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.
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
Description
OFF
Receiver has acknowledged correctly
Flashing at 1Hz
No acknowledgment received
