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title: "Identifying the correct Serial Port for your PLC device"
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id: 16724283965596
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---
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When multiple devices are connected to your computer, it's essential to identify which serial ports belong to your PLC device. Follow these steps to determine the correct port:
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1. Disconnect your PLC device from your computer.
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1. Select **Project > Refresh current target** to refresh the list of ports.
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1. Open the runtime sketch download port menu, and take note of the available ports.
Copy file name to clipboardExpand all lines: content/Software Support/PLC IDE/If-youre-having-trouble-connecting-a-device-to-PLC-IDE.md
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- Ensure you use a USB cable that supports data transfer.
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- When downloading the runtime, or connecting to the device, ensure you're [targeting the correct port](#about-ports).
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- When downloading the runtime, or connecting to the device, ensure you're [targeting the correct port](https://support.arduino.cc/hc/en-us/articles/16724283965596).
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- When opening a project created with an earlier version of the PLC IDE, some issues may occur. Try creating a new project (**File > New Project**) to see if this resolves the issue.
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---
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## About port selection
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## Troubleshooting common issues
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It's important to understand which ports to target when configuring your PLC device connection.
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### Installing PLC IDE
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### How to identify which ports belong to your device
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-**"User cancelled installation"**
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If other devices connected to your computer have open serial ports, you need to determine which ports belong to your PLC device:
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This error occurs when the installation is interrupted before the Arduino IDE Tools Setup Wizard completes.
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1. Disconnect your PLC device from your computer.
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1. Select **Project > Refresh current target** to refresh the list of ports.
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1. Open the runtime sketch download port menu, and take note of the available ports.
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Restart the installation process and ensure that you allow the Setup Wizard to finish without interruption.
This error may occur when attempting to download the runtime sketch.
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Solutions:
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-[Verify that the correct port is selected in the manual sketch download widget.](https://support.arduino.cc/hc/en-us/articles/16724283965596)
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- Double-tap the device’s reset button to put it in bootloader mode. First, try selecting the correct COM port. If that doesn’t work, set the Port to “Automatic (BootLoader)” and attempt to download the sketch again.
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- Close any applications that might be blocking the port, such as the Arduino IDE serial monitor.
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-[Reformat the QSPI flash memory](https://support.arduino.cc/hc/en-us/articles/16206977438748-Reset-the-flash-memory-on-STM32H747-based-devices)
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- Create a new project and attempt to download the runtime again.
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-**"Error: "(DownloadSketch) Can not download sketch: COM port must be used!""**
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This error occurs when no COM port is selected.
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[Select the correct COM port in the manual sketch download widget](https://support.arduino.cc/hc/en-us/articles/16724283965596) and attempt the download again.
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1. Look for **USB Serial Device** items, and note the port names.
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-**If nothing happens when downloading the runtime sketch**
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- Ensure you've installed the latest version of the Arduino PLC IDE software from the Arduino Software page.
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- Verify the "T" Folder Exists
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`C:\Users\<Profile-Name>\AppData\Local\T`
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If you can't find this folder, Copy it from the computers Admin profile (which requires access authorization e.g. admin password), and then pasting it in the same path on the user profile.
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- Restart PLC IDE.
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---
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## Solutions for specific problems
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### Connect to device
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-**If the "On-Line > Set up communications" and "On-line > Connect" options are disabled**
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### If the "On-Line > Set up communications" and "On-line > Connect" options are disabled
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These options are only available when a project is open. Select **File > New Project** to create a new project.
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These options are only available when a project is open. Select **File > New Project**to create a new project.
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-**Error: “Unable to start the communication”**
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### Error: “Unable to start the communication”
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When choosing **On-line > Set up communications** you may get this error message:
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When choosing **On-line > Set up communications** you may get this error message:
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```
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Unable to start the communication
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Choose 'On-line / Set up communication' to configure it
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```
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Resolve the issue by selecting **On-line > Set up communication** and checking the settings. See [Connect to the Device](https://docs.arduino.cc/software/plc-ide/tutorials/plc-ide-setup-license#5-connect-to-the-device) for help.
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-**“Error” in bottom right corner on first use of the board**
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[Reformat the QSPI flash memory.](https://support.arduino.cc/hc/en-us/articles/16206977438748-Reset-the-flash-memory-on-STM32H747-based-devices)
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---
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```
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Unable to start the communication
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Choose 'On-line / Set up communication' to configure it
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```
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### License activation
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Resolve the issue by selecting **On-line > Set up communication** and checking the settings. See [Connect to the Device](https://docs.arduino.cc/software/plc-ide/tutorials/plc-ide-setup-license#5-connect-to-the-device) for help.
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When activating the license for Arduino Opta or Portenta Machine Control, the following errors may occur:
1. Double-tap the reset button on the device to set it to **bootloader mode**, and try downloading the sketch again.
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2. Close any applications that may be blocking the port, such as the serial monitor in Arduino IDE.
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3.[Check the port selection](#about-ports).
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Offline activation: `Could not activate licenses for the following products: AIPC_Arduino_PMC`
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### If nothing happens when downloading the runtime sketch
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Solutions:
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<!-- NOTE: Since missing PLC IDE Tools was the only known cause of this issue, it may no longer be relevant. -->
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- Upload the [Memory Partitioning sketch](https://docs.arduino.cc/tutorials/opta/memory-partitioning/) using Arduino IDE. Then, try to activate the license again.
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1. Ensure you've installed the latest version of the **Arduino PLC IDE** software from the [Arduino Software page](https://www.arduino.cc/en/software#arduino-plc-ide).
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2. Restart PLC IDE.
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- If you are using a company-owned computer, please follow these steps:
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### Error: "(DownloadSketch) Can not download sketch: COM port must be used!"
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1. Temporarily disable any antivirus software running on your system.
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When downloading the runtime sketch, this error may appear in the console:
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1. Temporarily disable the firewall on your computer.
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```
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(DownloadSketch) Can not download sketch: COM port must be used!
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```
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1. Attempt the license activation process again.
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It can occur if the wrong port is selected in the manual sketch download widget. If you're unsure which port to use, see [About ports in PLC IDE](#about-ports).
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> [!NOTE]
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> Corporate networks and security programs can sometimes interfere with license activation. By temporarily disabling these protective measures, you may be able to complete the activation successfully.
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