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radiometrix ltd cxt/cxr ? multi channel remote cont roller data sheet page 1 features conforms to en 300 220-3 and en 301 489-3 high performance double superhet. pll synthesizer w ith tcxo saw front-end filter usable range over 1km 16 bit unit address (65535 unique addresses) momentary and latched outputs fully screened. low profile re-programmable via rs232 interface low power requirements applications industrial telemetry and telecommand hvac controls wireless door entry systems simple on/off switching in-building environmental monitoring and control high-end security and fire alarms heavy vehicle/machinery controls status reporting and monitoring secure systems technical summary operating frequency: 173.200 - 173.325mhz (uk band ) 150.825 - 152.450mhz (australian band) 433.875 - 434.650mhz (eu band) 458.525 - 459.1mhz (uk band) other custom vhf and uhf bands 32 channels @ 25khz channel spacing transmit power: +10dbm (10mw) / +20dbm (100mw) supply range: 3.1 ? 15v (tx @ 10mw and rx), 4.1 ? 1 5v (tx @ 100mw) current consumption: 34ma @ 10mw, 90ma @ 100mw (tra nsmit) and 20ma (receive) receiver sensitivity: -118dbm (for 12 db sinad) serial configuration by inverted rs232 at 3v cmos l evel multi channel 25khz nbfm remote control tx/rx the cxt transmitter and cxr receiver modules offer a multi channel, low power, and reliable remote control data link. this makes the cxt/cxr pair ideally suited to those low power applications where existing wideband modules have insufficient range, or where low cost multi- channel operation is needed without compromising on rf specification or regulatory requirement. figure 1: cxt2 transmitter and cxr2 receiver hartcran house, 231 kenton lane, harrow, middlesex, ha3 8rp, england tel: +44 (0) 20 8909 9595, fax: +44 (0) 20 8909 223 3, www.radiometrix.com issue 1, 27 july 2012 cxt/cxr
radiometrix ltd cxt/cxr ? multi channel remote cont roller data sheet page 2 easy control functions with cxt and cxr: there are certain user applications where a very si mple ?on/off? control function is needed (for examp le: control of floodlights, alarm sounders, machine ove rride shutdown). normally such applications require a simple microprocessor or dedicated remote control c hip to be added to the radio module, incurring extr a size, cost and sometimes software overhead. not anymore. the cxt and cxr module pair (based on either lmt2/lmr2 (uhf version) or lmt1/lmr1 (vhf version)) includes a simple-to-use single func tion controller/actuator, implemented in the firmwa re of the radio?s internal processor. this code allows th e unit to be used as a very simple remote control p roduct, with either a latched or a momentary output. no ext ernal control device is required. two inputs are provided on the cxt transmitter. gro unding input a sends a coded datastream to the cxr receiver which commands it to latch it?s a output h igh (+3v). grounding the transmitter b input sends a datastream which resets the receiver a pin to zero. also, for the duration of the b transmission, the receiver b output is high. the minimum duration of a b outpu t pulse is 300ms. the cxt transmits whenever either a or b are low, b ut to function the txe must also be low (this can b e tied low for simplicity, or diode 'or'ed with the a, b i nputs to minimise current consumption) the data format uses is a modified biphase format w ith an average data rate of 600 bits per second. a 42 bit data burst is used (preceded by ample preamble). th is incorporates a 16 bit unit address. this is easi ly modified via the 2400 baud serial communication por t (si pin), which allows both the unit address and the channel number (1 of 32 operating frequencies) to b e easily modified. commands are in an easy to understand ?ascii text and decimal numbers? form, s imply entered by hand from any terminal program. on ce programmed, values are stored in non-volatile memor y.
radiometrix ltd cxt/cxr ? multi channel remote cont roller data sheet page 3 figure 2: application circuits
radiometrix ltd cxt/cxr ? multi channel remote cont roller data sheet page 4 pin description ? cxt pin name function 1a vcc 3.1 ? 15v power supply 2a 0v ground 3a n_txe transmit enable (active low) 4a txd link to 4b 1b si serial frequency programming / configuration 1 2b a (in) main (latching) input 3b b (in) second (cancel) input 4b t_out link to 4a notes: 1. serial programming is by an inverted, cmos logic level, 2400 baud rs232 datastream applied to the si pin. 2. txe has a 100k pullup to vcc 3. do not exceed 3v logic levels on si, a or b. 4. si input has pullup (50k) to 3v internal rail. 5. a and b inputs have pullups (50k) to 3v interna l rail. (a, b inputs: active low) 6. cx versions can be identified by the presence of c7, on the underside of the lmt series tx board figure 3: cxt footprint (top view)
radiometrix ltd cxt/cxr ? multi channel remote cont roller data sheet page 5 pin description ? cxr pin name function 1a vcc 3.1 ? 15v power supply 2a 0v ground 3a rxe receiver enable (active high) 4a rxd link to 4b 5a n/c (af out) no connection, 700mv p-p audio. dc coupled, approx 0.8v bias. 1b si serial frequency programming / configuration 1 2b a (out) main (latching) output 3b b (out) secondary output 4b r_in link to 4a 5b rssi dc level between 0.5v and 2.2v. 60db dynam ic range notes: 1. serial programming is by an inverted, cmos logic level, 2400 baud rs232 datastream applied to the si pin. 2. do not exceed 3v logic levels on si, a or b. 3. si input has pullup (50k) to 3v internal rail. 4. a and b outputs are 3v cmos, active high. up to 5ma may be drawn from each 5. cx versions can be identified by the presence of c7, on the underside of the lmr series rx board figure 4: cxr footprint (top view)
radiometrix ltd cxt/cxr ? multi channel remote cont roller data sheet page 6 condensed specifications frequency 433mhz eu, 458mhz / 173mhz uk and 151mhz australian bands eu 433.875 - 434.65mhz uk: 458.525 - 459.1mhz 173.200 - 173.325mhz australian: 150.825 - 152.450mhz other custom vhf and uhf bands frequency stability 1.5khz channel spacing 25khz number of channels 32 (controlled via rs232 interface) operating temperature -20 oc to +55 oc (storage -3 0 oc to +70 oc) spurious radiations compliant with etsi en 300 220- 3 and en 301 489-3 transmitter output power +10dbm (10mw) 1db (factory adjustable 1 - 25mw) +20dbm (100mw) 1db (factory adjustable 25 - 100mw) peak deviation 3khz modulation type 2.5kbps fsk (biphase) data stream tx modulation bandwidth dc ? 5khz (3v cmos compatib le) adjacent channel tx power <-37dbm tx spurious <-45dbm (no output in standby) supply voltage 3.1v ? 15v (1-25mw) 4.1 ? 15v (25 ? 100mw) current 35ma @ 10mw (nominal) 65ma @ 50mw (nominal) 100ma @ 100mw (nominal) <9 a standby (txe high or floating) inputs data (cmos/ttl compatible) size 33 x 23 x 9mm (bim sized footprint, new pinout ) interface user 10 (8) pin 0.1" pitch dual row (5+5 or 4+4) header rf 2pin 0.1? pitch recommended pcb hole size 1.2mm receiver sensitivity -115dbm for <0.1% data errors) af bandwidth (-3db) 4khz image <-60db spurii / adjacent channel <-65db blocking - 84db lo re-radiation -60dbm auxiliary outputs rssi, audio supply voltage 3.1v ? 15v current 20ma receive <1 a standby (rxe low) size 46 x 23 x 9mm interface user 10 pin 0.1" pitch dual row (5+5) header rf 2pin 0.1? pitch recommended pcb hole size 1.2mm
radiometrix ltd cxt/cxr ? multi channel remote cont roller data sheet page 7 programming the cxt and cxr a 2400 baud cmos level ?inverted rs232 format? (1 start bit, 8 data, 1or 2 stop bits, no parity) is u sed. these units employs a sub-set of the programming c ommands used by standard lmt/lmr modules. in addition, the command avalue is used to set the add ress number. as the si pin is dedicated to serial communication only, the ?enableserialmode? command string is not required. to successfully program the unit it must be in acti ve state (rxe high, or txe low), so provision shoul d be made to force the unit into this state while progra mming (either a jumper, or a third pin on the progr amming connector, could be used). gochan aa serially select channel aa, where aa is ch0 to ch31 avalue bbbbb set value for unit address load aa nnnnn set value of n register for channe l aa, where aa is channels 0 to 31 rvalue rrrr set value for r register process entry / clear all buffers aa = a two digit channel number from 00 to 31 nnnnn = synthesizer n register value (up to 65535) rrrr = synthesizer r register value (up to 16383) bbbbb = unit address (up to 65535) cxt = 17356 25 900 . 433 = = = khz mhz f f n cing channelspa rf tx khz mhz f f r cing channelspa tcxo 25 13 = = , so r=520 vhf cxt units have 10mhz, not 13mhz reference oscil lators: khz 25 mhz 10 f f r cing channelspa tcxo = = , so r=400 (for vhf cxt) cxr = 16500 25 4. 21 900 . 433 4. 21 = ? = ? = khz mhz f mhz f n cing channelspa rf rx note : a pause of at least 50ms must be allowed between co mmand strings (eeprom programming time).
radiometrix ltd cxt/cxr ? multi channel remote cont roller data sheet page 8 figure 5: serial programming interface
radiometrix ltd cxt/cxr ? multi channel remote cont roller data sheet page 9 antenna requirements three types of integral antenna are recommended and approved for use with the module: a) whip this is a wire, rod ,pcb track or combination conn ected directly to rf pin of the module. optimum total length is 16.4cm (1/4 wave @ 433mhz). keep the open circuit (hot) end well away from metal components to prevent serious de-tu ning. whips are ground plane sensitive and will benefit from internal 1/4 wave e arthed radial(s) if the product is small and plastic cased b) helical wire coil, connected directly to rf pin, open circu it at other end. this antenna is very efficient given it?s small size (20mm x 4mm dia.). the helical is a high q antenna, trim the wire length or expand the coil for optimum results. the helical de-tunes badly with proximity to other conductive objects. c) loop a loop of pcb track tuned by a fixed or variable c apacitor to ground at the 'hot' end and fed from rf pin at a point 20% from the ground end. loo ps have high immunity to proximity de- tuning. a b c whip helical loop ultimate performance *** ** * easy of design set-up *** ** * size * *** ** immunity proximity effects * ** *** range open ground to similar antenna 500m 200 100 the antenna choice and position directly controls t he system range. keep it clear of other metal in th e system, particularly the 'hot' end. the best positi on by far, is sticking out the top of the product. this is often not desirable for practical/ergonomic reasons thus a compromise may need to be reached. if an internal antenna must be used, try to keep it away from othe r metal components, particularly large ones like transformers, batteries and pcb tracks/earth plane. the space around the antenna is as important as th e antenna itself. a. helical antenna b. loop antenna rf c1 c2 c4 c3 rf-gnd c. whip antenna 16.4cm rf 0.5 mm enameled copper wire close wound on 3.2 mm diameter former 433 mhz = 24 turns feed point 15% to 25% of total loop length track width = 1mm 4 to 10 cm inside area wire, rod, pcb-track or a combination of these three 433 mhz = 16.4 cm total from rf pin. 2 rf figure 6: antenna types (433mhz version)
radiometrix ltd cxt/cxr ? multi channel remote cont roller data sheet page 10 ordering information: part no. description frequency band (mhz) sup ply (v) rf power (mw) vhf cxt1-173-1 transmitter 173.200 - 173.325 3.1 -15 1 0 cxr1-173-1 receiver 173.200 - 173.325 3.1 -15 cxt1-151-1 transmitter 150.825 - 152.450 4.1 -15 1 00 cxr1-151-1 receiver 150.825 - 152.450 3.1 -15 uhf cxt2-433-1 transmitter 433.875-434.650 3.1 -15 10 CXR2-433-1 receiver 433.875-434.650 3.1 -15 cxt2-458-1 transmitter 458.525 - 459.1 4.1 -15 100 cxr2-458-1 receiver 458.525 - 459.1 3.1 -15 notes : 1. cxt/cxr are available on number of other vhf and uh f frequencies. other non standard uhf band frequencies are subject to saw filter availabi lity.
radiometrix ltd cxt/cxr ? multi channel remote cont roller data sheet page 11 appendix: cxt2-433-1 & CXR2-433-1 application boards
radiometrix ltd hartcran house 231 kenton lane harrow, middlesex ha3 8rp england tel: +44 (0) 20 8909 9595 fax: +44 (0) 20 8909 2233 sales@radiometrix.com www.radiometrix.com copyright notice this product data sheet is the original work and co pyrighted property of radiometrix ltd. reproduction in whole or in part must give clear acknowledgement to the copyright owner. limitation of liability the information furnished by radiometrix ltd is bel ieved to be accurate and reliable. radiometrix ltd reserves the right to make changes or improvements in the design, specification or manufacture of its subassembly products without notice. radiometrix lt d does not assume any liability arising from the application or use of any product or circuit descri bed herein, nor for any infringements of patents or other rights of third parties which may result from the u se of its products. this data sheet neither states nor implies warranty of any kind, including fitness for any particular application. these radio devices ma y be subject to radio interference and may not function as intended if interference is present. we do not recommend their use for life critical applications. the intrastat commodity code for all our modules is : 8542 6000 r&tte directive after 7 april 2001 the manufacturer can only place finished product on the market under the provisions of the r&tte directive. equipment within the scope of the r&tte directive may demonstrate compliance to the essential requirements specified in article 3 of the directive, as appropriate to the particula r equipment. further details are available on the office of comm unications (ofcom) web site: http://www.ofcom.org.uk/ information requests ofcom riverside house 2a southwark bridge road london se1 9ha tel: +44 (0)300 123 3333 or 020 7981 3040 fax: +44 (0)20 7981 3333 information.requests@ofcom.org.uk european communications office (eco) peblingehus nansensgade 19 dk 1366 copenhagen tel. +45 33896300 fax +45 33896330 ero@ero.dk www.ero.dk

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