Laird BT710 Sentrius Digital Contact Tracing Sensor User Guide

User Guide for Laird models including: BT710, Sentrius, Digital Contact Tracing Sensor, BT710 Sentrius Digital Contact Tracing Sensor, Tracing Sensor
Ben Whitten

Version 2.0 - m2m Germany

It's available from BT710 series product page or from the following link: ... When in Active mode, the tracer sequences through a series of BLE operations ...
Version 2 - m2mGermany

File Info : application/pdf, 18 Pages, 1.14MB
5144 CS-GUIDE-BT710 v2 0
A
TM
Version 2.0

Version 1.0
2.0

Date 10 Dec 2020
21 Feb 2021

Notes Initial release Transferred detailed regulatory information to a separate document

Contributor Scott Lederer
Sue White

Approver Chris Boorman
Jonathan Kaye

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1 About this Guide ..................................................................................................................................................................4 2 Introduction..........................................................................................................................................................................4
2.1 Product Overview.......................................................................................................................................................4 2.2 Specifications .............................................................................................................................................................4 3 Device Operation.................................................................................................................................................................5 3.1 Activating the Tracer ..................................................................................................................................................5 3.2 Battery Check.............................................................................................................................................................5 3.3 Factory Reset.............................................................................................................................................................5 3.4 Replacing Batteries ....................................................................................................................................................5 3.5 Active Mode Operation...............................................................................................................................................6 3.6 LED Blink Patterns .....................................................................................................................................................6 3.7 Alarm Ranges ............................................................................................................................................................7 3.8 Alarm Styles ...............................................................................................................................................................7 3.9 Care and Maintenance ...............................................................................................................................................7 4 Contact Tracer Architecture.................................................................................................................................................8 4.1 Bluetooth Advertisements ..........................................................................................................................................8 4.2 Bluetooth Advertisement Field Details........................................................................................................................9
4.2.1 Company ID Field.................................................................................................................................................9 4.2.2 Protocol ID Field...................................................................................................................................................9 4.2.3 Network ID Field...................................................................................................................................................9 4.2.4 Flags Field............................................................................................................................................................9 4.2.5 Device ID Field .....................................................................................................................................................9 4.2.6 Ad Record Type and Ad Record Data Fields........................................................................................................9 4.3 Tracer Configuration................................................................................................................................................. 10 4.4 Parameter Selection Considerations ........................................................................................................................12 4.5 Firmware Updates .................................................................................................................................................... 12 4.6 Proximity Alarms ...................................................................................................................................................... 12 4.7 Data Logging ............................................................................................................................................................ 14 5 Mobile Application ............................................................................................................................................................. 15 5.1 Overview .................................................................................................................................................................. 15 5.2 Using the SentriusTM BT710 Mobile App .................................................................................................................. 15 6 Regulatory ......................................................................................................................................................................... 16 7 Ordering Information..........................................................................................................................................................16 8 Label Info...........................................................................................................................................................................17 9 Frequently Asked Questions.............................................................................................................................................. 18 10 Additional Assistance ........................................................................................................................................................ 18

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This document provides a comprehensive guide on how to configure the SentriusTM BT710 Contact Tracer functionality, including Bluetooth parameters, alert parameters, and general use for proximity sensing applications.

The SentriusTM BT710 Contact Tracer or "tag" is a battery powered, Bluetooth v5 integrated sensing and contact tracing platform enabling tag-to-tag proximity sensing and logging along with tag-togateway communication for log upload. It contains several local alarm peripherals including four bright red LEDs, a bi-color status LED, an audible speaker, and a vibration motor (on wrist-worn
models). For proximity sensing applications where local alarm indication is desired, the BT710 offers several user-configurable options to suit the use case. The BT710 is powered by Laird Connectivity's field proven BL653 BLE module that integrates Nordic Semiconductor's nRF52833 SoC silicon.

1

4

4 2 3

4

5

1. Clasp 2. Status LED 3. Speaker 4. Alarm LEDs 5. Pushbutton

4
Figure 1: Top of the SentriusTM BT710
Note: Laird Connectivity has a comprehensive staff of design services engineers available to help customize the tracer. Please contact your local Laird Connectivity sales representative for more details.

See the BT710 product brief for detailed specifications. It's available from BT710 series product page or from the following link: https://www.lairdconnect.com/documentation/product-brief-bt7x0-contact-tracer

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The SentriusTM BT710 is shipped with the battery installed and operating in a low power state called Shipment Mode.
When it arrives from the factory, the tracer is in shipment mode. To wake the device, press and hold the pushbutton for five seconds until the alarm LEDs turn on and a speaker tone is emitted along with the status LED lighting green and a brief vibration for devices equipped with that feature (startup sequence). This puts the tracer into Active Mode. The tracer blinks the status LED yellow waiting for its internal clock to be set, either by the BT710 mobile app or a nearby gateway. If a gateway is not available, connect the mobile app to automatically set the internal clock. Once in active mode with its clock set, the BT710 scans for compatible nearby tracers and transmits BLE advertisements for other tracers to sense.
In active mode, the BT710 tracer can be configured using the associated Laird Connectivity BT710 mobile application. The default configuration sets the tracer to periodically scan for and log other tracers. Additional parameters include BLE advertising interval, RSSI sensing/proximity thresholds, proximity alarm timers, and alarm indicator styles.
There are two low power modes: Non-Active and Power-Save. The tracer automatically enters these modes based on motion detection to extend battery life. User-configurable parameters control timing for this feature. Separate BLE scanning parameters can be set for each operating mode to scan less frequently in Non-Active mode and Power-Save mode. The timeouts for entry into the low power modes is also adjustable on the settings tab of the app.

Figure 2 - Operating modes of the BT710 Tracer

Press and hold the pushbutton for three seconds to perform a battery check. The BT710 lights up a number of its red alarm LEDs to indicate approximate voltage level of the battery.
4 LEDs on: 75-100% battery life remaining 3 LEDs on: 50-75% battery life remaining 2 LEDs on: 25-50% battery life remaining 1 LED on: 0-25% battery life remaining
When the BT710 senses a battery below the low battery threshold parameter, it blinks the status LED quickly three times red at each scan interval. A small beep sequence is also emitted occasionally as a reminder to change the battery.

If the button is held for more than 10 seconds, the status LED begins to rapidly blink yellow. Releasing the button performs a factory reset. A factory reset erases all logs and resets all parameters to defaults. The BT710 goes through a reset cycle when finished and emits the startup sequence LED pattern and beeps, followed by entry into active mode.

The battery is a 3-volt lithium of CR2477 type.
Note: The battery door cover is underneath the clasp on the backside of the contact tracer. A coin may be used to aid in removal.

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Figure 3  BLE operations in Active mode
When in Active mode, the tracer 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 tracer awakes from sleep and performs a BLE scan (discovery of other tracers) for a number of seconds defined by the Scan Duration parameter. At each scan interval, the status LED blinks to indicate the tag is scanning (see the LED Patterns section for details on LED blink patterns).
When not connected, the tracer advertises (transmits) data for other tracers 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-tracer devices, including device ID, TX power, and other status information. Flags in the advertisement indicate to gateway devices when a tracer has log data ready for download.

The tracer hardware uses a red/green status LED to indicate operating behavior to the user. The following table (Table 1) describes the LED patterns used to indicate status.

Table 1: Status LED Blink Patterns

LED

Status LED Behavior

Slow flashing yellow

Fast flashing yellow

Green on startup

Description
Internal clock is not set, connect to mobile app or bring the tag near a gateway to automatically set it
When holding the button for 10+ seconds, fast yellow flash indicates release of the button will perform a factory reset
The status LED shows green briefly as part of the startup sequence indicating the tag is running BT710 tracer firmware

Fast flash green

Green flash indicates the tag is scanning for presence of nearby tags

Three green flashes Three quick green flashes indicates the data log is full

Three red flashes

Three quick red flashes indicates the battery is low

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The tracer is equipped to trigger alarms at one of 3 distances from other tracers. These ranges are referred to as Range A, Range B, and Range C. Each range has its own configurable RSSI threshold, providing flexibility to trigger different alarm indicators depending on distance from remote tracers. Using the BT710 mobile app interface, tap and drag the letter corresponding to the range to adjust, then fill in corresponding fields below to setup the alarm configuration. Alarm 1 and Alarm 2 options allow setting different alarm indicators based on the amount of time a remote tracer has been within the specified RSSI range.
The ranges are limited to be at least 4dBm apart from each other. The minimum range is -30 dBm (only Range A can be set to this value, due to the 4dBm range threshold difference). The maximum alarm range is -95 (only Range C can be set to this value, due to the 4dBm range threshold difference).

Several indicator styles are available providing control over how alarm LEDs, audible tones, and vibration motor feedback are activated when an alarm is triggered. These styles are configurable using the Alarms tab of the BT710 mobile application. When configuring the alarm style, the BT710 mobile application will trigger the new alarm style on the BT710 tracer to show the new alarm style (note, "Save Changes" must still be pressed in order to apply the new alarm style).
Alarms are defined both by duration of proximity (Alarm 1 vs. Alarm 2) and by signal strength (RSSI) of each remote tag. Indicator styles may be selected independently for Alarm 1 and Alarm 2 conditions. The following table (Table 2) describes the styles available for each alarm indicator.

Table 2: Alarm indicator styles

Indicator

Style

Red Alarm LEDs

Off

Style 1

Style 2

Style 3

Style 4

Speaker Indicator

Off

Style 1

Style 2

Style 3

Style 4

Vibe Indicator

Off

Style 1

Style 2

Style 3

Style 4

Alarm Intensity

Low

High

Description/Pattern Red Alarm LEDs remain off LEDs are lit in a clockwise pattern All red LEDs blink in unison Top/bottom fast blink; left/right fast blink Left/right fast sweep of red LEDs No tones are emitted by the speaker Three fast chirps Three buzzer tones Two double-beep tones Four bright tones, repeated two times No vibration will be triggered by the vibration motor One long vibration Two vibrations Several short-pulsed vibrations One long ripple vibration Lowers intensity of speaker and vibration indicators Normal intensity of speaker and vibration indicators

The tracer can be cleaned with a mild, non-abrasive detergent. The tracer is not IP-rated/waterproof, so do not immerse it in water or cleaning fluids.
The tracer does not require any calibration.

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The SentriusTM BT710 advertises an identifying beacon used by other nearby BT710 contact tracers and gateways to log proximity to the tracer. This advertisement includes information such as a user configurable device identifier, a hardware identifier, and current status of the Bluetooth contact tracer. You can configure a tracer using a Bluetooth connection and the Laird Connectivity SentriusTM BT710 mobile application.
The following tables describe the data available in the advertisements of the BT710 tracer. Once a tracer is configured, it is possible for a mobile app or gateway to connect to the BT710 device for configuration of parameters and/or data log download. The BT710 device can be configured to transmit with an output power of -20 to +8 dBm.

Table 3: 1M PHY Byte

Description

0

0x02

1

GAP_ADTYPE_FLAGS

2

GAP_ADTYPE_FLAGS_BREDR_NOT_SUPPORTED

3

0x1b (27)

4

GAP_ADTYPE_MANUFACTURER_SPECIFIC

5

Company ID 1

6

Company ID 2

7

Protocol ID LSB

8

Protocol ID MSB

9

Network ID LSB

10

Network ID MSB

11

Flags LSB

12

Flags MSB

13-18

Device ID

19

Ad Record Type

20-30

Ad Record Data

Value/Notes Length (0x02) Type (0x01)
Data Length (length is not included in overall length)
0xFF (Type) 0x77 (Laird)
0x00 0x81 (Identifies the advertisement format)
0xFF Assigned during configuration. Default is 0xFFFF
This can be used for filtering advertisements Indicate the current state of the system See: 4.1.4 Flags
Random static Bluetooth address (0 is LSB) See: 4.1.3 Ad Record Types
Determined by value of Ad Record Type above

Table 4: 1M PHY scan response

Byte

Description

0

DEVICE_NAME

1-11

Device name, e.g. BT710-AABB

Value/Notes 0x08 or 0x09 Max Complete Name (0x09) is 12 characters

Table 5: Advertisement record types

ID

Event

0x00

Tracking Ad

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Data
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Format
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This is always 0x0077, the Company ID for Laird Connectivity. This is always 0xFF81, the protocol for the BT510-CT and BT710 tracers. This is user programmable via the NETWORK_ID parameter. Defaults to 0xFFFF.

Table 6: Flags field Flag Bit
Bit 0 (0x0001) Bit 1 (0x0002) Bit 2 (0x0004) Bit 3 (0x0008) Bit 4 (0x0010)

Name HAS_EPOCH_TIME
HAS_LOG_DATA RESERVED
LOW_BATTERY DATALOG_FULL

Description 0 Clock time not set 1 Clock time set 0 Data log not ready 1 Data log ready for download 0 Reserved 1 Motion Reserved 0 Battery good 1 Battery low 0 Datalog is not full 1 Datalog is full

This is the device ID currently advertised by the BT710.

The Ad Record Type byte indicates the format of the remaining bytes to follow in the advertisement data (the Ad Record Data). The list of defined Ad Record Types and corresponding data format is displayed in the following table (Table 7).

Table 7: 0x10 - Ad Tracking Record

Field Name

Size (Bytes)

Profile

1

Epoch Time

4

TX Power

1

Motion

1

HW Model ID

1

Battery Voltage

1

Firmware Version

1

Data Type uint8 uint32 int8 uint8 uint8
uint8 uint8

Description User programmable device type category Time since a known reference point in seconds TX power setting of the radio (-40 to 8) 0: No motion present, 1: Motion present 0x00  BT510 0x10  BL654 DVK 0x20  BL653 DVK 0x30  BT710 0x40  MG100 0x50  IG60 Battery voltage divided by 16 (in millivolts) 4 MSB bits: Major version, 4 LSB bits: Minor version

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Field Name Firmware Build

Size (Bytes) 1

Data Type uint8

Description Build version

The tracer has several parameters that can be used to tailor it for each use case.
The table below lists the common parameters that can be adjusted by the user based on the use case the tracer is being applied to. These parameters can be updated using the BT710 mobile application.

Parameter Name General Settings Tx Power Low Battery Threshold Distance Filter
Antenna Option
Active Scan Interval Active Scan Duration Active Ad Interval Active Motion Timeout Non-Active Scan Interval Non-Active Scan Duration Non-Active Ad Interval
Non-Active Motion Timeout
Non-Active Motion Detect Power Save Scan Interval Power Save Scan Duration Power Save Ad Interval Power Save Motion Detect Logging Profile Network ID
Log Interval
Contact Period Discovery Duration Tracking Duration Logging Threshold Alarms RANGE A

Default Value Description

+8 dBm 2600 mV
1 Ant 1 TX, Both
RX 10 sec 2 sec 250 ms 300000 ms 120 sec 2 sec 500 ms
600000 ms
500 ms 3600 sec
1 sec 1000 ms 500 ms

Transmit power of BLE radio (-20dBm to +8dBm) Voltage level triggering a low battery indication RSSI filter selection (0: none, 1: average)
Select how antennas are used for transmit (TX) and receive (RX)
Seconds between scan/discovery events (Active Mode) How long to scan for/discover nearby tracers (Active Mode) Milliseconds between advertisement TX events (Active Mode) Milliseconds of no motion to trigger "Non-Active Mode" from "Active Mode" Seconds between scan/discovery events (Non-Active Mode) How long to scan for/discover nearby tracers (Non-Active Mode) Milliseconds between advertisement TX events (Non-Active Mode) Milliseconds of no motion to trigger "Power-Save Mode" from "Non-Active Mode" Milliseconds of motion to wake from "Non-Active Mode" Seconds between scan/discoveryevents (Power-Save Mode) How long to scan for/discover nearby tracers (Power-Save Mode) Milliseconds between advertisement TX events (Power-Save Mode) Milliseconds of motion to wake from "Power-Save Mode"

0 65535
2 min
86400 sec 300 sec 1800 sec - 99 dBm

User assignable value for categorizing tracer types Network identifier for grouping tracers and gateways How often data log is available for download (if present). Datalogging and data collection is disabled if this value is set to 0. Period being monitored for a contact event Time a tracer must be observed before logging to storage Maximum log time for each tracer per contact period Tracers with RSSI value less than this threshold will be ignored

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Parameter Name Range A Proximity Alarm 1 Timer Range A Alarm 1 RSSI Threshold Range A Alarm 1 Red LED Indicator Range A Alarm 1 Speaker Indicator Range A Alarm 1 Vibe Indicator Range A Alarm Intensity Range A Proximity Alarm 2 Range A Alarm 2 Red LED Indicator Range A Alarm 2 Speaker Indicator Range A Alarm 2 Indicator Styles Range A Alarm 2 Intensity RANGE B Range B Proximity Alarm 1 Timer Range B Alarm 1 RSSI Threshold Range B Alarm 1 Red LED Indicator Range B Alarm 1 Speaker Indicator Range B Alarm 1 Vibe Indicator Range B Alarm Intensity Range B Proximity Alarm 2 Range B Alarm 2 Red LED Indicator Range B Alarm 2 Speaker Indicator Range B Alarm 2 Indicator Styles Range B Alarm 2 Intensity RANGE C Range C Proximity Alarm 1 Timer Range A Alarm 1 RSSI Threshold Range C Alarm 1 Red LED Indicator Range C Alarm 1 Speaker Indicator Range C Alarm 1 Vibe Indicator Range C Alarm Intensity

Default Value 3 sec
-52 dBm

Description Seconds of proximity to a remote tracer before triggering alarm 1 Trigger alarm if a tracer is detected with signal greater than this value

Style 1

Selects style for the red LED indicators when alarm 1 is triggered

Style 4
Off High 600 sec Style 1

Selects style for the speaker indicator when alarm 1 is triggered
Selects style for the vibration motor indicator when alarm 1 is triggered Normal intensity speaker/vibe indicator level Seconds of proximity to a remote tracer before triggering alarm 2 Selects style for the red LED indicators when alarm 2 is triggered

Style 1 Style 4
Low

Selects style for the speaker indicator when alarm 2 is triggered Selects style for the vibration motor indicator when alarm 2 is triggered Low intensity speaker/vibe indicator level

3 sec -60 dBm Style 3
Off Off High 600 sec Style 3
Style 3 Off Low

Seconds of proximity to a remote tracer before triggering alarm 1 Trigger alarm if a tracer is detected with signal greater than this value Selects style for the red LED indicators when alarm 1 is triggered
Selects style for the speaker indicator when alarm 1 is triggered Selects style for the vibration motor indicator when alarm 1 is triggered Normal intensity speaker/vibe indicator level Seconds of proximity to a remote tracer before triggering alarm 2 Selects style for the red LED indicators when alarm 2 is triggered
Selects style for the speaker indicator when alarm 2 is triggered Selects style for the vibration motor indicator when alarm 2 is triggered Low intensity speaker/vibe indicator level

3 sec -71 dBm
Off
Off Off High

Seconds of proximity to a remote tracer before triggering alarm 1 Trigger alarm if a tracer is detected with signal greater than this value Selects style for the red LED indicators when alarm 1 is triggered
Selects style for the speaker indicator when alarm 1 is triggered Selects style for the vibration motor indicator when alarm 1 is triggered Normal intensity speaker/vibe indicator level

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Parameter Name Range C Proximity Alarm 2 Range C Alarm 2 Red LED Indicator Range C Alarm 2 Speaker Indicator Range C Alarm 2 Indicator Styles Range C Alarm 2 Intensity

Default Value 600 sec

Description Seconds of proximity to a remote tracer before triggering alarm 2

Off

Selects style for the red LED indicators when alarm 2 is triggered

Off Off High

Selects style for the speaker indicator when alarm 2 is triggered Selects style for the vibration motor indicator when alarm 2 is triggered Low intensity speaker/vibe indicator level

The parameters provide flexibility in configuration of timing and operation of the tracer for different use cases. For example, a fixed location asset tracker may be suited to scanning less often than a mobile tracer.
The configuration parameters affect how often the tracer operates in each mode and therefore have a direct impact on responsiveness/latency of the log entries and battery life of the device. These parameters must be considered carefully for the log data to serve the purpose of a specific tracking application.
The highest power usage occurs when the tracer is scanning/discovering other tracers. In this mode, the device is both transmitting its BLE advertisements and has the radio receiver turned on to discover nearby tracers for logging. The defaults target use cases where batteries are changed about once a month. If more time is necessary, the scan interval can be increased (scan less frequently), the scan duration can be decreased (scan for a shorter time period), or the advertising interval can be adjusted to keep the radio in sleep mode more often, thus extending useful battery life. TX power is also a consideration as higher power settings reduce battery life.

Note:

Scan interval, scan duration, and ad interval can be set separately for Active mode, Non-Active mode, and PowerSave mode. By increasing the scan interval and reducing the scan duration and ad interval during Non-Active mode and Power-Save mode, the tracer can conserve battery life when motion is not detected. For best power savings, set Power-Save mode scan duration to a value of zero to keep from scanning altogether when the tracer has been idle (no motion) for an extended period.

The BT710 Contact Tracer supports over-the-air (OTA) firmware updates when paired with an appropriate Laird Connectivity mobile application or supporting gateway product. The process uses a standard DFU mechanism that can be incorporated into customer apps/products for compatibility. For more details regarding integration into your own tracking solution, please contact the Laird Connectivity sales team member for your region.
The tracer implements programmable alarms that can be used to trigger local audio, visual, and haptic indicators when a remote tracer is detected within an RSSI range for a configured amount of time. Each alarm has a parameter indicating the number of seconds a remote tracer must be detected before triggering the alarm indicators and a corresponding RSSI threshold.
Each scan interval, the tracer determines which tracers are within proximity and meet the configured RSSI threshold to begin logging. A counter increases each time that same tracer is observed in a scan. Once [the number of scan intervals a tracer is detected] x [Scan Interval parameter] is equal or greater than the configured alarm timer, the alarm indicators are triggered for each subsequent scan that tracer is detected until the configured contact period expires or the remote tracer moves out of proximity.
The following diagram (Figure 4) shows the proximity alarm timeline given default parameter values.

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Proximity Alarm Timeline for Each Remote Tracker Starts on First Detection

Proximity Alarm 1 Triggers Each Scan While Proximity Detected

REMOTE TRACKER DETECTED IN SCAN

Proximity Alarm 2 Triggers Each Scan Still Detected

No Alarm if Not Detected in Scan

Proximity Alarm Timeline Restarts After
Every Contact Period

TIME (SECONDS) 0

10

20

30

40

50

60

70

80

90 100 110 590 600 610 620 630 640 650 86,390 86,400

Scan Duration 2 Seconds

Scan Interval 10 Seconds

Proximity Alarm 1 3 Seconds

Proximity Alarm 2 600 Seconds

Figure 4 - Proximity alarm timeline

Contact Period 86,400 Seconds (1 Day)

As a tracer detects other remote tracers ("remotes") in a BLE scan, each remote enters into a RAM-based discovery database in order to track the number of scan intervals each is seen for alarming purposes. Each remote has its own timeline from the perspective of the sensing tracer.
Each time a remote is detected in a BLE scan, a count of seconds is added to that remote's total detection time in the database. This number of seconds is equal to the Active Scan Interval parameter. If a remote is not detected in a scan, the total detection time in its database entry is not incremented for that scan interval. For example, with default parameters, each scan interval a remote is detected adds 10 seconds to its total detection time in the database.
After any remote is detected in enough scans such that total detection time crosses a configured alarm threshold, the configured alarm indicators are triggered to alert the user. The alarm continues to trigger each scan interval until no remotes having total detection time longer than the alarm time setting are within range.
Once "Contact Period" seconds passes since the first time a remote is detected, total detection time for that remote is reset to zero in the database, starting a new proximity alarm timeline once it is detected in a future scan.
Note that though alarms can be configured for different ranges (A, B and C), the closest proximity alarm takes priority, meaning if conditions for a range A alarm are met, the range B and range C alarms will not be triggered. Likewise, if a range B alarm condition is met, alarm C will not trigger.

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The BT710 is designed to log data from other compatible tracer devices it observes during its BLE scan operations. The logging functionality can be disabled through the Log Interval parameter (set Log Interval to 0).

The following diagram (Figure 5) shows the data logging timeline and how various parameters affect each logging phase.

Logging Timeline for Each Remote Tracker Starts on First Detection
(RAM-only Logging)

Tracking Phase Starts
(Flash-based Logging)

Untracked Phase Starts
(No Logs Recorded for This Remote
Tracker Until Next Contact Period)

Logging Timeline Resets After Contact Period Expires

DISCOVERY PHASE

TRACKING PHASE

UNTRACKED PHASE

REMOTE TRACKER DETECTED IN SCAN

TIME (SECONDS) 0

30

60

90 120 270 300 330 1770 1800 1830 1860 1890 1920 1950 86,370 86,400

Scan Duration 2 Seconds

Scan Interval 30 Seconds

Discovery Duration 300 Seconds

Tracking Duration 1800 Seconds

Figure 5 - Data logging timeline

Contact Period 86,400 Seconds (1 Day)

As a tracer detects remote tracers ("remotes") in each BLE scan, the discovery database is updated and the remote steps through three phases of logging throughout a single Contact Period.
 Discovery Phase  Remote tracers are tracked in a RAM-only discovery database for each scan they are detected. Once the total detection time is greater than the configured Discovery Duration, the records for the remote are committed to a Flash-based log and the remote enters Tracking Phase. If a remote is only detected fewer scan intervals than the configured Discovery Duration within a given Contact Period, the remote is not logged to Flash. This is useful for situations where tracers are in proximity for very brief periods of time and do not warrant storage to the Flash-based log. Discovery Phase stores a maximum of 10 records per remote before automatically moving into Tracking Phase.
 Tracking Phase  Remote tracers in the Tracking Phase get an additional record in the Flash-based log for every scan interval they are detected, up to the maximum records that can be recorded for the duration of the Tracking Phase (set with the Tracking Duration parameter).
 Untracked Phase  If a remote tracer has been detected for the entirety of the Tracking Phase, no more records are made for that remote until the Contact Period expires or that entry is collected by a gateway. This limits the maximum number of Flash log records that are used by a single remote per Contact Period, allowing remaining Flash space to be used for detection and logging of other remote devices during the Contact Period.

The number of unique remote tracers that can be logged is a function of the Scan Interval and Tracking Duration parameters. For example, with Scan Interval of 30 seconds, Tracking Duration of 15 minutes and Contact Period of 24 hours, up to 50 remote tracers can be logged for 1 week before the log is full. Once the log is full, the oldest entries are overwritten with new entries in first-in first-out order. The following data is logged at each scan interval from a remote tracer's advertisement:

Device ID

Timestamp

Status

RSSI

Motion Status TX Power

Figure 6 - Data logged for each remote tracer detected in BLE scans

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The SentriusTM BT710 mobile application allows a user to configure tracer parameters and update firmware. To use the SentriusTM BT710 mobile application, follow these steps:
1. From the applicable app store (Apple or Android) search for and install the SentriusTM BT710 mobile application on your mobile device.
2. To connect to the BT710, make sure it is in Active mode. 3. Tap FIND BT7 DEVICE to discover the tracer(s) within range of the mobile device.
Figure 7 - Scan for BT710 tracers 4. Select the tracer to connect. Tracer names start with BT710 and end with the last four digits of the BLE ID as printed on
the device QR code. Once connected, the app displays the current parameter values configured for the tracer. Parameters are grouped using tabs near the bottom of the page.

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Figure 8: Current parameter values

Note: For complete regulatory information, refer to the BT710 Regulatory Information document which is also available from the BT710 product page.

The BT710 holds current certifications in the following countries:
Country/Region USA (FCC) Canada (ISED) EU

Regulatory ID SQGBT710 3147A-BT710 N/A

Part Number 450-00122-K1 450-00134-K1 450-00122B 450-00059B 450-00134B-K1

Description SentriusTM BT710 Bluetooth Contact Tracer, with Clip, Single SentriusTM BT710 Bluetooth Contact Tracer, with Vibration, with Wrist Strap, Single SentriusTM BT710 Bluetooth Contact Tracer, with Clip, BULK SentriusTM BT710 Bluetooth Contact Tracer, BULK SentriusTM BT710 Bluetooth Contact Tracer, with Vibration, with Wrist Strap, BULK

Packaging Single (1) Single (1) Bulk (100) Bulk (100) Bulk (100)

https://www.lairdconnect.com/bt7x0-series

16 © Copyright 2021 Laird Connectivity, Inc.
All Rights Reserved

Americas: +1-800-492-2320 Europe: +44-1628-858-940 Hong Kong: +852 2923 0610

QR Code

QR Code

BLE ID marking is viewable with battery door removed

BLE ID marking is viewable with battery door removed
Figure 9-Laser Etching on BT710 Contact Tracers The QR Code contains the part number, hardware revision, date code, and BLE ID (ALL Caps) Example Readout: 450-00122;1;0920542;CB09AE5B8D7F

https://www.lairdconnect.com/bt7x0-series

17 © Copyright 2021 Laird Connectivity, Inc.
All Rights Reserved

Americas: +1-800-492-2320 Europe: +44-1628-858-940 Hong Kong: +852 2923 0610

Please refer to the support FAQs online which can be found here:- https://www.lairdconnect.com/support/faqs
Please contact your local sales representative or our support team for further assistance: Laird Connectivity Support Centre: https://www.lairdconnect.com/resources/support Email: wireless.support@lairdconnect.com Phone: Americas: +1-800-492-2320 Europe: +44-1628-858-940 Hong Kong: +852 2923 0610 Web: https://www.lairdconnect.com/iot-devices/iot-sensors/sentrius-bt710-contact-tracer-multi-sensor

© Copyright 2020 Laird Connectivity. All Rights Reserved. Any information furnished by Laird Connectivity and its agents is believed to be accurate and reliable. All specifications are subject to change without notice. Responsibility for the use and application of Laird Connectivity materials or products rests with the end user since Laird Connectivity and its agents cannot be aware of all potential uses. Laird Connectivity makes no warranties as to non-infringement nor as to the fitness, merchantability, or sustainability of any Laird Connectivity materials or products for any specific or general uses. Laird Connectivity or any of its affiliates or agents shall not be liable for incidental or consequential damages of any kind. All Laird Connectivity products are sold pursuant to the Laird Connectivity Terms and Conditions of Sale in effect from time to time, a copy of which will be furnished upon request. Other marks may be the property of third parties. Nothing herein provides a license under any Laird Connectivity or any third-party intellectual property right.

https://www.lairdconnect.com/bt7x0-series

18 © Copyright 2021 Laird Connectivity, Inc.
All Rights Reserved

Americas: +1-800-492-2320 Europe: +44-1628-858-940 Hong Kong: +852 2923 0610
References

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