The Tekbox TBSL1 represents a new milestone in telemetry unit design. Rather than being locked to a particular communications technology,  the TBSL1 puts the modem components on a separate daughter board. Customers can purchase a bare TBSL1 and then fit the module for the required communications method: LoRa WAN, CatM1/NB1 or WiFi. The RTU will automatically detect which type of modem is fitted and adjust accordingly.. Readings captured by the TBSL1 are sent to the Sensori platform for display. But if you want to use an alternative platform, you can.


tbsl1 in citrus_120


The TBSL1 is built into a powder coated aluminium case. A breather vent is fitted to the top of the case to prevent moisture build-up. Waterproof connectors are used for the solar panel (5pin) and sensor (7pin)  inputs. The antenna mounts to a TNC connector on top of the case. A bracket is fitted to the rear of the case to allow the unit to be fixed to a post or mast..


Inputs and Outputs


The primary purpose for the TBSL1 is as an SDI-12 RTU. But for added flexibility it also carries two analogue inputs and one pulse counter inputs (for connection to rain gauges and flow meters). The relay output on the TBSL1 can be turned on in response to an alarm condition.


Rechargeable Battery


Power for the TBSL1 comes from an 18650 size rechargeable battery. Depending on sensor load and transmission interval, the unit may be charged via either 6V 2 watt or 6V 5 watt solar panel (12V panes must not be used).




The TBSL1 is configured using the Tekbox TBSL1 Console program. This program allows you to nominate what sensors are attached and the interval at which they will be read. You can also specify sensor warm up times.
The GUI gives access to all of the communications parameters. In a 3G/4G environment, this includes details such as the server type and login credentials. ON a LoRa WAN unit it includes the network join type, encryption keys and transmission interval.
With the GUI you can send commands to the attached SDI-12 sensors, for configuration and testing and can also send commands to the modem .




Alarms may be set on the value of any of the internal or external sensor channel, or on the value of a calculated channel . When an alarm is triggered the units may send an SMS to one or more recipients (3G/4G units) or send a message via the server (LoRa WAN units) . Further alarms may be generated from  within n the server  software once the data reaches it




The TBSL1-LO is the designation given to the unit when it is fitted with a LoRa WAN modem module. This module utilises a LoRa WAN modem manufactured by Rising HF..
 The TBSL1-LO is normally supplied with a 900 MHz radio module allowing it to be used on the Australian, US and Asian channel plans: AS915, US915 and AS923.  An 868 MHz module for use in Europe may also be supplied on request.
For more details, see the TBSL1-LO brochure.




The 4G version of the TBSL1 uses a world band Quectel modem which supports both NB1/2 and Cat M1..
The TBSL1-4G sends the captured readings out via the MQTT protocol, meaning it can be integrated easily with many of the emerging “IoT” (Internet of Things) packages. Transfer is also available via FTP and HTTP.  Alternatively the data can be pushed to the Tekbox IoT broker so it can be accessed alongside data from the various LoRa WAN unit. TBSL1-4G Brochure.




The WiFi option is only available in the TBSL1-DC, a version of the TBSL1 designed to run on Alkaline batteries. Alkaline cells are cheap, readily available and have high capacity. Coupled with the low power requirements of the WiFi modem, you can expect long life from a set of batteries. You can deploy the TBSL1-WIFI anywhere you have WiFi signal. The standard antenna will give a range of 30 to 50 metres. Switch it to a directional Yagi antenna and you can achieve up to 1km range.