RU84149U1 - CENTRALIZED MONITORING REMOTE CONTROL PANEL - Google Patents

Abstract

A central monitoring station for a radio notification system (CMS) containing a series-connected antenna-feeder path including an antenna with a circular radiation pattern and a drop feeder, a simplex-type transceiver unit, a radio control unit, a personal computer with specialized operator software installed on it, characterized in that between the control unit of the radio station and the personal computer are introduced sequentially connected galvanically isolated the first RS485 interface converter, a symmetrical two-wire communication line and an interface unit containing a second galvanically isolated converter of the RS485 standard interface to RS232 (USB).

Description

The invention relates to wireless radio systems for transmitting notifications and can be used as part of a central monitoring station (CMS) of radio systems for transmitting notifications for the protection of real estate, citizens' apartments, offices, warehouses, garages, etc., and for fire monitoring in units of the Ministry of Emergencies.

Radio-channel alarm systems are known that contain a centralized security console, a monitoring station and security sensors (detectors) installed at monitoring objects that are connected via object terminals and communication channels to the monitoring station. The most reliable radio alarm transmission systems from the point of view of delivering alarm notifications are the so-called synchronous-address type systems, in which the response from object receiving and control devices containing a transceiver is carried out only in the allowed time interval and only by command from the monitoring station. It is also known that the quality of the monitoring station communication channel - object equipment, the communication range, the cost of installation and equipment of the monitored object (the presence of remote or directional antennas, the transmitter power of the object equipment) directly depends on the height of the antenna mount of the transceiver transceiver and the free space around it ( not less than several tens of wavelengths). Therefore, the main requirement when deploying the monitoring station is the installation of antennas at geometrically high elevated points, for example, which is typical for urban development, on the roofs of high-rise buildings. The central security console itself, which includes the monitoring station radio systems, most often located on the ground floors

buildings, which is typical for office premises, and is associated with convenience, both for staff, visitors, and for certain organizational events.

It is known that the communication range and noise immunity of a communication channel directly depend on losses in the feeder line connecting the antenna with the input of the transceiver. For example, in the UHF range - (430 ... 470) MHz, the losses in a modern, widely used for construction of monitoring station, double-insulated coaxial cable with a foamed dielectric (for example, of the DX10A type) are about 3 dB per 30 m of its length. A further increase in the length of the feeder, for example, up to 100 m, will increase the attenuation to 10 dB, i.e., by (6..7) dB more than with a standard 30 m cable length, which, in accordance with the formula for the maximum range of a radio line (Radio systems: Training for universities / Yu.P. Grishin, V.A. Ipatov, Yu.M. Kazarinov and others; Edited by Yu.M. Kazarinov. -M.: Higher School, 1990, p. 215) to reduce the communication range of the monitoring station - a controlled object at least 2 times. Hence the main drawback is the inability to ensure the quality of protection of controlled objects due to the spatial combination of the equipment of the monitoring station’s radio system, ensuring the quality of the communication channel of the monitoring station ’controlled object, with the equipment of the central security console, which ensures the practical operation of the radio system.

This drawback of the construction of the monitoring station associated with the physical nature of the impossibility of increasing the length of the feeder line is characteristic of most known radio security systems, both asynchronous type with a one-way communication channel, and synchronous type with a two-way communication channel. Examples of this are the communication system of a guarded vehicle (RU No. 2094850, G08B 13/00, 1997.10.27), a remote signaling system over the air (RU No. 2058592, G08B 1/08,

1996.04.20), the fire and security alarm system "ROS-1" (RU 12472, G08B 25/00, 2000.01.10).

Especially the problem of quality loss in the monitoring station communication channel - the monitored facility is exacerbated when using the monitoring station radio systems in the unlicensed frequency range (433.92 +/- 0.2%) MHz, where the transmitting equipment power is in accordance with the Decision of the State Commission on Radio Frequencies (SCRF) at The Russian Ministry of Communications, which does not require special permits for the purchase and operation of security equipment in the State bodies of communications supervision, cannot exceed 10 mW. For example, in a radio channel security system with patrol vehicles (RU No. 2238589, G08B 13/00, December 4, 2003), a radio channel information collection and processing system for centralized protection of vehicles, real estate, people and animals (RU No. 2198800, G08B 13 / 00, 02.20.2003), a radio channel alarm system for the centralized protection of vehicles, real estate, people and animals (RU No. 2182088, B60R 25/00, 05/10/2002), containing a remote terminal device with an antenna of the remote terminal device for communication over the air.

The closest to the construction of the monitoring station to the claimed utility model is the monitoring station of the radio notification system (RU No. 74232 U1, G08B 26/00, 06/20/2008), where the monitoring station of a synchronous-address system with a two-way communication channel contains: an antenna-feeder path, including an antenna with a circular radiation pattern and a low loss reduction feeder, a personal computer, a simplex type transceiver unit connected via an additional interface device (radio control unit) to a personal computer with a special ializirovannym software operator software, computer backup power supply, transceiver and a control unit

a radio station. As a transceiver unit, they are used as commercially available mobile radio stations of a given frequency range such as “Motorola”, “Kenwood”, “Icom”, etc., having external inputs for controlling channel switching, transmitting, modulation input, receiver output, etc. ., and transceivers adapted for use in the monitoring station. The interface device interfaces computer ports, such as RS232 or USB, with transceiver inputs and transmits control signals and data signals from the computer to the transceiver.

The task of creating a utility model is to improve the quality of the monitoring station communication channel - a monitored facility, to increase the noise immunity and reliability of the transmission of alarm notifications in notification radio systems when constructing centralized radio security systems or fire monitoring radio systems.

The task is achieved by the fact that the monitoring station radio notification system containing a series-connected antenna-feeder path, including an antenna with a circular radiation pattern and a feeder reduction with small losses of a limited length, a simplex type transceiver unit, a radio control unit, a personal computer with installed on it specialized operator software entered between the radio control unit and a personal computer is sequentially turned on s galvanically isolated RS485 converter interface standard, symmetrical two-wire communication link and interface unit comprising a second electrically isolated converter RS485 standard interface RS232 (USB), which makes it possible to spread the functionality of the monitoring station equipment, such as antenna-feeder circuit, a transceiver and

the operator’s personal computer in separate and sufficiently remote from each other premises, without increasing the length of the feeder line.

The essence of the utility model is illustrated by the drawing (Fig. 1.), which shows a structural diagram of the construction of the proposed monitoring station radio notification system, explaining the principle of its operation.

The monitoring station monitoring station contains two conventionally divided equipment parts: the first part is equipment 1, spatially removed from the central security control room, containing a transceiver unit 2, to the radio-frequency input of which there is a low-loss reduction feeder 3 output with low losses, the input of which is connected to the output pin collinear antenna 4 of vertical polarization with a circular radiation pattern placed in a geometrically high point of free space, radio control station 5 with a built-in RS485 interface converter 6 connected to the operating mode control inputs (channel switching, transmitting, modulation input, receiver output) of the transceiver unit 2 and two-wire communication line 7, and the backup power supply 8, which supplies power to the radio control unit 5 and transceiver unit 2 in the event of a 220 V AC network failure; the second part - equipment 9, directly located in the central security control room, containing the interface unit 10 with a built-in RS485 interface converter 11, a personal computer (computer) 12 connected to the RS232 or USB port with a specialized operator workstation installed on it and a backup power source 13.

The monitoring station of the radio notification system operates as follows. The personal computer 12 in accordance with the algorithm installed on it programs generates information message codes and codes

control unit radio control 5 for cyclic polling of objects controlled by the radio system. The current values of the codes in the RS232 (USB) standard format are transmitted through the corresponding port of the computer 12 to the input of the interface unit 10, where the microcontroller, through the galvanic isolation device and interface converter 11, contains an RS485 differential transceiver, for example, an ADM485AR chip, is converted into RS485 signals, characterized by increased noise immunity due to insensitivity to common mode noise when working in long wired communication lines. From the output of the interface unit 10, the signals through a two-wire communication line 7 go to the input of the control unit of the radio station 5. Since the exchange rate between the computer and the control unit of the radio station is low, about (9600 ... 19200) bps / sec, there are requirements for the design of the communication line 7 is quite soft, the communication line 7 can be implemented as an independent twisted pair in a screen, a dedicated telephone line, just a pair of conductors connecting the interface unit 10 to the radio control unit 5. In the radio control unit 5, the signals received on a similar (as in interface unit 10) second RS485 interface converter 6, also containing an RS485 differential transceiver and galvanic isolation, converted into binary code and fed to the microcontroller of radio control unit 5, where they are converted into control signals of transceiver unit 2. According to with the code received from the computer 12, the control voltage corresponding to the frequency channel number of the transceiver unit 2 is set to the input of the transceiver unit 2, low-frequency th information signal on the modulation input and a signal transmitter activation. The transceiver unit 2 goes into transmission mode and in accordance with the operation algorithm

radio systems through the feeder path 3 and the antenna 4 transmits a broadcast request to controlled objects. After the transfer is completed, the control unit of the radio station 5 immediately puts the transceiver unit 2 in the receive mode by setting the necessary control voltages on the corresponding control inputs of the transceiver unit 2. The monitored object receives a message from the monitoring station and, in response to a request from the monitoring station, generates a notification about its condition and transmits it back to the monitoring station (the method of interaction between the monitoring station and the controlled objects is not included in the subject of the claimed utility model). The transmitted radio signal containing the notification of the monitored object through the antenna 4, the feeder path 3 is fed to the input of the receiver of the transceiver unit 2, from where the code sequence, after selection and demodulation, is output to the control unit of the radio station 5, from the output of which through a galvanically isolated RS485 interface converter 6 two-wire communication line 7 is fed to the input of a galvanically isolated converter of the RS485 interface 11 of the interface unit 10 and then after conversion to the RS232 (USB) port of the personal a computer 12 for further processing and visualization of the current notification from the monitored object, thus completing, therefore, a monitoring station information exchange session with one monitored object. In the future, the monitoring station monitoring procedure is repeated for all controlled objects, thus realizing continuous monitoring of their current state.

The proposed structure of the monitoring station radio system allows a flexible approach to its practical construction: it is possible to distribute parts of the monitoring station equipment at distances from several meters to several kilometers without loss of protection quality.

The positive effect in the proposed utility model is based on a combination of physical principles of the qualitative organization of the communication channel,

especially relevant in conditions of limiting the power of monitoring station equipment and radio equipment on-site equipment in the range (433.92 + 7-0.2%) MHz, and the technical feasibility of spatial separation of the most sensitive to the location of the high-frequency part of the monitoring station equipment and the part of the monitoring station equipment operated by ground services, by replacing a high-frequency communication line (RF reduction feeder) with a two-wire digital low-frequency communication line, the length of which can be much longer than the length of the coaxial high-frequency line and communication.

The proposed monitoring station of the Irtysh-3 P notification radio system was tested by the departments of the military aviation department at the Department of Internal Affairs of the city of Murmansk. The uneven, mountainous terrain required the installation of an antenna-feeder and transceiver part of the monitoring station at an elevated point (on a mountain slope) of the city; the central security console itself has historically been located in a building in a valley between hills. As a two-wire communication line, a dedicated telephone pair was used with a length of about 2 km, the proposed technical solution not only increased the quality of protection, but also realized the technical possibility of operating the monitoring station in a difficult terrain, and the radio coverage area covered the entire city.

Claims (1)

A central monitoring station for a radio notification system (CMS) containing a series-connected antenna-feeder path including an antenna with a circular radiation pattern and a drop feeder, a simplex-type transceiver unit, a radio control unit, a personal computer with specialized operator software installed on it, characterized in that between the control unit of the radio station and the personal computer are introduced sequentially connected galvanically isolated the first RS485 interface converter, a symmetrical two-wire communication line and an interface unit containing a second galvanically isolated converter of the RS485 standard interface to RS232 (USB).