Response Data Length

The LIN response data length is the number of data fields (bytes) of the response excluding the checksum.

The response data length can either be configured by the user or be defined automatically by bits 4 and 5 of the Identifier (compatibility to LIN Specification 1.1). The user can choose between these two modes using the US_LINMR.DLM:

• DLM = 0: The response data length is configured by the user via US_LINMR.DLC. The response data length is equal to (DLC + 1) bytes. DLC can be programmed from 0 to 255, so the response can contain from 1 data byte up to 256 data bytes.
• DLM = 1: The response data length is defined by the Identifier (US_LINIR.IDCHR) according to the table below. The US_LINMR.DLC is discarded. The response can contain 2 or 4 or 8 data bytes.

  Table 1. Response Data Length if DLM = 1

  IDCHR[5]	IDCHR[4]	Response Data Length [Bytes]
  0	0	2
  0	1	2
  1	0	4
  1	1	8

  Figure 1. Response Data Length