Measurement-computing DBK70 Manual do Utilizador descarregar pdf (Página 69)

DBK70 User’s Manual 928494 Fundamentals of Obtaining Vehicle Data 6-3

The Filter field defines a bit pattern which is compared with network messages. The DBK70 compares

each message on the network with the hexadecimal pattern in the Filter. When a match is found, the

attached data is captured, scaled, and output on the assigned analog output. The Filter is one or more two

byte sets, typically 5 or 6 sets to match the message size. Hexadecimal coding is used. The Filter definition

must contain a 2-byte-set (4 hex characters) for every byte in the message that is to be compared.

A 5 byte message header would require a Filter definition of 10 bytes (20 characters), for example.

The first byte of a 2-byte-set defines the bit-by-bit data values that must be matched by a received message

in order to be passed by the filter and processed by an output channel. The second byte of a 2-byte-set is

a mask byte that defines which bits are to be checked for a match.

1 2 ... 64 65 66 67 68 69 70 71 72 73 74 ... 107 108

Sem comentários

Measurement-computing DBK70 Manual do Utilizador Página 69