About the Sens it Payload

Transcription

1 About the Sens it Payload

2 Payload structure 4 bytes 8 bytes Mode values Configuration values (optional) If the message is an uplink only frame, the payload contains only the 4 bytes of mode values. If the message is an uplink with downlink request, the payload contains the 4 bytes of modes values + 8 bytes which contains the configuration of the device.

3 Mode: 4 bytes Byte 1 Byte 2 Byte 3 Byte 4 Same for all the modes Depends on the mode The Sens it can be set into 6 different modes: Temperature & Humidity Mode: The Sens it will periodically send the temperature ( C and F) and humidity (%) values Light Mode: The Sens it will periodically send the light conditions value (lux) Door Opener Mode: Each time the door where the Sens it is affixed moves, an alert message is sent Vibration Mode: Each time the Sens it moves, an alert message is sent Magnet Mode: Each time the reed switch is closed, an alert message is sent Button Mode: Each time the Sens it button is pressed, an alert message is sent

4 Byte 1: same for all the modes b7 b6 b5 b4 b3 b2 b1 b0 Battery level MSB (most significant bit) Frame type 00: Periodic frame 01: Button frame (when the user double-clicks, payload structure of button mode) 10: Alert frame 11: New Mode frame (when device change mode) Uplink period: time between 2 frames (periodic modes Temperature and Light) 00: 10 minutes 01: 1 hour 10: 6 hours 11: 1 day Mode:

5 Byte 2: same for all the modes Temperature value MSB Battery level LSB

6 Byte 3: Depends on the mode b7 b6 b5 b4 b3 b2 b1 b0 Spare = 1 Magnet State 1: magnet detected Temperature value LSB Light Mask Light Value Max Magnet Maximum difference (X, Y or Z) for the movement

7 Byte 4: Depends on the mode Humidity Value Alert Counter Number of events that happened - Light mode: if the light value is out of range (more than 1 time-tested each second) - Door/magnet/vibration mode: usually 1 because the message is sent directly. If there are too many events (exceeds the number of message limitation), the number of events is stored Firmware version Major increment Firmware version Minor increment

8 Battery voltage computation Battery voltage = ( ( battery(5bits) * 0.05 ) ) Volts

9 Temperature & Humidity computation Temperature = ( ( temperature(10bits) 200 ) / 8 ) C Temperature(10bits) = Temperature MSB <<6 Temperature LSB Humidity = ( humidity(8bits) / 2 ) %

10 Light value computation If Light Mask = 00 Light Value = ( Light(6bits) / 96 ) lux If Light Mask = 01 Light Value = ( Light(6bits) * 8 / 96 ) lux If Light Mask = 10 Light Value = ( Light(6bits) * 64 / 96 ) lux If Light Mask = 11 Light Value = ( Light(6bits) * 1024 / 96 ) lux

11 DownLink 8 bytes Configuration values (optional) and Downlink content A downlink is required each day (86,400 ms). The payload is extended with the configuration bytes. The downlink message will update this configuration information by sending the new one (it is set on the platform). Byte 1 sendingperiod MSB Period for periodic messages tempalertlow Low border to raise temperature alert Byte 2 sendingperiod LSB Period for periodic messages tempalerthigh High border to raise temperature alert

12 Byte 3 lightalertlow Lower limit to raise light alert Byte 4 lightalerthigh Upper limit to raise light alert Byte 5 acctransientthr Upper limit to raise light alert

13 Byte 6 acctransientcount Upper limit to raise light alert Byte 7 Disable High pass filter Enable detection on Z axis Enable detection on Y axis Enable detection on X axis Data rate MODS Byte 8 Must be = 0 Threshold of door mode alert