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Media interface function - GF82.60-P-2020CEA

MODEL 204.0/2/3/9 as of model year 2013 with CODE 518 (Media interface) 

Function requirements for media interface, general 

Media interface, general 

The media interface function is also called a Universal Consumer Electronic Interface (UCI). The media interface allows portable terminals to be connected to the audio equipment using the relevant adapter cable, the media interface electrical connector (X1870), the media interface control unit (N1251) and the Media Oriented System Transport (MOST).

Three different adapter cables are included ex-factory (in the glove compartment):

IMPORTANT The media interface electrical connector is located in the stowage compartment (telephone compartment) underneath the center armrest. The AUX connection electrical connector (X39/45) (up to 31.5.2013)) installed as standard is discontinued.

An AUX connection (up to 31.5.2013) and two different USB interfaces are available for connecting the portable terminals.

The USB interfaces support the following devices and standards:

IMPORTANT iPods are also connected via a USB interface.

IMPORTANT If an attempt is made to connect a USB memory stick using the adapter cable for USB devices, the following message appears on the Audio/COMAND display (A40/8): "Note: Please connect the device to the other USB port". The USB electrical connector (X115) for connecting USB memory sticks is also located in the stowage compartment (telephone compartment) under the center armrest.

Devices connected via a USB port (including iPods) can be operated with the following controls:

IMPORTANT Menu navigation is accomplished on the Audio/COMAND display and it is dependent on the specific portable terminal connected.

AUX devices must be operated on the device itself.

IMPORTANT With the "AUX" audio source, "Standard" and "Boost" can be selected in the "Volume" menu. The input level can be increased by selecting "Boost".

Media database 

Metadata is stored in the connected device in addition to the actual media files. This metadata is collected by the media interface control unit in a store, the media database. It is then possible to search for the relevant metadata in this store. Metadata includes, for example, the title, interpreter, composer, album, genre, audio book, podcast, file identifier, file type (audio or video).

The media interface control unit permanently stores the metadata of up to three devices. When one of these devices is reconnected, the metadata is updated. As soon as a fourth device is connected, the oldest set of metadata is overwritten.

Cover art 

When playing pieces of music, the corresponding cover art is shown on the Audio/COMAND display if the cover art in question is stored in the portable terminal (e.g. iPod).

The maximum file size for processing cover art is 5 MB. The media interface control unit adapts the resolution to 240240 pixels, 16 bit colors and converts the file to JPG format.

Function sequence for media interface 

The media interface control unit is supplied with voltage via two direct lines (circuit 31 and circuit 30). If a portable device is connected, it is recognized by the media interface control unit via the following route:

The media interface control unit then sends a signal to the audio equipment, which changes to the connected source in the case of devices connected via a USB port (but not AUX devices). The user can now display the audio data or video data on the Audio/COMAND display by selecting the "Media Interface" menu item as well as the specific submenu item ("Normal Track Sequence", "Track List Mix", "Medium Mix").

The "Media interface" menu item and the specific submenu item can be selected using one of the following controls:

The control signals from the buttons on the "Audio equipment" are processed internally.

The control signals for the Audio/COMAND control panel are forwarded over the telematics CAN (CAN A) to the audio equipment, on model 204.0/2/3 with code (255) AMG Performance Media over the AMG Performance Media control unit (N125/3).

The control signals of the multifunction steering wheel button groups are forwarded to the "audio equipment" via the following route:

The voice signals for operation through VCS (with code (512) COMAND APS with DVD changer or code (527) COMAND APS with single DVD drive (with navigation)) are forwarded by the hands-free system microphone (A67b1) to the audio equipment.

Following the evaluation of the control signals, the audio equipment forwards the control signals to the connected portable terminal via the following route:

The connected portable terminal evaluates the control signals and sends the corresponding audio signals and data to the audio equipment via the reverse route.

On vehicles with code (810) Sound system, the audio output is sent by the audio equipment over MOST to the sound system amplifier control unit (N40/3). The audio signals are amplified by the sound system amplifier control unit and they are emitted over the speaker system.

On vehicles without code (810) Sound system, the audio equipment emits the audio signals over the speaker system via direct lines.

IMPORTANT More detailed information on the speaker system is available in the "Speaker output function" document.

In vehicles with code (512) COMAND APS with DVD changer or with code (527) COMAND APS with single DVD drive (with navigation), video signals and data are forwarded from the media interface electrical connector directly to the COMAND controller unit (A40/3) over a coaxial cable.

The COMAND controller unit processes the video signals and data internally, and forwards them over a low voltage differential signal (LVDS) line to the Audio/COMAND display, on model 204.0/2/3 with code (255) AMG Performance Media over the AMG Performance Media control unit.

IMPORTANT Video files on iPods can be selected and played using the vehicle controls. Video-compatible devices connected via AUX must be operated on the device itself.

  Electrical function schematic for media interface function   PE82.85-P-2059-97FAB
  Overview of system components, telematics   GF82.85-P-9999CE
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