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Chapter 6 Automotive Diagnostic Command Set API for C
Automotive Diagnostic Command Set User Manual 6-14 ni.com
Output
dataOut
Points to the byte array to be filled with the binary representation of value.
len
On input, len must contain the dataOut array length. On return, it contains the number
of valid data bytes in the
dataOut array.
Description
Data input to diagnostic services (for example, ndWriteDataByLocalIdentifier) is
usually a byte array of binary data. If you have the data input description (for example, byte
3 and 4 are engine RPM scaled as .25 *
×
RPM in Motorola representation), you can use
ndConvertFromPhys to convert the physical value to the byte stream by filling an
appropriate
typeDescriptor struct.
ndConvertFromPhys converts only the portion specified by one type descriptor to a binary
representation. If your data input consists of several values, you can use
ndConvertFromPhys multiple times on different parts of the byte array.