TR3M

TR3M RADIOMETRIX | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 10

Technical content

Features

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

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 Narrow Band FM MultiNarrow Band FM MultiNarrow Band FM MultiNarrow Band FM Multi----channel UHF Transceichannel UHF Transceichannel UHF Transceichannel UHF Transceiverververver 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 powe r applications where existing wideband modules have insufficient range, or where multi-channel operation is needed. Radiometrix Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England Issue 1, 08 June 2008 TR3M Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233 Figure 1: TR3M-868-5 transceiver

Radiometrix Ltd, TR3M Data Sheet page 2 Figure 2: TR3M block diagram

Radiometrix Ltd, TR3M Data Sheet page 3 59mm 3.1mm 8.9 mm A CB 38.5mm 2.7mm 33mm 53.3mm Unit height 10mm A: 1 Vcc A: 2 Gnd B: 1 RF Gnd B: 2 RF in B: 3 RF Gnd C: 1 C: 2 TXD (MOD NC) C: 3 AF in (MOD NC) C: 4 RSSI C: 5 SQF (MOD NC) C: 6 AF out C: 7 RXD (MOD NC) C: 8 +4.4V out C: 9 0V C: 10 PGM C: 11 P1 (MOD TXD) C: 12 P2 (MOD RXD) C: 13 P3 (MOD NC) TXE (MOD TX_ON) Squelch adj. Input gain. Pin Description - TR3M Pins Name Function A1 Vcc 4.5V-16V A2 GND Ground B1 RF GND RF ground B2 RF To the antenna B3 RF GND RF ground C1 TXE (MOD TX_ON) Transmitter Enable. Low = ON, Open = RX mode. Internal 10kΩ pull-up to 4V C2 TXD (MOD NC) DC coupled digital data input for 3-12V CMOS logic. Leave open if unused C3 AF in (MOD NC) AC coupled Analogue Input Limit to 1Vpk-pk ±10% to keep distortion <1.5% and peak deviation >2.5kHz C4 RSSI DC level between 0.5V and 2.5V. 60dB dynamic range C5 SQF (MOD NC) Noise operated carrier detect. Open collector. ON/low = no signal C6 AF out 200mV pk-pk audio. DC coupled, approx 1V bias. Muted by squelch C7 RXD (MOD NC) Open collector output of data slicer suitable for Biphase codes C8 +4.4V out Regulated DC supply. 75mA max. drain. Present if unit is powered C9 0V Ground C10 PGM Serial programming/configuration input at true RS232 level C11 P1 (MOD TXD) C12 P2 (MOD RXD) C13 P3 (MOD NC) 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. Figure 3: TR3M Footprint (Top)

Radiometrix Ltd, TR3M Data Sheet page 4 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. 1k Ω) 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). TXE (MOD TX_ON) (C1) TXD (MOD NC) (C2) AF in (MOD NC) (C3) RSSI (C4) SQF (MOD NC) (C5) 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 10kΩ 100nF Carrier Detect Host Microcontroller TR3M-868-5

3 TXD

Radiometrix Ltd, TR3M Data Sheet page 5 Received Signal Strength 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 RF Level (dBm) RSSI output (V) 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 6 TR3M serial configuration commands 2400 baud RS232. 8 bit data, no parity, 1 start bit, 1 or 2 stop bits, No flow control 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) LOAD aa 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 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 34720kHz25 MHz868 f fN cingChannelspa RF TX === kHz MHz f fR cingchannelspa TCXO 13== , So R=520 RX kHz25 MHz45 f IFOFFSET cingchannelspa == = 1800 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 7 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 Name Function 1 MOD TX_ON Open = normal modem operation. Low = constant TX (for test). 10k pullup to 4V

2 MOD NC Leave open

3 MOD NC Leave open

4 RSSI DC level between 0.5V and 2.5V. 60dB dynamic range

5 MOD NC Leave open

6 AF out Modem tones or noise present

7 NC Leave open

8 +4.4V out Regulated DC supply. 75mA max. drain. Present if unit is powered 9 0V Ground

10 PGM Serial programming/configuration input at RS232 level

11 MOD TXD RS232 data input (true). 10k pullup to 4V

12 MOD RXD Inverted RS232 data out (to inverting buffer like MAX232)

13 MOD NC 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) RSSI (C4) SQF (MOD NC) (C5) 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) TR3M-868-5 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 8 Condensed specifications Frequency 868 – 870MHz (any 3MHz band from 860 - 870MHz) Frequency stability +/- 1.5kHz Channel spacing 25kHz Number of channels 128 channels controlled via RS232 interface (8 parallel selected) Supply voltage 4.5-16V Current 85mA nominal transmit 30mA receive Operating temperature -20 to +55 οC (Storage -30 to +70 οC) Size 59 x 38 x 10 mm Spurious radiations Compliant with ETSI EN 300 220-3 and EN 301 489-3 Interface user 13pin 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 +14dBm (25mW) ±1dB (factory adjustable 5-25mW) TX on switching time 50 ms Modulation type FM, FSK (F1D, F3D) TX modulation bandwidth DC – 3kHz Adjacent channel TX power <-37dBm (<200nW) TX spurii better than -40dBm Inputs analogue, data (CMOS/TTL compatible) Receiver Sensitivity -118dBm for 12 dB SINAD adjacent channel -63dB image / spurious -70dB blocking -80dB Spurious radiations Compliant with ETSI 300-220-3 and 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 (50:50 mark / space) 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 9 Appendix [mW] [MHz] RF POWER [ERP] 100 500 600kHz 500kHz 250kHz 300kHz 25mW 25mW CEPT/ERC Rec 70-03, 868 MHz Band Plan 868.0 868.60 868.70 869.20 869.25 869.30 869.65 869.40 870.0 869.70 <1% or LBT No Spacing Non-specific SRD Non-specific SRD Non-specific SRD No Spacing up to 100%<0.1% or LBT <1% <10% or LBT <10% No Spacing 25kHz or Wide Band 25kHz AlarmAlarm <1% 25kHz or WB Alarm Social Alarm 10mW 25kHz <0.1% 100kHz 25mW 10mW 50kHz 50kHz 10mW Non-specific SRD 25kHz 50kHz

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/ 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