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Long-range wireless module operates at 434MHz

Posted: 20 May 2009 ?? ?Print Version ?Bookmark and Share

Keywords:wireless module? radio modem? UART?

MU-2-R wireless module

LPRS has announced Circuit Design Inc.'s new MU-2-R embedded low power radio modem for transmission of serial data. Operating at 434MHz, the MU-2-R measures just 36mm x 26mm x 8mm, making it almost half the size of the existing MU-1-R.

The MU-2-R wireless module is controlled by simple dedicated commands leaving the user free to concentrate on developing the transmitting and receiving programs for their system. For communication protocols the MU-2-R has a standard protocol and an error correction protocol, which performs error correction on the receiver side. The error correction protocol uses Reed-Solomon code that has strong error correction ability even in environments prone to burst errors. This ensures the user can configure highly reliable systems compared to conventional radio modems.

Transmitting and receiving data and issuing commands employ a UART interface with a single-chip CPU. In addition the module may be controlled via the COM port (RS232C format) of a computer, minimizing development times. The MU-2-R is designed to reduce design difficulties involving high frequency components, allowing the user to embed it in their system with peace of mind.

A battery operated 10mW MU-2-R covers a range of 600m or more. If the application requires greater range, the MU-2-R can be used as a relay station without any additional components. For long range applications up to 10 relay stations may be used, making it possible to gather data from and control equipment in remote locations.

Peter Cubbage, sales director of LPRS comments, "The new Circuit Design MU-2-R wireless modules are a welcome addition to our product range and will be particularly useful for security and control systems where low power consumption is required and long data transmission distances are involved. We have a great deal of experience with Circuit Design products and can offer application advice and design support to any of our customers who wish to use this advanced wireless module."

The Reed-Solomon code (RS code) is one of several FEC block codes; it has strong error correction ability and the characteristic of correcting data errors caused by burst noise. Reed-Solomon codes are used in compact disks, satellite communications, and digital TV broadcasting. The MU-2 uses Reed-Solomon code for FEC, which reduces errors occurring due to burst noise and/or noise at low received signal level, and it improves the receive sensitivity of the equipment by more than 5dB.

Standard features of the new Circuit Design MU-2-R include R&TTE compliance, low voltage and low consumption current (ideal for battery operated applications), 1:1, 1:N, and N:N systems can be built by flexibly setting link parameters, local access to the status of radio waves and field noise at the target station and source station, standby mode to save the power of systems, field status can be checked in real time using RSSI information in the packet data, a function to lower the output power (antenna power) from 10mW to 1mW is provided for effective use of radio waves. Selectable RF power between 1mW and 10mW allows the user to limit the communication area so that several networks do not interfere with each other.

Typical applications for the new Circuit Design MU-2-R include, serial data transmission, energy monitoring, data monitoring devices, handheld terminals, barcode reader, housing equipment control, tele control, warning systems, remote control for construction machinery, display devices, motor control, lifters, remote control of fire alarm equipment, telemetry, security systems, water level monitors for rivers etc.

- Henri Arnold
EE Times Europe

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