7
Data report configuration and sending period are as following:
6.1 ActiveThreshold and InActiveThreshold
Formula
Active Threshold =
Critical value ÷
9.8
÷
0.0625
* The gravitational acceleration at standard atmospheric pressure is 9.8 m/s
2
* The scale factor of the threshold is 62.5 mg
Active Threshold
Active Threshold can be changed by ConfigureCmd
Active Threshold range is
0x0003-0x00FF
(default is 0x0003);
InActive Time
InActive Time can be changed by ConfigureCmd
InActive Time means that the acceleration variation during the stationary time is less than the set
InActive Threshold to declare stationary.
Example
Assuming that the critical value is set to 10m/s
2
, the Active Threshold (or InActive Threshold) to be set is
10/9.8/0.0625=16.32
Active Threshold (or InActiveThreshold) to be set integer as 16.
6.2 Calibration
The accelerometer is a mechanical structure that contains components that can move freely.
These moving parts are very sensitive to mechanical stress, far beyond solid-state electronics.
The 0g offset is an important accelerometer indicator because it defines the baseline used to measure acceleration.
After installing R718EB, users need to let the device rest for 1 minute, and then power on. Then, turn on the device and wait for
the device taking 1 minute to join the network. After that, the device will automatically executes the calibration.
6.3 Example of data configuration
FPort
：
0x07
Bytes
1
1
Var(Fix =9 Bytes)
CmdID
DeviceType
NetvoxPayLoadData
CmdID
– 1 byte
DeviceType
– 1 byte – Device Type of Device
NetvoxPayLoadData
– var bytes (Max=9bytes)
Min Interval
(Unit:second)
Max Interval
(Unit:second)
Reportable Change
Current Change≥
Reportable Change
Current Change
＜
Reportable Change
Any number between
1~65535
Any number between
1~65535
Can not be 0.
Report
per Min Interval
Report
per Max Interval
