The radio modules use only small part the allocated industry frequency band means that the whole frequency band possible install parallel radio nets working their own “sub-channels” and they not disturb each other. Every single sensor can connected the wireless network modules over any electrical interface; the mutual conversion the electrical interfaces provides WACO. From the central system point view the WACO data collection network works one several standard data buses (M-Bus, RS-485), can work serial line RS-232 which over there are delivered the data collected from all the sensors. The example the utilization WM868-R2, WM868-U WM868-R4 described the Figure The design the modules WM868-R2, WM868-R4 and WM868-REP shown the Figure the picture attachment. Via these units can create asynchronous transparent channel which enables the information transmission from the remote data bus segments local data bus. 1.Content:
1. that there are several possible communication paths between the central collection point and other single elements (measuring devices) which can used for data transfer. That why the radio network keeps high reliability, regardless high number (hundreds) radio elements working one wireless network. special algorithm transmitting windows combination with method pseudorandom delay during the transmissions enables avoid minimize level radio collisions. works half duplex mode both radio and communication interface. WM868-R2, WM868-R4, WM868-U and WM868-REP modules definition
The modules WM868-R2, WM868-R2, WM868-U and WM868-R4 are designed for creation wireless data link data bus according RS-232 RS-485 standard designed for transfer telemetric data and control signals within buildings, yards, industrial parks and other sites. WACO system WACO (Wireless Automatic Collector) system wireless elements operating 868 MHz frequency band. WM868-REP designed repeater (range extender) the signal any modules WACO system (WM868-MM/MS, WM868-R2/R4, WM868-SJ). General information Module definition WM868-R2/R4/U/REP Technical parameters WM868-R2/R4/U/REP Indication and controlling elements Installation and operation Conditions for guarantee and repairs Picture attachment
1. The module not equipped link interface. WM868-R2/R4/U/REP description and operation Page 2
. WACO has been designed for data transfer from sensors and other telemetric elements central data processing system. The communication algorithms used here provide high probability the element accessibility the system. M-Bus format) using electric interface M-Bus, RS-845 RS-232 for connection single sensors also for connection the central system.1. WACO network communication protocol was designed provide maximum data transmission reliability and redundancy, that multiple data paths are used for data transfer but the same time the network protected against circularity and multiplication the messages sophisticated algorithms. General information
1. The modules can operate common heterogenous bus with WM868MM/MS (M-Bus modules) and WM868-SJ (data collection unit for analog and pulse modules).g. Change network frequency onto another sub-channel can used also the case disturbance elimination need avoid other radio system which would work the same frequency band.2. With using special conversion modules the devices (meters) with digital pulse output and/or analog output can connected WACO network well. Radio network characteristics: The radio network topology mesh type where reach each radio element there could placed several other network elements and all them could operate also repeaters received signal.
2. The system WACO transmits the data transparently bus format (e
