CXT2-458-1 [RADIOMETRIX]
Multi channel 25kHz NBFM remote control TX/RX;
| 型号： | CXT2-458-1 |
| 厂家： | 
RADIOMETRIX LTD |
| 描述： | Multi channel 25kHz NBFM remote control TX/RX |
| 文件： | 总12页 (文件大小：654K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
CXT/CXR
Issue 1, 27 July 2012
Multi channel 25kHz NBFM remote control TX/RX
The CXT transmitter and CXR receiver
modules offer a multi channel, low power,
and reliable remote control data link. This
makes the CXT/CXR pair ideally suited to
those low power applications where
existing
wideband
modules
have
insufficient range, or where low cost multi-
channel operation is needed without
compromising on RF specification or
regulatory requirement.
Figure 1: CXT2 transmitter and CXR2 receiver
Features
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Conforms to EN 300 220-3 and EN 301 489-3
High performance double superhet. PLL synthesizer with TCXO
SAW front-end filter
Usable range over 1km
16 bit unit address (65535 unique addresses)
Momentary and Latched outputs
Fully screened. Low profile
Re-programmable via RS232 interface
Low power requirements
Applications
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Industrial telemetry and telecommand
HVAC controls
Wireless door entry systems
Simple On/Off switching
In-building environmental monitoring and control
High-end security and fire alarms
Heavy vehicle/machinery controls
Status reporting and monitoring secure systems
Technical Summary
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Operating frequency: 173.200 - 173.325MHz (UK band)
150.825 - 152.450MHz (Australian Band)
433.875 - 434.650MHz (EU band)
458.525 - 459.1MHz (UK band)
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Other custom VHF and UHF bands
32 channels @ 25kHz channel spacing
Transmit power: +10dBm (10mW) / +20dBm (100mW)
Supply range: 3.1 – 15V (TX @ 10mW and RX), 4.1 – 15V (TX @ 100mW)
Current consumption: 34mA @ 10mW, 90mA @ 100mW (transmit) and 20mA (receive)
Receiver sensitivity: -118dBm (for 12 dB SINAD)
Serial configuration by inverted RS232 at 3V CMOS level
Radiometrix Ltd
CXT/CXR – Multi channel Remote Controller Data Sheet
page 1
Easy control functions with CXT and CXR:
There are certain user applications where a very simple ‘on/off’ control function is needed (for example:
control of floodlights, alarm sounders, machine override shutdown). Normally such applications require a
simple microprocessor or dedicated remote control chip to be added to the radio module, incurring extra size,
cost and sometimes software overhead.
Not anymore. The CXT and CXR module pair (based on either LMT2/LMR2 (UHF version) or LMT1/LMR1
(VHF version)) includes a simple-to-use single function controller/actuator, implemented in the firmware of
the radio’s internal processor. This code allows the unit to be used as a very simple remote control product,
with either a latched or a momentary output. No external control device is required.
Two inputs are provided on the CXT transmitter. Grounding input A sends a coded datastream to the CXR
receiver which commands it to latch it’s A output high (+3v). Grounding the transmitter B input sends a
datastream which resets the receiver A pin to zero. Also, for the duration of the B transmission, the receiver
B output is high. The minimum duration of a B output pulse is 300mS.
The CXT transmits whenever either A or B are low, but to function the TXE must also be low (this can be tied
low for simplicity, or diode 'or'ed with the A, B inputs to minimise current consumption)
The data format uses is a modified biphase format with an average data rate of 600 bits per second. A 42 bit
data burst is used (preceded by ample preamble). This incorporates a 16 bit unit address. This is easily
modified via the 2400 baud serial communication port (SI pin), which allows both the unit address and the
channel number (1 of 32 operating frequencies) to be easily modified. Commands are in an easy to
understand ‘ascii text and decimal numbers’ form, simply entered by hand from any terminal program. Once
programmed, values are stored in non-volatile memory.
Radiometrix Ltd
CXT/CXR – Multi channel Remote Controller Data Sheet
page 2
Radiometrix Ltd
CXT/CXR – Multi channel Remote Controller Data Sheet
page 3
Figure 3: CXT footprint (top view)
Pin description –CXT
Pin
1a
2a
3a
4a
Name
Vcc
0V
N_TXE
TXD
Function
3.1 – 15V power supply
Ground
Transmit Enable (active low)
Link to 4b
1b
SI
Serial frequency programming / configuration1
2b
3b
4b
A (in)
B (in)
T_out
Main (latching) input
Second (cancel) input
Link to 4a
Notes:
1. Serial programming is by an inverted, CMOS logic level, 2400 baud RS232 datastream applied to
the SI pin.
2. TXE has a 100kΩ pullup to Vcc
3. Do not exceed 3v logic levels on SI, A or B.
4. SI input has pullup (50K) to 3v internal rail.
5. A and B inputs have pullups (50K) to 3v internal rail. (A, B inputs: active low)
6. CX versions can be identified by the presence of C7, on the underside of the LMT series TX board
Radiometrix Ltd
CXT/CXR – Multi channel Remote Controller Data Sheet
page 4
Figure 4: CXR footprint (top view)
Pin description –CXR
Pin
1a
2a
3a
4a
5a
Name
Vcc
0V
RXE
RXD
N/C (AF out)
Function
3.1 – 15V power supply
Ground
Receiver Enable (active high)
Link to 4b
No connection, 700mV p-p audio. DC coupled, approx 0.8v bias.
1b
SI
Serial frequency programming / configuration1
2b
3b
4b
5b
A (out)
B (out)
R_in
Main (latching) output
Secondary output
Link to 4a
DC level between 0.5v and 2.2v. 60dB dynamic range
RSSI
NOTES:
1. Serial programming is by an inverted, CMOS logic level, 2400 baud RS232 datastream applied
to the SI pin.
2. Do not exceed 3v logic levels on SI, A or B.
3. SI input has pullup (50K) to 3v internal rail.
4. A and B outputs are 3v cmos, active high. Up to 5mA may be drawn from each
5. CX versions can be identified by the presence of C7, on the underside of the LMR series RX
board
Radiometrix Ltd
CXT/CXR – Multi channel Remote Controller Data Sheet
page 5
Condensed specifications
Frequency
433MHz EU, 458MHz / 173MHz UK and 151MHz Australian bands
EU 433.875 - 434.65MHz
UK: 458.525 - 459.1MHz
173.200 - 173.325MHz
Australian: 150.825 - 152.450MHz
Other custom VHF and UHF bands
1.5kHz
Frequency stability
Channel spacing
Number of channels
25kHz
32 (controlled via RS232 interface)
Operating temperature
Spurious radiations
-20 ºC to +55 ºC (Storage -30 ºC to +70 ºC)
Compliant with ETSI EN 300 220-3 and EN 301 489-3
Transmitter
Output power
+10dBm (10mW) 1dB (factory adjustable 1 - 25mW)
+20dBm (100mW) 1dB (factory adjustable 25 - 100mW)
3kHz
2.5kbps FSK (biphase) data stream
DC – 5kHz (3V CMOS compatible)
<-37dBm
Peak deviation
Modulation type
TX modulation bandwidth
Adjacent channel TX power
TX spurious
<-45dBm (no output in Standby)
Supply
Voltage
3.1V – 15V (1-25mW)
4.1 – 15V (25 – 100mW)
Current
35mA @ 10mW (nominal)
65mA @ 50mW (nominal)
100mA @ 100mW (nominal)
<9µA standby (TXE high or floating)
data (CMOS/TTL compatible)
33 x 23 x 9mm (BiM sized footprint, new pinout)
10 (8) pin 0.1" pitch dual row (5+5 or 4+4) header
2pin 0.1” pitch
Inputs
Size
Interface
User
RF
Recommended PCB hole size
1.2mm
Receiver
Sensitivity
AF bandwidth (-3dB)
-115dBm for <0.1% data errors)
4kHz
image
spurii / adjacent channel
blocking
LO re-radiation
Auxiliary outputs
Supply
<-60db
<-65db
- 84dB
-60dBm
RSSI, audio
Voltage
Current
3.1V – 15V
20mA receive
<1µA standby (RXE low)
46 x 23 x 9mm
Size
Interface
User
RF
Recommended PCB hole size
10 pin 0.1" pitch dual row (5+5) header
2pin 0.1” pitch
1.2mm
Radiometrix Ltd
CXT/CXR – Multi channel Remote Controller Data Sheet
page 6
Programming the CXT and CXR
A 2400 baud cmos level ‘inverted RS232 format’ (1 start bit, 8 data, 1or 2 stop bits, no parity) is used.
These units employs a sub-set of the programming commands used by standard LMT/LMR modules. In
addition, the command AVALUE is used to set the address number.
As the SI pin is dedicated to serial communication only, the ‘ENABLESERIALMODE’ command string is NOT
required.
To successfully program the unit it must be in active state (RXE high, or TXE low), so provision should be
made to force the unit into this state while programming (either a jumper, or a third pin on the programming
connector, could be used).
GOCHAN aa
AVALUE bbbbb
LOAD aa nnnnn
RVALUE rrrr
<cr>
Serially select channel aa, where aa is ch0 to ch31
Set value for unit address
Set value of N register for channel aa, where aa is Channels 0 to 31
Set value for R register
Process entry
/
Clear all buffers
aa = a two digit channel number from 00 to 31
nnnnn = synthesizer N register value (up to 65535)
rrrr = synthesizer R register value (up to 16383)
bbbbb = unit address (up to 65535)
fTCXO
fRF
13MHz
25kHz
433.900MHz
25kHz
CXT = NTX
=
=
=17356
R =
=
, So R=520
fChannelspacing
fchannelspacing
VHF CXT units have 10MHz, not 13MHz reference oscillators:
fTCXO
10MHz
25kHz
R =
=
, So R=400 (for VHF CXT)
fchannelspacing
fRF − 21.4MHz
433.900MHz − 21.4
25kHz
CXR = NRX
=
=
=16500
fChannelspacing
Note: A pause of at least 50ms must be allowed between command strings (EEPROM programming time).
Radiometrix Ltd
CXT/CXR – Multi channel Remote Controller Data Sheet
page 7
Radiometrix Ltd
CXT/CXR – Multi channel Remote Controller Data Sheet
page 8
Antenna requirements
Three types of integral antenna are recommended and approved for use with the module:
A) Whip
This is a wire, rod ,PCB track or combination connected directly to RF pin of the module.
Optimum total length is 16.4cm (1/4 wave @ 433MHz). Keep the open circuit (hot) end well
away from metal components to prevent serious de-tuning. Whips are ground plane
sensitive and will benefit from internal 1/4 wave earthed radial(s) if the product is small and
plastic cased
B) Helical
C) Loop
Wire coil, connected directly to RF pin, open circuit at other end. This antenna is very
efficient given it’s small size (20mm x 4mm dia.). The helical is a high Q antenna, trim the
wire length or expand the coil for optimum results. The helical de-tunes badly with proximity
to other conductive objects.
A loop of PCB track tuned by a fixed or variable capacitor to ground at the 'hot' end and fed
from RF pin at a point 20% from the ground end. Loops have high immunity to proximity de-
tuning.
A
whip
***
***
*
B
helical
**
**
***
C
loop
*
*
**
Ultimate performance
Easy of design set-up
Size
Immunity proximity effects
Range open ground to similar antenna
*
500m
**
200
***
100
The antenna choice and position directly controls the system range. Keep it clear of other metal in the
system, particularly the 'hot' end. The best position by far, is sticking out the top of the product. This is often
not desirable for practical/ergonomic reasons thus a compromise may need to be reached. If an internal
antenna must be used, try to keep it away from other metal components, particularly large ones like
transformers, batteries and PCB tracks/earth plane. The space around the antenna is as important as the
antenna itself.
0.5 mm enameled copper wire
close wound on 3.2 mm diameter former
RF
433 MHz = 24 turns
A. Helical antenna
Feed point 15% to 25% of total loop length
track width = 1mm
RF-GND
2
4 to 10 cm inside area
C2
C1
RF
C3
C4
B. Loop antenna
16.4cm
wire, rod, PCB-track or a combination
of these three
RF
433 MHz = 16.4 cm total from RF pin.
C. Whip antenna
Figure 6: Antenna types (433MHz version)
Radiometrix Ltd
CXT/CXR – Multi channel Remote Controller Data Sheet
page 9
Ordering Information:
Part No.
VHF
Description Frequency band (MHz)
Supply (V)
RF power (mW)
CXT1-173-1
CXR1-173-1
CXT1-151-1
CXR1-151-1
Transmitter
Receiver
Transmitter
Receiver
173.200 - 173.325
173.200 - 173.325
150.825 - 152.450
150.825 - 152.450
3.1 -15
3.1 -15
4.1 -15
3.1 -15
10
100
UHF
CXT2-433-1
CXR2-433-1
CXT2-458-1
CXR2-458-1
Transmitter
Receiver
Transmitter
Receiver
433.875-434.650
433.875-434.650
458.525 - 459.1
458.525 - 459.1
3.1 -15
3.1 -15
4.1 -15
3.1 -15
10
100
Notes:
1. CXT/CXR are available on number of other VHF and UHF frequencies. Other non standard UHF
band frequencies are subject to SAW filter availability.
Radiometrix Ltd
CXT/CXR – Multi channel Remote Controller Data Sheet
page 10
APPENDIX:
CXT2-433-1 & CXR2-433-1 Application boards
Radiometrix Ltd
CXT/CXR – Multi channel Remote Controller 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
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/
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
information.requests@ofcom.org.uk
European Communications Office (ECO)
Peblingehus
Nansensgade 19
DK 1366 Copenhagen
Tel. +45 33896300
Fax +45 33896330
ero@ero.dk
www.ero.dk
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