COM Ports

Discussion in 'alt.windows7.general' started by Roger Mills, Mar 15, 2012.

  1. Roger Mills

    Roger Mills Guest

    My Dell laptop doesn't have *any* physical COM ports.

    I have a USB Fax/Modem which was mapped to COM16 - which I needed to
    change in order to make it work with a piece of software which only
    recognises low COM numbers.

    When I found the modem in Device Manager, and then selected Properties
    and Advanced Port Settings, it showed 256 COM ports of which COM3
    through COM19 were shown to be "in use".

    In use for *WHAT*? Anyone know?
    --
    Cheers,
    Roger
    ____________
    Please reply to Newsgroup. Whilst email address is valid, it is seldom
    checked.
    Roger Mills, Mar 15, 2012
    #1
  2. Roger Mills

    Ken1943 Guest

    On Thu, 15 Mar 2012 11:45:30 +0000, Roger Mills <>
    wrote:

    >My Dell laptop doesn't have *any* physical COM ports.
    >
    >I have a USB Fax/Modem which was mapped to COM16 - which I needed to
    >change in order to make it work with a piece of software which only
    >recognises low COM numbers.
    >
    >When I found the modem in Device Manager, and then selected Properties
    >and Advanced Port Settings, it showed 256 COM ports of which COM3
    >through COM19 were shown to be "in use".
    >
    >In use for *WHAT*? Anyone know?


    Maybe the Windows 7 built in fax program is got everything taken. You
    could go to Control Panel > Programs & Features > Turn windows features
    on/off and uninstall the fax program. It's somewhere in the list. If it
    doesn't help, you can turn it on again, no problem.


    KenW
    Ken1943, Mar 15, 2012
    #2
  3. Roger Mills

    Ken1943 Guest

    On Thu, 15 Mar 2012 11:45:30 +0000, Roger Mills <>
    wrote:

    >My Dell laptop doesn't have *any* physical COM ports.
    >
    >I have a USB Fax/Modem which was mapped to COM16 - which I needed to
    >change in order to make it work with a piece of software which only
    >recognises low COM numbers.
    >
    >When I found the modem in Device Manager, and then selected Properties
    >and Advanced Port Settings, it showed 256 COM ports of which COM3
    >through COM19 were shown to be "in use".
    >
    >In use for *WHAT*? Anyone know?

    Make sure you remove the modem first.


    KenW
    Ken1943, Mar 15, 2012
    #3
  4. Roger Mills

    Rob Guest

    On 15/03/2012 11:45, Roger Mills wrote:
    > My Dell laptop doesn't have *any* physical COM ports.
    >
    > I have a USB Fax/Modem which was mapped to COM16 - which I needed to
    > change in order to make it work with a piece of software which only
    > recognises low COM numbers.
    >
    > When I found the modem in Device Manager, and then selected Properties
    > and Advanced Port Settings, it showed 256 COM ports of which COM3
    > through COM19 were shown to be "in use".
    >
    > In use for *WHAT*? Anyone know?


    I've not seen that yet in Windows 7, but it was common in XP and
    the result of badly designed USB/Serial or BluTooth interface chips
    together with a suspected USB enumeration bug in XP.
    Plugging anything with one of those chips into more than one USB
    port resulted in a new COM port being created, leaving more and
    more unused phantom ports listed. In your case I suspect internal
    blutooth is the cause.
    The fix was rather tedious, but basically involved deleting all
    of the COM ports from device manager and rebooting.
    If any COM ports were *really* being used by internal devices,
    they were automatically recreated.
    You could try doing the same thing in 7.
    HTH
    --
    Rob
    Rob, Mar 15, 2012
    #4
  5. Roger Mills

    Paul Guest

    Rob wrote:
    > On 15/03/2012 11:45, Roger Mills wrote:
    >> My Dell laptop doesn't have *any* physical COM ports.
    >>
    >> I have a USB Fax/Modem which was mapped to COM16 - which I needed to
    >> change in order to make it work with a piece of software which only
    >> recognises low COM numbers.
    >>
    >> When I found the modem in Device Manager, and then selected Properties
    >> and Advanced Port Settings, it showed 256 COM ports of which COM3
    >> through COM19 were shown to be "in use".
    >>
    >> In use for *WHAT*? Anyone know?

    >
    > I've not seen that yet in Windows 7, but it was common in XP and
    > the result of badly designed USB/Serial or BluTooth interface chips
    > together with a suspected USB enumeration bug in XP.
    > Plugging anything with one of those chips into more than one USB
    > port resulted in a new COM port being created, leaving more and
    > more unused phantom ports listed. In your case I suspect internal
    > blutooth is the cause.
    > The fix was rather tedious, but basically involved deleting all
    > of the COM ports from device manager and rebooting.
    > If any COM ports were *really* being used by internal devices,
    > they were automatically recreated.
    > You could try doing the same thing in 7.
    > HTH


    That can happen, if the USB device doesn't have a serial number.

    You can use UVCview to review the USB config data, and check for
    a serial number. I have two FTDI based USB to serial adapters,
    and they come with serial numbers.

    iSerialNumber: 0x03
    English (United States) "FTEHLXJX"

    Paul
    Paul, Mar 15, 2012
    #5
  6. In message <>, Roger Mills
    <> writes:
    >My Dell laptop doesn't have *any* physical COM ports.
    >
    >I have a USB Fax/Modem which was mapped to COM16 - which I needed to
    >change in order to make it work with a piece of software which only
    >recognises low COM numbers.
    >
    >When I found the modem in Device Manager, and then selected Properties
    >and Advanced Port Settings, it showed 256 COM ports of which COM3
    >through COM19 were shown to be "in use".
    >
    >In use for *WHAT*? Anyone know?


    No idea, but were you able to use COM 2 or 1 (or possibly 0)?
    --
    J. P. Gilliver. UMRA: 1960/<1985 MB++G.5AL-IS-P--Ch++(p)Ar@T0H+Sh0!:`)DNAf

    All I ask is to _prove_ that money can't make me happy.
    J. P. Gilliver (John), Mar 15, 2012
    #6
  7. Roger Mills

    Roger Mills Guest

    On 15/03/2012 20:49, J. P. Gilliver (John) wrote:
    > In message <>, Roger Mills
    > <> writes:
    >> My Dell laptop doesn't have *any* physical COM ports.
    >>
    >> I have a USB Fax/Modem which was mapped to COM16 - which I needed to
    >> change in order to make it work with a piece of software which only
    >> recognises low COM numbers.
    >>
    >> When I found the modem in Device Manager, and then selected Properties
    >> and Advanced Port Settings, it showed 256 COM ports of which COM3
    >> through COM19 were shown to be "in use".
    >>
    >> In use for *WHAT*? Anyone know?

    >
    > No idea, but were you able to use COM 2 or 1 (or possibly 0)?


    Yes, I was able to use COM2 - which worked with the software which
    didn't like COM16.
    --
    Cheers,
    Roger
    ____________
    Please reply to Newsgroup. Whilst email address is valid, it is seldom
    checked.
    Roger Mills, Mar 15, 2012
    #7
  8. Rob wrote:
    > On 15/03/2012 11:45, Roger Mills wrote:
    >> My Dell laptop doesn't have *any* physical COM ports.
    >>
    >> I have a USB Fax/Modem which was mapped to COM16 - which I needed to
    >> change in order to make it work with a piece of software which only
    >> recognises low COM numbers.
    >>
    >> When I found the modem in Device Manager, and then selected Properties
    >> and Advanced Port Settings, it showed 256 COM ports of which COM3
    >> through COM19 were shown to be "in use".
    >>
    >> In use for *WHAT*? Anyone know?

    >
    > I've not seen that yet in Windows 7, but it was common in XP and
    > the result of badly designed USB/Serial or BluTooth interface chips
    > together with a suspected USB enumeration bug in XP.
    > Plugging anything with one of those chips into more than one USB
    > port resulted in a new COM port being created, leaving more and
    > more unused phantom ports listed. In your case I suspect internal
    > blutooth is the cause.
    > The fix was rather tedious, but basically involved deleting all
    > of the COM ports from device manager and rebooting.
    > If any COM ports were *really* being used by internal devices,
    > they were automatically recreated.
    > You could try doing the same thing in 7.
    > HTH


    That happens with USB on my laptop. I have a few
    non-normal usb comm things and Win7 likes to create a new
    com port if I plug them into a different usb jack other
    than the last one used. I periodically delete them all
    and start over. My laptop is often used for industrial work.
    Paul in Houston TX, Mar 15, 2012
    #8

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