The CAN bus stand for performing experiments was created using original components
from the VW Golf 6. The realistic representation of the components and their connections
is worthy of special mention with this design. In contrast to comparable systems,
no bunch plugs or standardised plug connections are used for the connections between
the original components here. Instead, only original connections from the actual
vehicle are used. This allows the use of original manufacturer documentation and
circuit diagrams, supplied by Volkswagen AG, while also allowing measurements, fault
simulations and diagnostics to be performed in real-world conditions. The function
wall's CAN function box serves as the central interface and also provides additional
connection options for accessories. To facilitate this, the function box includes
10 parallel interfaces for the diagnostic cable, LIN-Bus and all other CAN bus connections,
as well as connections for the accompanying power supply and earth connection. The
supply of the individual components can be monitored on two LEDs. To prevent short-circuit
damage, the parallel connections are also safeguarded with two fuses.
As well as the diagnostic cable, individual 7-pin sub-D sockets are provided for
the CAN and LIN-buses to not only allow the signals to be visualised as voltages
on the CAN bus, but also to be able to export the contents of the CAN messages using
the accompanying control unit addresses (identifiers). When used with a CAN or LIN
interface, these allow the messages to be queried/exported in plain text.
The connection to diagnostic test equipment is established using the 16-pin OBD
connector as per the VAG standard. A voltage-stabilised 12 V switched mode power
supply with sufficient power output (min. 12 Volt 40 Ampere) is recommended for
supplying voltage to the function wall. Alternatively, a 12 V car battery with sufficient
capacity can be used (12 V 60 AH).