radiometrix ltd rdl2 data sheet page 1 the rdl2 is a half duplex radio transceiver module for use in high-speed bi-directional data transfer applications at ranges up to 300metres. the small f ootprint of 23 x 33mm together with low power requirements of <28ma @ 5v enable convenient pcb in stallation. rdl2 allows operation on one of 5 pre-set frequenci es in the 433mhz european licence exempt frequency band. these frequencies are non-overlapping and sim ultaneous operation of rdl2s in the same area on different channels will be possible. units are supp lied on 433.92mhz (ch0) as default. features conforms to european en 301 489-3 and etsi en 300 2 20-3 data rates up to 32kbps high performance double superhet, pll synthesizer usable range up to 300 metres external, 75 metres i n building saw front end filter and full screening low profile with small footprint 5 serial select wideband channels available as rdl2t transmitter and rdl2r receiver f or one-way communication applications pdas, organisers & laptops handheld / portable terminals epos equipment, barcode scanners in-building environmental monitoring and control remote data acquisition system, data logging fleet management, vehicle data acquisition technical summary operating frequency: 433.92mhz (default) supply: regulated 5v @ 28ma tx, 24ma rx transmit power: +10dbm (10mw) receiver sensitivity: -115dbm for 12db sinad adjacent channel rejection: 65db @ 320khz receiver blocking: 80db min. size: 33 x 23 x 7mm evaluation platforms : uni-eval (rdl special) rdl2 is a half-duplex multi channel wideband fm transceiver in a bim series footprint and operates on 433.05-434.79mhz european srd band. this makes the rdl2 ideally suited to those low power applications where low cost multi - channel operation is required. figure 1: rdl2-433-32 uhf multi channel wide band fm transceiver 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, 31 july 2012 rdl2
radiometrix ltd rdl2 data sheet page 2 figure 2: rdl2 b lock diagram
radiometrix ltd rdl2 data sheet page 3 18 17 16 15 14 13 12 11 10 0v vcc enable txd txe nc rxd setup 0v 12 3 4 5 6 7 8 9 rf gnd antenna rf gnd no pin 33 mm 30.48 mm 23 mm 7 mm side view (through can) top view (without can) side view (with can) recommended pcb hole size: 1.2 mm module footprint size: 25 x 32 mm pin pitch: 2.54 mm pins 4, 5, 6, 7, 8, 9 & 13 are not fitted figure 3: rdl2 footprint (top view) pin description pin name function 18 0v ground 17 vcc 5v regulated power supply (4.75 - 5.25v) 16 enable pull low to enable module 15 txe pull low to transmit 14 txd transmit data input ( 5v cmos logic. no pull up) 13 nc no pin 12 rxd receive data output ( 5v cmos logic output) 11 setup pull low to enter test/setup mode ( 5v cmo s logic. pullup present sometimes) 10 0v ground notes : 1. pinout is similar to a bim2a. on rf connector en d only pins 1,2,3 are present. 2. txd / rxd are a direct connection to the radio h ardware's baseband signals rf gnd pin 1 & 3 rf ground pin, internally connected to the module s creen and pin 8, 9, 10 and 18 (0v). this pin should be connected to the rf return path (e.g. co-axial cabl e braid, main pcb ground plane, etc). rf pin 2 50 rf input/output from the antenna, it is dc isolate d internally. (see antenna section for details). gnd pin 8, 9, 10 and 18 supply ground connection to ground plane and can. vcc pin 17 5v voltage regulator should be used to have a clean 5v supply to the module. a 4v regulator is used in side for radio circuitry. enable pin 16 active low enable pin. it has a 10k pull-up to vcc. it should be pulled low to enable the module.
radiometrix ltd rdl2 data sheet page 4 txe pin 15 active low enables transmitter. it has a 10k pull-up to vcc. (if used in rx only, tie this pin to +5v) txd pin 14 this is a 5v cmos logic level input. it can be dire ctly interfaced to data output of a uart in a microcontroller. txd does not have an internal pull -up. nc pin 13 there is no pin in this position. rxd pin 12 this is a 5v cmos logic level output. it can be dir ectly interfaced to data input of a uart in a microcontroller. setup pin 11 pull low to enter test/setup mode. this is only sam pled at power-up, and on tx>rx or rx>tx transitions . the pullup only enables at these times. programming the rdl2 as supplied, the rdl2 is set to default channel zer o. to change this preset, it is necessary to enter setup/program mode. the rdl2 is programmed through the same txd / rxd p ins that is used for sending/receiving data. an rs232 terminal emulator (such as aterm or hyperterm inal) is an ideal tool. to connect to a true rs232 device, inverting rs232- cmos level shifters must be used. maxim max232 or equivalent are ideal, but simple npn transistor swi tches with pull-ups often suffice. with typical microcontrollers and uarts, direct connection is po ssible. to enter program mode the setup pin (pin 11) must b e held low at turn-on, or during a change of txe pi n state. in this mode the radio link is disabled, but the txd / rxd pins become a 9600 baud programming interface. (bytes received are echoed back on the r xd pin). in 'setup' the unit will only respond to certain co mmand strings: chan0 to chan4 : these commands select one of 5 preset channels a rdl2 will only communicate with a unit set to the same channel. channel number is stored in volatile memory. on pow er-up the rdl2 reverts to the default i n eeprom (as supplied this is always channel 0) setprogram : writes the current address and current channel into eeprom as the new default. a tilda character (~, ascii 126dec) sent by the uni t indicates end of eeprom write sequence (these commands are normally only used for factory diagnostics) notone : transmit unmodulated carrier lftone : transmit carrier modulated with 8khz squarewave hftone : transmit carrier modulated with 16khz squarewave # : transmitter off a carriage return ?? (00dhex) should be entered after each command sequence to execute it. releasing the setup pin to high state returns the r dl2 to normal operation.
radiometrix ltd rdl2 data sheet page 5 condensed specifications frequency 433.92mhz ? chan0 (default channel) 433.28mhz ? chan1 433.60mhz ? chan2 434.24mhz ? chan3 434.56mhz ? chan4 frequency stability 10khz channel width 320khz number of channels 1 of 5, user programmed transmitter output power 10dbm (10mw) 1db tx on switching time <5ms modulation type fsk fm peak deviation +/-25khz tx spurious <-45dbm receiver sensitivity -115dbm for 12db sinad, 1khz tone, at t he analogue af test image -40db spurious / adjacent channel -60db blocking -80db min lo re-radiation <-60dbm interface data rate dc ? 32kbps (nrz) levels 5v cmos supply voltage 5v current 28ma transmit 24ma receive / idle interfaces user 9pin 0.1" pitch molex (pin 6 absent) rf 3pin 0.1" pitch molex size 33 x 23 x 7mm operating temperature -20 c to +70 c (storage -30 c to +70 c) spurious radiations compliant with etsi en 300 220- 3 and en 301 489-3
radiometrix ltd rdl2 data sheet page 6 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 16cm (1/4 wave @ 433mhz). k eep 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. feature a b c whip helical loop ultimate performance *** ** * easy of design set-up *** ** * size * *** ** immunity proximity effects * ** *** 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 4: antenna types
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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