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
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
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
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"
Virtual COM Port Drivers