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Problems with latest Prolific USB-to-serial comm port driver

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  • Ryan
    replied
    Fix Found

    I found this online and it seemed to fix the problem. Depending on your system you might only need to take a few of these steps. Others will need to do it all. But it works! Close to Serial's suggestion (see above posts).

    From http://www.edaboard.com/thread273835.html:

    I thought it worth pasting here, since possibly many people use USB-Serial converters. I have several different types, and the PL2303 ones don't work on Win7 64-bit. Maybe they are not "genuine" PL2303 chips inside. Mine were purchased from Maplin UK.

    Anyway, the root of the problem is that the most recent drivers are incompatible with some of the PL2303 USB Serial converters, and the older (working) driver cannot be found on official sites (maybe to encourage people to purchase new USB to Serial interfaces).

    First step is to uninstall from Device Manager if you have already plugged in the device. The drivers that you need can be found via google; search for a file called
    PL2303_Prolific_GPS_AllInOne_1013.exe (file size was 3,052,939 bytes).
    EDIT:Here is a link to the file: http://www.2shared.com/file/gCv40U0S...llinone_1.html
    Once found, double-click to install. After installing, the PL2303 USB Serial converter _may_ work on Windows 7.

    If you still get an error marker against the device in Device Manager (and possibly an Error code 10 if you look at the properties of the device) then the problem is, that Windows is still loading the incorrect driver.

    The trick to getting it to operate is a little convoluted but it works:
    Firstly, confirm the symptom by looking at the Driver settings in the Device Manager. If the Driver Version is higher than 3.3.2.105, then Windows is picking up a more recent driver.
    To solve this, you need the help of a text editor that can "Find in Files". An example is UltraEdit. Use the editor (or an alternate method) to search for all *.inf files in C:\Windows\inf that have the following text inside them "Prolific USB-to-Serial". My search found two files; one was called oem42.inf and the other was called oem43.inf. The numbers will vary.
    Inspect the files in a text editor. In my case, the oem42.inf file was the culprit; it contained this text on around line 12: DriverVer=11/12/2012,3.4.42.258 The oem43.inf was the result of installing the
    PL2303_Prolific_GPS_AllInOne_1013.exe software, and it had this correct text:
    DriverVer=10/27/2008,3.3.2.105
    So, I needed to disable the oem42.inf file because it refers to the more recent driver that doesn't work. The easiest way to disable it is to change the filename from oem42.inf to oem42_inf_backup (without the .inf suffix).
    After that, plug in the USB Serial converter, and the correct .inf file will be used to install the driver. Success.

    USB SHUTDOWN ISSUE:
    Go to the USB root hub in device management>right click>properties>advanced> uncheck 'allow to turn off to save power'

    Leave a comment:


  • Aksor
    replied
    I got so fed up that I bought a 3.3V rs232 level converter from Sparkfun Electronics and converted it back to a plain RS232 interface.

    Works like a charm and no driver required.

    Leave a comment:


  • gearyt
    replied
    would you believe... it was as easy as hit "roll back driver"... go figure

    Leave a comment:


  • gearyt
    replied
    downloaded from above site, got 3.4.36.247
    but shows error code 10
    upped ver memory, but what is "quota" ? and how do I up ?
    running 16 gig...

    Leave a comment:


  • renaatdb
    replied
    thanks
    renaatdb

    Leave a comment:


  • prnorton
    replied
    Prolific Latest Driver

    I found the 3.4.42.258 version dated 11/12/2012 at the following web site:

    http://www.driverhive.com/driverdeta...rial+Comm+Port

    Hope this helps

    ~~Phil~~

    Leave a comment:


  • renaatdb
    replied
    Where do I find this driver? mine is 3.4.36.247 26/07/12
    I dit the latest win7 64bit update
    renaatdb

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  • prnorton
    replied
    New driver 3.4.42.258

    Just checked my driver since I remembered a recent update. The version is 3.4.42.258 dated 11/12/2012 and works fine on my windows7 64 bit machine. Maybe this version has solved some of the recent problems.

    Leave a comment:


  • zakrzep
    replied
    I had several issues as well installing the drivers. I ended up following the instructions and using the drivers here. This worked for all of my Prolific USB-Serial adapters including current cost. I am on Windows 2008 64-bit.

    http://www.ifamilysoftware.com/news37.html
    Last edited by zakrzep; October 2nd, 2012, 11:22 AM.

    Leave a comment:


  • Rupp
    replied
    Do the ones list here not work?
    http://store.homeseer.com/store/Powe...-P903C205.aspx

    Look for the Driver Installer (all OS's) link.

    Leave a comment:


  • rmasonjr
    replied
    Originally posted by gearyt View Post
    HELP !!! where can I find the driver ? all I find is the new one which will not work

    Thanks
    Geary
    I have the original install from the screenshot above - I can put it on my dropbox, just let me know...

    Leave a comment:


  • gearyt
    replied
    HELP !!! where can I find the driver ? all I find is the new one which will not work

    Thanks
    Geary

    Leave a comment:


  • Guest's Avatar
    Guest replied
    I made an update of my driver to install that version 3.4 under windows 7 64bit.
    This version is a problem.
    I uninstall the driver.
    I deleted the file C: \ Windows \ System32 \ drivers \ ser2pl64.sys (version 3.4).
    In this way Windows does not reinstalled this version.
    I installed version 3.0.10.
    It works!!!

    Leave a comment:


  • Guest's Avatar
    Guest replied
    prolific

    Hi,
    I have the problem from one day.
    I have windows 7 64-bit and Windows XP 32-bit and this is the same problem.
    I am looking for a solution.
    It's still weird!
    it should be updated.

    Leave a comment:


  • pbibm
    replied
    I check the sites including prolific for updates and apply them directly from the manufacturer. I have 3.4.36.247 as well I updated in July and its worked fine.

    Sometimes the enumerator (Com 1, 2, 3) doesn't stick. So it may have been com3 originally but changed to com7 or something else. You will want to check all of the settings in in device manager (especially advanced settings) when you upgrade. I don't recall these changing specifically for prolific but it has happened to me in the past when updating drivers in general

    Leave a comment:

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