Measurement-computing DBK70 Uživatelský manuál stáhnout pdf (Strana 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

1 2 ... 74 75 76 77 78 79 80 81 82 83 84 ... 107 108

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Measurement-computing DBK70 Uživatelský manuál Strana 79