Users Manual

https://www.lairdconnect.com/iot-devices/iot-
sensors/sentrius-bt7x0-tracker-multi-sensor
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Figure 3 – BLE operations in Active mode
When in Active mode, the tracker sequences through a series of BLE operations continuously including Scan, Advertise, and
Connected. The Scan Interval parameter determines how much time passes between scan events, at which point the tracker
awakes from sleep and performs a BLE scan (discovery of other trackers) for a number of seconds defined by the Scan
Duration parameter.
When not connected, the tracker advertises (transmits) data for other trackers to receive when scanning. The rate of transmit
events when performing the Advertise operation is determined by the Ad Interval parameter.
The advertisement data contains identifiers to help filter out non-tracker devices, including device ID, TX power, and other
status information. Flags in the advertisement can be used by gateway devices to determine when a tracker has log data
ready for download.
The pre-production tracker hardware provides a multi-color status LED for detailed operating behavior to the user. The
following table (Table 1) describes the LED patterns used to indicate status. Note the blue LED illuminates very weakly as
battery level drops.
Table 1: Pre-production tracker hardware LEDs
LED
Status LED Behavior
Description
Pulsing blue
BLE scanning in progress
Pulsing cyan
Non-Active mode
Pulsing white
Power-Save mode or Alarm Snooze
Flashing yellow
Tracker clock is not set, connect to mobile app to set it
Flashing orange
Low battery
The production tracker hardware uses a red/green status LED to indicate operating behavior to the user. The following table
(Table 2) describes the LED patterns used to indicate status.
Table 2: Production hardware LEDs
LED
Status LED Behavior
Description
Flashing yellow
Tracker clock is not set, connect to mobile app to automatically set it
Flashing orange
Low battery