ZULU T
Smart Radio Telemetry Module
Features
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10 Channel Transceiver Module
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Range up to 2,000 Metres
10 Digital Input / Outputs
2 Analogue Inputs (10bit), Outputs (PWM)
Receiver Outputs Follow Transmitter Inputs
Minimal external components
Direct Led Drive Shows Data Reception
Secure Data Protocol (auto Acknowledge)
Ultra Low Power 1.8—3.6V Operation
CE Compliant for Licence Free Use
Easy Pairing Process
One to One operation
868MHz Operating Frequency
100mW Transmit Power
Small Form Factor
Applications
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Remote Control
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Remote Networking
Remote Switching
Remote Traffic Lights
The ZULU-T Telemetry Module provides a reliable Transceiver based
industrial Remote Switch with up to 2,000 metres range. Two
modules are combined to provide a simple network of radio switch-
ing.
Each unit is supplied ready to operate, once paired with another
Module a remote control system is created
Connections for Power, antenna and Input / Output are the only
connections required
Part No
ZULU-T868
ZULU-T868-SO
Description
Radio Telemetry Module DIP Package
Radio Telemetry Module SMT Package
DS-ZULUT-2
ZULU Telemetry
Pin out
Pin Description
Pin No
1
2, 15
3
4-5
6, 8-11, 25
-27
7, 21-22
12
13
14
16
17, 18
19
Pr
im
el
Direction
In
In
In
In / Out
In / Out
In
In
Out
In
Out
In
In
In
In / Out
In
Name
ANT
GND
Description
Antenna Input / Output 50ohm Impedance
Connect to ground
in
Analogue /
Digital
I/O1-2
I/O 3-10
Connect to Vcc = I/O1-2 are analogue
Connect to GND = I/O1-2 are digital
Analogue or digital I/Os 0—Vcc,
connect to GND if unused
When configured as transmitter:
Digital inputs: high Impedance inputs
When configured as receiver:
Digital outputs: LVCMOS output drive
y
ar
NC
Reset
Watchdog
Error LED
Vcc
TX/RX
LEDs
TX/RX
Leave unconnected
Resets module operation, pull high for ordinary use.
Connect to Vcc = Turns OFF “watchdog”
Connect to GND = Turns ON “watchdog”
LED drive output. Flashes if Zulu Tx has not received
acknowledgment or Zulu Rx not received watchdog.
Supply voltage
Active LED output when module is transmitting or
receiving RF data packets.
Connect to Vcc = Module is a Transmitter
Connect to GND = Module is a Receiver
20
Ch Sel
Sets the channel frequency
Connect to Vcc = Operates on ch A 869.500
Connect to GND = Operates on ch B 868.133
Connect to momentary switch to GND, when activated plac-
es the module into pairing mode.
Connect together to enable RF interrupts on chip
(mandatory).
Connect 30MHz XTAL here to drive RF circuit
ta
Da
23
24, 28
29-30
Learn
IRQ In/Out
XTAL1-2
DS-ZULUT-1
ZULU Telemetry
General Description of Operation
Each module can be set to act as a ‘ Transmitter’ or ‘Receiver’ A remote telemetry system is
achieved when two modules are paired together, as transmitter (ZuluTx) and receiver (ZuluRx).
Each time an input changes on the ZuluTx, it will transmit the status of its inputs to the
paired ZuluRx(s). which will set its outputs to follow the ZuluTx Inputs and reply back with an
acknowledge signal. Once completed the modules will then go into sleep mode
Pin Descriptions:
Channel Select (pin 20)
This sets the operating carrier frequency of the module. This enables separate groups of mod-
ules to coexist in the same vicinity without any interference. For operation see page 2.
TX / RX (pin 19)
When connected to Vcc Zulu is a Transmitter
When connected to GND Zulu is a Receiver
XTAL1, XTAL2 (pins 29, 30)
The Zulu module requires a 30MHz drive crystal to be connected between XTAL1-2
Any standard crystal +/-10ppm ~20pF such as Farnell part no. 184-2247. Note tuning ca-
pacitors are not required.
Learn / Erase (pin 23)
Each transmitter has a unique identity. A receiver can ‘sync’ with a transmitter so that the
receiver outputs will respond to the transmitter inputs.
To Learn:
1.
Briefly press the “sync” switch on the receiver
2.
Briefly operate any of the transmitter inputs
To Erase
1.
Hold pin 7 on the receiver to ground for >10seconds.
2.
(For completed circuit press learn switch for 10sec)
3.
Indication of the process is shown the TX/RX LED.
Tx / Rx LEDs (pins 17, 18)
Direct LED drive which operate whenever there is RF activity Tx or Rx
Mode
Normal operation
Learn mode
Pr
im
el
TX/Rx LED
ON
OFF
Flashing at low
speed
Flashing at high
speed 3secs
in
y
ar
Description
Module is transmitting/receiving RF data
No RF data is being transmitted/received
Module is searching for another to pair with.
Pairing successful
ta
Da
DS-ZULUT-1
ZULU Telemetry
The following descriptions apply to the Zulu Module in TRANSMITTER Mode
When configured as a Transmitter the ZULU Module will automatically default to low power
sleep mode until any input state change takes place.
On receipt of an input state change the ZuluTx will transmit a packet showing the status of
all inputs (multiple state changes can take place simultaneously).
The ZuluTx will remain “awake” until:
1.
The paired ZULU Rx Module has acknowledged, or
2.
A timeout value of 4 retry transmissions. (Pin 26 output will then be flashed)
Analogue / Digital (pin 3)
This input configures Input 1-2 to be analogue or Digital inputs. Analogue is enabled when pin
is HIGH.
Note: this input is read at power up only.
Analogue Inputs (4,5)
If enabled each input is 10bit A/D which can accept a voltage between 0 –Vcc.
Each input is sampled ten times per second, and the value is averaged before transmission.
ZuluTx will transmit whenever there is a change in the detected input voltage of 0.025V
If no change of voltage is measured then the ZuluTx will not transmit. A nominal 1uF capacitor
is recommended across the analogue inputs in order to prevent noise being read and transmit-
ted.
Note: A maximum of three RF packets are sent per second.
Digital Inputs
High Impedance Inputs, LVCMOS / LVTTL compatible.
Can be connected directly to CMOS/TTL logic or switch inputs connected to 0V (active low)
A change on the input will cause the ZuluTx to wake, read the inputs and initiate RF
transmission.
Watchdog Input (pin 13)
The watchdog is designed to enable the ZuluRx to be aware of any potential problems with the
RF link to a sync’ed ZuluTx.
When activated the ZuluTx will automatically transmit a call in packet a regular basis every
10seconds. Input statuses are not sent as part of the watchdog signal.
Note: This pin is only read on power up. Watchdog is only valid on a 1-1 system.
RF Fault (pin 26)
Direct drive to LED. Each time the ZuluTx transmits the status of its inputs, it expects an
acknowledgement from the paired receiver. If this is received then the RF Fault LED is not
used. If no acknowledgement is received RF Fault is flashed.
RF Fault LED Status
OFF
Flashing at 1Hz
Pr
im
el
in
Receiver has acknowledged correctly
No acknowledgment received
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ar
Description
ta
Da
DS-ZULUT-1
ZULU Telemetry
Transmitter example application circuit
Vcc
ANT
GND
3
4
5
6
7
8
9
30
29
28
27
26
25
ZULU-T
24
23
22
21
20
19
18
17
RX LED
TX LED
NC
NC
NC
Vcc
XTAL
Analogue Inputs
SWITCH INPUTS 3 - 7
Notes:
Watchdog is ON
Channel selected is 869.500
Analogue inputs active
Pr
NC
Vcc
10K
RF Fault
Vcc
im
el
10
11
12
13
14
15
Vcc 16
in
y
ar
SWITCH INPUTS 8 - 10
ta
Da
DS-ZULUT-1
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