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 458.5-
459.1MHz UK band (at 100mW) and the
European 433.05-434.79MHz band.
RX2M-458-5
TX2I-458-5
Features
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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
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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
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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
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)
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 1V
pk-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 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
200mV
pk-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 1V
pk-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
<CR>
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
25
kHz
R
=
f
TCXO
f
channelspacing
=
13
MHz
, So R=520
25
kHz
N
RX
=
f
RF
−
21.4
MHz
433.050
MHz
−
21.4
=
=
16466
f
Channelspacing
25
kHz
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
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