TX2M

TX2M RADIOMETRIX | Alldatasheet

Document overview

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Technical content

Features

/square4 433MHz version conforms to EN 300 220-3 and EN 301 489-3 and 458MHz version to MPT 1329 (UK specs) /square4 Any custom band between 420MHz and 480MHz with 5MHz (AR0) frequency range /square4 High performance double superhet, 128 channel PLL synthesizer with TCXO /square4 Data rates up to 5 kbps for standard module /square4 Usable range over 1km /square4 Fully screened. Low profile /square4 Feature-rich interface (RSSI, automatic noise squelch, analogue and digital baseband) /square4 Incorporate a 1200baud dumb modem /square4 Re-programmable via RS232 interface /square4 Low power requirements

Applications

/square4 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 Vehicle data up/download Technical Summary /square4 Size: 59 x 38 x 7mm /square4 Operating frequency: 458.5-459.1MHz or 433.05-434.79MHz /square4 23 channels in 458MHz band (128 channels max.) /square4 Transmit power: +20dBm (100mW) nominal /square4 Supply range: 4.5V - 16V /square4 Current consumption: 100mA transmit, 13mA receive /square4 Data bit rate: 5kbps max. (standard module) /square4 Receiver sensitivity: -118dBm (for 12 dB SINAD) Evaluation platforms: NBEK + XX2M carrier The TX2M transmitter and RX2M receiver modules offer a low power, reliable data link in an industry-standard pin out and footprint. This makes the TX2M/RX2M pair ideally suited to those low power applications where existing wideband modules have insufficient range, or where multi-channel operation is needed. Two versions are available, covering the 458.5- 459.1MHz UK band (at 100mW) and the European 433.05 -434.79MHz band. RX2M -458 -5 TX2I -458 -5 UHF NBFM multi channel radio modules 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 3, 02 August 2012 TX2 M /RX2M

Radiometrix Ltd TX2M/RX2M Data Sheet page 2 Figure 1: TX2M block diagram

Radiometrix Ltd TX2M/RX2M Data Sheet page 3 Figure 2: RX2M block diagram

Radiometrix Ltd TX2M/RX2M Data Sheet page 4 Pin Description - TX2M Figure 3: TX2M Footprint (Top) view Pin Name Function 1A +Vin +4.5-16V 2A Gnd Ground 1B Gnd RF ground 2B RF out To the antenna 3B Gnd RF ground 1C 0V Ground 2C TXE Transmitter enable. Low = ON, open = off. 4 k7 internal pullup to Vcc 3C TXD DC coupled input for 3-12V CMOS logic. Leave open if unused 4C AF in AC coupled Analogue Input. Limit to 1V pk-pk ±10% to keep distortion <1.5% and peak FM deviation >2.5kHz 5C +4.4Vout DC supply. 75mA maximum drain. Only pre sent when TXE is low 6C PGM Serial programming/configuration input at RS 232 level 7C 0V Ground 8C P1 (MOD TXD) Parallel frequency select inputs. Inverted logic, 10k pullups to 4V 9C P2 (MOD NC) 10C P3 (MOD TXH) Notes : 1. Internal AF Input gain is factory set for 1V pk-pk to produce 3kHz peak deviation and minimum distortion. Analogue gain may be set for an input level of 50mV – 2V pk-pk . This cannot be done without appropriate test equipment. Contact factory for details 2. With 1200baud modem mode enabled, parallel selection of channel is unavailable as the P1-P3 lines are used for input/output operations.

Radiometrix Ltd TX2M/RX2M Data Sheet page 5 Pin Description - RX2M Figure 4: RX2M Footprint (Top) view Pin Name Function 1A +Vin +4.5-16V 2A Gnd Ground 1B Gnd RF ground 2B RF out To the antenna 3B Gnd RF ground 1C RSSI DC level between 0.5V and 2.5V. 60dB dynam ic range 2C SQF Noise operated carrier detect. Open collecto r. ON/low = no signal 3C AF out 200mV pk -pk audio. DC coupled, approx 1V bias. Muted by squelch 4C RXD Open collector output of data slicer. Need e xternal pull-up 5C +4.4V out DC supply. 75mA maximum drain. Present if unit is powered. 6C 0V Ground 7C PGM Serial programming/configuration input at RS 232 level 8C P1 (MOD NC) Parallel frequency select inputs. Inverted logic, 10k pullups to 4V 9C P2 (MOD RXD) 10C P3 (MOD CDE) Notes: 1. Carrier detect on RX2M mutes the AF and DATA out puts when RF input signal is <-123dBm. This can be factory disabled if required. 2. There are no pullups on the open collector outpu ts. External pull-up resistor should be used. 3. With 1200baud modem mode enabled, parallel selection of channel is unavailable as the P1-P3 lines are used for input/output operations.

Radiometrix Ltd TX2M/RX2M Data Sheet page 6 TX2M and RX2M serial interface commands 2400 baud at RS232 level. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits, No flow control. Transmit (pin 3 on DB9) and Signal Ground (pin 5 on DB9) should be connected to PGM and 0V pin. Command Format Description SINGLE nnnnn Set value of N for single channel ope ration GOCHAN xx Serial select of channel xx (0 to 127) LOADMX xx Set highest permitted (serial selected) channel xx (others default to ch0) LOADaa nnnnn Set value of N for channel aa (channel s 0 to 15) LOADTB nnnnn Set value of N for channel 16 (channel s 17 to 127 then in sequence) RVALUE rrrr Enter value for R register SETPAR Channel selected by 3 bit parallel input (0 to 7). Disable modem SETSER Channel selected by most recent GOCHAN opera tion SETMOD Enable internal modem. Frequency selected by most recent GOCHAN or SINGLE GOTEST 250Hz test tone modulated transmission <CR> Process entry (Carriage Return = 0D hex ) / Clear all buffers xx = channel number from 00 to 127 aa = two digit channel number from 00 to 15 nnnnn = synthesizer N register value, (up to 65535) rrrr = synthesizer R register value, (up to 16383) 17322 25 050 .433 === kHz MHz f fN cing Channelspa RF TX kHz MHz f fR cing channelspa TCXO 13 == , So R=520 16466 25 MHz f MHz fN cing Channelspa RF RX Channel Number 433MHz band N value for TX N value for RX 458MHz band N value for TX N value for RX 0 433.050 /LOAD00 17322 /LOAD00 16466 458.525 /LOAD00 18341 /LOAD00 17485 1 433.075 /LOAD01 17323 /LOAD01 16467 458.550 /LOAD01 18342 /LOAD01 17486 2 433.100 /LOAD02 17324 /LOAD02 16468 458.575 /LOAD02 18343 /LOAD02 17487 3 433.125 /LOAD03 17325 /LOAD03 16469 458.600 /LOAD03 18344 /LOAD03 17488 4 433.150 /LOAD04 17326 /LOAD04 16470 458.625 /LOAD04 18345 /LOAD04 17489 5 433.175 /LOAD05 17327 /LOAD05 16471 458.650 /LOAD05 18346 /LOAD05 17490 6 433.200 /LOAD06 17328 /LOAD06 16472 458.675 /LOAD06 18347 /LOAD06 17491 7 433.225 /LOAD07 17329 /LOAD07 16473 458.700 /LOAD07 18348 /LOAD07 17492 8 433.250 /LOAD08 17330 /LOAD08 16474 458.725 /LOAD08 18349 /LOAD08 17493 9 433.275 /LOAD09 17331 /LOAD09 16475 458.750 /LOAD09 18350 /LOAD09 17494 10 433.300 /LOAD10 17332 /LOAD10 16476 458.775 /LOAD10 18351 /LOAD10 17495 11 433.325 /LOAD11 17333 /LOAD11 16477 458.800 /LOAD11 18352 /LOAD11 17496 12 433.350 /LOAD12 17334 /LOAD12 16478 458.825 /LOAD12 18353 /LOAD12 17497 13 433.375 /LOAD13 17335 /LOAD13 16479 458.850 /LOAD13 18354 /LOAD13 17498 14 433.400 /LOAD14 17336 /LOAD14 16480 458.875 /LOAD14 18355 /LOAD14 17499 15 433.425 /LOAD15 17337 /LOAD15 16481 458.900 /LOAD15 18356 /LOAD15 17500 16 433.450 /LOADTB 17338 /LOADTB 16482 458.925 /LOADTB 18357 /LOADTB 17501 F max 434.775 /LOADMX 69 /LOADMX 69 459.100 /LOADMX 23 /LOADMX 23 Please observe the following ERC/REC 70-03 (April 2004) Annex 1 recommendation when using the Non- specific Short Range Device (SRD) band for Telemetry, Telecommand, Alarms, Data in general and other similar applications. Frequency Band ERP Duty Cycle Channel spacing Notes E (433.050 - 434.790MHz) 10mW <10% No spacing Audio and voice signals should be avoided in the band 433.050MHz - 434.790MHz Power density limited to -13dBm/10 kHz for wideband channels with a bandwidth greater than 250 kHz E1 (433.050 - 434.790MHz) 1mW <100% No spacing E2 (434.040 - 434.790MHz) 10mW <100% <25kHz

Radiometrix Ltd TX2M/RX2M Data Sheet page 8 Pin description of TX2M/RX2M with Modem mode selected The 'modem' mentioned is a 1200 baud RS232 semi-intelligent unit (Transmitter is enabled when valid serial data is present, so no separate Transmit Enable control is needed. Coding in the data stream also permits the receiver to ignore noise and only output valid serial data. Pin Description - TX2M Pin Name Function 1 0V Ground

2 TXE Must be tied to 0V

3 N/C

4 N/C

5 +4.4Vout DC supply. 75mA maximum drain. Only pres ent when TXE is low

6 PGM Serial programming/configuration input at RS2 32 level

8 MOD TXD (P1) Serial data input at RS232 level

9 MOD N/C (P2)

10 MOD TXH (P3) Active Low Transmit Hold for contin uous transmission (useful for test)

1 RSSI DC level between 0.5V and 2.5V. 60dB dynami c range (only valid during databursts)

2 N/C

3 N/C (modem tones or noise present)

4 N/C (modem tones or noise present)

5 +4.4V out DC supply. 75mA maximum drain. Present if unit is powered 6 0V Ground

7 PGM Serial programming/configuration input at RS2 32 level

8 MOD N/C (P1)

9 MOD RXD (P2) Modem Received Data at TTL level (re quires RS232 driver)

10 MOD CDE (P3) Pull low to enable Carrier Detect o n modem operation (not recommended)

Both the TX2M and the RX2M should be configured to required operating frequency using GOCHAN command before starting to use the internal 1200 baud modem, because the P1-P3 pins will be used as Modem Data pins and the modem will operate on the last serially selected channel after SETMOD command is used to enable the Modem. NC (C2) +4.4V out (C5) GND (C6) (C7) MOD RXD (C9) PGM RX2M 4.5 - 15V Antenna 0V (C1) PGM (C6) (C7) TXE (C2) GND TX2M 3TXD SGD PC serial port 4.5 - 15V Antenna

3 TXD

100k Ω 100k Ω NPN uC UART µ C U AR T 4.4V 0ut (C5) MOD TXD (C8) Figure 5: TX2M and RX2M interfaced to PC serial port in modem mode Note : Baud rate used for Modem is half that of used for serial configuration. Attached RS232 devices should be set with the following: 1200bps, 8 Data bits, No Parity, 1/2 stop bits, no flow control For TX2M, TXD (Pin 3) of a Serial Port can be switched from PGM (Pin C6) to MOD TXD (Pin C8) with no RS232 driver in between. However, in RX2M, MOD RXD (Pin C9) requires an RS232 line driver before it can be connected to RXD (pin 2) of a serial port. Some of the RS232 line drivers can be powered from the regulated +4.4V out (Pin C5).

Radiometrix Ltd TX2M/RX2M Data Sheet page 9 Condensed specifications Frequency 458.5-459.1MHz or 433-434MHz (any 5MHz b and from 420-480MHz) Frequency stability +/- 1.5kHz Channel spacing 25kHz (12.5kHz by special order) Number of channels 128 channels controlled via RS232 interface (8 parallel selected) Supply voltage 4.5-16V Current 100mA nominal transmit 13mA receive Operating temperature -10 to +60 οC (Storage -30 to +70 οC) Size 59 x 38 x 7 mm Spurious radiations Compliant with ETSI EN 300 220- 3 and EN 301 489-3 Interface user 8pin 0.1" pitch molex Power 2pin 0.1" pitch molex RF 3pin 0.1" pitch molex Recommended PCB hole size 1.2mm (min.) Intended approval ETSI Radio standard EN 300 220-3 and EMC standard EN 301 489-3 Transmitter Output power +20dBm(100mW) ± 1dB (factory adjustable 1 - 100mW) TX on switching time 50 ms Modulation type FM, FSK (F1D, F3D) TX modulation bandwidth DC – 3kHz Adjacent channel TX power -37dBm Inputs analogue, data (CMOS/TTL compatible) Receiver Sensitivity -112dBm for 1 part per 1000 BER -118dBm for 12 dB SINAD image / spurious -70dB Blocking -85dB adjacent channel <-60dB (Tested per. ETSI EN 301 489-3 Outputs RSSI, carrier detect, audio, data Power on to valid audio 28ms (no noise mute) Power on to valid audio 45ms (with noise mute) Power on to stable data out 50ms for 50:50 mark / space (with or without mute) 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 50ms period is required to stabilise data output mark/space. i.e. allow at least 50ms of preamble Typical current consumption of TX2M at various RF output power level is as follows: RF output (mW) Current (mA) 100 90 50 67 25 54 10 41 5 35 1 30 Note : These measurements taken at 433MHz (for 458MHz current consumption increases by about 5%). RF power output can only be factory set.

Radiometrix Ltd TX2M/RX2M Data Sheet page 10 Operating principle of internal modem This device is a simplex link handling a 1200 baud asynchronous datastream (1 start, 8data, 1stop). Buffering in the transmit end handles TX startup ti ming requirements, while the presence of sync codes in the transmitted bursts prevents the receiver from o utputting garbage in the presence of noise. No erro r correction or retransmission of lost packets is sup ported. To operate with proper +/-12V RS232 levels an external buffer (such as a MAX232) will be needed Physically the modem code resides in the PIC microc ontroller which controls the radio functions. The modem uses the internal hardware serial port of the processor. Operation: Serial interface Both transmit and receive modems implement a 32 byt e software FIFO. At the transmit end this is used t o allow for the TX2M transmitter start up time (about 32mS), while on receive it buffers arriving packet s to the constant output data rate. All timing and data form atting tasks are handled by the software. The user need not worry about keying the transmitter before sending data: the link is entirely transparent. For transmission across the link data is formatted into packets, each comprising 3 bytes of data and a sync code. If less than 3 bytes are in the transmit end FIFO then a packet is still sent, but idle state re places the unused bytes. When the transmit end FIFO is completely emptied, then the transmitter is keyed off . Operation: Radio interface Raw data is not fed to the radios. A coding operati on in the transmit software, and decoding in the re ceiver, isolate the AC coupled, potentially noisy baseband radio environment from the datastream. The radio link is fed a continuous tone by the mode m. As in biphase codes, information is coded by var ying the duration consecutive half-cycles of this tone. In our case half cycles of 500 µ s (a long, or L) and 250 µ s (a short, or S) are used. In idle (or 'preamble') state, a sequence of Ls is sent (resembling a 1kHz tone). A packet comprises the Synchronising (or address) p art : LSSSSSSSSSSSSL followed by the Data part, made up of twelve Groups (of four half cycles durat ion). Each Group encodes 2 data bits, so one byte is encoded by 4 Groups. Although there are 16 possible states for a four half cycle group (from SSSS to LLLL), only four of the possible states are used for valid data: All other possible group combinations (except LLLL) are void, and result in the entire packet being rejected void the packet, as a packet containing less than 3 bytes still needs to be decoded. The advantage of using the above coding technique: 1.Ease of decoding: Unlike biphase, where a bit is coded as either a long half cycle or a short cycle, here all half cycles are detected separately. 2. Inherent error detection: Although only 14 sync/ address 'bits' (halfcycles) are used, the following 48 'bits' (halfcycles) only code 24 real data bits, leading to enhanced noise/error discrimination (the equivalent of 5 more sync bits). 3. Comparable spectral efficiency: For a maximum transmitted baseband frequency of 2kHz, a 3 byte packet is sent in 22ms. An equivalent biphase coded packet (comprising 19 sync + 24 data + 3 null flags) at 2kbits/sec takes 23ms

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