RADIOMETRIX WFX2

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
WFX2
Issue 1, 28 May 2012
500mW High power, fast, multi-channel transceiver
The WFX2 is a high power fastswitching multi-channel narrowband
FM transceiver, capable of 500mW RF
power output on 458.5-459.5MHz.
Figure 1: WFX2-458-5
Features
Conforms to EN 300 220-2 and EN 301 489-3
High performance double superhet Low noise PLL Synthesizer with TCXO
Data rates up to 5 kbps for standard module
Usable range over 5km
Fully screened
Feature-rich interface (RSSI, analogue and digital baseband)
User configurable via serial interface
Applications
Heavy vehicle/machine remote controls
Data loggers
Industrial / Commercial Telemetry and Telecommand
In-building environmental monitoring and control
High-end security and fire alarms
Vehicle data up/download
Technical Summary
Operating frequency: 458.525-459.1MHz (UK)
Up to 256 channels (32 individually programmed channels).
Transmit power: +27dBm (500mW) nominal
Supply range: 5V DC
Current consumption: 380mA transmit, 35mA receive
Data bit rate: 5kbps max. (standard module)
9600baud GMSK for (–G variant)
Receiver sensitivity: -118dBm (for 12 dB SINAD)
Radiometrix Ltd
WFX2 Data Sheet
page 1
Figure 2: WFX2 Block Diagram
Radiometrix Ltd
WFX2 Data Sheet
page 2
Figure 3: WFX2 basic footprint
Pin Description
Pins
User
1
2
3
4
Normal mode
GND
RXON
TXON
5
TXE
TXD
6
7
8
9
10
VCC
P3
P2
P1
P0/PGM
Ground
Active Low Receiver ON Indicator logic output
Active Low Transmitter ON Indicator logic output
Active Low Transmit Enable Input. /TXE=5V or Open for Receiver Enable
Transmit Data Input DC coupled for 3V-12V CMOS logic. (5kbps standard)
1Vpk-pk, 2.5V biased DC coupled AFIN input (-G variant for 9600 baud GMSK)
Externally regulated +5V <400mA DC supply
P3 (MSB) Parallel Channel Selection Input ‘0’=5V (NC), ‘1’=0V (GND)
P2 Parallel Channel Selection Input ‘0’=5V (NC), ‘1’=0V (GND)
P1 Parallel Channel Selection Input ‘0’=5V (NC), ‘1’=0V (GND)
P0 (LSB) Parallel Channel Selection Input ‘0’=5V (NC), ‘1’=0V (GND)
Serial Programming Input 5V TTL level UART format (Inverted RS232)
User
1a
RXD
Open collector output of data slicer. 47kΩ internal pull-up to VCC
2a
AF
300mVpk-pk Audio. DC coupled, approx 1V bias
3a
RSSI
DC level between 0.5V and 2.5V. 60dB dynamic range
4a
GND
Ground
RF
1b
RFGND
RF Ground
2b
RF
RF Input/Output for Aerial connection
3b
RFGND
RF Ground
4b
RFGND
RF Ground
Notes:
1. There is a 47kΩ pull-up to 5V on RXD output
2. Logic inputs (P3, P2, P1, P0/PGM, /TXE) have internal pull-ups to 5V
(Approximately 50kΩ on P3, P2 and P1. 10kΩ on P0/PGM and /TXE)
3. /RXON (pins 2) and /TXON (pin 3) are CMOS logic outputs from the control processor.
For interest, pin 2 goes low when the receiver circuits are enabled
pin 3 goes low when the transmitter circuits activate
If both are high for more than 10ms, then this indicates the PLL is out of lock
Normally these pins are left Not Connected (NC)
A 2mA LED (with series 1.5kΩ resistor) from /TXON to 5V will light up when the unit transmits
4. PGM uses 2400bps, 8 data bits, no parity, 1 stop bit, no flow control asynchronous data format
Radiometrix Ltd
WFX2 Data Sheet
page 3
Programming
(255 channel version)
PGM Serial data is sent to the unit on one of the parallel channel select (P0) pin 10. This pin can also be
connected to a parallel channel select switch, so it is very important that the unit does not 'decode'
switch bounce in ordinary operation as a command string, or spurious re-writing of the EEPROM will
result. For this reason the user must send the 16 character string ENABLESERIALMODE (followed
by a carriage return 0x0D) to fully enable the serial command mode before sending any of the command
strings listed below. Command mode is disabled on power down, on reception of a # (0x23) character, or
the execution of a SETPAR command.
Issuing a LOCKSM command (after an ENABLESERIALMODE, of course) will lock the unit into
serial mode (useful if the module is never being used with parallel channel select). In this mode only a
SETPAR will return it to the basic parallel select operation
The command decoder used in the WFX2 firmware is very simple. It consists of a six character text
buffer, followed by a 16 bit numeric register (in any given command entry sequence the first six
characters will be interpreted as text, then any subsequent input will be interpreted as a number.
Numeric input is assumed to be in decimal)
The <cr> character initiates the command. The contents of the text buffer is parsed for a valid
command, the command enacted and the buffer cleared. This process takes several milliseconds. If the
command requires writes to the internal EEPROM, this "command latency" will extend to over fifty
milliseconds.
When a GOCHAN command is enacted when in serial mode, the new "default" channel is stored in
EEPROM. If the unit is then cycled OFF and ON again the channel will remain the last GOCHAN
value (and the parallel port remains inactive) until another ENABLESERIALMODE is sent
The "channel map" relates channel number to PLL synth N register value, and hence frequency.
The first 32 channels have individually programmable N values
The remaining channels (32 to 255) are a sequential table, with programmable start frequency,
maximum channel and step value
GOCHAN aaa
GOTEMP aaa
LOAD aa nnnnn
LOADTB nnnnn
LOADMX aaa
RVALUE rrrr
SINGLE
nnnnn
INCREM
SETPAR
x
SETSER
LOCKSM
DUMPEE
<cr>
/
#
serial select of channel aaa (ch0 to 255) and program to EEPROM
volatile serial select of channel aaa (ch0 to 255)
set value of N for channel aa (channels 0 to 31)
set value of N for start of sequential table (chan 32)
set highest usable channel number (applies to sequential table only)
setting this to zero disables the sequential table
set value for R register
set value of N for single channel operation.
N value NOT stored in e2prom
sequential table step value
channel selected by 4 bit parallel input (ch0 to 15 only)
(also cancels a LOCKSM command)
channel selected by most recent 'gochan' operation
unit now defaults to serial operation at power up
outputs the whole e2prom memory field at 2400 baud, using P3 as an output
(128 consecutive unformatted bytes)
process entry
clear all buffers
disable serial command mode
aaa = channel number from 0 to 255
nnnnn = a synthesizer N register value, (up to 65535)
rrrr = the synthesizer R register value, (up to 16383)
x = sequential table step value (0-7)
N=
R=
f RF − 21.4 MHz 458.525MHz − 21.4 MHz
=
= 17485
25kHz
25kHz
f TCXO
f comparison frequency
Radiometrix Ltd
=
13MHz
= 520 (usually )
25kHz
WFX2 Data Sheet
page 4
Figure 4: WFX2 Modem variant footprint
Figure 5: WFX2 Power Control variant footprint
Figure 6: WFX2 external Power Control circuit
Radiometrix Ltd
WFX2 Data Sheet
page 5
Condensed specifications
Frequency
Frequency stability
Channel spacing
Number of channels
Transmit
Output power
TX on switching time
Modulation type
TX modulation bandwidth
Deviation
Adjacent channel TX power
TX Spurii
Receive
Sensitivity
image / spurious
blocking
adjacent channel
Outputs
Spurious radiations
Supply
458.525 - 459.1MHz (UK)
Other country specific licence-exempt 0.5W UHF band subject to
SAW filter availability
± 1.5kHz
25kHz or 12.5kHz (5kbps standard)
25kHz only (-G variant)
256
Consisting of 32 individually programmed channels, plus a
sequential table covering the remaining 224.
(All 255 can be selected via the serial interface, or 16 via 4
parallel input pins or optional on-board DIP switch)
+27dBm (500mW) ±1dB
<10 ms
FM, FSK (F1D, F3D)
DC – 3kHz Input for CMOS/TTL compatible data
(a wide bandwidth -G version has DC to >5KHz and an analogue
input)
± 3kHz (for 25kHz channel spacing)
-37dBm
All compliant with EN 300-220
(harmonics <-36dBm)
-118dBm for 12 dB SINAD
-80dB
-88dB
<-65dB (Tested per. ETSI EN 300 086)
RSSI, Audio, Data
Compliant with ETSI EN 300 220-3 and EN 301 489-3
Voltage
Current
+5V DC (externally regulated)
380mA nominal transmit
35mA receive
user
10pin 0.1" pitch molex
4 pin 0.1" pitch molex
(4 way DIP switch)
4 pin 0.1" pitch molex
50Ω impedance
Interface
RF
Operating temperature
-20 to +55 °C
(Storage -30 to +70 °C)
ETSI EN 300 220-2 (radio)
ETSI EN 301 489-3 (EMC)
FCC Part 90 compliance
Intended approval
Ordering Information
Part Number
WFX2-458-5
WFX2-458-G
WFX2-458-5-PWC
WFX2-458-G-PWC
Radiometrix Ltd
Variant description
5kbps (max) standard
9600 baud external GMSK modem variant
RF Power Control option
RF Power Control option for –G variant
WFX2 Data Sheet
page 6
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