Help USB to COM port

By leonelvsc ยท 11 replies
Nov 28, 2009
  1. Hi people first than nothing i'm from argentina so my english is poor xD

    Ok here is the problem

    i buy a com to usb adapter (CH340) the problem with this product are the drivers i execute the program with the cd and then i plug in the adapter and windows pops up a window "new hardware found" ok i click install automaticly . But the problems is that windows can't install those drivers i don't now why :S .

    I extracted the drivers files to another folder and use manual installation but windows says that "cannot install this hardware " :(

    what i should do ?
  2. LookinAround

    LookinAround Ex Tech Spotter Posts: 6,491   +184

    Please tell us
    > The make/model of your computer
    > What version of Windows are you running and what Service Pack level

    • Make sure all your devices are connected and powered on
    • Click Start->Run, enter: msinfo32. Click the + sign next to Components to expand it
    • Click Problem Devices. Anything appear?
    • If yes, click on it, Ctrl-A to select all, Ctrl-C to copy it, Ctrl-V to paste into next post
  3. leonelvsc

    leonelvsc TS Rookie Topic Starter

    no anything appears :S

    pc specs

    mother ecs c51gm-m
    amd x2 4000
    2gb ram ddr2 800

    windows xp sp3 professional edition
  4. LookinAround

    LookinAround Ex Tech Spotter Posts: 6,491   +184

    ?? Did you have the adapter plugged in when you checked for Problem Devices??? If you have the device plugged in AND windows reports it can't install the driver i'd expect it to appear in Problem devices at that point in time :confused:
  5. leonelvsc

    leonelvsc TS Rookie Topic Starter

    connect to verify but

    windows installs it as unknown device in usb devices
  6. LookinAround

    LookinAround Ex Tech Spotter Posts: 6,491   +184

    Yes, i know Windows says "Unknown Device". But if you check the Problem Device Report at that time (while the adapter is connected) it should provide more information. That's what I want to see.

    For example, you may see something like

    USB\VID_046D&PID_C517\7&2285BC2A&0&2      The drivers for this device are not installed
  7. leonelvsc

    leonelvsc TS Rookie Topic Starter


  8. LookinAround

    LookinAround Ex Tech Spotter Posts: 6,491   +184

    Ahhh.... Thank you for the images.

    That at least helps explain what's happening and part of the problem.. though not necessarily the solution :(

    The current problem is not the driver. I'll explain... Before Windows tries to install the driver it must recognize the hardware correctly The hardware is identified by something called its Hardware ID

    Your Unknown Device shows a hardware ID of USB\VID_0000&PID_0000. But those zero's should not be there! The zero's mean the hardware isn't being recognized correctly.

    It's late here now.. so i will post more information tomorrow. In the meantime, you might try to connect the adapter to another computer. At least determine if you have the same problem with the same bad Hardware ID of all zeroes on a different computer or not.
  9. leonelvsc

    leonelvsc TS Rookie Topic Starter

    and can i change the id "0" for the hardware id contained in the driver?
  10. LookinAround

    LookinAround Ex Tech Spotter Posts: 6,491   +184

    No. Windows needs to see that ID each time the device gets plugged in. (The device sends it to windows as part of the plug and play sequence). Also, it's next to impossible to know everywhere in the registry that ID is used, how it's used and how it's saved. We might even corrupt your registry if we tried to change it by hand.

    I think first best to see if the same problem occurs on a different computer. Then we might know if the problem is the device or with Windows on your computer.

    just for information you might want to see [post=755153]Plug and Play Overview: How Windows Finds Drivers for USB Devices[/post]
  11. leonelvsc

    leonelvsc TS Rookie Topic Starter

    ok thx for your help =)
  12. leonelvsc

    leonelvsc TS Rookie Topic Starter

    I try installing a virtual com device and then install the driver of the product but windows tells me that the driver does not contain information about this device or something like that.
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