User's Manual

USER MANUAL
BTX Ankle Tether
2.1 O FF S TATE
The Off state is designed to be the lowest power state for the BTX Ankle Tether. In this
state, the device will NOT report any status conditions to the TRU cell phone.
The Off state is entered when a new battery is inserted and the power is applied or when
instructed to enter the state by the TRU cell phone while in the On state.
When the state is entered, the device will (re-)initialize the hardware, setup a wakeup
interrupt for the START button, and go into the Super Low Power mode.
If the START button is pressed, the BTX will wake and wait for communication with the
TRU cell phone.
If the TRU cell phone pairs with the BTX Ankle Tether, the TRU cell phone will send the
wakeup command and the device will enter the On state.
If the TRU cell phone is not present or does not pair with the BTX Ankle Tether, the BTX
will timeout and go into the BTX’s lowest power state and wait for another START button
press.
2.2 O N S TATE
The On state is the normal state for a working BTX Ankle Tether. In this state, the
device will report any status conditions to the TRU cell phone over the communication
link per its configured settings and can be configured by the TRU cell phone.
The On state is entered when the device detects a START button press and the TRU cell
phone application has paired with the device and sent the wakeup command.
Once in the On state, the TRU can configure the BTX Ankle Tether by issuing
configuration commands and will receive fault status at predetermined intervals.
The On state is exited by: an Off command issued by the TRU cell phone or a low battery
condition that prevents the operation of the device.
In the On state, the device will monitor the following status conditions: strap conductive
link, strap optical link, battery voltage, and the START button and will report the status of
these conditions to the TRU cell phone.
Upon entering the state, the default configuration is set and the BTX updates the status and
sends the status to the TRU. The TRU will respond with a status acknowledge or with
another command indicating it wants to configure the device.
The command is interpreted and the appropriate action is completed, followed by the
device sending a command acknowledgement. The BTX Ankle Tether will accept other
configuration commands until there is no activity for the UART timeout period.
Once configuration is complete, the BTX will set the monitor timeout and wait.
When the monitor timeout has elapsed, the BTX will wake and get the device status.
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