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Summary of Contents for TEKELEK LoRaWAN
- Page 1 Ultrasonic LoRaWAN User Manual...
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Page 2: Table Of Contents
Logging Data ................................3 Principle of Data Upload ............................3 Alarm Mode ................................4 SRC & SRSSI ................................4 Configuring Device ..................................5 LoRaWAN Network Server Response ......................... 5 Message Types ................................5 3.2.1 Configuration Parameters ........................... 6 3.2.2 Product ID reference ............................6 3.2.3... -
Page 3: Product Description
The functionality of the sensor includes various alarm triggers, configurable measurement schedule, reporting schedules & temperature measurement. Once activated on a LoRaWAN network it will send the measurement data according to its configuration through the network gateways to the endpoint server accessible by end users. -
Page 4: Description Of Data Transmission
Manual Operation The sensor can be forced to connect to the LoRaWAN network server at any time by briefly pressing the button for one second to wake up the sensor. The sensor will take an ultrasonic measurement, connect to the gateway and transmit a status message which includes a current ultrasonic measurement. -
Page 5: Alarm Mode
When a static alarm is activated, an immediate message is sent to the LoRaWAN network server. This message will indicate which of the static limits was exceeded and will also contain two ultrasonic readings, the first ultrasonic reading is the one that exceeded the threshold and the second is the previous reading made as defined by the measurement schedule. -
Page 6: Configuring Device
Configuring Device LoRaWAN Network Server Response Every time a sensor makes an outgoing status connection to the gateway, the LoRaWAN network server has the option to respond with configuration settings to alter the operation of the device. Sending responses to the sensor is very useful for tasks such as changing the connection schedule. Care must be taken, as sending the wrong settings could render the device incapable of correct operation. -
Page 7: Configuration Parameters
Ultrasonic LoRaWAN User Manual 3.2.1 Configuration Parameters Data Parameter Read/ Data Default Parameter Byte Description 0x40 Write Type Value Length 0x4000 Sonic Control 0x49351928 Characteristic of the Advanced Sonics routine 0x4001 Static Limit1 Characteristics of the Limit Alarm (Low/High, Threshold etc) -
Page 8: Measurement
3.2.3 Measurement This is a standard message that the sensor sends as scheduled to the LoRaWAN network server. It includes the latest ultrasonic measurement plus 3 previously sent readings (4 readings in total). The individual readings comprise of a 2-byte ullage - this represents the distance between the ultrasonic transducer and the surface of the liquid. -
Page 9: Status
Ultrasonic LoRaWAN User Manual 3.2.4 Status This is a packet that the sensor sends as scheduled to the LoRaWAN network server. It is also generated by pressing the button on the sensor. Sample Payload: (Payloads are Hexadecimal) 300000010106360063006300040600181BAA Byte #... -
Page 10: Parameter Read Request
3.2.5 Parameter Read Request This is a message issued by the LoRaWAN network server requesting information on current parameter settings of the sensor. This can contain several parameter requests linked together but is limited to a maximum combined size of 45 bytes. -
Page 11: Parameter Read Response
3.2.6.1 Response code Byte This byte is sent in response to a LoRaWAN downlink frame (i.e. to change a parameter). In normal circumstances, a response code of 0 is expected to be returned, indicating the downlink action was a success. -
Page 12: Parameter Write Request
3.2.7 Parameter Write Request This is a message issued by the LoRaWAN network server to request a change to the parameter settings on the LoRaWAN network sensor. The data representing the parameter settings may be of variable length as multiple parameters can be sent simultaneously and each parameter is also of variable length. -
Page 13: Alarm Notification
3.2.8 Alarm Notification This is a packet that the sensor sends to the LoRaWAN network server if a valid ultrasonic reading exceeds an alarm threshold. This packet will indicate which of the static limits was exceeded and will also provide two ultrasonic readings. - Page 14 SRC & SRSSI filter to be considered a valid reading. The default values are {9:4} and it is not recommended to change these without guidance from application support. Once an alarm is generated, it is sent from the sensor and it requires a LoRaWAN network server response over the LoRaWAN network.
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Page 15: Scheduler
3.3.1 TX Period (0500) The TX period is the time between packet transmissions to the LoRaWAN network server, measured in hours. Increasing the frequency of radio transmissions reduces the battery lifetime. The formula for creating the payload structure for this is as follows:... -
Page 16: Status Message Tx Period (0505)
Ultrasonic LoRaWAN User Manual 3.3.4 Status Message TX period (0505) The Status message TX period is the time between each status packet radio transmission, measured in days. The status period should be set to a minimum of twice the scheduler TX period for correct operation. - Page 17 For this reason, it is preferred to use the above profiles. It is only possible to change a sensor configuration when the sensor wakes up to perform measurement and transmits to the LoRaWAN network or manually by pressing the sensor button. 16 |...
- Page 18 Ultrasonic LoRaWAN User Manual (See Section 3.2.1 for parameters table) Sample Payload (Default Schedule): (Payloads are Hexadecimal) 42000004050060540000040502100E000004050360540000040505803A0900040507805101000140050F Byte # Payload Description Notes Results Defines the payload type 0x42 = Parameter Write Response Parameter Write Response (See Section 3.2)
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Page 19: Static Alarm Threshold Limits
Ultrasonic LoRaWAN User Manual 3.3.7 Static Alarm Threshold Limits Each sensor can have up to three static alarms, so depending on the polarity an alarm is generated if the ullage is greater, or less than these values. The alarm threshold must be 22cm or greater. The device has 2cm of in-built hysteresis. -
Page 20: Miscellaneous Parameters
Bit 1 & 2 of the Configuration flags set the ‘Measurement Frame Confirmation’ – this is how frequently measurement messages are ‘confirmed’ or acknowledged by the LoRaWAN network server. (The parameter 0x4007 allows the user to write the appropriate value.) -
Page 21: Sonic Control
RF-RSSI Threshold The Ultrasonic LoRaWAN sensor has an LED interface to give an approximate indication of the LoRaWAN RSSI signal strength. The RSSI limit, which is reflected by the LED flashing sequence in 6.1, sets the point where the LED flash code is alternate green / red flashing. -
Page 22: Technical Specifications
The pushbutton switch is used to force the unit to make a measurement and deliver the data to the server endpoint. It is also used to wake a unit from dormant state and force it to connect to a LoRaWAN network. -
Page 23: Trouble Shooting
The button and LED can appear unresponsive occasionally, for example if the sensor is active performing a join request to the LoRaWAN network. This is a consequence of internal activity and the user is advised to wait for a few minutes before retrying. -
Page 24: Faq
A. Yes, but LoRa signal strength depends on distance from the nearest base station (LoRaWAN gateway). Always check using a LoRaWAN tester and using the LEDs on the unit before installing. Place the unit as near as possible to its installation point for testing and remove hands.
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