Discontinued Ross-Tech Interfaces

Over the years, Ross-Tech has supplied several different Interfaces (the hardware needed to connect a PC to your car) for VAG-COM. One end of the interface plugs into the a Serial (RS232) or USB port on your PC. The other end plugs directly into the OBD-II port present in all 1996 and newer VW/Audi passenger vehicles or into many 1990-1995 (pre OBD-I) cars with an optional 2x2 Adapter.

All of these are good Interfaces that have served their owners well. They have been replaced by newer Interfaces with new features and support for new vehicles, but they all hold a special place in our hearts. :-)

Interface Name	Click each Picture  for more information	For Sale Dates:	Modern Interface?	Opto- couplers?	Works with Lame Ports?	Dual-K?	Acts as a Dongle? Latest Version Supported?
KEY-USB KU		01/2004 - 10/2008	YES	NO	N/A	YES	YES 908
HEX-COM H		11/2002 - 07/2004	YES	NO	YES	YES	YES 908
HEX-USB HU		08/2003 - 07/2004	YES	NO	N/A	YES	YES 908
UNI-COM U		01/2003 - 02/2004	YES	NO	YES	NO	NO 409
TWIN-USB TU		02/2003 - 01/2004	YES	NO	N/A	YES	NO 409
TWIN-COM T		02/2002 - 12/2003	YES	NO	YES	YES	NO 409
BI-COM B		08/2002 - 09/2003	YES	NO	YES	YES	NO 409
MAX-COM M		11/2001 - 11/2002	YES	NO	YES	NO	NO 409
FAST-COM F		11/2001 - 10/2002	YES	NO	YES	NO	NO 409
ISO-COM i		05/2000 - 01/2003	NO	YES	NO	NO	NO 311

Interface Upgrades:   

Our newer interfaces are available as upgrades to all registered VAG-COM users. You can trade in any of the above discontinued Interfaces on one of our current Interfaces. Click this link for more information about Interface Upgrades. 

Audis that require Dual K-Lines: 

• All  B6/8E chassis A4's with Xenon headlights.   

• All 2002 and newer A6 models, including the Allroad.   

Optocouplers:

Found in our ISO-COM Interface and most 3rd party diagnostic interfaces. Interfaces based on Optocouplers are slow and do not produce a clean wave-form on the car's data (K) line. Interfaces based on Optocouplers also have issues when receiving data from the car.

"Difficult" older cars

Include those with 1991-1994 Audi TDI engines which run the diagnostic protocols at 240 (yes, two hundred forty) bits per second,  1993-1994 Audi 2.6L engines with Hella ECU's, as well as any older car that has the "Check Engine" light connected to the L-Line (check wiring diagrams -- we don't have an exact list). 

"Lame Port" laptops

Include many Compaq Presario Laptops, some Acer models, and some ultra-portable Dell models which have the serial port on a separate port expander. 

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