Overview

DataLens uses the SD card as a local backup layer to protect images during temporary network interruptions. It works together with cloud upload so captured images can be stored locally first, then uploaded once the device has a stable connection.

Why the SD card is required

The SD card acts as a fail-safe for image capture.

When DataLens captures images, they are saved directly to the SD card. This gives the device local storage that remains available even if the internet connection is interrupted.

The SD card helps protect against:

• Temporary network outages

• Missed upload cycles

• Unstable cellular or Wi-Fi connections

• Delayed cloud uploads

How the fail-safe works

DataLens uses both local storage and cloud upload:

1. DataLens captures an image.

2. The image is saved to the SD card.

3. During each upload cycle, DataLens uploads images to the cloud.

4. If the connection is lost, captured images remain stored on the SD card.

5. When a stable connection returns, DataLens resumes uploading automatically.

6. The most recent image uploads first.

7. Backlogged images on the SD card are then uploaded in sequence.

This allows DataLens to continue capturing images even when cloud upload is temporarily unavailable.

Can I access images from the SD card?

Yes. Images saved to the SD card can be accessed and downloaded locally if needed.

This is useful if you need to retrieve images directly from the device or confirm that images were captured during a connection issue.

What happens when the connection comes back?

Once DataLens has a stable connection again, it automatically resumes uploading.

The device uploads the latest image first, then continues uploading the older backlogged images stored on the SD card.

Summary

The SD card is required because it provides the local backup layer that protects image capture when cloud upload is interrupted. It helps ensure that temporary connectivity issues do not result in lost images.