PLT2

PLT2 RADIOMETRIX | Alldatasheet

Document overview

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Technical content

Features

/square4 Conforms to EN 300 220-3 and EN 301 489-3 /square4 High performance double superhet. PLL synthesizer with TCXO /square4 SAW front-end filter /square4 User interface speed: 9600bps for standard module /square4 Usable range over 1km /square4 Fully screened. Low profile /square4 Re-programmable via RS232 interface /square4 Low power requirements

Applications

/square4 Wireless handheld terminals /square4 EPOS equipment, barcode scanners /square4 Data loggers /square4 Industrial telemetry and telecommand /square4 In-building environmental monitoring and control /square4 High-end security and fire alarms /square4 DGPS systems /square4 Vehicle data up/download /square4 Heavy vehicle/machinery controls Technical Summary /square4 Operating frequency: 173.200 - 173.325MHz (UK band) o 150.825 - 152.450MHz (Australian Band) o 433.875 - 434.650MHz (EU band) o 458.525 - 459.1MHz (UK band) /square4 Other custom VHF and UHF bands /square4 32 channels @ 25kHz channel spacing /square4 Transmit power: +10dBm (10mW) / +20dBm (100mW) /square4 Supply range: 3.1 – 15V (TX @ 10mW and RX), 4.1 – 1 5V (TX @ 100mW) /square4 Current consumption: 34mA @ 10mW, 90mA @ 100mW (transmit) and 20mA (receive) /square4 Data bit rate: 5kbps max. (standard module) /square4 Receiver sensitivity: -118dBm (for 12 dB SINAD) /square4 Serial configuration by inverted RS232 at 3V CMOS level Evaluation platforms : NBEK + PL carrier Inexperienced users of ISM band radio modules often require a totally transparent interface. This can require considerable processing power, and buffer memory, to be provided in the radio device. The more experienced user, on the other hand, may not want to write a raw radio interface, but desires a module that gives more control over the datastream than a 'beginners' solution. The PL radios represent such a compromise solution. Figure 1: PLT2 transmitter and PLR2 receiver NBFM Multi channel Data Packet Link Radios Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com Issue 2, 30 July 2012 PLT / PLR

Radiometrix Ltd PLT/PLR Data Sheet page 2 PLT / PLR data packet link radios The PL modules use the hardware of the existing LMT/LMR transmitter receiver pair, combined with completely new firmware to produce a simple to use but readily controllable data link Both radios have a similar pinout. The bidirectional DATA pin requires an inverted RS232 data interface, at 3V CMOS logic levels (Both DATA and FLOW are bidirectional. As outputs they are open drain pins with 50K pullups to the internal Vcc, and 470 series protection resistors. Do not exceed 3v on these pins). The CMD pin selects the operating mode: If pulled low, then serial data is routed to a command interpreter (see 'programming') . If high (floating) then received bytes are loaded into the buffer (the PLR receiver only inputs data in command mode of course). When the buffer is full, the transmitter either sends a databurst immediately, or waits for a command from the user The transmitter data buffer size is pre-set by a user command (from 1-32 bytes) The data format uses is modified biphase at a peak data rate of 2500 bits per second. Each burst consists of a framing sequence, a two byte address, a two byte checksum, and a variable length (1-32 bytes) data 'payload'. The payload length information is coded into the framer sequence. Minimum length (1 byte) bursts take about 70mS (including all transmitter setup and power on/off timings), while a full 32 byte burst requires over 250mS. Data transfer rate is limited by the interface's inability to receive data while transmitting a burst (if FLOW is high, then the PLT is not listening to the serial port at all), or to decode received packets while in the process of outputting one The standard products use a 9600 baud user interface speed. Slower versions are also available (1200, 2400 and 4800 baud, with suffixes -1, -2, and -4). The baud rate is not user programmable.

Radiometrix Ltd PLT/PLR Data Sheet page 3 Figure 2: PLT block diagram

Radiometrix Ltd PLT/PLR Data Sheet page 5 Figure 5: PLR block diagram

Radiometrix Ltd PLT/PLR Data Sheet page 7 Serial interface commands A 9600 baud cmos level ‘inverted RS232 format’ (1 start bit, 8 data, 1or 2 stop bits, no parity) is used. Serial data is sent to the DATA (2b) pin. These units employs a sub-set of the programming commands used by standard LMT/LMR modules. As the DATA pin is dedicated to serial communication only, the ‘ENABLESERIALMODE’ command used for LMT/LMR string is NOT required. To successfully program the unit it must be in active state (RXE high, or TXE low), and CMD must be pulled low. Provision should be made to force the unit into this state while programming (either a jumper, or a third pin on the programming connector, could be used). The basic units do not provide local echo, but this is a provision on the evaluation interface boards Commands Function Note GOCHAN aa Serially select channel aa, (ch0 to ch3 1) Responds with OK LOAD aa nnnnn Set value of N register for channe l aa, (Channels 0 to 31) Responds with OK SINGLE nnnnn Direct override of N register value Responds with OK RVALUE rrrr Set value for R register Responds with OK AVALUE aaaaa Set value for unit address Responds with OK BVALUE bb Set buffer size (01 – 32, PLT only) Res ponds with OK SVALUE sss Set ascii value of 'send' character Re sponds with OK MVALUE mmm Set mode byte (0-255, PLT only) Respon ds with OK ADDR xxxxx Volatile short address No response CHAN aa Volatile channel select No response TEST Transmitter test (carrier on, 250Hz square wav e. PLT only) (any character sent to the unit will exit 'test' mode) <cr> Process entry Ascii 13 / Clear all buffers Ascii 47 < Clear data buffer Ascii 60 > send burst (if data buffer isn't empty) Ascii 62 aa = a two digit channel number from 00 to 31 (lea d zero is important ) bb = buffer size from 1 to 32 (lead zero is irre levant) mmm = mode byte value (0-255) (lead zero is irrel evant) sss = ascii value of 'send' character (0-255) (le ad zero is irrelevant) nnnnn = a synthesizer N register value, (up to 65535) rrrrr = the synthesizer R register value, (up to 16383) xxxxx = address (up to 65535) PLT = 17356 kHz 25 MHz 900 .433 f fN cing Channelspa RF TX === kHz 25 MHz 13 f fR cing channelspa TCXO == , So R=520 VHF PLT units have 10MHz, not 13MHz reference oscillators: kHz 25 MHz 10 f fR cing channelspa TCXO == , So R=400 (for VHF PLT) PLR = 16500 kHz 25 4 .21 MHz 900 .433 f MHz 4 .21 fN cing Channelspa RF RX =−=−= Note : A pause of at least 50ms must be allowed between command strings (EEPROM programming time).

Radiometrix Ltd PLT/PLR Data Sheet page 8 Operating principle On recieve, the FLOW output goes high at least 400uS (typically 480uS) before beginning of the start bit of the first byte out it goes low again 12uS after the end of the last byte stop-bit This output can be polled, or used as an interrupt, to detect the arrival of a data byte (or bytes) (tx measurements made on 32byte bursts, default mode 'send on buffer full) On transmit, the FLOW output goes high 80uS after the end of the 32nd byte (about 25-30mS after this point, the tx keys up and starts sending the burst) it returns to low when the transmitter has ramped fully down A 32 byte burst takes around 250mS to send, from first byte into tx, to last out of rx (it's about 218mS from the start of the first byte in to the FLOW output returning low) For a 32 byte burst, FLOW is high for about 185mS Although such asynchronous operation is not really recommended (especially for timing-uncertain devices like PCs, and especially when running high level languages and/or multiple applications), it is also possible to send a 32 byte burst roughly every 225mS, for an aggregate throughput of about 140 bytes per second (1400 baud) (this is not the intended operating mode for the devices, but it does give an idea of the capabilities) It would be much better (if maximum data rate was wanted) to send a (32byte) burst when the FLOW output is low The MODE byte This is a value stored in EEPROM, that selects the various operating functions of the radio. Be careful. By setting this incorrectly you can disable your radio link Factory default (send when buffer full, clear buffer on exit from setup mode) is selected by MVALUE 0 Functions of the mode byte bits. Bit0 when zero the PLT will send when it's buffer i s full Bit1 when zero the PLT clears the data buffer on ex it from command mode Bit2 set: send burst on entering command mode (if b uffer has any data in it) Bit3 set: send burst on stop-bit over-run (ie: seri al pin is low for more than 1.04mS) Bit4 set: clear data buffer on stop-bit over-run Bit5 set: send burst on receiving the character spe cified by SVALUE in the datastream Bit6 set: send burst if the gap following a charact er exceeds approx 4.2mS Bit7 reserved Additionally, there are a few command mode characters that can be used : > send burst (if data is present in the buffer) < clear data buffer Obviously: bit 3 and bit 4 should not be set at the same time bit 1 should be set if a command mode controlled send is used with a 'bouncy' CMD drive (switch) if bit 2 is set then it doesn't matter what bit 1 is doing ! Bit 6 (timeout mode) is best used with BVALUE 32 a nd other bits inactive To generate a stop-bit over-run, either pull down the serial input pin for over 1.04mS (1 byte at \` 9600 baud), Or send a 00 (null, CTRL @ character ) at a slower baud rate

Radiometrix Ltd PLT/PLR Data Sheet page 9 Condensed specifications Frequency 433MHz EU, 458MHz / 173MHz UK and 151MHz Australian bands As supplied: EU version: 433.875 - 434.65MHz UK version: 458.525 - 459.1MHz 173.200 - 173.325MHz Australian version: 150.825 - 152.450MHz And 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 µ 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 µ 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 PLT/PLR Data Sheet page 10 RX Received Signal Strength Indicator (RSSI) The PLR receiver has wide range RSSI that measures the strength of an incoming signal over a range of 60dB or more. This allows assessment of link quality and available margin and is useful when performing range tests. The output on pin 5b of the module has a standing DC bias of up to 0.5V with no signal, rising to 2.5V at maximum indication (RF input levels of -40dBm and above). ∆ Vmin-max is typically 2V and is largely independent of standing bias variations. Output impedance is 40k Ω . Pin 5b can drive a 100 µ A meter directly, for simple monitoring. 0.2 0.4 0.6 0.8 1.2 1.4 1.6 1.8 2.2 2.4 2.6 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 RF level (dBm) RSSI output (V) Figure 8: typical RSSI level with respect to received RF level at PLR antenna pin 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. Feature A B C whip helical loop Easy of design set-up * * Immunity proximity effects * * Range open ground to similar antenna 500m 200 100

Radiometrix Ltd PLT/PLR Data Sheet page 11 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. RF Figure 9: Antenna types (for 433MHz) band) Ordering Information: Part No. Descriptio n Frequency band (MHz) Supply (V) RF power (mW) Data rate VHF PLT1-173-9 Transmitter 173.200 - 173.325 3.1 -15 10 9600bps PLR1-173-9 Receiver 173.200 - 173.325 3.1 -15 96 00bps PLT1-151-9 Transmitter 150.825 - 152.450 4.1 -15 100 9600bps PLR1-151-9 Receiver 150.825 - 152.450 3.1 -15 96 00bps UHF 9600bps PLT2-433-9 Transmitter 433.875-434.650 3.1 -15 10 9600bps PLR2-433-9 Receiver 433.875-434.650 3.1 -15 9600 bps PLT2-458-9 Transmitter 458.525 - 459.1 4.1 -15 10 0 9600bps PLR2-458-9 Receiver 458.525 - 459.1 3.1 -15 9600 bps Notes : 1. The standard products use a 9600 baud user inter face speed. Slower versions are also available (1200, 2400 and 4800 baud, with suffixes -1, -2, and -4). e.g.: PLT1-173-4 (for 4800 baud) 2. PLT/PLR are available on number of other VHF and UHF frequencies. Other UHF band frequencies are subject to SAW filter availability. e.g. 315, 419, 429, 448, 465MHz etc

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/ 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