireless communication channel. Receive the addresses of the interface device and the sensor to be operated from the computer, poll each interface device sequentially with a unique address, receive sensor data from each interface device, store the data, and then store the data. The present invention is characterized in that it includes a repeater that transmits the information to the computer via a communication path.

[For production]

In the present invention. In this method, a serial transmission repeater is installed between the computer and the sensor. That is, information is transmitted between a device that performs sensor control, monitoring, alarm, and display and a plurality of sensors by using a wireless serial interface instead of parallel wiring, and by using a relay method. For this purpose, by assigning a unique address to each sensor, these sensors always receive the address from the repeater and send back the sensor data when the address matches their own address. As a serial interface device, for example, CCITT's V. 24. V. A serial interface device such as RS232C or R5422 standardized by JIS-28 and JIS-C6361 is used.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a basic security system illustrating one embodiment of the present invention.

In FIG. 1, 1 is a sensor for checking hazardous areas such as electricity, fire, water, crime prevention facilities, etc., 2 is an interface device equipped with a transmitting/receiving circuit for transmitting information detected by the sensor using a prescribed protocol, and 3 uses a polling access transmission method to sequentially call multiple interfaces, registers the transmitting/receiving circuit that takes in sensor information, and the R interface number to be called and sends out the sensor information.
Repeater equipped with a transmitting and receiving circuit compliant with S232C or RS422, 4 is RS232C and RS422 cable, 6 is wireless or optical fiber communication path, 5 is RS 2
It is a computer equipped with a 32C or RS422 transmission/reception circuit, and has sensor control, monitoring, and display functions.

To operate this system, first connect the sensor 1 and the interface device 2, then connect the repeater 3 and the computer 5 with the cable 4, and then use the polling access method wireless connection between the interface device 2 and the repeater 3. communication or optical fiber communication, and the computer 5
Communication based on RS232C or RS422 is performed between the repeater 3 and the repeater 3. That is, the computer 5 specifies and confirms the interface number to be operated toward the repeater 3, and at the same time receives sensor information data sent from the repeater 3. The repeater 3 stores the number of the interface device specified by the computer 5, communicates with the interface device 2 in order based on the stored number, and transmits the data of each sensor 1 to the computer 5. The interface device 2 always receives a signal from the repeater 3, and if it matches a preset number, takes in the data from the sensor 1 and transmits it to the repeater 3.

FIG. 2 is a configuration diagram of a communication network using the security system shown in FIG. 1.

Multiple repeaters 3 centered around one computer 5
A cable 4 connects each repeater 3 to the interface device 2 connected to the plurality of sensors 1 via the wireless communication path 6, and polling access is performed sequentially using a unique address. Device 2
Then, when the address matches the own address, the sensor information detected by the own sensor 1 is sent back.

FIG. 3 is a format diagram of data transmitted from the repeater and sensor of FIG. 1, respectively.

As shown in FIG. 3(a), the frame sent from the repeater 3 to the interface device 2 of the sensor 1 is composed of a unique address assigned to the sensor and instruction data for activating the sensor. . Furthermore, as shown in FIG. 3(b), the frame sent from the interface device 2 of the sensor 1 to the repeater 3 is based on the unique address assigned to that sensor and the data detected by that sensor. configured.

FIG. 4 is a block diagram of the repeater in FIG. 1.

The repeater 3 includes a microprocessor 41 connected to a common bus 40, a transmitting/receiving device 42 for communicating with the computer 5, and a device for storing instructions and addresses from the computer 5 and data from the sensor 1. , and a transmitting/receiving device 44 for communicating with the interface device 2 of the sensor 1.

The effects of this embodiment are as follows: (a) The practical limit of the length of the cable 4 connecting the computer 5 and the repeater 3 is RS232C when the transmission speed is 1200 bits per second.
The distance from the computer 5 to the repeater 3 can be sufficiently long because it is several 100 m/h/l/ and 4 kilometers for RS422. In addition, by using a polling access wireless method for communication between the repeater 3 and the interface device 2, wireless communication using radio waves, infrared rays, ultrasonic waves, etc., or using an optical fiber for communication as a transmission medium is possible. Optical fiber communication, etc. can be adopted depending on the usage conditions, and these can also be mixed for each repeater 3. Furthermore, (c) when adding repeaters 3, only the cables 4 are added, so there is no need to worry about complicated wiring, and the cables can be easily laid when adding repeaters. In addition, (2) since signal processing can be digitized, integration technology such as one-chip microcomputers can be applied to the circuit mounting components of the repeater 3, sensor 1, and interface device 2, allowing for miniaturization and mass production. can be achieved. (e) Communication between the computer 5 and the repeater 3 is carried out using standardized RS2.
3 By making it compatible with 2C or RS422,
Since the computer 5 can be directly connected to a commonly used personal computer, industrial computer, microcomputer, etc., a dedicated device is not required. Furthermore, system operations such as sensor control, monitoring, alarms, displays, and data storage can be freely designed and controlled on a computer program, which is extremely convenient.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to increase the distance between multiple sensors and a computer, and it is possible to increase the number of sensors compared to the number of wires. It becomes easy to introduce. In addition, it is possible to select various wireless systems and mix them according to usage conditions, and it is possible to use integrated circuit technology to achieve miniaturization and mass production.
In addition, it is possible to use personal computers, which are commonly used as computers, so there is no need for special equipment, and furthermore, it is possible to freely design and control system operations on a program. There are some advantages.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a basic security system showing an embodiment of the present invention, Fig. 2 is a block diagram of a communication network according to the present invention, and Fig. 3 is data sent from the repeater and sensor of Fig. 1. FIG. 4 is a block diagram of the repeater in FIG. 1, FIG. S is a block diagram of a conventional parallel wiring system, and FIG. 6 is a block diagram of a conventional wireless system. l: sensor, 2: interface device, 3: repeater,
4: cable, 5: computer, 6: wireless communication channel. Figure 7 From the repeater to the sensor

Claims (1)

[Claims] (1) In a security system that includes a plurality of sensors installed in remote locations and a computer that is connected to the sensors and controls, monitors, alarms, and displays the sensors, a unique address is assigned in advance. an interface device that is connected to each sensor connected to the sensor, and that returns data of the connected sensor via a wireless communication path when the assigned address and the received address match; and an interface device that returns the data of the connected sensor via a wireless communication path; a relay device that sequentially polls and accesses each interface device using a unique address, receives sensor data from each interface device, stores the data, and then transmits the data to the computer via a communication path; A security interface device comprising: