[ISSUE]B-SOM 40x Serial command not working

[cjh]

I am not getting any output (or input) from the "Serial" device on my B-SoM module. After being unable to get it to work with my code, I dropped back to the Serial demo code from this page - peek() - Serial | Reference | Particle

// EXAMPLE USAGE
void setup()
{
  Serial.begin(9600);
}
void loop()
{
  Serial.write(45); // send a byte with the value 45
  int bytesSent = Serial.write(“hello”); //send the string “hello” and return the length of the string.
}

I get no output from a Putty terminal, the Workbench monitor, or my RealTerm terminal emulator. I'm at a loss since I've used this feature extensively in the past.

My Environment Audit Report:

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            "id": "ya-technologies.vslabx-extension",
            "version": "0.2.2"
        },
        {
            "id": "ZixuanWang.linkerscript",
            "version": "1.0.4"
        }
    ]
}

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[rickkas7]

What development board are you using with the B-SoM? Have you connected the USB to the correct port? Some of the boards have a second USB port that's connected to the cellular modem.

Does particle usb list show the device?

Are you sure the Micro USB cable is a data cable? A charger cable won't work.

What is the status LED showing? Certain states like breathing magenta won't run user code.

[cjh]

I'm using a target board, custom for this project. I am using the same USB connector I have used in the past. This board DOES have a second USB port connected to the modem, but I'm using the correct one - it's the same one I'm using for local flash operations, which work with no problems.

particle usb list does show the module name, ID number, and type "(B-SoM)", again as expected since I can do local flash operations.

And yes, I have a true micro USB cable.

The status LED is breathing Cyan, indicating its connected to the cloud.

Thanks - any other suggestions?

[rickkas7]

In that case, my guess is that you have a bad USB CDC device driver associated with the Particle device. See this article on fixing it on WIndows 10 and 11.

[cjh]

After following the directions shown there, I do now see the output from the Serial device via the CDC serial port.
Thank you very much!