• The radio uses a 3D accelerometer to determine the direction of the gravity’s 1 g
downward acceleration. The direction of this force is averaged during the
“learning” time.
• Once trained, the gravity component of the acceleration is removed, leaving only
movement, impacts and mis-orientation acceleration to be sensed.
• User movement is monitored for the normal patterns of acceleration associated
with the walking movement.
• Mis-orientation is indicated by the gravity force not being cancelled by the
“trained” counter-force.
• Falls, impacts and other unexpected trauma can be sensed by sudden
accelerations that exceed the force of gravity.
• If any of these events occur, the Man Down audible alert is triggered.
• The user has the set time to cancel the alert or the radio will enter the emergency
alarm mode (see Alarm).
• Then the Man Down system uses the radio’s emergency automatic voice
transmission sequencer, programmed by the Alarm settings, to monitor the audio
at the scene of the incident.
8.13. LONE WORKER
Lone Worker is used to initiate emergency alarm mode when the user is unresponsive
after a predetermined time. A data message is also sent to the device management
software (via the gateway) indicating that the worker may be incapacitated.
The Lone Worker countdown is reset after any user activity with the radio, i.e. either
PTT or “Lone Worker” buttons are pressed.
8.14. DMR ALL CALL DIAL STRING
This function is used as a short sequence of key presses for “All Call” dial string
(******#). In order to initiate All Call, the user should press PTT within 5 seconds after
“DMR All Call” button is pressed.
Doc Number:
TNM-U-E-0114 ISSUE 1.4
Page
70
