Radiometrix Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England Issue 1, 08 June 2008 Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233 TR3M Narrow Band FM MultiTransceiver ver Multi-channel UHF Transcei The TR3M is a 25kHz channel narrowband transceiver, operating on the European 868MHz band Non-Specific SRD allocation. The module offers a low power, reliable data link in an industry-standard pin out and footprint. This makes the TR3M ideally suited to those low power applications where existing wideband modules have insufficient range, or where multi-channel operation is needed. Features Figure 1: TR3M-868-5 transceiver Conforms to EN 300 220-3 and EN 301 489-3 High performance double superhet, 128 channel PLL Synthesizer with TCXO Data rates up to 5 kbps for standard module Usable range over 500m (with 25mW variant) Fully screened Feature-rich interface (RSSI, automatic noise squelch, analogue and digital baseband) Incorporates a 1200baud dumb modem User configurable via RS232 interface Low power requirements Applications Handheld terminals Heavy vehicle/machine remote controls 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 Operating frequency: 868 - 870MHz Custom variants on any 3MHz block from 860 - 870MHz Up to 80 channels in 868MHz band (128 channels max.) Transmit power: +14dBm (25mW) nominal Supply range: 4.5V - 16V Current consumption: 85mA transmit @ 25mW, 30mA receive Data bit rate: 5kbps max. (standard module) Receiver sensitivity: -118dBm (for 12 dB SINAD) Size: 59 x 38 x 10mm Radiometrix Ltd, TR3M Data Sheet page 1 Figure 2: TR3M block diagram Radiometrix Ltd, TR3M Data Sheet page 2 59mm 2.7mm 3.1mm A 1 8.9 mm Squelch adj. 33mm 1 Vcc 2 Gnd 1 RF Gnd 2 RF in 3 RF Gnd 1 TXE (MOD TX_ON) 2 TXD (MOD NC) 3 AF in (MOD NC) 4 RSSI 5 SQF (MOD NC) 6 AF out 7 RXD (MOD NC) 8 +4.4V out 9 0V 10 PGM 11 P1 (MOD TXD) 12 P2 (MOD RXD) 13 P3 (MOD NC) 38.5mm A: A: B: B: B: C: C: C: C: C: C: C: C: C: C: C: C: C: Input gain. B 1 C 53.3mm Unit height 10mm Figure 3: TR3M Footprint (Top) Pin Description - TR3M Pins A1 A2 Name Vcc GND Function 4.5V-16V Ground B1 B2 B3 RF GND RF RF GND RF ground To the antenna RF ground C1 C2 C3 TXE (MOD TX_ON) TXD (MOD NC) AF in (MOD NC) C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 RSSI SQF (MOD NC) AF out RXD (MOD NC) +4.4V out 0V PGM P1 (MOD TXD) P2 (MOD RXD) P3 (MOD NC) Transmitter Enable. Low = ON, Open = RX mode. Internal 10kΩ pull-up to 4V DC coupled digital data 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 deviation >2.5kHz DC level between 0.5V and 2.5V. 60dB dynamic range Noise operated carrier detect. Open collector. ON/low = no signal 200mVpk-pk audio. DC coupled, approx 1V bias. Muted by squelch Open collector output of data slicer suitable for Biphase codes Regulated DC supply. 75mA max. drain. Present if unit is powered Ground Serial programming/configuration input at true RS232 level Parallel frequency select inputs. Inverted logic, internal 10kΩ pullups to 4V Notes: 1. TR3C receiver section inverts sense of the baseband stream, so a logical inversion is present between input of TX and output on RX 2. Carrier detect on TR3M mutes the AF Out and RXD outputs. It can be factory disabled. 3. All the open collector outputs must be connected to Vcc/+4.4V out via a pull-up resistor. 4. With 1200baud modem mode enabled, parallel selection of channel is unavailable as the P1-P3 lines are used for modem input/output operations. 5. PGM and MOD TXD (pin 10 and 11) tolerate true ±RS232 levels. No buffering is required. Radiometrix Ltd, TR3M Data Sheet page 3 TXE (MOD TX_ON) (C1) AF in (MOD NC) (C3) ADC AF out (C6) RXD (MOD NC) (C7) +4.4V out (C8) GND (C9) PGM (C10) P1 (MOD TXD) (C11) P2 (MOD RXD) (C12) P3 (MOD NC) (13) 1kΩ TR3M-868-5 RSSI (C4) SQF (MOD NC) (C5) Carrier Detect Data In 10kΩ 100nF VDD Parallel Channel Select 6 7 8 9 1 2 3 TXD 4 5 SGD PC serial port Data Out Host Microcontroller Transmit Enable TXD (MOD NC) (C2) Figure 4: TR3M interfaced to host microcontroller and serial port for configuration TR3M can be directly interfaced to a host microcontroller which can generally be powered by the regulated +4.4V output on pin 8 of TR3M. Three I/O pins on the microcontroller port can be assigned to select the first 8 channels on frequency table of the appropriate band for which the module is configured by pulling the P1-P3 pins low. Channel select pins of TR3M have internal pull-up to 4V supply rail, hence channel selection operate on inverted logic. Digital Received Data Output (RXD) pin is an open collector output, which should be pulled-up to required voltage swing level (e.g. +4.4V or Vcc). TR3M has an automatic noise squelching function which is activated when there is not any RF signal at detectable level on the channel or if the non-coherent noise like interference level is high enough to block any weak RF signal from being received. SQF is provided as an open-collector output for monitoring which should be pulled-up to required voltage swing level. SQF output will jump to pull-up voltage level if received RF signal level at the RF In/Out pin of the module is about 3dB below the level required to produce 12dB SINAD level on demodulated AF Output signal. SQF pin can be connected to an LED to act as a Carrier Detect indicator. Pull-up resistor value should be reduced (e.g. 1kΩ) according to the current requirement to produce satisfactory brightness on the LED used. TR3M can be configured using any PC/Laptop/PDA having a serial port and modem/terminal program. TXD (pin 3) of DB9M connector can be directly wired to PGM (pin C10) of the TR3M and SGN (pin 5) of DB9M connector should be either connected to common ground or pin C9 of the TR3M. The whole frequency/channel table is user reconfigurable to 128 channels within 3MHz band of supplied frequency subject to regulatory band limits. Serial Channel Selection via PGM pin gives access to the whole of regulatory band allocation for 868 - 870MHz (see appendix). Radiometrix Ltd, TR3M Data Sheet page 4 Received Signal Strength 2.5 2.3 2.1 RSSI output (V) 1.9 1.7 1.5 1.3 1.1 0.9 0.7 0.5 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 RF Level (dBm) Figure 5: RSSI voltage variation with respect to RF level at TR3M If the microcontroller has a built-in Analogue to Digital Converter (ADC), the Received Signal Strength Indicator (RSSI) output voltage level can be read by the microcontroller to estimate its distance from transmitting TR3M unit or identify areas of weak signal reception. RSSI can also be used to make a decision to switch to the second antenna in fixed installations within building where the probability of null-spots are higher. Radiometrix Ltd, TR3M Data Sheet page 5 TR3M serial configuration commands 2400 baud RS232. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits, No flow control SINGLE GOCHAN LOADMX LOAD aa LOADTB RVALUE SETPAR SETSER SETMOD Set value of N for single channel operation Serial select of channel xx (0 to 127) Set highest permitted (serial selected) channel xx (others default to ch0) Set value of N for channel aa (channels 0 to 15) Set value of N for channel 16 (channels 17 to 127 then in sequence) Enter value for R register Channel selected by 3 bit parallel input (0 to 7). Disable modem Channel selected by most recent 'gochan' operation Enable internal modem. Frequency selected by most recent 'gochan' or 'single' GOTEST 250Hz test tone transmission OFFSET ooo Set receive frequency offset (for 25KHz channel this is 1800) <cr> Process entry / 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) 000 = frequency offset N TX = RX nnnnn xx xx nnnnn nnnnn rrrr f RF f Channelspacing OFFSET = = 868 MHz = 34720 25 kHz IF f channelspacing = R= fTCXO f channelspacing = 13MHz , So R=520 25kHz 45 MHz = 1800 25kHz 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. User can modify the frequency table of 128 channels to any desired frequency by changing N, R values of synthesizer within ±2.5MHz of factory set Channel 0 frequency subject to the Radio Regulatory Band Allocation in the country of intended use. 4. All other frequency, power, analogue input gain and automatic noise squelching adjustment will be treated as custom variants of the module to be set by factory. Radiometrix Ltd, TR3M Data Sheet page 6 Pin description of TR3M with Modem mode selected The 'modem' mentioned is a 1200 baud RS232 semi-intelligent unit (Transmit keyed when valid serial data is present, so no separate TX control needed. Coding in the datastream also permits the receiver to ignore noise and only output valid serial data). This is a half duplex unit, so collisions between transmitted and received packets must be dealt with by the user. Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 Name MOD TX_ON MOD NC MOD NC RSSI MOD NC AF out NC +4.4V out 0V PGM MOD TXD MOD RXD MOD NC Function Open = normal modem operation. Low = constant TX (for test). 10k pullup to 4V Leave open Leave open DC level between 0.5V and 2.5V. 60dB dynamic range Leave open Modem tones or noise present Leave open Regulated DC supply. 75mA max. drain. Present if unit is powered Ground Serial programming/configuration input at RS232 level RS232 data input (true). 10k pullup to 4V Inverted RS232 data out (to inverting buffer like MAX232) Leave open TR3Ms on both ends 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. TXE (MOD TX_ON) (C1) TXD (MOD NC) (C2) AF in (MOD NC) (C3) TR3M-868-5 RSSI (C4) SQF (MOD NC) (C5) AF out (C6) Serial COM Port RXD (MOD NC) (C7) +4.4V out (C8) GND (C9) PGM (C10) P1 (MOD TXD) (C11) P2 (MOD RXD) (C12) SW1 VDD 6 1 2 7 3 8 9 P3 (MOD NC) (13) RXD TXD 4 5 SGD RS232 driver Figure 6: TR3M 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 TXD (Pin 3) of a Serial Port can be switched from PGM (Pin C10) to MOD TXD (Pin C11) with no RS232 driver in between. However, MOD RXD (Pin C12) 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 C8). Radiometrix Ltd, TR3M Data Sheet page 7 Condensed specifications Frequency Frequency stability Channel spacing Number of channels 868 – 870MHz (any 3MHz band from 860 - 870MHz) +/- 1.5kHz 25kHz 128 channels controlled via RS232 interface (8 parallel selected) Supply 4.5-16V 85mA nominal transmit 30mA receive voltage Current Operating temperature Size Spurious radiations Interface user Power RF Recommended PCB hole size -20 to +55 οC (Storage -30 to +70 οC) 59 x 38 x 10 mm Compliant with ETSI EN 300 220-3 and EN 301 489-3 Intended approval ETSI Radio standard EN 300 220-3 and EMC standard EN 301 489-3 13pin 0.1" pitch molex 2pin 0.1" pitch molex 3pin 0.1" pitch molex 1.2mm (min.) Transmitter Output power TX on switching time Modulation type TX modulation bandwidth Adjacent channel TX power TX spurii Inputs +14dBm (25mW) ±1dB (factory adjustable 5-25mW) 50 ms FM, FSK (F1D, F3D) DC – 3kHz <-37dBm (<200nW) better than -40dBm analogue, data (CMOS/TTL compatible) Receiver Sensitivity adjacent channel image / spurious blocking Spurious radiations Outputs Power on to valid audio Power on to valid audio Power on to stable data out (50:50 mark / space) -118dBm for 12 dB SINAD -63dB -70dB -80dB Compliant with ETSI 300-220-3 and EN 301 489-3 RSSI, carrier detect, audio, data 28ms (no noise mute) 45ms (with noise mute) 50ms (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 Radiometrix Ltd, TR3M Data Sheet page 8 Radiometrix Ltd, TR3M Data Sheet 10 100 500 868.0 [mW] 600kHz 25mW <1% or LBT Duty Cycle 868.60 100kHz 868.70 10mW <1% 25kHz or WB No Spacing Channel Spacing Applications Alarm RF POWER [ERP] Non-specific SRD 500kHz <1% 25kHz 869.25 250kHz 500mW 869.65 869.70 50kHz 25mW <10% or LBT <10% 869.30 869.40 50kHz 50kHz 100kHz 869.20 No Spacing 25kHz 25kHz or Wide Band 300kHz 5mW 870.0 up to 100% Non-specific SRD Alarm Non-specific SRD 10mW 10mW 10mW <0.1% <0.1% or LBT 25mW 25kHz Social Alarm Alarm No Spacing Non-specific SRD CEPT/ERC Rec 70-03, 868 MHz Band Plan [MHz] Appendix page 9 Radiometrix Ltd Hartcran House 231 Kenton Lane Harrow, Middlesex HA3 8RP ENGLAND Tel: +44 (0) 20 8909 9595 Fax: +44 (0) 20 8909 2233 [email protected] 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/ 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 [email protected] European Radiocommunications Office (ERO) Peblingehus Nansensgade 19 DK 1366 Copenhagen Tel. +45 33896300 Fax +45 33896330 [email protected] www.ero.dk