CAN protocol: Introduction

The CAN bus is a broadcast type of bus. This means that all nodes can “hear” all transmissions. There is no way to send a message to just a specific node; all nodes will invariably pick up all traffic. The CAN hardware, however, provides local filtering so that each node may react only on the...

UDS: Flashing ECU via UDS protocol

As a practical example of the UDS diagnostic services, let us consider the typical structure of a flash programming, as illustrated. The diagnostic tester sends a Growl ReadDataByIdentifier. With this request, it reads the hardware ID and software ID from the controller to see which device it exactly right. Then, the diagnostic tester, the control...