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EW N
Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
Issue A, 25 February 2008
TR1M
MultiNarrow Band FM Multi-channel VHF Transceiver
The TR1M narrow band multi channel transceiver module is intended as a general purpose VHF data communication unit. It is available on any frequency between 135 and 175MHz (in 3MHz bands) and delivers up to 100mW RF output. This transceiver offers a low power, reliable data link in an industry standard footprint. For added flexibility it shares a common pinout with the UHF TR2M module.
Features
Figure 1: TR1M-151-5 VHF transceiver
Conforms to EN 300 220-3 and EN 301 489-3 Any 3MHz band module from 135MHz to 175MHz available as factory tuned custom variant High performance double superhet, 128 channel PLL Synthesizer with TCXO Data rates up to 5 kbps for standard module Usable range over 1km (with 100mW 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
Size: 59 x 38 x 12mm Custom variants from 135MHz to 175MHz on any 3MHz band (Available on the UK 173.2MHz 173.325MHz 10mW band) 128 serial select or 8 parallel select channels Transmit power: +20dBm (100mW) nominal Supply range: 4.5V - 16V Current consumption: 110mA transmit (@100mW), 27mA receive Data bit rate: 5kbps max. (standard module) Receiver sensitivity: -118dBm (for 12 dB SINAD)
Radiometrix Ltd
TR1M Data Sheet
page 1
Radiometrix Ltd
TR1M Data Sheet
page 2
Figure 2: TR1M block diagram
A: A: B: B: B: C: C: C: C: C: C: C: C: C: C: C: C: C:
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)
59mm 3.1mm 2.7mm A 8.9 mm Squelch adj. 38.5mm 33mm 1
Input gain.
B
1 53.3mm
C
Unit height 12mm
Figure 3: TR1M Footprint (Top) view
Pin Description - TR1M
Pins A1 A2 B1 B2 B3 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 Name Vcc GND RF GND RF RF GND TXE (MOD TX_ON) TXD (MOD NC) AF in (MOD NC) RSSI SQF (MOD NC) AF out RXD (MOD NC) +4.4V out 0V PGM P1 (MOD TXD) P2 (MOD RXD) P3 (MOD NC) Function 4.5V-16V Ground RF ground To the antenna RF ground Transmitter Enable. Low = ON, Open = RX mode. Internal 10k pull-up to 4V DC coupled digital data input for 3-12V CMOS logic. Leave open if unused 50mV - 2.5v p-p AC coupled input. Variable gain. Factory set 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 RS232 level Parallel frequency select inputs. Inverted logic, internal 10k pullups to 4V
Notes: 1. TR1M receiver section inverts the sense of the baseband stream, so a logical inversion is present between input of TX and output of RX. 2. Carrier detect on TR1M 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. The software incorporates a 1200baud dumb modem, compatible with that implemented in SMX1, UHX1, NBEK, TX1M, RX1M radios (I1200 tones and format) 5. With 1200baud modem mode enabled, parallel selection of channel is unavailable as the P1-P3 lines are used for modem input/output operations. 6. PGM and MOD TXD (pin 10 and 11) tolerate true RS232 levels. No buffering is required. 7. For UK version the following channel assignment is supplied: Channel 0 1 2 3 4-7 8 - 127 Frequency (MHz) 173.250 173.275 173.300 173.325 173.225 (only used for alarm applications) 173.325
Radiometrix Ltd
TR1M Data Sheet
page 3
TR1M 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 nnnnn xx xx nnnnn nnnnn rrrr 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' Set receive frequency offset (for 25KHz this is 856) Process entry Clear all buffers
OFFSET ooo /
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=
f RF 173.200 MHz = = 6928 25kHz 10 Mhz R
R=
f TCXO f channelspacing
=
10 MHz , So R=400 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. In 173MHz band, channel 4- 7 (173.225MHz) is allocated specifically for fixed alarm and should not be used for general purpose applications. 4. User can modify the frequency table of 128 channels to any desired frequency by changing N, R values of synthesizer within 1.5MHz of factory set Channel 0 frequency subject to the Radio Regulatory Band Allocation in the country of intended use. 5. 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
TR1M Data Sheet
page 4
Pin description of TR1M 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. Pins 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 CDE
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) Pull low to enable carrier detect on receive operation (not recommended)
TR1Ms 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)
TR1M
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) SW1 VDD Serial COM Port 6 7 8 9 1 2 3 4 5 SGD
RXD TXD
RS232 driver
Figure 4: TR1M 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
TR1M Data Sheet
page 5
Condensed specifications
Frequency Frequency stability Channel spacing Number of channels Any 3MHz band from 135 - 175MHz +/- 1.5kHz 25kHz (12.5kHz by special order) 128 channels controlled via RS232 interface (8 parallel selected) 4.5-16V Transmit: 110mA nominal @ 100mW (55mA nominal @ 10mW) Receive: 27mA -10 to +60 C (Storage -30 to +70 C) 59 x 38 x 12 mm Compliant with ETSI EN 300 220-3 and EN 301 489-3 13pin 0.1" pitch molex 2pin 0.1" pitch molex 3pin 0.1" pitch molex
1.2mm (min.)
Supply
voltage
Current
Operating temperature Size Spurious radiations Interface user Power RF
Recommended PCB hole size
Intended approval
ETSI Radio standard EN 300 220-3 and EMC standard EN 301 489-3 +20dBm (100mW) 1dB (factory adjustable 1-100mW) 50 ms FM, FSK (F1D, F3D) DC - 3kHz -37dBm analogue, data (CMOS/TTL compatible)
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 (no noise mute) Power on to valid audio (with noise mute) Power on to stable data out (50:50 mark / space) -118dBm for 12dB SINAD -70dB -85dB <-65dB (Tested per. ETSI EN 301 489-3 RSSI, carrier detect, audio, data 28ms 45ms 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
TR1M Data Sheet
page 6
Application information
TXE (MOD TX_ON) (C1) TXD (MOD NC) (C2) AF in (MOD NC) (C3) RSSI (C4) SQF (MOD NC) (C5) 1k 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) Carrier Detect
Transmit Enable
ADC
Host Microcontroller
Data Out
TR1M
6 7 8 9
Data In 10k 100nF VDD Parallel Channel Select
2 3 4 5
TXD
SGD
Figure 5: TR1M interfaced to host microcontroller and serial port for configuration TR1M can be directly interfaced to a host microcontroller which can generally be powered by the regulated +4.4V output on pin 8 of TR1M. 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 TR1M 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). TR1M 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) according to the current requirement to produce satisfactory brightness on the LED used. TR1M 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 TR1M and SGN (pin 5) of DB9M connector should be either connected to common ground or pin C9 of the TR1M. The whole frequency/channel table is user reconfigurable to 128 channels within 3MHz band of supplied frequency subject to regulatory band limits.
Radiometrix Ltd
TR1M Data Sheet
PC serial port
1
page 7
Received Signal Strength 2.5 2.3 2.1 1.9 RSSI output (V) 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 6: Typical RSSI voltage variation with respect to RF level at TR1M 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 TR1M 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
TR1M Data Sheet
page 8
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 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

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