I. Introduction
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 Sinosun's SCADA series digital radio digital signal processing, error correction coding, software radio, digital modem and an integrated design, surface mount technology, high performance, high reliability and strong anti-interference characteristics, provides a standard radio RS-232 data port can be directly with the computer, RTU, PLC, GPS receivers, digital cameras, data terminals and other connections, transfer rates up to 19200bps, BER less than 10E-6 (reception level-110dBm), the transmission power 0.5 -25 watt adjustable, any type of radio can be set to master or remote station use, transit-free communication distance of 50 km, able to adapt to the harsh indoor or outdoor environment. Radio data and voice compatible, can work in simplex, half duplex, time division duplex TDD, full-duplex mode, receive the same frequency or different frequency transit network, and with remote diagnostics, testing, regulatory functions, or meet the needs of industry dispatch control center and many remote stations for data acquisition and control.
Second, the system structure
With social progress and development of industrial production, increasing emissions of various pollutants, to protect the environment pollution control, it is necessary to take high-tech means of various sources in real time, effective emissions monitoring and control.
Environmental dispatch command center control room set up digital radio-based station, remote site data radio with the flow meter, waste water emissions monitor serial port connection, will monitor the flow of collection, chemical oxygen demand, ammonia nitrogen volume, PH, exhaust gas flow, dust concentration, exhaust oxygen content, exhaust gas moisture content, exhaust temperature, exhaust gas pressure, sulfur dioxide and other data uploaded to the dispatch command center environmental monitoring stations.
Central station with the communication processing computer, the master radio. Master radio power 25W, radio omnidirectional antenna mounted on the roof of the EPA, about 30 meters height, unobstructed effective range of about 25 km. The sub-station radio according to the terrain and distance, the choice of 5W or 25W radio, set up sub-station directional antenna height from the relative position of sub-stations based on actual conditions. There are mountains on the distance or location of the communication block covered by a high hill (such as Guifengshan) Taichung turn relay to achieve erection. The system is structured as follows:
Multipoint wireless data acquisition monitoring communication system (with remote relay)
Third, performance indicators
1, frequency: WDS X510 series radio can work in 220 ~ 240MHz (2510 model) / 330 ~ 512MHz (4510 type) normal band.
2, transfer rate: 9600bps.
3, work: support simplex, half duplex, etc..
4, transmission distance: 30 km (open non-stop).
5, the physical interface: standard RS-232, communication speed can be adjustable from 300 to 38400bps, fully transparent transmission, no special communications software.
6, system architecture: Support for point to point, multipoint transmission, a multi-level transit network.
7, Modulation: 4 CPFSK.
8, channel spacing: 12.5KHz.
9, transmitting power: 5/25W.
10, bit error sensitivity:-108dBm or more (bit error rate BER ≤ 10E-6).
11, transceiver switching time: less than 15ms.
12, Sleep current: less than 18mA.
13 Frequency stability: ± 1.5ppm.
14, status and error indication: LED status indication, including power, carrier, transmitting data, receiving data and a variety of fault alarm.
15, short-circuit protection: Yes.
16, operating temperature: -30 ℃ ~ +60 ℃, at work: -40 ℃ ~ +70 ℃.
17, relative humidity: 95%, 40 ℃, non-condensing.
18, power supply: the radio work when the voltage is 10.5 ~ 30VDC, emission current of 575mA (2W power, 13.8VDC), receive current of 75mA. Work with switching power supply 220VAC.
19, free radio parameters, diagnostic setting software.
20, Dimension:
Integrated board products: 110 * 19 * 95.
The whole product: about 165 * 44 * 120.
21, Weight:
Integrated board products: about 0.13KG.
The whole product: about 0.45KG.
