Carrier Network Service Tool V Manual Jun 2026

| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | | Incorrect COM port, faulty USB converter, or no power to controller. | Verify the converter's COM port in Windows Device Manager. Check for 24 VAC at the controller. Test the converter on a known-good device. | | Duplicate address error | Two devices on the CCN bus share the same network address. | Run Network Diagnostics > CheckBus to identify and resolve duplicate addresses. | | NST V software won't launch | USB converter (license dongle) not connected or driver issue. | Ensure the converter is plugged in and the drivers are properly installed before launching the software. | | Data Collection tool missing | The separate DCT program is not installed. | The DCT is not always included in the base NST V installation. Contact your local Carrier support for access to the tool. | | Can't find NST V manual | A dedicated manual for Version V does not exist. | Use the software's internal help system and consult the NST IV manual for foundational principles, as they are largely the same. |

If the software fails to communicate with the network, use this checklist to resolve the issue. Carrier Network Service Tool V Manual

Are you facing a specific or communication issue? | Problem | Likely Cause | Solution |

Check the physical wiring polarities (+ and -) and confirm the correct COM port is selected. Test the converter on a known-good device

Most users never read the manual's appendix, but that is where gold lies.

Once connected, you can perform primary maintenance and commissioning tasks. Scanning the Network Click the button on the main toolbar.