A number of different types of networks may be present in the vehicle, such as CAN-A and CAN-B at different speeds, LIN bus en MOST bus. These networks cannot simply be linked together. The light signals of the MOST bus can of course not be seen by the CAN bus and the two CAN bus networks cannot communicate with each other due to the speed difference.
Nevertheless, it is possible that the car can be read, whereby diagnostic equipment connects to the control units in all networks in the car. The gateway makes this possible. The gateway is also known as the “node” of all networks in the car. An example of this can be seen in the image below.
All networks are connected to the gateway. This translates, as it were, the information between the different networks. In this way all control units can still communicate with each other and the readout computer can connect to all networks. The OBD connection is therefore also connected to this. The readout computer can access all networks in the car via the gateway.
The gateway (shown in the image to the right) is usually built in behind or below the dashboard.