Measurement Computing DBK70 - Manual (Page 68)

6-2 Fundamentals of Obtaining Vehicle Data 928494 DBK70 User’s Manual
Obtaining Vehicle Data for J1850, ISO 9141, and ISO 14230-4
Reference Note:
Information regarding obtaining vehicle data for CAN, including J1939, begins on page 6-8.
If the desired data is available at an acceptable rate in an operational message then the Message field for
this database record should be blank and the Update Rate field should be defined as 0.
If the desired data is not normally available at an acceptable rate in an operational message and is available
through a diagnostic message then the diagnostic request message must be defined in the Message field and
an Update Rate value that is suitable for obtaining the data must be defined.
Note: The address of the DBK70 (off-board diagnostic tool) can be F1 through FD. The address F1 is used
throughout this document and in the DBK70 database included with the application software.
Each message broadcasted on the network contains a message header field, mode field, PID field, and
a data field. Sometimes the data field is broken down into multiple sub-fields. Messages are typically 5 to
12 bytes in length.
5 byte message format
6 byte message format