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
Multi-
Narrow 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
P
in 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 10kΩ 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 1V
pk-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
200mV
pk-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 10kΩ 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
<cr>
/
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
10
Mhz
25
kHz
R
R
=
f
TCXO
f
channelspacing
=
10
MHz
, So R=400
25
kHz
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
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