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The vehicle protocols are handled directly in the vas ***4a. This ensures fast response times and a reliable real-time behavior independently of the PC operating system. Every time a connection is established, the VAS ***4A software is synchonized with the version installed on the application PC. The VAS ***4A thus automatically adopts any new features provided after a new software version has been installed on the application PC. The diagnostic application and the associated Diagnostic Base System are installed on the application PC. The Diagnostic Base System can access the VAS ***4A via USB. The vehicle protocols are handled directly in the VAS ***4A. This ensures fast response times and a reliable real-time behavior independently of the PC operating system. Every time a connection is established, the VAS ***4A software is synchonized with the version installed on the application PC. The VAS ***4A thus automatically adopts any new features provided after a new software version has been installed on the application PC. The diagnostic application and the associated Diagnostic Base System are installed on the application PC. Access via Bluetooth: After a connection to the VAS ***4A has been set up, the Bluetooth software provides a virtual serial COM port (Bluetooth Serial Port Profile). The Diagnostic Base System uses this COM port to communicate with the VAS ***4A.You need to specify this port when you install the diagnostic application. Access via USB: You can also connect the VAS ***4A to the application PC by using the supplied USB cable. Windows detects the vas ***4a through Plug and Play, and automatically installs the drivers copied when you installed the diagnostic application. Setup of the VAS ***4A is then complete and the device is ready for use by the diagnostic application.