BRAVO
SmartRadio Telemetry Module
Features
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8 Channel transceiver module
Range up to 1,000 metres
8 Digital input/outputs
Receiver outputs mirror
transmitter inputs
Minimal external components
Secure data protocol
1.8—
Ultra low power 1.8—3.6V
CE compliant for licence free use
Easy pairing process
One to one and one to many operation
869.5MHz operating frequency
+13dBm transmit power
Single in line module
Applications
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Remote Control
Remote Networking
Remote Switching
Remote Traffic Lights
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The BRAVO-T telemetry module provides a reliable transceiver
based industrial remote switch with up to 1,000 metres range.
Two or more modules may be combined to provide a simple or com-
plex network of radio switches.
Part No
BRAVO-T868
Description
Radio telemetry module SIL package
DS-BRAVO-e
BRAVO Telemetry Module
Pin out
Pin Description
Pin No
1
2, 15
Name
ANT
GND
Direction
In
In
Description
Antenna input/output 50ohm impedance
Connect to ground
When configured as transmitter:Active low
Digital inputs: high impedance inputs
When configured as receiver: Active High
Digital outputs: LVCMOS output drive
Learn switch input: connection to an external,
optional learn switch.
If on board switch or to be used this input can
be left unconnected
Optional LED drive output Mirrors on-board LED
Connect to Vcc : Module is a transmitter
Connect to GND : Module is a receiver
Transmitter= Input
Connect to Vcc : Watchdog is disabled
Connect to GND : Watchdog is enabled
Receiver= Output
High : Watchdog is healthy
Low : Watchdog Fault!
Supply voltage
Leave unconnected
3, 4, 7, 8, 9,
11, 12 14
I/O1-8
In / Out
5
LRN SW
In
6
10
LRN LED
TX/RX
Out
In
13
W-DOG
In / Out
16
17,18
Vcc
N/C
In
N/A
General description of operation
Each module can be set to act as a ‘ transmitter’ or ‘receiver’ A telemetry system is achieved
when two modules are paired together, as transmitter (BRAVO-Tx) and receiver (BRAVO-Rx).
Each time any input changes on the BRAVO-Tx, it will transmit the status of ALL inputs to the
paired BRAVO-Rx(s). The BRAVO-Rx(s) which will set their outputs to match the BRAVO-Tx
inputs. After each state change the modules will return to sleep mode.
Note: All of the 8 channels are common to all modules in a system
Example: If you are using a system with two or many Bravo modules each channel be will com-
mon to all modules ie. if you change state on transmitter input 8, then all receiver output 8’s
will also change state.
DS-BRAVO-1
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BRAVO Telemetry Module
BRAVO Configured as a TRANSMITTER
1.
Operation
When configured as a transmitter the BRAVO module will automatically default to low power
sleep mode until any input state change takes place.
On receipt of an input state change the BRAVO-Tx will transmit a packet showing the state
of all inputs at the time of the change (multiple input changes may take place
simultaneously)
1.1 Watchdog
If watchdog is enabled the Bravo-Tx will transmit a background packet containing the current
status of the inputs every 5 minutes.
1.2 Digital Inputs
High impedance inputs, LVCMOS / LVTTL compatible, 5V tolerant.
Can be connected directly to CMOS/TTL logic or switch inputs connected to 0V or VCC
A change on the input will cause the BRAVO-Tx to wake, read all inputs and initiate RF
transmission.
Transmitter Application circuit example
Description:
This example shows a BRAVO module
configured as a transmitter with all 8 inputs connected and watchdog disabled.
Notes:
All input switches would need to be connected to GND to activate.
DS-BRAVO-1
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BRAVO Telemetry Module
BRAVO Configured as a RECEIVER
1.
Operation
When configured as a receiver the BRAVO module will remain in a low power listening mode.
When a valid packet is received it will wake and action any output state changes required.
2.
Watchdog enabled
If “watchdog” is enabled the BRAVO-Rx will await a signal from a paired BRAVO-Tx
module. When the Watchdog signal is received OK then the watchdog output will be main-
tained active high.
If no watchdog signal is received in any 30minute period then the BRAVO-Rx
will drop the Watchdog output.
NOTE:
NOTE watchdog must be enabled on BOTH Tx and Rx for it to work.
Digital outputs
Active high LVCMOS / LVTTL compatible outputs. Can be connected directly to CMOS/ TTL
logic or drive.
Receiver example application circuit
Description:
This example shows a BRAVO module configured as a receiver with all 8 outputs connected
and watchdog disabled.
Note: The external learn switch and LED are also not fitted in this example.
Optional external learn switch and LED example circuit
DS-BRAVO-1
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BRAVO Telemetry Module
Bravo-
Bravo-
Pairing Process Bravo-Tx to Bravo-RX
Each BRAVO module has a unique serial number identity. They may be paired together using
the LEARN button/input so that they operate in systems in: one:one, one:many and many:one
formats. Each BRAVO-Rx can store 70 BRAVO-Tx identities.
Note: “watchdog” should not be enabled for many to one systems
3.1
Pairing process: Learn:
1.
Briefly press the “LEARN” switch (or activate LEARN input) on the BRAVO-Rx
2.
Briefly activate any input on the BRAVO-Tx
Paring process: Erase
1.
Press and Hold ‘LEARN’ switch (input) on the receiver for more than 10seconds.
3.2
LED indication of the pairing process is given by:
Mode
LED
Flickering ON
Description
Module is transmitting or receiving data
No RF data is being transmitted/received
BRAVO-RX Learn button pressed: module is
searching for another to pair with.
Learn mode times out after 10 seconds
BRAVO-Rx pairing successful
Normal operation
OFF
Flashing at low
speed
Flashing at high
speed for 3secs
Learn mode
(BRAVO-Rx only)
DS-BRAVO-1
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