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| EW N Issue 3, 27 April 2007 Radiometrix Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233 HVR2 UHF Narrow Band FM Vibration Resistant Multi Channel Receiver The HVR2 receiver is the high vibration resistant version of the low cost RLC2 receiver. Its unique local oscillator design makes the unit almost immune to mechanical vibrations below 500Hz. This makes the HVR2 (with the matching TLC2H-433-5 transmitter) to be used in mechanically troublesome areas such as crane and machine tool control, and remote operated vehicles. Figure 1: HVR2-433-5 receiver Features * * * * * * * * * * * 433MHz version conforms to EN 300 220-3 and EN 301 489-3 High performance double superhet. PLL synthesizer with TCXO DDC local oscillator SAW front-end filter Data rates up to 5 kbps for standard module Usable range over 500m Fully screened. Low profile Feature-rich interface (RSSI, analogue and digital baseband) Re-programmable via RS232 interface Low power requirements Immune to mechanical vibration up to 500Hz Applications * * * * * * * * * Heavy vehicle/machinery (e.g. crane) controls Handheld terminals EPOS equipment, barcode scanners Data loggers Industrial telemetry and telecommand In-building environmental monitoring and control High-end security and fire alarms DGPS systems Vehicle data up/download Technical Summary * * * * * * * Operating frequency: 433.05 - 434.775MHz 32 channels Supply voltage: 3.7 - 15V Current consumption: 30mA (receive) Data bit rate: 5kbps max. Receiver sensitivity: -120dBm (for 12 dB SINAD) Serial configuration by inverted RS232 at 3V CMOS level Radiometrix Ltd HVR2 Data Sheet page 1 Radiometrix Ltd HVR2 Data Sheet Figure 4: HVR2 block diagram page 2 Figure 5: HVR2 footpint (top view) Pin description Pin 1 2 3 4 5 S0/PGM S1 S2 S3 Jumper S4 Name Vcc RSSI 0V RXD AF Parallel channel select, bit 0 Parallel channel select, bit 1 Parallel channel select, bit 2 Parallel channel select, bit 3 Parallel channel select, bit 4 Function DC supply (3.7V to 15V, at 30mA). 0.5V-2.5V DC level. 60dB dynamic range. 40k output impedance Ground Open collector digital data output with internal 47k pull-up to Vcc 600mV pk-pk audio. DC coupled, approx 0.8V bias. True logic (0V = low). Weak pullup to 3.5V Serial frequency programming / configuration1 True logic (0V = low). Weak pullup to 3.5V True logic (0V = low). Weak pullup to 3.5V True logic (0V = low). Weak pullup to 3.5V Jumper is soldered (S4=0), Selects Channel 16 to Channel 31 at 50kHz step. NOTES: 1. Serial programming is by a 2400 baud inverted 'RS232' (3V CMOS levels) datastream applied to the S0 pin. If connection to a true RS232 port is desired, then a suitable inverting level shifter / buffer (MAX232 or NPN switch transistor) is needed. 2. Parallel channel select is by a 4 pin parallel input (MSB selected by jumper). 3V CMOS levels should be used. 3. As supplied the frequency table is thus: ch 16-31 433.9 - 434.65 MHz (50KHz steps) ch 0-15 433.875 - 434.625 MHz (50KHz steps) Channels 00-15 cannot be accessed by the parallel port , only by a serial GOCHAN command. This format maintains compatibility with the low cost RLC2 receivers (which are supplied with their S4 jumpers unfitted therefore accessing channels 00-15). If no connection is made to the ports, the unit operates on channel 31 (434.65MHz). Radiometrix Ltd HVR2 Data Sheet page 3 Serial interface commands HVR2 frequency/channel can be serially configured using HyperTerminal or any other terminal program configured with following setup: 2400 baud RS232. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits. Serial data is sent to the unit on one of the parallel channel select pins (S0). It is very important that the unit does not 'decode' switch bounce in ordinary operation as a command string, or spurious rewriting of the EEPROM will result. For this reason the user must send the 16 character string ENABLESERIALMODE to fully enable the serial command mode before sending any of the command strings listed below. Command mode is disabled on power down, or on reception of a # character. Owing to the complex nature of the DDS programming in the HVR2, the user does not have direct access to the synthesizer registers (as is the case in the simpler RLC2). Instead, the user has a table of 32 channels (accessible by parallel port, or by the GOCHAN command). Each of these channels can be assigned to one of the HVR2's pre-set frequencies (433.05 - 434.775MHz) (note: the parallel port accesses the higher 16 channels, from 16-31, as if a '5th parallel select bit' is always `low'). GOCHAN aa HOPPER nn LOAD aa nn SETPAR SETSER aa = a two digit channel number from 00 to 31 (values 00-15 can only be selected by a GOCHAN command) nn= abstract `frequency number' relating to one of the pre-set operating frequency Channel frequency = 433.05 + (nn x 0.025) MHz For example: nn = 01 relates to a channel frequency of 433.075MHz, and the commnd: LOAD 00 01 will set channel number 0 to 433.075MHz Note: A pause of at least 25ms must be allowed between command strings (EEPROM programming time). The HVR2 has no equivalent to the RLC2 'SINGLE' command. The 'HOPPER' command provides some similarity, but on power up (or SETPAR, SETSER or GOCHAN command) the radio reverts to ordinary operation. Radiometrix Ltd HVR2 Data Sheet page 4 Condensed specifications Frequency Frequency stability Channel spacing Number of channels 433.05-434.775MHz 1.5kHz 25kHz 32 channels selected via RS232 interface or 16 channels by parallel port -10 C to +60 C (Storage -30 C to +70 C) Compliant with ETSI EN 300 220-3 and EN 301 489-3 Operating temperature Spurious radiations Interface User Channel RF Sensitivity S/N ratio AF bandwidth (-3dB) image / spurious / adjacent channel Blocking LO re-radiation Supply Voltage Current Outputs Size Channel to channel hop Power on to valid audio Power on to stable data out (50:50 mark / space) 5pin 0.1" pitch molex 4pin 0.1" pitch molex 2pin 0.1" pitch molex -112dBm for 1 part per 1000 BER -120dBm for 12 dB SINAD 25dB (min), 30dB (typ) on AF output 4kHz <-55dB <-85dB <-60dBm 3.7V - 15V 30mA RSSI, audio, data 50 x 30 x 10mm <5ms <10ms <10ms Notes: 1. The data slicer cannot be depended upon for data waveform frequencies below 250Hz 2. When RX is on and a transmitter keys up, again a 10ms period is required to stabilise data output mark/space. i.e. allow at least 10ms of preamble The high vibration resistant HVR2 receiver differ from the Low Cost RLC2 receiver in the following key features: Footprint Frequency band Channels Parallel channel select SAW front end filter Supply Spurii Sensitivity Ultimate S/N Start up time (preamble) Channel to channel hop Reprogramming (frequency) Vibration resistant Local Oscillator HVR2 Industry standard 433.05 - 434.775MHz 32 serial, 16 parallel 4 pins Yes 3.7V-15, 30mA <-55dB -120dBm 25dB (min), 30dB (typical) <10ms <5ms Limited High, up to 500Hz Direct Digital Synthesiser (DDS) RLC2 Industry standard 433 - 435 MHz 32 parallel/serial 4 pins (and 1 jumper link) Yes 3.7V-15, 18mA <-60dB -120dBm 35dB (min), 40dB (typical) ~50ms ~25ms Full Limited Voltage controlled (VCO) Radiometrix Ltd HVR2 Data Sheet page 5 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 connected 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-tuning. Whips are ground plane sensitive and will benefit from internal 1/4 wave earthed radial(s) if the product is small and plastic cased Wire coil, connected directly to RF pin, open circuit 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. A loop of PCB track tuned by a fixed or variable capacitor to ground at the 'hot' end and fed from RF pin at a point 20% from the ground end. Loops have high immunity to proximity de-tuning. B) Helical C) Loop Ultimate performance Easy of design set-up Size Immunity proximity effects Range open ground to similar antenna A whip *** *** * * 500m B helical ** ** *** ** 200 C loop * * ** *** 100 The antenna choice and position directly controls the system range. Keep it clear of other metal in the system, particularly the 'hot' end. The best position 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 other metal components, particularly large ones like transformers, batteries and PCB tracks/earth plane. The space around the antenna is as important as the antenna itself. 0.5 mm enameled copper wire close wound on 3.2 mm diameter former RF 433 MHz = 24 turns A. Helical antenna Feed point 15% to 25% of total loop length RF-GND C2 C3 C4 C1 track width = 1mm 4 to 10 cm inside area 2 RF B. Loop antenna 16.4cm RF wire, rod, PCB-track or a combination of these three 433 MHz = 16.4 cm total from RF pin. C. Whip antenna Figure 6: Antenna types Radiometrix Ltd HVR2 Data Sheet page 6 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 copyrighted 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 believed 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 Ltd does not assume any liability arising from the application or use of any product or circuit described herein, nor for any infringements of patents or other rights of third parties which may result from the use of its products. This data sheet neither states nor implies warranty of any kind, including fitness for any particular application. These radio devices may 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 particular equipment. Further details are available on The Office of Communications (Ofcom) web site: http://www.ofcom.org.uk/radiocomms/ifi/licensing/licensing_policy_manual/ Information Requests Ofcom Riverside House 2a Southwark Bridge Road London SE1 9HA Tel: +44 (0)845 456 3000 or 020 7981 3040 Fax: +44 (0)20 7783 4033 information.requests@ofcom.org.uk European Radiocommunications Office (ERO) Peblingehus Nansensgade 19 DK 1366 Copenhagen Tel. +45 33896300 Fax +45 33896330 ero@ero.dk www.ero.dk |
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