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I have laptop PC with no Serial Port (COM port). Trying to get work this device (BTW: this device works on PC's with built-in COM port) I'm using USB to COM converter for connecting this device to Laptop PC via USB.

The problem is: Device's software doesn't recognize this device (which connected via USB to COM converter) on laptop pc {with no built-in COM port)

I think that, a common problem with usb dongles is that they get a virtual serial port id > COM4, and that causes a lot of problems with many windows apps. Probably the device's software requires COM1 or COM2.

What do you think, how to deal with that problem? Tried to manually change from device manager, no success.

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What problems do appear when you try to change it in device manager? As far as I know, that's the default way to do it and it works fine with me. Also any details on the port itself? Did you try with newer drivers? How exactly did you try to change the number? – AndrejaKo Oct 28 '11 at 16:51
I changed it from device manager. Restarted application, still doesn't recognize. I wanna know is there any difference between virtual COM port and real (physical) one – Tural Teyyuboglu Oct 28 '11 at 16:56
There could be differences, but now knowing the application and the manufacturer of the USB->RS-232 cable I can't help. Some chips do not provide all pins which RS-232 ports use and in some uses (such as bitbanging) USB to serial cables are not useful because of USB limitations (it can transfer quickly large amounts of data but can't quickly sent control signals). If such is the case then the application may not work or work very slowly. – AndrejaKo Oct 28 '11 at 17:04
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