1 Diagnostics Project Introduction Matt Morgan

2 Diagnostic ’ s Project Purpose Develop the Network layer services for diagnostics on CAN for road vehicle applications

3 The CAN Protocol Stack Application Layer Network Layer Data Link Layer Physical Layer

4 The CAN Frame This is the basic unit of data transfer on the CAN Only 8 bytes of data per frame

5 The Data Link Layer Responsible for sending and receiving CAN frames Provides error detection and correct sequencing

6 Data Link Layer Services Request Indication Confirm

7 The Network Layer Protocol Data Unit Single Frame First Frame Consecutive Frame Flow Control

8 The Network Layer Sends and receives messages(Service Data Units) to and from the Application Layer. Performs segmentation, re-assembly and flow control as needed. Does not perform routing

9 The Service Data Unit Message Type Length Data Result

10 Network Layer Services Request First Frame Indication Indication Confirm

11 Flow Control When? After FF indication and Block Size number of Consecutive Frames Tells sender to either continue to send or wait

12 Error Detection Sequence Number Unknown PDU Timeouts

13 The End