If there was a known issue with your device when trying to use it with certain versions of Windows, that might be understandable, but this wouldn't be a situation where this USB device doesn't work with Dell laptops but works with some other vendor's laptops. The COM number is assigned to the USB serial port adapter itself whenever it's connected, and again that's all handled by Windows, not the system. There isn't a COM number for the entire system. Also, just to clarify something, in your original post you asked for the "USB serial port COM number" of your Dell system. They relate to operating system versions, because the operating system would require certain drivers and the operating system assigns COM ports (which the user can change through Device Manager). Drivers and COM port issues would not relate to specific to system models. Backed by Lifetime Warranty, the DB25 to DB9M Serial Adapter is designed for durable, reliable performance and connectivity. Unfortunately no, and I have no idea why they would have told you to contact Dell. This DB25 to DB9 Serial Adapter converts a 25-pin serial port to a 9 pin male connector.
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