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If you have followed the steps above and still cannot download data from your DT-172, run through this quick checklist:
If the software opens but displays a "No Connection", "Port Error", or "Communication Timeout" message, the software is looking at the wrong virtual COM port. Keep the data logger plugged into the USB port.
The software and the USB driver are separate components. After installing the software, you must often manually point Windows to the driver files. Open .
Right-click on the desktop shortcut or the .exe file of the data logger software. Select from the context menu. Click on the Compatibility tab.
For Windows 11, if the device stops working after an update, ensure "Serial port enumeration" is enabled in the device properties within Device Manager. 3. Troubleshooting Communication Issues If the logger still won't connect: Battery Check: The Go to product viewer dialog for this item.
Once the software handshake is established, the DT-172 will reliably deliver years of service. If your device is still not working after these steps, the physical USB-to-serial chip on the PCB may have failed. In that case, switch entirely to Bluetooth retrieval using a generic serial monitor, or purchase a replacement logger (CEM DT-173 or DT-120 for newer software compatibility).
Right-click the Windows Start button and select .
Step 3: Configure Administrative Privileges and Compatibility
Some third‑party sites claim to host the driver, but these come with serious risks: outdated versions, bundled adware/malware, or broken download links. A typical forum thread illustrates the problem perfectly:
If you have followed the steps above and still cannot download data from your DT-172, run through this quick checklist:
If the software opens but displays a "No Connection", "Port Error", or "Communication Timeout" message, the software is looking at the wrong virtual COM port. Keep the data logger plugged into the USB port.
The software and the USB driver are separate components. After installing the software, you must often manually point Windows to the driver files. Open .
Right-click on the desktop shortcut or the .exe file of the data logger software. Select from the context menu. Click on the Compatibility tab.
For Windows 11, if the device stops working after an update, ensure "Serial port enumeration" is enabled in the device properties within Device Manager. 3. Troubleshooting Communication Issues If the logger still won't connect: Battery Check: The Go to product viewer dialog for this item.
Once the software handshake is established, the DT-172 will reliably deliver years of service. If your device is still not working after these steps, the physical USB-to-serial chip on the PCB may have failed. In that case, switch entirely to Bluetooth retrieval using a generic serial monitor, or purchase a replacement logger (CEM DT-173 or DT-120 for newer software compatibility).
Right-click the Windows Start button and select .
Step 3: Configure Administrative Privileges and Compatibility
Some third‑party sites claim to host the driver, but these come with serious risks: outdated versions, bundled adware/malware, or broken download links. A typical forum thread illustrates the problem perfectly: