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EW N
Issue 3, 15 October 2007
Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
TX2M/RX2M
UHF Narrow Band FM multi channel radio modules
UK Version: TX2M-458-5/RX2M-458-5 (100mW) European version: TX2M-433-5/RX2M-433-5 (10mW) 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 458.5459.1MHz UK band (at 100mW) and the European 433.05-434.79MHz band.
RX2M-458-5
TX2I-458-5
Features
! ! ! ! ! ! ! ! ! ! 433MHz version conforms to EN 300 220-3 and EN 301 489-3 and 458MHz version to MPT 1329 (UK specs) Any custom band between 420MHz and 480MHz with 5MHz (AR0) frequency range High performance double superhet, 128 channel PLL synthesizer with TCXO Data rates up to 5 kbps for standard module Usable range over 1km Fully screened. Low profile Feature-rich interface (RSSI, automatic noise squelch, analogue and digital baseband) Incorporate a 1200baud dumb modem Re-programmable via RS232 interface Low power requirements
Applications
! ! ! ! ! ! ! Handheld terminals EPOS equipment, barcode scanners Data loggers Industrial telemetry and telecommand In-building environmental monitoring and control High-end security and fire alarms Vehicle data up/download
Technical Summary
! ! ! ! ! Size: 59 x 38 x 7mm Operating frequency: 458.5-459.1MHz or 433.05-434.79MHz 23 channels in 458MHz band (128 channels max.) Transmit power: +20dBm (100mW) nominal Supply range: 4.5V - 16V Current consumption: 100mA transmit, 13mA receive Data bit rate: 5kbps max. (standard module) Receiver sensitivity: -118dBm (for 12 dB SINAD)
TX2M/RX2M Data Sheet page 1
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Radiometrix Ltd
Radiometrix Ltd
TX2M/RX2M Data Sheet
Figure 1: TX2M block diagram
page 2
Radiometrix Ltd
TX2M/RX2M Data Sheet
Figure 2: RX2M block diagram
page 3
Pin Description - TX2M Pin: A 1 2 Pin: B 1 2 3 Name +Vin Gnd Name Gnd RF out Gnd Function +4.5-16V Ground Function RF ground To the antenna RF ground Figure 3: TX2M Footprint (Top) view Function Ground Transmitter enable. Low = ON, open = off. 4k7 internal pullup to Vcc DC coupled input for 3-12V CMOS logic. Leave open if unused AC coupled Analogue Input. Limit to 1Vpk-pk 10% to keep distortion <1.5% and peak FM deviation >2.5kHz DC supply. 75mA maximum drain. Only present when TXE is low Serial programming/configuration input at RS232 level Ground Parallel frequency select inputs. Inverted logic, 10k pullups to 4V
Pin: C 1 2 3 4 5 6 7 8 9 10
Name 0V TXE TXD AF in +4.4Vout PGM 0V P1 (MOD TXD) P2 (MOD NC) P3 (MOD TXH)
Pin Description - RX2M Pin A 1 2 Pin B 1 2 3 Name +Vin Gnd Name Gnd RF out Gnd Function +4.5-16V Ground Function RF ground To the antenna RF ground Figure 4: RX2M Footprint (Top) view Pin C Name Function 1 RSSI DC level between 0.5V and 2.5V. 60dB dynamic range 2 SQF Noise operated carrier detect. Open collector. ON/low = no signal 3 AF out 200mVpk-pk audio. DC coupled, approx 1V bias. Muted by squelch 4 RXD Open collector output of data slicer. Need external pull-up 5 +4.4V out DC supply. 75mA maximum drain. Present if unit is powered. 6 0V Ground 7 PGM Serial programming/configuration input at RS232 level 8 P1 (MOD NC) Parallel frequency select inputs. Inverted logic, 10k pullups to 4V 9 P2 (MOD RXD) 10 P3 (MOD CDE) NOTES: 1. Internal AF Input gain is factory set for 1Vpk-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. Carrier detect on RX2M mutes the AF and DATA outputs when RF input signal is <-123dBm. This can be factory disabled if required. 3. There are no pullups on the open collector outputs. External pull-up resistor should be used.
4. 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 4
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 Description Format SINGLE nnnnn Set value of N for single channel operation 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 (channels 0 to 15) LOADTB nnnnn Set value of N for channel 16 (channels 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 operation SETMOD Enable internal modem. Frequency selected by most recent GOCHAN or SINGLE GOTEST 250Hz test tone modulated transmission 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)
N TX =
f RF f Channelspacing
=
433.050 MHz = 17322 25kHz
R=
fTCXO f channelspacing
=
13MHz , So R=520 25kHz
N RX =
f RF - 21.4 MHz 433.050 MHz - 21.4 = = 16466 fChannelspacing 25kHz
433MHz band 433.050 433.075 433.100 433.125 433.150 433.175 433.200 433.225 433.250 433.275 433.300 433.325 433.350 433.375 433.400 433.425 433.450 434.775 N value for TX /LOAD00 17322 /LOAD01 17323 /LOAD02 17324 /LOAD03 17325 /LOAD04 17326 /LOAD05 17327 /LOAD06 17328 /LOAD07 17329 /LOAD08 17330 /LOAD09 17331 /LOAD10 17332 /LOAD11 17333 /LOAD12 17334 /LOAD13 17335 /LOAD14 17336 /LOAD15 17337 /LOADTB 17338 /LOADMX 69 N value for RX /LOAD00 16466 /LOAD01 16467 /LOAD02 16468 /LOAD03 16469 /LOAD04 16470 /LOAD05 16471 /LOAD06 16472 /LOAD07 16473 /LOAD08 16474 /LOAD09 16475 /LOAD10 16476 /LOAD11 16477 /LOAD12 16478 /LOAD13 16479 /LOAD14 16480 /LOAD15 16481 /LOADTB 16482 /LOADMX 69 458MHz band 458.525 458.550 458.575 458.600 458.625 458.650 458.675 458.700 458.725 458.750 458.775 458.800 458.825 458.850 458.875 458.900 458.925 459.100 N value for TX /LOAD00 18341 /LOAD01 18342 /LOAD02 18343 /LOAD03 18344 /LOAD04 18345 /LOAD05 18346 /LOAD06 18347 /LOAD07 18348 /LOAD08 18349 /LOAD09 18350 /LOAD10 18351 /LOAD11 18352 /LOAD12 18353 /LOAD13 18354 /LOAD14 18355 /LOAD15 18356 /LOADTB 18357 /LOADMX 23 N value for RX /LOAD00 17485 /LOAD01 17486 /LOAD02 17487 /LOAD03 17488 /LOAD04 17489 /LOAD05 17490 /LOAD06 17491 /LOAD07 17492 /LOAD08 17493 /LOAD09 17494 /LOAD10 17495 /LOAD11 17496 /LOAD12 17497 /LOAD13 17498 /LOAD14 17499 /LOAD15 17500 /LOADTB 17501 /LOADMX 23
Channel Number 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 F max
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. ERP Frequency Band Duty Channel Notes Cycle spacing E (433.050 - 434.790MHz) 10mW <10% No spacing Audio and voice signals should be E1 (433.050 - 434.790MHz) 1mW <100% No spacing avoided in the band 433.050MHz 434.790MHz E2 (434.040 - 434.790MHz) 10mW <100% <25kHz Power density limited to -13dBm/10 kHz for wideband channels with a bandwidth greater than 250 kHz
Radiometrix Ltd TX2M/RX2M Data Sheet page 5
Set parallel frequency select mode Go to Channel 3 (458.600MHz) Go to Channel 13 (458.850MHz) Go to Channel 23 (459.100MHz maximum allowed Channel) Go to Channel 22 (459.075MHz) TX2M will wrap around to Ch0 if >Ch23 (459.100MHz) Increase highest channel to Ch30 (out of 458MHz band) Go to new maximum Channel 30 (459.275MHz) Reset the maximum Channel to regulatory band limit Ch16 onwards changed from 458.925MHz to 459.000MHz Go to new Ch18 frequency of 459.050MHz (not 458.975MHz) Go to new maximum Ch23 frequency of 459.175MHz Reset Ch16 onwards from 458.925MHz (within regulatory band) Clear buffer and return to parallel channel selection Clear buffer and go to last serially selected Ch23 (458.925MHz) Return serially selected Channel to 0 (458.525MHz) Return to channel selected by parallel pins (P1-P3) levels Jump to 459.500MHz without storing it on EEPROM Enable internal 1200baud modem Enable internal 250Hz square wave modulated test transmission
Figure 5: Serial configuration of TX2I-458-5 transmitter using HyperTerminal
25kHz
433.05
434.79
433MHz Band 458MHz Band
459.1 461.675
Figure 6: Maximum allowed and programmable channels Notes: 1. A pause of at least 50ms must be allowed between command strings (EEPROM programming time) SINGLE mode does not store the N value in EEPROM. Therefore the unit is inoperative after a power down until either another valid SINGLE command is received, or mode is changed by a GOCHAN, SETPAR or SETSER command. SINGLE mode is intended for frequency agile applications. 2. /SETPAR command should be issued at the end of channel programming to put the module back into parallel frequency select mode 3. In 458MHz band, channel 12 (458.825MHz) and channel 15 (458.900MHz) are allocated specifically for fixed alarm and radio keys/vehicle paging applications respectively and should not be used for general purpose applications.
Radiometrix Ltd
TX2M/RX2M Data Sheet
page 6
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 1 0V 2 TXE 3 N/C 4 N/C 5 +4.4Vout 6 PGM 7 0V 8 MOD TXD (P1) 9 MOD N/C (P2) 10 MOD TXH (P3) Function Ground Must be tied to 0V
DC supply. 75mA maximum drain. Only present when TXE is low Serial programming/configuration input at RS232 level Ground Serial data input at RS232 level Active Low Transmit Hold for continuous transmission (useful for test)
Pin Description - RX2M Pin Name Function 1 RSSI DC level between 0.5V and 2.5V. 60dB dynamic 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 RS232 level 8 MOD N/C (P1) 9 MOD RXD (P2) Modem Received Data at TTL level (requires RS232 driver) 10 MOD CDE (P3) Pull low to enable Carrier Detect on 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.
Antenna
0V (C1) TXE (C2)
Antenna NC (C2)
PC serial port
1 2 3 4 SGD 5
2400bps
TX2M
4.4V 0ut (C5)
6 SW1 7 8 9
1200bps
PGM (C6) GND(C7)
100k
+4.4V out (C5) GND (C6) RX2M PGM (C7)
uC UART
NPN
PC serial port
6
2400bps
1 2 3 4 5
RXD TXD
7 8
TXD
MOD TXD 100k (C8)
MOD RXD (C9)
C UART
1200bps
VDD
MAX232
9 SGD
4.5 - 15V 4.5 - 15V
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 7
Condensed specifications
Frequency Frequency stability Channel spacing Number of channels Supply voltage Current 458.5-459.1MHz or 433-434MHz (any 5MHz band from 420-480MHz) +/- 1.5kHz 25kHz (12.5kHz by special order) 128 channels controlled via RS232 interface (8 parallel selected) 4.5-16V 100mA nominal transmit 13mA receive -10 to +60 C (Storage -30 to +70 C) 59 x 38 x 7 mm Compliant with ETSI EN 300 220-3 and EN 301 489-3 8pin 0.1" pitch molex 2pin 0.1" pitch molex 3pin 0.1" pitch molex 1.2mm (min.) ETSI Radio standard EN 300 220-3 and EMC standard EN 301 489-3
Operating temperature Size Spurious radiations Interface user Power RF Recommended PCB hole size Intended approval Transmitter Output power TX on switching time Modulation type TX modulation bandwidth Adjacent channel TX power Inputs Receiver Sensitivity image / spurious Blocking adjacent channel Outputs Power on to valid audio Power on to valid audio Power on to stable data out
+20dBm(100mW) 1dB (factory adjustable 1 - 100mW) 50 ms FM, FSK (F1D, F3D) DC - 3kHz -37dBm analogue, data (CMOS/TTL compatible)
-112dBm for 1 part per 1000 BER -118dBm for 12 dB SINAD -70dB -85dB <-60dB (Tested per. ETSI EN 301 489-3 RSSI, carrier detect, audio, data 28ms (no noise mute) 45ms (with noise mute) 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) 100 50 25 10 5 1 Current (mA) 90 67 54 41 35 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 8
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 timing requirements, while the presence of sync codes in the transmitted bursts prevents the receiver from outputting garbage in the presence of noise. No error correction or retransmission of lost packets is supported. 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 microcontroller 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 byte software FIFO. At the transmit end this is used to allow for the TX2M transmitter start up time (about 32mS), while on receive it buffers arriving packets to the constant output data rate. All timing and data formatting 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 replaces 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 operation in the transmit software, and decoding in the receiver, isolate the AC coupled, potentially noisy baseband radio environment from the datastream. The radio link is fed a continuous tone by the modem. As in biphase codes, information is coded by varying the duration consecutive half-cycles of this tone. In our case half cycles of 500s (a long, or L) and 250s (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) part : LSSSSSSSSSSSSL followed by the Data part, made up of twelve Groups (of four half cycles duration). 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 by the receiver software as a noise artifact. Idle state tone (LLLL ....) is decoded as null data, but does not 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: 2. Inherent error detection: Unlike biphase, where a bit is coded as either a long half cycle or a short cycle, here all half cycles are detected separately. 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). 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
3. Comparable spectral efficiency:
Radiometrix Ltd
TX2M/RX2M Data Sheet
page 9
Transmitter variant
RX2M is designed to be pin and polarity compatible with existing industry standard modules. AF and Data Output are inverted relative to original transmitted signal. The transmitter is available in two variants - TX2I and TX2M The non-inverting transmitter called TX2M frequency modulates the carrier frequency in the normal sense whereby higher modulating voltage increases the carrier frequency and lower modulating voltage decreases the carrier frequency which results in an inverted AF and Data output on the receiver. This will be the standard module and exact plug-in replacement for existing industry standard modules.
No modulation
AF
Vcc
Data slicer
0V
3V
RXD
TX2M
433.047MHz 433.05MHz 433.053MHz
RX2M
Figure 7: Data polarity change from TX2M (non-inverting) transmitter to RX2M receiver The inverting transmitter called TX2I reverses the Frequency Modulating order whereby the higher modulating voltage decreases the carrier frequency and lower modulating voltage increases carrier frequency which results in non-inverting AF and Data output on the receiver. This variant can be used for applications where data inversion will be problematic.
No modulation
AF
Vcc
Data slicer
3V
0V
RXD
TX2I
433.047MHz 433.053MHz 433.05MHz
RX2M
Figure 8: Data polarity change from TX2I (inverting) transmitter to RX2M receiver
Ordering information
Part Number TX2M-433-5 TX2I-433-5 RX2M-433-5 TX2M-458-5 TX2I-458-5 RX2M-458-5 TX2M-458-10 TX2I-458-10 RX2M-458-10
Radiometrix Ltd
Description TX2M (non-inverting) transmitter TX2I (inverting) transmitter RX2M receiver TX2M (non-inverting) transmitter TX2I (inverting) transmitter RX2M receiver TX2M (non-inverting) transmitter TX2I (inverting) transmitter RX2M receiver
Frequency band 433.05MHz-434.790MHz 433.05MHz-434.790MHz 433.05MHz-434.790MHz 458.525MHz-459.100MHz 458.525MHz-459.100MHz 458.525MHz-459.100MHz 458.525MHz-459.100MHz 458.525MHz-459.100MHz 458.525MHz-459.100MHz
TX2M/RX2M Data Sheet
Maximum data rate 5kbps 5kbps 5kbps 5kbps 5kbps 5kbps 10kbps 10kbps 10kbps
page 10
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 wholeor 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/ 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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