> For the complete documentation index, see [llms.txt](https://wiki.inels.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.inels.com/inels-bus/inels-design-manager-idm3/troubleshooting-disconnected-units-in-idm3-software.md).

# Troubleshooting Disconnected Units in iDM3 Software

This document outlines the steps to troubleshoot and resolve issues when some units display as disconnected in the iDM3 software. Follow these steps to ensure efficient and accurate diagnosis of the problem.

**Step 1: Check Wiring**

* **Objective**: Ensure all connections are secure and properly configured.
* **Procedure**:
  * Visually inspect all wiring connections to the disconnected unit.
  * Verify that cables are not loose, damaged, or improperly connected.
  * Use a multimeter to check for continuity in the wiring if necessary.

**Step 2: Check Device Firmware (FW)**

* **Objective**: Confirm that the device firmware is correct and functioning.
* **Procedure**:
  * **Check Firmware Download Status**:

    * Navigate to the "Download unit FW" section in the software.
    * Verify if the device appears connected and the firmware version displayed.

    <figure><img src="/files/kwIp5FR2ZUoa7ICoZfZJ" alt="" width="563"><figcaption></figcaption></figure>
  * **Inspect Status LED on the Unit**:
    * **Constant Light**: Indicates the unit is not communicating with the Central Unit (CU).
    * **Blinking Unevenly Fast**: Suggests incorrect firmware (wrong FW).
    * **Blinking Steady**: Normally indicates the unit is operational.
  * If the LED is blinking steadily but the unit still shows as disconnected:

    * Save the current project.
    * Revisit the monitor section to see if the device now appears online and can be controlled from the monitor.

    <figure><img src="/files/ESRpz6EMUEsADQDDgDRm" alt=""><figcaption></figcaption></figure>

#### Additional Notes:

* **Device Address:** Make sure you have entered the correct hexadecimal device address as printed in the hardware
* **Saving and Rechecking**: Sometimes, saving your project and refreshing the interface can help the software recognize previously disconnected units.
* **Software and Hardware Manual**: Always refer to the iDM3 user manual for specific instructions related to hardware and software settings.
* **Technical Support**: If the issue persists, contact technical support for advanced diagnostics and possible hardware replacement.

This document provides a structured approach to identifying and resolving connectivity issues with units in the iDM3 software, ensuring minimal downtime and maintaining system integrity.


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