Defining Diagnostic LIN Schedule

[alemberskiy]

Hi everyone,

In the XNET example for diagnostic frames, the diagnostic schedule is switched back and forth between master request and slave response using LIN Diagnostic Change VI.

I'm trying to define database in memory and while I created schedules for Frame Out Queued and Frame In Stream sessions with corresponding schedule entries containing master request and slave response messages, when running XNET Write (LIN Diagnostic Change), I get the following error: 

NI-XNET: (Hex 0xBFF6318F) A LIN diagnostic schedule change requires the diagnostic schedule to be defined in the database. Solution: Define the diagnostic schedule in the database.

My question is: what makes the schedule a "diagnostic" schedule? More specifically: how do I define the diagnostic schedule in the memory?

Since my program runs well when using the database file, and it contains a bunch of schedules, how does it know which one is "diagnostic" schedule?

Thank you in advance.

[ZYOng · Accepted solution]

Your question is best to be posted at Automotive and Embedded Networks board.

what makes the schedule a "diagnostic" schedule? More specifically: how do I define the diagnostic schedule in the memory?

• Their IDs are either 60 (0x3C) for a Master Request frame or 61 (0x3D) for a Slave Response frame.
• Master Request schedule is defined by adding a schedule to the LDF that only includes the Master Request frame. Slave Request schedule is also defined by adding a schedule that only includes the Slave Response frame.

Reference: Error -1074384497 (Hex 0xBFF6318F) Occurred at XNET Write (State LIN Diagnostic Schedule Change).vi

[rolfk · Accepted solution]

ZYOng more or less already explained it. While the LDF file format allows for explicit Diagnostic message definitions under the section Diagnostic_frames, the NI XNET software does not seem to make use of that part of the LDF file automatically. Instead you have to explicitly add two extra schedules called MasterReq and SlaveResp (or whatever your frames in the Diagnostic_frames section are called).