COM ports

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I am installing a brainmaster eeg device onto a compaq nx9030 laptop. the brainmaster unit uses a serial connector, and the laptop only has usb. i am using a cables unlimited adapter. The brainmaster device cannot recieve information from the laptop but it can connect to com port 3. the problem is none of the ports show up in device manager. should this matter since i am using usb, i have another computer running the device but it connects through the serial connection. both systems run xp pro without service pack 2. does anyone know if there are any comport related issues with xp. i dont think it matters since it is usb but, the other machine works that uses serial connector.

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Our Field Service people require the use of serial ports to communicate with PLC’s. The SIIG, Inc. model lo1037 Single Serial PC Card (Type II/III Card Slot) provides stable communications and cost about $50.00.

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  • Bobkberg
    I'm not sure if there are any XP issues, but you could try buying a usb to serial/Com port adapter. Several firms market these devices. They're roughy in the $20 range. BobKberg
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  • Bobkberg
    I'm not sure if there are any XP issues, but you could try buying a usb to serial/Com port adapter. Several firms market these devices. They're roughly in the $20 range. BobKberg
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  • Jaysea
    While the USB to Serial is an option, this would not work with our application. The laptops would not communicate with the PLC's. The serial cards worked without a problem.
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  • Ccalvin
    I do not know about the Compaq but the IBM laptops I have used turn off the COM port by default to save battery. Sometimes COM is set up for infrared instead of the plug on the back. Check the hardware settings to see if the COM port is enabled and configured properly.
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  • Wsjoseitke
    I wrote a GPS program thas uses RS232. I used a PC with a serial port (COM1) and a USB-Serial cable converter ins USB1 ( meaning COM3). Every thing worked fine. If you are programming in C++, there is no way to know the names of the serial ports available, but using Java's javacomm API y could get the names. I saw also some samples with C# and VB.Net May be, you can use the Windows Terminal for testing communication without your real device. Is the COM port well configured (Data bits, parity, bauds and stop bits)
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  • Duduspace
    I beleive Jaysea is right, some applications just refuse to work with USB/Serial converters while others do. I think this has to do with how the programs are written, programmers have a way of not following standards at times. Getting the PC card with a serial point is a sure way of solving the problem. Then you don't have any incompatibility issues to deal with.
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  • DennisW
    If program was written to communicate directly with the COM port it probably will only work with actual COM port hardware. This is non standard but was considered the way to do it once upon a time. Call to the system for I/O would have allowed Windows to route the serial connection to USB serial (or any other connection that Windows can allow).
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