Windows 10: Problems with Phisical Serial Ports Com3 Com4

Discus and support Problems with Phisical Serial Ports Com3 Com4 in Windows 10 Support to solve the problem; WINDOWS 10 I am working it with Arduino microcontrollers connecting them via ports com3 or com4. I had a random problem where half of the time... Discussion in 'Windows 10 Support' started by dziubym, Jun 18, 2020.

  1. dziubym Win User

    Problems with Phisical Serial Ports Com3 Com4


    WINDOWS 10
    I am working it with Arduino microcontrollers connecting them via ports com3 or com4.
    I had a random problem where half of the time communication did not work. I was receiving semaphore time out problems.
    The problem was usually going away after the series of restarts. I was trying to find a permament fix. I thought there is something wrong with COM3 and COM4 settings. I tried to delet and install them anew and now I don't see them anymore. And have no clue how to fix it.
    In Control Panel automatic scan for new hardware is not detecting them.
    I am including two screenshots to describe my dilema.
    I managed to somehow enable the communication to work on COM4 last night.
    Now as you can see I see no COM3 COM4 in Control Panel but when I list the list of ports it shows COM4 as Busy.

    Any help would be greatly appreciated
    Problems with Phisical Serial Ports Com3 Com4 [​IMG]

    Problems with Phisical Serial Ports Com3 Com4 [​IMG]

    :)
     
    dziubym, Jun 18, 2020
    #1

  2. Bluetooth coms fail with duplicate com3 port

    After further testing it would appear that if I create an incoming At Serial port manually then the instrument will connect and transfer data, which is a significant improvement.

    However the process is not straight forward -:

    Start app & Check ports => 1x com3

    Open settings => bluetooth and other devices.

    Pair instrument

    check "Bluetooth settings" > com ports (Com3 & Com4)

    Check ports in app: 2xcom3 and 1x com4

    Try to connect from app=> none of ports will connect

    go to "Bluetooth settings" & delete all com ports (1xcom3 and 1x com4)

    Create incoming port => creates 1x com3 incoming serial.

    Goto app => displays 2xcom3

    App connects using first com3

    I will try to streamline this.

    The pairing process clearly does not create com ports that work. But why should a manually-created port work?
     
    Stephen_Ford, Jun 18, 2020
    #2
  3. Bluetooth coms fail with duplicate com3 port

    OK, I can make a connection but there are com ports left in the wake of the process which dont work and which have to be removed by hand... and that includes editing the registry - so that can't be right.

    So I am back asking the question what is happening in the sequence below which is not supposed to be... and why is that? Appologies but it's a hell of a long process to get to the errors - but that's what Ive been left fighting with...

    The instrument is called a Kane

    The aim of this testing is to see if the PC and Kane can be turned on, connected, turned off, turned on and connected again - without fuss. On my old XP pc I can do this successfully all day. With my win10 PC I have to edit the registry...

    Unpair device

    Com ports disappear from BT Settings

    Regedit

    Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\COM Name Arbiter = 0

    Computer\HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\SERIALCOMM shows 2xcom3 (which must be wrong...?)

    Delete 2x com3

    Reboot

    Switch on Kane

    Run app

    No com ports

    connect

    no com ports

    Devices and printers (this has worked in the past)

    Add device

    No Kane

    BT & Other devices

    Add BT device

    Select Kane

    connect

    2x connection msgs

    Done

    More BT options

    com ports tab

    Note com3 & com4 AT serial

    App

    select com4

    connect

    success

    save data

    success

    disconnect

    close

    shut down Kane

    reboot pc

    log in to pc

    Switch on kane

    BT & other devices

    More BT options

    Settings

    com ports

    Note com3 & com4 AT serial

    cancel

    select kane

    dialogue shows "paired"

    App

    com3 & com4 available

    select com4

    connect

    add device msg from windows

    add

    Dialogue shows "connection failed..." WHY?

    BT & other devices

    More BT settings

    delete com3/4

    add com3 outgoing AT serial

    app

    only com3 showing

    select com3

    connect

    select "add"

    Pair device msg - connection failed - WHY?

    close

    BT & other devices

    select Kane and unpair

    Select add bt device

    select kane

    connect

    dialogue shows "paired"

    BT settings show com3 AT serial and com4

    app

    now 2xcom3 +com4

    select both com3s in turn and get "Port not functioning" for both, WHY?

    I can now begin at the top of this process and edit the registry to remove the duplicate com ports.
     
    Stephen_Ford, Jun 18, 2020
    #3
  4. Problems with Phisical Serial Ports Com3 Com4

    Yellow ! next to Prolific USB-to-Serial Com Port (COM3)

    I have upgraded my HP Pavilion g6-2332 SA Laptop to Windows 10.1 and when I connect a HooToo 7 Port USB 3.0 Hub to the Laptop a Yellow
    ! appears next to the "Prolific USB-to-Serial Com Port (COM3)" entry in Device Manager after the "USB-to-Serial" Port Driver files have finished installing.
     
    John Andrew Davis, Jun 18, 2020
    #4
Thema:

Problems with Phisical Serial Ports Com3 Com4

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