Rejeee SL103-HF-A1 – USB Not Detected / SensorTool Configuration

LPWAN Nodes
1

Dear RAKwireless Support Team,

We recently purchased two Rejeee SL103-HF-A1 Multiple External Temperature Sensor devices through RAKwireless for our Epoch Fermentation monitoring project in Nicaragua.

We are experiencing difficulties accessing the devices through USB-C for configuration.

Both devices power on and respond to the SYNC button. The SENSOR indicator turns green, and the TX indicator activates. However, neither device is detected when connected to a computer.

We have tested both units on multiple Windows computers and a MacBook Air, using verified USB data cables. We also installed the CH340/CH341 drivers, but no USB serial port or device appears.

Could you please assist us with the following questions?

  1. Does the SL103-HF-A1 require a specific procedure or button combination to enable USB configuration mode?
  2. Could you provide the official SensorTool software download link for Windows, along with the required USB drivers?
  3. How can we retrieve or configure the DevEUI, JoinEUI/AppEUI, and AppKey for OTAA activation?
  4. Does this model support the US915 frequency band, and how should we configure it to work with our Milesight UG65 LoRaWAN gateway?
  5. Can the device operate with only one DS18B20 temperature probe connected, leaving the other two disconnected or disabled?
  6. Can the original temperature probes be replaced with longer DS18B20 probes, approximately 1 meter in length, without affecting accuracy or device operation?
  7. Can we configure the measurement and transmission intervals to reduce battery consumption?

Our objective is to monitor tobacco fermentation temperatures using one external probe per device, with approximately three transmissions per day.

We would appreciate the configuration manual, software, and any technical recommendations for this application.

Thank you for your assistance.

Best regards,

Manuel Rubio
Epoch Fermentation Project
Estelí, Nicaragua

2

Welcome to RAK forum Manuel,

Let me assist you on this.

  1. You only need to power on the device. Once you connected the USB cable, the power LED should be on at least. It should also be detected by the PC as serial port. Does it have LED but no Serial port detected?
  2. The link for windows of Sensor Tool is here and the USB driver here.
  3. You can get the OTAA parameters using the Sensor Tool. However, these are read only.
  4. Yes. US915 is supported if you have 915Mhz version and can be configured on the app.
  5. You will get all three temperature readings. You cannot disable to have one channel only.
  6. This is possible but it will void the warranty. In addition, longer wire might have impact on stability of parsing the readings depending on environment.
  7. Yes. Configurable via the app.

User manual is here.