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 c/-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
TX/Rx LED
Description
Normal operation
ON
Module is transmitting/receiving RF data
OFF
No RF data is being transmitted/received
Learn mode
Flashing at low
speed
Module is searching for another to pair with.
Flashing at high
speed 3secs Pairing successful
