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Transmitter/receiver delivers remote control switch function

Posted: 21 May 2010 ?? ?Print Version ?Bookmark and Share

Keywords:transmitter? receiver? remote control? switch?

CXT/CXR modules

From Radiometrix comes the CXT/CXR transmitter/receiver module family that provides a complete remote control switch function in a module format, delivering reliable, long range operation in situations where existing wide band solutions cannot offer adequate range, or where band congestion requires multiple channel operation.

With the inclusion of easy to use, single-function controllers/actuators, the CXT and CXR modules are highly suited to tasks that just call for a simple on/off control function (such as flood light control, machine override shutdown, etc), without the need for any additional external circuitry (such as a microprocessor or dedicated encoder/decoder IC). This keeps the size, BOM cost and software overhead associated with system designs that employ these modules to a minimum.

Supporting data rates of up to 5Kbit/s, the modules are built on the radio hardware of the company's LM series. Like the LM series, they provide 32 frequency channel operation (12.5kHz or 25kHz channels) in any of the 173.200MHz to 173.325MHz (UK), 150.825MHz to 152.450MHz (Australia), 433.875MHz to 434.650MHz (EU), or 458.525MHz to 459.1MHz (UK) frequency bands (plus other custom VHF bands on request), allowing them to meet the RF requirements of many different geographical regions.

The CXR receiver has a better than -118dBm usable calling sensitivity, while drawing only 20mA from a 3.1V -15V rail. The matching CXT transmitter can be offered in 10mW (35mA from 3.1V -15V) or 100mW (95mA from 4.1V -15V) versions, depending on specific band regulations.

The integrated control coder/decoder uses a highly noise-tolerant biphase coded data stream, including generous preamble/framing sequences, CRC error detection to minimize false activations and a 16bit user programmable address. All operating parameters (channel, address, frequency table setup) can be easily programmed by the user, via a simple serial interface. Put together, these features give the user a reliable remote actuator with an operating range of up to 1km.

Key applications for this transmitter/receiver pair include lighting control, security/fire/lone-worker alarms, 'machine stop' systems and generic industrial quality on/off switching mechanisms.

The CXT and CXR come in compact shielded housings, measuring 33mm x 23mm x 9mm and 46mm x 23mm x 9mm respectively, with pins for PCB mounting. The modules have an operating temperature range of -20C to +55C and conform fully with EN 300 220-3 and EN 301 489-3 standards. Class one (to EN300-220-v2.3.1) receiver versions are also available.

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