The USB interface is provided by an FTDI 232R USB to RS232 chip. I assume that there is some simple circuit preventing me from sending raw data, but I have not had time to figure it out yet. This interface uses an FTDI 232BL USB to RS232 chip to provide the USB interface.Īs far as I can tell this is a dumb interface since there are no micro-controllers inside it, but I have not been able to get it to work for sending raw data. This interface does not transmit data sent to it, so it must require a proprietary KWP2000Plus protocol in order to send and receive messages. This is an intelligent interface that has an AVR Atmel micro-controller inside it.
Running the latest version of VCDS will allow you to change the cable settings for it to default to a dumb cable. If you have trouble communicating over this cable with your software, it is most likely because the cable is in intelligent mode. In dumb mode the cable will transmit any data sent to it, but in intelligent mode you need to known Ross-Tech proprietary protocol to transmit data over the cable. The cable can be configured to default to intelligent mode or dumb mode.
This is an intelligent interface, meaning that the cable has a micro-controller in it that handles a lot of the low level VAG protocols. I will try to add more information later if people are interested. I had some time to inspect a few different data cables.
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