Measurement Computing DBK70 - Manual (Page 79)

DBK70 User’s Manual 928494 Fundamentals of Obtaining Vehicle Data 6-13
The DBK70 Filter field defines a bit pattern, which is compared with the frame header. The DBK70
compares each frame header on the network with the hexadecimal pattern in its Filter field. When a match
is found, the attached data is captured, scaled, and output on the assigned analog output. The Filter field
is one or more two byte sets. Hexadecimal coding is used. The Filter definition must contain a 2-byte-set
(4 hex characters) for every expected byte in the header. An Extended Format Data Frame of 4 bytes would
require a Filter definition of 8 bytes (16 hex characters), for example.
The following diagram shows the alignment of the bytes in the DBK70’s Filter field with the bits in the
Data Frame for Extended CAN Format.
Filter for Extended Frame Format
Filter for Standard Frame Format