COMPARAM-SPEC and COMPARAM SUBSET

While the parameters describe the diagnostic services within the Diagnostic-layer container, you will find the communication parameters, ie, the actual communication protocol within the Comparam-Spec and then allocated according to the ISO layer on Comparam subsets, ie subsets of the parameters.

Communication parameters - COMPARAM-SPEC

Usual typically is a record for the application layer, ie for the actual diagnostic services, one set for the transport layer, for example ISOTP and a third set for the data link and physical layer. Here, for example, the CAN bit rate is specified. From the Diag-layer container is the appropriate protocol stack referenced and from there the corresponding Comparam subsets.

Communication parameters - COMPARAM-SPEC (schedule)

Here again the main features of the COMPARAM-SPEC:

• Provides for the run-time system information about the communication protocol

• The parameters are separated according to ISO / OSI layers into single-COMPARAM SUBSET stored, which are combined to form a protocol stack (STACK-PROT)

• Example:

  • Physical Layer (ISO 11898 CAN): Baud rate, CAN-ID, wake-up pattern, etc.

  • Transport Layer (ISO 15 756): Flow Control, etc.

  • Application Layer (ISO 14229 UDS): Number of retries etc.

• DIAG-LAYER CONTAINER referenced on the applicable for the ECU-PROT STACK

• Communication parameters can be overridden on several occasions to service level, see table.

COMPARAM-SPEC - Inheritance