Diagnostic Software for VW-Audi Group Cars

 
881 Sumneytown Pike, Lansdale PA 19446, USA

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                        Virtual COM Port Drivers

Virtual COM Port Drivers for Ross-Tech USB Interfaces

All Ross-Tech interfaces can be set to power up as "dumb pass through" interfaces.  Hence our our Serial interfaces are compatible with a wide variety of third-party applications which expect a "pass-through" serial interface.    However, our USB interfaces present additional challenges.    Early in their development, we found a number of technical advantages to using a "direct" USB driver which bypasses the Windows Serial drivers entirely.   Hence the USB drivers that ship with VCDS do not emulate a serial port and cannot be used with applications that expect to communicate via a serial port.  

In order to facilitate the use of third-party applications which expect to communicate with a serial interface, drivers that emulate a COM port are available.  However, anyone thinking about using them needs to be aware of the following points:

  • We do not offer installation support for these drivers. They should be used only by someone who is competent/comfortable installing (and possible uninstalling) USB drivers on his PC.

  • We cannot offer any support for third-party software, nor any guarantee that it will work correctly with these drivers. Of course, the same would apply with a serial interface as well.

  • Any third-party software developer who wants their software to work with our USB interfaces is welcome to contact us for technical info. It is not particularly difficult to add support for the "Direct" drivers that ship with VAG-COM to any such application. The developers of the three of the most popular third-party "tuning" apps all already have this info (most of them for several years).  Why they have not bothered to make their applications compatible with the "Direct" drivers is a question we cannot answer.

That said, here some installation notes:

  • These drivers are compatible with Windows 2000 and newer.   They should work with W2K, XP-32, XP-64, Vista-32 and Vista-64.    We do not have any VCP drivers for Windows 98!

  • Unzip the contents of the download into a new folder.

  • With an interface plugged in, find it in Device Manager, right-click it, and select Update Driver.

  • Depending on what drivers your system already has installed, you may have to "force" these by telling the wizard not to search, but to let you specify what driver to install, then doing the Have Disk and Browse thing.

  • There's also the possibility that the Virtual COM Port won't install  automatically. We've found no real pattern why it does on some systems and not on others. If it does not, find the interface in Device > Manager. The name should show "... with VCP". Open the properties sheet, click the Advanced tab, and make sure Load VCP is checked. Once checked, disconnect and re-connect the interface.

  • Once the USB Serial Port is installed, you may need to change the COM Port Number (depending on how high a number the applications supports).  Device Manager, Properties sheet for the USB Serial Port, Port Settings tab, Advanced button. The COM Port Number may change if you plug the interface into a different USB port, so I'd recommend always using the same USB port.

  • VCDS should continue to work fine with these drivers installed. Leave VCDS set to USB, not a Virtual COM Port!

Assuming you've read and understand all of the above, you can download the "Virtual COM Port" drivers here:


Home 
    Products   
        VCDS
            Product Information
                Interfaces
                   
TWIN-USB   KII-USB   HEX-USB+CAN
                        Virtual COM Port Drivers