RF SOLUTIONS DS-KAPPA-T868-2 User manual

KAPPA-T868
DS-KAPPA-T868-2
Smart Radio Telemetry Module
Applications
• Remote control
• Sensors
• I/O Telemetry devices
• Remote switching
• Remote traffic lights
Part No Description
KAPPA-T868 Radio telemetry module SIL package 868MHz band
KAPPA-T868-SO Radio telemetry module SMT package 868MHz band
Description
The KAPPA-T receiver module provides a reliable radio link directly compatible
with any of the RF Solutions handheld transmitter range on 868MHz such as
the compact FOBBER key fob, the multi-buttoned ELITE-T8 as well as the long
range ELITE-XT and the rugged, industrial SABRE.
KAPPA-T868 can be used with the BRAVO-T868 as a module to module
solution.
Features
• Simple and low cost
• 4 channel receiver module
• Range up to 500 metres
• 4 digital input/outputs
• Minimal external components
• Secure data protocol
• Ultra low power 1.8—3.6V
• Easy pairing process
• 869.5MHz spot frequency
• +13dBm transmit power
• SMT or SIL package
• Incorporates self test mode
• CE compliant for EU licence free use
Ordering Information

KAPPA Telemetry Receiver Module
DS-KAPPA-T868-2
Pin-out
Pin No Name Direction Description
2 ANT In Antenna input/output 50ohm impedance
1, 11 GND In Connect to ground
3, 4, 5, 12 OP1-4 Output Switched outputs: Active High
Digital outputs: LVCMOS output drive
7 SDO Output Serial switch status data output pin.
See Page 4 for details
8 LRN In/Out
Learn switch input: normally ‘high’ momentarily
connect to GND to enter Learn Mode.
Also acts as an output for the Learn LED
9 MOM/
LATCH In
Set outputs as momentary or latching in
operation.
Internally tied high.
Connect to GND for momentary
Disconnect for latching
10 Vcc In Supply voltage
General description of operation
The KAPPA-T868 module is a small and simple to use receiver module which operates with RF
Solutions transmitters. Operating range will be dependent on the transmitter used.
The versatile KAPPA-T868 module is able to be used to create systems which are module to
module (using BRAVO-T868 or as a receiver for existing RF Solutions range of 868MHz
transmitters such as:
FOBBER - Compact key fob transmitter with 50 - 100m
ELITE-T8 - Low profile compact handheld transmitter with 150 - 250m
ELITE-XT - Long range handsets with long battery life and range up to 2km
SABRE - Rugged industrial handheld transmitters with range up to 2km
ANT
GND
OP 1
1 2 3 4 5 6 7 8 9
10 11 12
OP 2
OP 3
NC
SDO
LRN
MOM/LATCH
VCC
GND
OP4
Pin Description

KAPPA Telemetry Receiver Module
DS-KAPPA-T868-2
KAPPA-T868 Operation
1. Operation
The KAPPA module will remain in a low power listening mode at all times when power is
present.
When a valid packet is received it will wake and action any output state changes required.
2. Moment are or Latching Function
KAPPA actions button state change only, therefore momentary mode requires receipt of a
“button down/input active” packet and a “button up/input not active” packet from a
transmitter. In momentary mode on receiving a “button down” the KAPPA will hold its output
active until a “button up” is received. In latching mode KAPPA must see “button down” then
“button up” in order to make a state change to either activate or deactivate an output.
3. Pairing
Using Pin 8 it is possible to “pair” transmitters into the receiver memory as follows:
1. Briefly GND Pin 8, the LED will flash once - this shows OP1 is selected
2. GND Pin 8 again after release the LED will flash twice to show OP2 is selected
3. Repeat above process to select OP3 or 4
4. With the desired output selected (and before a 10sec timeout)
5. Press the button or activate the input on the transmitter to be paired.
6. This will complete the pairing and the LED will flash twice to confirm
Memory: maximum storage is 70 pairings.
4. Erase
To erase the KAPPA memory and remove all stored transmitter input pairings press and hold
the learn button for 10 seconds.
The LED will illuminate while the button is held and after release will flash 3 times to confirm
memory erase is complete.
Above assumes LED connection as per schematic example on Page 5
5. Outputs
Outputs are LVTTL / LVCMOS at Vcc and are Active high.
Mode LED Description
Normal operation
Flickering ON Module is receiving data
OFF No RF data is being transmitted/received
Learn and erase
ON
While input is connected to Vcc (ie during
button press) .
Flashes to show output selection and paring
success
Learn mode times out after 10 seconds
Flashing twice KAPPA pairing successful
Flashes three
times ERASE successful

KAPPA Telemetry Receiver Module
DS-KAPPA-T868-2
KAPPA Receiver module serial data output
Serial data output operation:
The KAPPA outputs the serial number, button and battery status of the transmitter encoder.
This data may be fed directly to a microcontroller or RS232 type driver circuit which may then be
fed directly to a PC serial port.
Serial data is output on every packet receipt - this equates to every 1/4 second whilst a button
is held down/input active. This data is output is valid regardless of whether the Transmitter/
Encoder has been learnt to the KAPPA or not. The serial data packet contains a learn bit to show
if an encoder input is learnt.
Serial data configuration :
Baud Rate: 19,200
Data bits: 8
Parity: none
Stop bits: 1
Handshaking: none
Serial
data
for-
mat:
Serial number [SN1 SN2 SN3]:
Made up of three 8-bit bytes where the most significant byte is transmitted first.
Example: 12ABAA (hexadecimal) or 0001 0010 1010 1011 1010 1010 (binary)
Tx input stats [IP1-8 IP9-16]: made up of two 8-bit bytes.
The low order byte is sent first representing inputs 8 down to 1 where the MSb is input 8 and
the LSb is input 1. The high order byte is sent next representing inputs 16 down to 9 where the
MSb is input 16 and the LSb is input 9.
A bit at state 1 represents an encoder input as active.
Using this method inputs can be multiplexed giving maximum versatility.
Example: 00000000 00010000 Shows input 13 active.
10000000 00000000 Shows input 8 active
10000001 10000000 Shows inputs 16, 8 and 1 active
Learn status and low battery:
One 8 bit byte:
Bit0 shows low battery on Tx - where 1 = Low battery
Bit1 shows learn status of Tx - where 1 = Learnt
Bespoke versions
Customised versions of the all transmitters, receivers and chipsets are available to provide a
bespoke remote chipset for OEM applications. Please contact our sales or support teams for
further information.
SN1 SN2 SN3 IP1-8 IP9-16 TXV
Line Feed - $0A (hex)
Input status on Tx
3 byte serial number
STAT CR LF 9 bytes of serial data sent
Carriage Return - $0D (hex)
Tx battery voltage (if available)
Learn status and low battery

KAPPA Telemetry Receiver Module
DS-KAPPA-T868-2
KAPPA example application circuit
10 11 12
98
7
321
Vcc
GND
ANT 5 64
Output 4
Output 3
Output 2
Output 1
560R
Learn
LED Learn
switch
Vcc
Description:
This example shows a KAPPA module receiver with all 4 outputs connected.
Note: The external learn switch and learn LED are both shown connected in this example.
10 11 12
98
7
321
Vcc
GND
ANT 5 64
560R
Learn
LED
Vcc
1
3
4
5
2
6
16
11
10
12
9
14
7
13
8
MAX232
1uF
100nF
100nF
100nF
100nF
100nF
Data
KAPPA connected with Serial data output via MAX232

KAPPA Telemetry Receiver Module
DS-KAPPA-T868-2
Range Considerations
The antenna choice and position directly affects the system range, keep it clear of any large
metal parts. The best position is protruding vertically from the top of the product. This is often
not desirable for practical reasons and thus a compromise may be needed. Note that the space
around the antenna is as important as the antenna itself. All radio systems are dependent on a
radio signal being received through airspace.
The range quoted is the optimal in direct line of sight without obstacles and in good atmospheric
conditions.
Range is affected by many things, for example local environmental conditions, atmospheric
conditions, interference from other radio transmitters. For evaluating the local environment
please see our RF Meter (DS006).
Mechanical Dimensions
Self Test Mode
The KAPPA module incorporates a self test which is initiated by applying power with the learn
button held down.
The KAPPA module then performs the following functions:
1. All outputs operate in turn 1-4 ON/OFF twice
2. All outputs flash ON/OFF 5 times - 1&3 and then 2&4
3. Transmits a full power RF signal for 5 seconds while flashing the learn LED
4. Enters RSSI (Received Signal Strength Indication) mode where outputs 1-4 are activated
as a bar graph type output according to the strength of a valid RF signal received (from
any carrier operating at the appropriate frequency (869.50MHz ). 4 Outputs on being
maximum strength.
5. A reset will be required to exit
1 2 3 4 5 6 7 8 9
10 11 12
11.00mm
31.50mm
Pin Spacing: 2.54mm /
0.1"
Pin Size: 0.6mm x
0.4mm
PCB: 1mm FR4
6.50mm
1.00mm
2.5mm MAX
Pads along one edge with half
Castallated vias
Pin Spacing: 2.54mm / 0.1"
Pad Size: 1.5mm x 1.5mm
PCB: 1mm FR4
0.75
SMT Version

KAPPA Telemetry Receiver Module
DS-KAPPA-T868-2
Technical Specifications
Temperature
Parameter Min Max UnitsTypical
Supply Voltage 1.8 3.6 V
Voltage on any Input Vcc > 2.2V
Vcc < 2.2V
5.8
Vcc+3.
6
V
V
KAPPA-T Supply current:
When Receiving 24 mA .16
Max Input power (through RX antenna) +5 dBm
Max Current Sourced / Sunk (Per I/O) 100 mA
Max Current Sourced / Sunk (Total) 200 mA
Parameter Min Typical Max Units
Operating Temperature -20 +55 oC
Operating Frequency 869.5 MHz
Operating Freq for 915MHz version 915.00 915.27 MHz
Operating Temperature -20 +55 oC
KAPPA- Rx Sensitivity -121 dBm
Electrical Characteristics
Time from TX button press to output activation 20 ms
Minimum on time for outputs 25 ms

KAPPA Telemetry Receiver Module
DS-KAPPA-T868-2
Recommended Antenna 868MHz
We have a range of antennas on 868MHz that are suitable for
use with the KAPPA modules.
To view our range please visit our website:
www.rfsolutions.co.uk
RF Meter
RF Multi Meter is a versatile handheld test meter checking
Radio signal strength or interference in a given area.
The Multi-Meter can both transmit and receive signals
making it possible to test an installation location for
suitability before installing equipment. The Multi-Meter is
very hard wearing, long lasting and simple to use. It has 4
selectable frequencies, changeable at the touch of a button.
It also has an auto shut off feature for battery saving.

KAPPA Telemetry Receiver Module
RF Solutions Ltd. Recycling Notice
Meets the following EC Directives:
DO NOT
Discard with normal waste, please recycle.
ROHS Directive 2011/65/EU and amendment 2015/863/EU
Specifies certain limits for hazardous substances.
WEEE Directive 2012/19/EU
Waste electrical & electronic equipment. This product must be disposed of through a licensed WEEE collection point. RF Solutions Ltd., fulfils its
WEEE obligations by membership of an approved compliance scheme, environment agency registration number WEE/JB0104WV.
Simplified Declaration of Conformity (RED)
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Disclaimer:
Whilst the information in this document is believed to be correct at the time of issue, RF Solutions Ltd does not accept any liability whatsoever for
its accuracy, adequacy or completeness. No express or implied warranty or representation is given relating to the information contained in this
document. RF Solutions Ltd reserves the right to make changes and improvements to the product(s) described herein without notice. Buyers and
other users should determine for themselves the suitability of any such information or products for their own particular requirements or specifica-
tion(s). RF Solutions Ltd shall not be liable for any loss or damage caused as a result of user’s own determination of how to deploy or use RF Solu-
tions Ltd’s products. Use of RF Solutions Ltd products or components in life support and/or safety applications is not authorised except with ex-
press written approval. No licences are created, implicitly or otherwise, under any of RF Solutions Ltd’s intellectual property rights. Liability for loss
or damage resulting or caused by reliance on the information contained herein or from the use of the product (including liability resulting from negli-
gence or where RF Solutions Ltd was aware of the possibility of such loss or damage arising) is excluded. This will not operate to limit or
restrict RF Solutions Ltd’s liability for death or personal injury resulting from its negligence.
Waste Batteries and Accumulators
Directive 2006/66/EC
Where batteries are fitted, before recycling the product,
the batteries must be removed and disposed of at a
licensed collection point.
RF Solutions battery producer number: BPRN00060.