Digital Radio and Typical Applications

D、Network management functions

Network Management System is a point in the network, the use of PC and other terminals, the whole network system in the management of communications equipment.

INSITE is a SCADA radio system network management software family of wireless data transmission system network management software.It uses a PC, the system can be a multipoint base station, remote station, relay station for remote monitoring and control.That can be easily monitored X710 digital radio in the office of the state system, without having to go to the scene to change the system setup parameters can also be in the network system of any one site, such as the main station, relay stations, remote stations, network management software using INSITE management control.

Insite network management function interface diagram

INSITE software has many features, the radio series in the SCADA system is very easy to implement. The main features include:

1.Built-in RTU Simulator: INSITE can be used in any radio network simulator RTU open, check the radio link quality and radio settings. Other polling software can poll the RTU simulator.

2.INSITE software radio system to monitor operational status, diagnostics, communications by radio, RTU, power supply or transmission problems caused by the path. This system is often used to detect small problems, and make correct, to avoid affecting the entire network operation. If you must go on-site inspection, inspectors with the network management system to provide information usually has to determine the failure occurred, and prepare accordingly. In addition, INSITE can be used to determine if the problem is on the radio or RTU, and can be reset from a central control room RTU, RTU fault clearing.

3.Far radio set: Many radio stations are available through the wireless channel remote settings. For example: output power, set the type, time out timer delay, transmit to receive frequency, data rate and format. According to radio types, different parameters can be set.

4.Alarm settings:
 a.Graphical display alarm data, color identification. Click to view alarm information. Allows users to set any alarm will cause an external trigger switch to start.
 b.Diagnosis of non-interrupt-style alarm polling: continuous or regular police inquiry, without interrupting the user's data.
 c.Fast alarm status indicators: if the polling station on the network does not respond. It was soon discovered. Interrupt type can be diagnosed quickly check the radio alarm.

5.Station Auto Search: station search functions can be automatically generated list of new equipment. Within 30 minutes, can be completed in the end 9999 from the 0000 default address code search. Search results can be added to the list of new equipment, or join an existing list of equipment.

6.Technical support using the coding operation switch COS: using a PC connected to multiple base stations in the same location. This feature can be resolved with a remote base station by radio address problems caused by the diagnostic port, COS coding operation switch built into the X790 performance within the radio base station. If more than one base station is not in the same location, this program is invalid.

7.Offers sleep mode wake-up: use of solar power in a number of occasions, the radio is often set to the sleep mode, communication is only to be awakened. If you need to wake up in the network management station, collecting data, you can use "wake-up mode" to collect the data, turn the radio change to sleep mode.

8.INSITE corporate network connection that allows system managers, engineers can get alarm information at any time, even away from the network management terminal, the alarm information by e-mail, SMS, etc. communicated to relevant personnel.

9.INSITE provides three levels of business connections:
 ODBC data link the network to the local or remote database.
 DDE Dynamic Data Exchange server on this machine with other applications or other applications on the network to share data.
 TCP / IP remote access server.
 ODBC parameters: If you have SQL database server in the network, allowing users to set the login user name and password.

10.Online help manual.

One application: multi-point / distance / speed / high-reliability wireless data acquisition and control system

Way with the radio remote data collection, monitoring and control, as opposed to set up special cable (or cable), rental of telecommunication lines, etc., with low cost, quick construction, reliable operation, easy maintenance and so on.
 Shenzhen Huaxia Sheng company with a portfolio of SCADA stations set up oil / gas, water, electricity, gas, railways, seismic / weather / environmental, GPS, finance, public security / transport / security, chemical, industrial control automation, data acquisition and control system structure below:

Multipoint wireless data acquisition monitoring system (no remote relay)

Multipoint wireless data acquisition monitoring system (with remote relay)

Typical Case: Xinjiang Oilfield, Chengdu water, Xintai electricity, gas Dandong, Shanghai Railway, the State Seismological Bureau, Jiangxi Meteorological Office, Harbin Forestry, Hangzhou street, Jiangmen Environmental Protection Bureau, Anshan Steel, Bao Steel coking coal in Inner Mongolia, the super fertilizer, South Africa Traffic Control, Dalian and so on.

Application II: point to point and multipoint number two, then two link

In conventional single-channel 25KHz, with full-duplex digital radio and multiplexer allows data transmission Road Road voice and structure as below:

 
Point system architecture

Master device with multiple-point stack, with the road, splitters and omnidirectional antenna cable and antenna sharing system, depending on the location of distribution points set up multiple remote periphery, which constitutes a point to multipoint wireless communication system.

Multipoint system architecture

Typical Case: Shandong Electric Power, Jiangsu power, Fujian and electric power.

Application of the three: large-scale / large / private wireless data network GPS

User capacity is dedicated wireless data networks of key indicators. Wireless data network subscribers by radio data rate, conversion time and send and receive information transmitted decision. To meet the requirements of large-capacity, dedicated wireless data networks, radio stations must provide high data rates, such as 19200bps or more, and be able to quickly send and receive conversion time 10ms period.

The current dedicated wireless data network devices are basically using conventional FM radio plus the realization of the MODEM. Radio work in 230MHz, 800MHz band data transmission business and 350MHz, 800MHz trunking services band. In 25KHz, data rate is basically 1200bps, 2400bps, a number of other uses GMSK MODEM chip to the output of the low frequency signal applied directly to the VCO input to achieve 9600bps wireless data transmission, but the way of the RF specifications, difficult to meet the Ministry of Information Industry requirements, and the 10-6 bit error sensitivity is very low, very close communication, which can not actually use. In addition, the conventional FM radio transceiver in 50-100ms conversion time around, can not send and receive high-speed conversion.

Shenzhen Sinosun Technology Co., Ltd. uses forward error correction coding, software radio, digital modulation coherent demodulation, Viterbi soft decision and the integration of design, surface mount technology to provide high-performance, high stability, high reliability and DSP radio. Radio provides a standard RS-232 interface directly with the computer, GPS receiver, control panel connection. 25KHz channel spacing of the air data rate of 19200bps ,10-6 BER sensitivity of-111dBm, transceiver switching time in less than 7ms, radio and other indicators in line with the requirements of the Ministry of Information Industry. Assume that each user terminal needs to transmit 50 bytes of information, the use of Shenzhen Sinosun radio just distribution:
    50 × 10 ÷ 19200 +7 = 33 ms time slots to each station.

Likewise, the use of FM radio stations plus MODEM, usually 2400bps way you need to allocate: 50 × 10 ÷ 2400 +50 = 258ms time slots. Two kinds of user capacity difference of about 8 times. If the GPS system requires updated information every 10 seconds, using the FM radio plus MODEM way can not accommodate 40 users, while the use of Shenzhen Sinosun station can accommodate 300 users.

In addition, we in the same environment, such as the center of Shanghai, currently the most dense urban high-rise experiments done. Provided with a domestic FM 9600bpsMODEM way data radio communication only less than 2 km (BER less than 10-6), while Shenzhen Sinosun radio can cover about 15 km radius.

    Shenzhen Sinosun Technology Co., Ltd. is China's earliest radio stations engaged in the development of wireless data transmission manufacturers of products are widely used in petroleum, electricity, banking, water treatment and other fields of telemetry, remote, remote control, similar 65% share of China market . Shenzhen Sinosun operating in all frequency bands simplex car units, duplex base stations, base stations and hot standby 2.4GHz frequency-hopping spread spectrum radio, radio with remote diagnostics and network management functions can be easily depending on the terrain, regional the formation of a variety of wireless data network.

Single dedicated wireless data communications network base station (opened in 2004, Beijing traffic police brigade command system GPS part)

 

More base stations dedicated wireless data communications network (opened in 2001, Shanghai Public Security Command system GPS part)

Typical Case: Shanghai Public Security Bureau, Beijing traffic police brigade, Shandong public security bureau.

Application of the four: low-speed long-distance wireless computer local area network

Between two or more local area network, a wireless Internet radio to achieve point to point / multipoint network interconnection, communication distance: 50 km, the transmission rate 9.6/19.2 Kbps. Topography system structure is as follows:

Typical Case: army unit ground command computer LAN, remote 10KV high voltage power line monitoring and management system.