# K-line interfaces for connecting the transmission control unit and the PC
A K-line interface (level converter) is required for connecting the transmission control unit to the PC. It is available both with a USB interface and an RS232 (COM) port. If the transmission control unit has been installed in the vehicle, it depends on the vehicle manufacturer whether you need an additional adapter connector in the vehicle or not.
| K-line interface with a serial RS232 (COM) interface
> |  | The K-line interface with the RS232 interface is compatible with the transmission control units E200, E300, E300.1 and the diagnostic software tools DIWAgnosis, DIANA, ALADIN and the Recorder. You can order the K-line interface with a serial interface under the order no.: 151.00152910.
| How to connect the K-line interface with a serial RS232 interface:
> Turn your PC off. Connect the serial RS232 connector (image to the left) to the serial port of your PC (image in the center). Connect the diagnostic connector (image to the right) to the diagnostic port in the vehicle. Depending on the vehicle, you might need an adapter connector. Configure the Recorder for the use of a serial K-line interface. For further information on how to configure the Recorder, please refer to: Recorder setup. If your PC is not equipped with a serial interface, always use the K-line interface with a USB interface. We do not recommend using PCMCIA extension cards, USB to serial adapters etc.
| K-line USB interface
> |  | The K-line USB interface is compatible with the transmission control units E300, E300.1 and the Voith diagnostic software tools DIANA, ALADIN and the Recorder. All connections of the USB interface are protected against wrong polarity connection. Power is supplied via the USB port. An additional power supply unit is not required. You can order the K-line USB interface under the order no.: 151.00202110.
| How to connect the K-line interface with a USB interface:
> First of all, install ALADIN. Connect the USB cable and the diagnostic cable to the K-line USB interface (image to the left). Connect the USB cable to a free USB port on your PC (image in the center). Connect the diagnostic connector (image to the right) to the diagnostic port in the vehicle. Depending on the vehicle, you might need an adapter connector. Once you have connected the K-line USB interface to your PC, install the corresponding Windows driver.
| How to install the driver for the K-line USB interface
> Connect the K-line USB interface to your PC. The Windows Hardware Wizard appears automatically.
> Select the option "No, not this time" and click the "Next" button.
> Select the option "Install from a list or specific location" and click the "Next" button.
> Select the option "Include this location in the search" and click the "Browse" button.
> Navigate to the directory "C:\Program Files\samtec\Configuration\Driver\samtec HS+ Interface USB\W2KXP" and click "OK". This directory has been created automatically during the ALADIN installation.
> Windows installs the drivers for the K-line USB interface.
> Confirm with "Finish" that the installation is complete.
> For further information on the K-line interface with a USB interface, please refer to the Help for the "HS Light USB" product made by samtec.
How to proceed: Recorder program overview and initial start-up
| Further topics:
More information on: Installation / uninstallation More information on: Files used & control units supported More information on: Program overview and initial start-up More information on: K-line interfaces for connecting the ECU and the Recorder More information on: Recorder properties Up > © by Voith Turbo GmbH & Co. KG send remarks to Gottfried.Graf@Voith.com (electronic department) or r.theilacker@voith.com (electronic department)