Data Sheet(pdf)

Hartcran House, 231 Kenton Lane, Harrow, Middlesex, HA3 8RP, England
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233, www.radiometrix.com
TX1M/RX1M
Issue 3, 02 August 2012
VHF Narrow Band FM multi channel TX and RX
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
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
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
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
Evaluation platforms: NBEK + XX2M carrier
Radiometrix Ltd
TX1M/RX1M Data Sheet
page 1
Figure 1: TX1M block diagram
Radiometrix Ltd
TX1M/RX1M Data Sheet
page 2
Figure 2: RX1M block diagram
Radiometrix Ltd
TX1M/RX1M Data Sheet
page 3
Pin Description – TX1M
Figure 3: TX1M Footprint (Top) view
Pin
1A
2A
Name
Vcc
Gnd
Function
4.5 – 15V
Ground
1B
2B
3B
Gnd
RF out
Gnd
RF ground
To the antenna
RF ground
1C
2C
3C
4C
0V
TXE
TXD
AF in
5C
6C
7C
8C
9C
10C
+4.4Vout
PGM
0V
P1 (MOD TXD)
P2 (MOD NC)
P3 (MOD TXH)
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 1Vpk-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
Notes:
1. Internal AF Input gain is factory set for 1Vpk-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. 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
3. Pin Description – RX1M
Figure 4: RX1M Footprint (Top) view
Pin
1A
2A
Name
Vcc
Gnd
Function
4.5-15V
Ground
1B
2B
3B
Gnd
RF out
Gnd
RF ground
To the antenna
RF ground
1C
2C
3C
4C
5C
6C
7C
8C
9C
10C
RSSI
SQF
AF out
RXD
+4.4V out
0V
PGM
P1 (MOD NC)
P2 (MOD RXD)
P3 (MOD CDE)
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. Need external pull-up
DC supply. 75mA maximum drain. Present if unit is powered.
Ground
Serial programming/configuration input at RS232 level
Parallel frequency select inputs. Inverted logic, 10K pullups to 4V
Notes:
1. Carrier detect on RX1M mutes the AF and RXD outputs when RF input signal is <-123dBm. This can
be factory disabled if required.
2. There are no pullups on the open collector outputs. External pull-up resistor should be used.
3. 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 5
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 Format Description
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 =
N RX =
f RF
f Channelspacing
=
173.250 MHz
= 6930
25kHz
R=
fTCXO
f channelspacing
=
13MHz
, So R=520
25kHz
f RF − 21.4MHz 171.250MHz − 21.4
=
= 6140
f Channelspacing
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.
Radiometrix Ltd
TX1M/RX1M Data Sheet
page 6
Pin description of TX1M/RX1M with Modem mode selected
The 'modem' mentioned is a 1200 baud RS232 semi-intelligent unit (Transmitter is enabled when valid serial
data is present, so no separate Transmit Enable control is needed. Coding in the data stream also permits
the receiver to ignore noise and only output valid serial data.
Pin Description – TX1M
Pin
Name
1
0V
2
TXE
3
N/C
4
N/C
5
+4.4Vout
6
PGM
7
0V
8
MOD TXD (P1)
9
MOD N/C (P2)
10
MOD TXH (P3)
Pin Description – RX1M
Pin
Name
1
RSSI
2
3
4
5
6
7
8
9
10
N/C
N/C
N/C
+4.4V out
0V
PGM
MOD N/C (P1)
MOD RXD (P2)
MOD CDE (P3)
Function
Ground
Must be tied to 0V
DC supply. 75mA maximum drain. Only present when TXE is low
Serial programming/configuration input at RS232 level
Ground
Serial data input at RS232 level
Active Low Transmit Hold for continuous transmission (useful for test)
Function
DC level between 0.5V and 2.5V. 60dB dynamic range
(only valid during databursts)
(modem tones or noise present)
(modem tones or noise present)
DC supply. 75mA maximum drain. Present if unit is powered
Ground
Serial programming/configuration input at RS232 level
Modem Received Data at TTL level (requires RS232 driver)
Pull low to enable Carrier Detect on modem operation (not recommended)
Both the TX1M and the RX1M 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.
Antenna
Antenna
0V (C1)
TXE (C2)
TX1M
PC serial port
1
TXD
2
3
4
+4.4V out (C5)
GND (C6)
RX1M PGM (C7)
4.4V 0ut (C5)
2400bps
6 SW1
PGM (C6)
GND(C7)
7
5
PC serial port
2400bps
100kΩ
MOD TXD
100kΩ
(C8)
8
9
SGD
NC (C2)
1200bps
MOD RXD (C9)
uC
UART
µC
UART
NPN
6
1
2
7
3
8
1200bps
VDD
MAX232
RXD
TXD
4
9
5
SGD
4.5 - 15V 4.5 - 15V
Figure 5: TX1M and RX1M 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
For TX1M, TXD (Pin 3) of a Serial Port can be switched from PGM (Pin C6) to MOD TXD (Pin C8) with no
RS232 driver in between. However, in RX1M, MOD RXD (Pin C9) 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 C5).
Radiometrix Ltd
TX1M/RX1M Data Sheet
page 7
Condensed specifications
Frequency
TX1M/RX1M: any 1MHz from 60 - 65MHz
TX1M: any 3MHz band from 135-175MHz
RX1M: any 2MHz band from 130-180MHz
Frequency stability
Channel spacing
Number of channels
Operating temperature
Size
Spurious radiations
Interface
User
Power
RF
Transmitter
Output power
TX on switching time
Modulation type
TX modulation bandwidth
FM deviation
Adjacent channel TX power
Spurii
Inputs
Supply
Voltage
Current
+/- 1.5kHz
25kHz (12.5kHz by special order)
128 channels controlled via RS232 interface (8 parallel selected)
º
8pin 0.1" pitch molex
2pin 0.1" pitch molex
3pin 0.1" pitch molex
+20dBm(100mW) ± 1dB (factory adjustable 10 - 200mW)
50 ms
FM, FSK (F1D, F3D)
DC – 3kHz
> ±2.5kHz (>±2kHz for 60 - 65MHz)
-37dBm
<-40dBm
analogue, data (CMOS/TTL compatible)
4.5 - 15V
@ 10mW :
@ 100mW:
@ 200mW:
Receiver
Sensitivity
image / spurious
Blocking
adjacent channel
Spurious radiations
Outputs
Supply
Voltage
Current
Power on to valid audio
Power on to stable data out
º
-10 to +60 C (Storage -30 to +70 C)
59 x 38 x 7 mm
Compliant with ETSI EN 300 220-3 and EN 301 489-3
50mA
110mA
150mA
-118dBm for 12 dB SINAD (for 135-175MHz)
-117dBm for 12 dB SINAD (for 60-65MHz)
-70dB
-85dB
<-65dB (Tested per. ETSI EN 301 489-3, squelch disabled)
<-60dBm
RSSI, carrier detect, audio, data
4.5 - 16V
13mA
28ms (no noise mute)
45ms (with noise mute)
50ms (with or without mute) for 50:50 mark / space
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
3. For UK version the following channel assignment is supplied:
Channel
0
1
2
3
4 -7
8 - 127
Radiometrix Ltd
Frequency (MHz)
173.250
173.275
173.300
173.325
173.225 (only used for alarm applications)
173.325
TX1M/RX1M Data Sheet
page 8
4. For Australian version the following channel assignment is supplied:
Channel
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17 - 65
Frequency (MHz)
N vlaue
150.825
/LOAD 00 6033
150.850
/LOAD 01 6034
150.875
/LOAD 02 6035
150.900
/LOAD 036036
150.925
/LOAD 04 6037
150.950
/LOAD 05 6038
150.975
/LOAD 06 6039
151.000
/LOAD 07 6040
151.025
/LOAD 08 6041
151.050
/LOAD 09 6042
151.075
/LOAD 10 6043
151.100
/LOAD 11 6044
151.125
/LOAD 12 6045
151.150
/LOAD 13 6046
151.175
/LOAD 14 6047
151.200
/LOAD 15 6048
151.225
/LOADTB 6049
in sequence starting at CH 17 (151.250)
Operating principle of internal modem
This device is a simplex link handling a 1200 baud asynchronous datastream (1 start, 8data, 1stop).
Buffering in the transmit end handles TX startup timing requirements, while the presence of sync codes in
the transmitted bursts prevents the receiver from outputting garbage in the presence of noise. No error
correction or retransmission of lost packets is supported. To operate with proper +/-12V RS232 levels an
external buffer (such as a MAX232) will be needed
Physically the modem code resides in the PIC microcontroller which controls the radio functions. The
modem uses the internal hardware serial port of the processor.
Operation: Serial interface
Both transmit and receive modems implement a 32 byte software FIFO. At the transmit end this is used to
allow for the TX1M transmitter start up time (about 32mS), while on receive it buffers arriving packets to the
constant output data rate. All timing and data formatting tasks are handled by the software. The user need
not worry about keying the transmitter before sending data: the link is entirely transparent.
For transmission across the link data is formatted into packets, each comprising 3 bytes of data and a sync
code. If less than 3 bytes are in the transmit end FIFO then a packet is still sent, but idle state replaces the
unused bytes. When the transmit end FIFO is completely emptied, then the transmitter is keyed off .
Operation: Radio interface
Raw data is not fed to the radios. A coding operation in the transmit software, and decoding in the receiver,
isolate the AC coupled, potentially noisy baseband radio environment from the datastream.
The radio link is fed a continuous tone by the modem. As in biphase codes, information is coded by varying
the duration consecutive half-cycles of this tone. In our case half cycles of 500µs (a long, or L) and 250µs (a
short, or S) are used. In idle (or 'preamble') state, a sequence of Ls is sent (resembling a 1kHz tone).
A packet comprises the Synchronising (or address) part : LSSSSSSSSSSSSL followed by the Data part,
made up of twelve Groups (of four half cycles duration). Each Group encodes 2 data bits, so one byte is
encoded by 4 Groups. Although there are 16 possible states for a four half cycle group (from SSSS to LLLL),
only four of the possible states are used for valid data:
All other possible group combinations (except LLLL) are void, and result in the entire packet being rejected
by the receiver software as a noise artifact. Idle state tone (LLLL ....) is decoded as null data, but does not
void the packet, as a packet containing less than 3 bytes still needs to be decoded.
Radiometrix Ltd
TX1M/RX1M Data Sheet
page 9
Application circuits
Antenna
TXD
4
+ 4.4V out (C5)
PGM (C6)
6
GND(C7)
7
9
SGD
P1 (C8)
Parallel
Channel
Select
8
4.5 - 15V
4.5 - 15V
P2 (C9)
P3 (C10)
ADC or µA meter
CD
Data out
Parallel
Channel
Selec t
+ 4.4V 6
100nF
7
8
1
2
3
TXD
4
9
SGD
5
5
PC serial port
PC serial port
1
2
3
1kΩ
AF in (C4)
TX1M-173-5
TXD (C3)
TX
RSSI (C1)
SQF (C2)
AF out (C3)
RXD (C4)
+ 4.4V out (C5)
GND (C6)
PGM (C7)
P1 (C8)
P2 (C9)
P3 (C10)
RX1M-173-5
TXE (C2)
10kΩ
0V (C1)
Transmit Enable
1kΩ
Antenna
Figure 6: Test circuit of TX1M and RX1M
TX1M/RX1M 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 C7) of the TX1M/RX1M and
SGN (pin 5) of DB9M connector should be connected to common ground pins.
The whole frequency/channel table is user reconfigurable to 128 channels within 2MHz band of supplied
frequency subject to regulatory band limits.
Antenna
4
SGD
7
8
9
5
Parallel
Channel
Selec t
1kΩ
PGM (C6)
GND(C7)
P1 (C8)
P2 (C9)
4.5 - 16V
4.5 - 15V
GND (C6)
PGM (C7)
P1 (C8)
P2 (C9)
P3 (C10)
P3 (C10)
1kΩ
AF out (C3)
RXD (C4)
+ 4.4V out (C5)
CD
Data In
10kΩ
6
TX
ADC
0V (C1)
SQF (C2)
RX1M-173-5
TXD
2
3
Data Out
TXE (C2)
TXD (C3)
AF in (C4)
+ 4.4V out (C5)
TX1M-173-5
1
Host Microcontroller
Transmit Enable
VDD
100nF
Parallel
Channel
Select
PC serial p ort
Host Microcontroller
Antenna
0V (C1)
6
7
8
1
2
3
TXD
4
9
5
SGD
PC serial p ort
Figure 7: TX1M and RX1M interfaced to host microcontroller and serial port for configuration
TX1M and RX1M can be directly interfaced to a host microcontroller which can generally be powered by the
regulated +4.4V output on pin 5. 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 P1P3 pins low. Channel select pins of TX1M and RX1M have internal pull-up to 4V supply rail, hence channel
selection operate on inverted logic.
Digital Received Data Output (RXD) pin on the RX1M is an open collector output, which should be pulled-up
to required voltage swing level (e.g. +4.4V or Vcc).
RX1M 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. 1kΩ) according to the current requirement to
produce satisfactory brightness on the LED used.
Radiometrix Ltd
TX1M/RX1M Data Sheet
page 10
Transmitter variant
RX1M in 135-175MHz is designed to be pin and polarity compatible with existing industry standard modules.
AF and Data Output are inverted relative to original transmitted signal. However, RX1M in 60-65MHz band
does not invert the baseband sense.
The transmitter in 135-175MHz is available in two variants – TX1I and TX1M
The non-inverting transmitter called TX1M frequency modulates the carrier frequency in the normal sense
whereby higher modulating voltage increases the carrier frequency and lower modulating voltage decreases
the carrier frequency which results in an inverted AF and Data output on the receiver. This will be the
standard module and exact plug-in replacement for existing industry standard modules.
No
modulation
Vcc
AF
0V
3V
Data slicer
RXD
173.253MHz
173.250MHz
173.247MHz
TX1M
RX1M
Figure 8: Data polarity change from TX1M (non-inverting) transmitter to RX1M receiver
The inverting transmitter called TX1I reverses the Frequency Modulating order whereby the higher
modulating voltage decreases the carrier frequency and lower modulating voltage increases carrier
frequency which results in non-inverting AF and Data output on the receiver. This variant can be used for
applications where data inversion will be problematic.
No
modulation
Vcc
AF
3V
Data slicer
0V
RXD
173.253MHz
173.250MHz
173.247MHz
TX1I
RX1M
Figure 9: Data polarity change from TX1I (inverting) transmitter to RX1M receiver
Ordering information
Part Number
TX1M-xxx-5
RX1M-xxx-5
Description
TX1M transmitter
RX1M receiver
Frequency band
Where xxx is any 1MHz
band from 60-65MHz
Maximum data rate
5kbps
5kbps
TX1M-xxx-5
TX1I-xxx-5
RX1M-xxx-5
TX1M-xxx-10
TX1I-xxx-10
RX1M-xxx-10
TX1M (non-inverting) transmitter
TX1I (inverting) transmitter
RX1M receiver
TX1M (non-inverting) transmitter
TX1I (inverting) transmitter
RX1M receiver
Where xxx is any 3MHz
band from 135-175MHz
for TX1M and any 2MHz
band from 130-180MHz
for RX1M
5kbps
5kbps
5kbps
10kbps
10kbps
10kbps
Radiometrix Ltd
TX1M/RX1M Data Sheet
page 11
Radiometrix Ltd
Hartcran House
231 Kenton Lane
Harrow, Middlesex
HA3 8RP
ENGLAND
Tel: +44 (0) 20 8909 9595
Fax: +44 (0) 20 8909 2233
[email protected]
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/
Information Requests
Ofcom
Riverside House
2a Southwark Bridge Road
London SE1 9HA
Tel: +44 (0)300 123 3333 or 020 7981 3040
Fax: +44 (0)20 7981 3333
[email protected]
European Communications Office (ECO)
Peblingehus
Nansensgade 19
DK 1366 Copenhagen
Tel. +45 33896300
Fax +45 33896330
[email protected]
www.ero.dk
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