Data Sheet

Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England
Issue 1, 01 November 2004
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233
CTR44 Eval Kit
Control44 Evaluation Kit
4 relay output with RF remote control
Control44 Evaluation Kit enables
user to evaluate Control44
Encoder/Decoder and appropriate
single frequency Radiometrix module
for a wireless remote control system.
Radio modules can be assessed for
their suitability in terms of range,
price and operating frequency band.
Figure 1: Control44 Encoder (left) and
Decoder (right) Evaluation Kits
Range of Features
4-bit address, 4 bit data select switches
4 relays to control mains powered devices rated up to 8A, 250VAC/30VDC
Visual indication of valid code received and active relays
RF module range testing
Push button for momentary control of relays
Momentary, Latched outputs
Dynamic relay state changes
Setup is simple as Plug-and-Play
RF Remote Control Demonstration
PP3 9V battery powered. Terminal block to prolong use with external power supply
Kit Contents
The CTR44 Evaluation Kit is supplied with the following contents:
CTR44 Eval Kit PCB populated as Encoder (ENC)
CTR44 Eval Kit PCB populated as Decoder (DEC)
Single frequency Radiometrix Transmitter module (ordered separately)
Single frequency Radiometrix Receiver module (ordered separately)
1/4-wavelength monopole or helical antennas (ordered separately)
9V alkaline battery (PP3)
CTR44 data sheet
CTR44 Evaluation Kit manual
Data sheet of Radio module ordered
Additional optional requirements
Radiometrix Ltd
External power supply or 12V DC power adaptor for prolonged use
Electrical device to be controlled with a maximum rating of 8A, 30VDC or 250VAC
Electric Tester Screwdriver
Control44 Evaluation Kit
page 1
General Description
Evaluation Kit uses a common PCB for both Encoder and Decoder just like CTR44-000 IC can be used
as either Encoder or Decoder. However, the modes cannot be changed on the evaluation kit as PCBs are
populated with necessary components for respective mode. Decoder PCB can be easily identified by the
noticeable presence of relays.
Visual Indication
The following status LEDs will be activated depending on the status of CTR44.
TX (Red)
DB3:DB0 (Red)
OK (bright Yellow)
POWER (Green)
Transmitter Enabled;
Relay Activated, Data bit High received
Valid code (data packet) received
Power Supply Switched ON
Quick Functionality Guide
Encoder Function
Continuously encode and SEND
Address Switches (A3:A0)
Data Switches (DB3:DB0)
Momentary SEND
Power Switch
Decoder Function
1 – CO (Common)
2 – NC (Normally Closed)
3 – NO (Normally Opened)
Relay OFF: Terminal 1 – 2 linked
Relay ON: Terminal 1 – 3 linked
LATCH received data until next valid reception
Relay Switch with rating of 8A 250VAC
Relay Switch with rating of 8A 30VDC
Address Switches (A3:A0)
Power Switch
On-board low drop out regulator (LE50CZ) provides clean regulated 5V supply to the radio modules and
microcontroller. However, the relay coils are powered from the external power supply or on-board 9V
alkaline battery via 1N4001 diode (0.7<VF<1.1V) for protection against accidental reverse supply
connection. Although 12V relays are used, the minimum pull-in voltage for relay coil is 8.4V.
Copper on all unused PCB area connected to 0V, provides ground plane necessary for the ¼ wavelength
monopole antenna to perform efficiently. At VHF frequencies, the ground plane dimension is not
sufficient for a ¼ wavelength whip antenna. A helical antenna would perform better compared to a ¼
wavelength monopole antenna without proper ground plane as it does not rely on ground plane as much
as a monopole.
Sockets are provided for easy insertion of radio modules. However, long pins and the large gap between
ground plane of the Evaluation Kit PCB and ground plane of the module will degrade the range
performance of the module. In a finished product, the SIL type modules should be mounted flat on the
PCB with their pins trimmed to bare minimum. Can lugs, which are pre-soldered to ground plane of the
module, should also be soldered to ground plane pads on the main PCB of the product.
Frequency of the ceramic resonator (RES) can be decreased (e.g. 2MHz) to reduce the bit rate (1200bps)
through radio when using radio receiver with reduced bandwidth optimised for longer range. For fast
activation, it can also be increased up to 20MHz, however, the CTR44-000-DIL should be replaced with
CTR44H-000-DIL which provides higher drive level for >4MHz resonator to oscillate.
Radiometrix Ltd
Control44 Evaluation Kit
page 2
Bit Rate through radio
2kbps (55ms power-up preamble)
BiM1T, RX1-XXX.XXX-1.2
TX1, RX1
TX2, RX2, TX3A, RX3A
CTR44 Encoder Board
In this mode, jumper link (JP1) connects the MODE pin of the CTR44-000-DIL to 5V supply line. RST
pin is also tied to 5V. 5V supply to CTR44 IC is decoupled close to its VCC pin via 100nF Ceramic
capacitor (C1).
CTR44 has an internal weak pull-up to 5V on its Address and Data pins. Therefore the DIL switches
when switched ON shorts the respective pin to 0V. Therefore, address/data bit values are inverted
relative to switch positions. Address and Data Switch number starts from 1 instead of 0. (SW2 No
PNP transistor (T4) is used to Enable and supply power to SIL type transmitters. It inverts the Active
Low TXE from CTR44 to Active High Enable for TX1/TX3A and connects supply to module when
switched ON.
1) Insert the supplied Radiometrix Transmitter module into the appropriate slot with RF pins
towards BNC connector
SIL slots marked TX1/2/3 are for TX1/TX2/TX3A modules
DIL slot is for BiM1T module (Note: on-board legend orientation is upside down)
2) Connect the supplied antenna to BNC connector according to module frequency
3) Set desired Address Bits by sliding each switch (ON=0=5V, OFF=1=5V)
4) Set Data Switch position to OFF (=1=5V) for relays which need to be activated
5) Insert the supplied 9V battery or connect an external 7.5V-16V supply.
6) Go to Decoder Setup
7) Slide the Power Switch to ON
8) Press the RED SEND button to momentarily activate the relays
Insert the supplied JP2 jumper across both pins to continuously SEND.
CTR44 will execute a power-up transmission when switched ON just after procedure 7. TX LED will be
momentarily lit followed by DB LEDs for which Data Switch was set to OFF position. Relay will make a
‘clicking sound’ when the internal relay switch positions are changed. This power-up transmission
feature can be used for low cost remote control which requires a single switch/button operation with
default address and data.
If the SEND button switch (SW3) is pressed intermittently, the Encoder PCB will transmit a short
bursts of Address and Data switch settings to decoder PCB. Instead of holding the depressed SEND
button, the Jumper JP2 can be used for continuous transmission which allows user to dynamically
change data switches.
When performing range test, the SEND Jumper (JP2) should be inserted on the Encoder PCB to
transmit continuously from a fixed location. User can walk around with the Decoder PCB and monitor
the status of OK and DB3:DB0 LEDs.
Radiometrix Ltd
Control44 Evaluation Kit
page 3
CTR44 Decoder Board
It is populated with additional components to drive the Relay and provide visual indication of received
data bits. NPN transistors (T3:T0) will provide the required drive current and voltage drop to activate
relay coil to pull-in the internal relay switch and to activate the LEDs if the received data bit is ‘1’.
Diodes (D7:D4) provide protection against back EMF developed by the relay coil when switching OFF.
Since the STROBE pulse signal generated by the CTR44 is 10µs long, OK LED output may not be
visible in bright sunlight.
1) Insert the supplied Radiometrix Receiver module into the appropriate slot with RF pins
towards BNC connector
SIL slots marked RX1/2/3 are for RX1/RX2/RX2A/RX3/RX3A modules
DIL slot is for BiM1R module (Note: on-board legend orientation is upside down)
2) Connect the supplied antenna to BNC connector according to module frequency
3) Set Decoder PCB Address Bits to match Encoder PCB Address Bits
4) Insert the JP2 jumper to latch (hold) received data (relay) position until next valid change
Remove JP2 to keep relay active only while reception is valid (Useful for range test)
5) Connect 250VAC device(s) to the 3-way terminal block(s). [Observe Safety Procedure]
6) Insert the supplied 9V battery or connect an external 9V-12V supply.
7) Slide the Power Switch to ON
8) Return to Encoder Setup Procedure 7.
SAFETY WARNING: Extra care should be taken when handling the electrical connection from relay to
250AC device. Mains power should be disconnected before connecting the wires to 3-way terminal blocks
to prevent electric shock. Exposed wires or terminal block should not be touched during evaluation.
LATCH Jumper (JP2) can be used to hold the received data bit value (Relay Position) without
continuously transmitting the same data bit values. Relay position can be updated and maintained with
a momentary update transmission after adjusting Data Switch positions on the Encoder PCB.
When performing range test, the Latch Jumper (JP2) should be removed to notice loss of reception
when the DB3:DB0 LED starts to flicker. Flickering indicates that the receiver is beyond its maximum
reliable operating range or in weak RF signal reception area where some of the packets are correctly
received while others are lost. In building environment, DB LED may stop working even though
receiver may be within its operating range due to ‘null-spot’. Moving the position or orientation the
decoder (antenna) will enable receiver to continue to receive sufficient RF signal level for decoder to
correctly decode the transmitted data.
The above procedures can be used in a site survey to identify areas of weak RF signal reception, nullspots and to find best position for antenna placement to maximise coverage.
Radiometrix Ltd
Control44 Evaluation Kit
page 4
Figure 2: Schematic of CTR44 Evaluation Kit
Radiometrix Ltd
Control44 Evaluation Kit
page 5
Radiometrix Ltd
Control44 Evaluation Kit
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Figure 3: Component layout of CTR44 Evaluation Kit PCB
Radiometrix Ltd
Hartcran House
231 Kenton Lane
Harrow, Middlesex
Tel: +44 (0) 20 8909 9595
Fax: +44 (0) 20 8909 2233
[email protected]
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:
Information Requests
Riverside House
2a Southwark Bridge Road
London SE1 9HA
Tel: +44 (0)845 456 3000 or 020 7981 3040
Fax: +44 (0)20 7783 4033
[email protected]
European Radiocommunications Office (ERO)
Nansensgade 19
DK 1366 Copenhagen
Tel. +45 33896300
Fax +45 33896330
[email protected]