EW
N
Issue 3, 19 October2007
Radiometrix
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
TX1M/RX1M
VHF Narrow Band FM multi channel radio Transmitter & Receiver
Band
UK Version: RX1M-173-5/TX1M-173-5 (10mW)
The TX1M transmitter and RX1M receiver
modules offer a low power, reliable data link in
an industry-standard pin out and footprint.
This makes the TX1M/RX1M pair ideally suited
to those low power applications where existing
wideband modules have insufficient range, or
where multi-channel operation is needed in
VHF frequency.
Features
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TX1M-151-5
RX1M-151-5
Conforms to EN 300 220-3 and EN 301 489-3
Any custom band in 60 - 65MHz with 1MHz or 135 - 175MHz with 3MHz (AR0)
frequency range
Data rates up to 5 kbps for standard module
Usable range over 1km (@100mW)
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: 60-65MHz or 135 – 175MHz
128 serial select or 8 parallel select channels
Transmit power: +20dBm (100mW) nominal
Supply range: 4.5V - 15V
Current consumption: 110mA transmit, 13mA receive
Data bit rate: 5kbps max. (standard module)
Receiver sensitivity: -118dBm
(
for 12 dB SINAD)
Receiver blocking -85dB
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Radiometrix Ltd
TX1M/RX1M Data Sheet
page 1
Radiometrix Ltd
TX1M/RX1M Data Sheet
Figure 1: TX1M block diagram
page 2
Radiometrix Ltd
TX1M/RX1M Data Sheet
Figure 2: RX1M block diagram
page 3
Pin Description – TX1M
Pin: A
1
2
Pin: B
1
2
3
Name
Vcc
Gnd
Name
Gnd
RF out
Gnd
Function
4.5 – 15V
Ground
Function
RF ground
To the antenna
RF ground
Figure 3: TX1M 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 (>2kHz for 60-65MHz)
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 – RX1M
Pin A
1
2
Pin B
1
2
3
Name
Vcc
Gnd
Name
Gnd
RF out
Gnd
Function
4.5-15V
Ground
Function
RF ground
To the antenna
RF ground
Figure 4: RX1M 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 RX1M mutes the AF and RXD 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
TX1M/RX1M Data Sheet
page 4
TX1M and RX1M 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
<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
=
173.250
MHz
=
6930
25
kHz
R
=
f
TCXO
f
channelspacing
=
13
MHz
, So R=520
25
kHz
N
RX
=
f
RF
−
21.4
MHz
171.250
MHz
−
21.4
=
=
6140
f
Channelspacing
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.
Radiometrix Ltd
TX1M/RX1M Data Sheet
page 5
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