The default status of the lin bus is sleep. These slots are coordinated by the LIN master. Diagnostic LIN Frame. Sporadic LIN Frame. Figure 3: Example of LIN frame. Similar to unconditional frames, event-triggered frames begin with the master task transmitting a frame header. There are three different ways of transmitting frames on the bus: unconditional, event triggered, and sporadic frames. LIN version 2.0 included a number of optional frame types that make the network more flexible. It is sent only when the master task knows that it will be received. The diagnostic frame is used to find the fault in a LIN network by using the Transport Layer (TP). Unconditional Frames. LIN stands for Local Interconnect Network. Additionally, the LIN schedule is included in the description file, which determines the time-triggered communication process of the LIN bus. See Figure 13 as a reference. LIN scheduling. This is the “normal” type of LIN communication. Functionality. Collision is avoided by the master schedule tables. Like unconditional, event triggered and sporadic frames, the two diagnostic frames are composed of a Frame Header and a Frame Response. LIN can be used to communicate with non-critical sub-systems such as: door-lock driver and window motors. LIN frame format In addition to the unconditional frames (frames sent whenever scheduled according to the schedule table) provided by LIN 1.3, LIN 2.0 introduces event-triggered frames and sporadic frames. However the master can either do sporadic or do continous quering. all the frame types specified by the LIN consortium, i.e. Advanced Frame Types. A slave response frame is used as a diagnostic response. Specs from the Lin Consortium The LIN 2.0 Specification further classifies LIN frames into six types (unconditional, event triggered, sporadic, diagnostic, user-defined, and reserved). It is important to note that the differences in these frame types are due to either the timing of how they are transmitted or the content of the data bytes. I am not in a position to put out the money for a star studded gaming rig. A sporadic frame cannot be party to a collision because it is transmitted by the master only as required. This collision avoidance is a great thing about LIN Bus because it means conversations can happen … Figure 13- Unconditional frame definition The purpose of the sporadic frame is to blend some dynamic behavior into the deterministic and real-time focused schedule table without losing the determinism in the rest of the schedule table. As for the signal definition, to define an unconditional frame the button must be pressed and the following window must be configured. This process is deterministic – for every frame transmitted on the bus, exactly determined time windows are available (“frame slots”). 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