TEKTELIC Communications Kona T0004895, Техническое справочное руководство

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Kona LoRa IoT Home Sensor TRM T0005370_TRM Version 1.2
TEKTELIC Communications Inc. Confidential Page 23 of 35
3.4.4.6 Sample Rate
The accelerometer is always turned on (when powered) and samples the transducer elements
at a fixed rate. To capture an impact event, the physical event needs to last longer than the
sample period. Larger sample rates have a shorter period and can therefore resolve shorter
impacts. However, sampling the transducer at a larger rate significantly increases the power
usage, impacting battery life.
3.4.4.7 Default Configuration
Table 3-13 shows the default values for the accelerometer configuration registers.
Table 3-13: Default Values of Accelerometer Configuration Registers
Break-In Threshold
𝟑𝟎𝟎𝟎
milli-
𝒈
Impact Threshold
6000
milli-
𝑔
Value to Transmit Full-Precision
Impact Debounce Time 2 (two) seconds
Mode Break-In Threshold Disabled,
Impact Threshold Disabled,
Powered Off
Sample Rate 0x01 (1 Hz)
3.4.4.8 Example DL Messages
In the following example payloads, the Command Field is boldfaced:
•
Set Impact Threshold and Impact Debounce Time:
o
DL payload: { 0x B1 07 D0 B3 00 0A }
▪
Reg 31 and Reg 33 with their write bits set to true
▪
Impact Threshold set to
2000
milli-
𝑔
and Impact Debounce Time set to
10 seconds.
•
Set Sample Rate and read it back:
o
DL payload: { 0x B5 06 35 }
▪
Reg 35 with write bit set to true
▪
Reg 35 with write bit set to false
▪
Sample rate set to 200 Hz, and then read back
•
Power on the transducer with Impact Threshold enabled but Break-In Threshold
disabled, and set “Magnitude” as the Value to Transmit:
o
DL payload: { 0x B4 82 B2 02 }
▪
Reg 34 and Reg 32 with their write bits set to true