National Instruments CAN 372139B-01 - Manual (Page 292)

Chapter 6 Automotive Diagnostic Command Set API for C
Automotive Diagnostic Command Set User Manual 6-128 ni.com
ndOBDRequestVehicleInformation
Purpose
Executes the OBD Request Vehicle Information service. Reads a set of information data from
the ECU.
Format
long ndOBDRequestVehicleInformation(
TD1 *diagRef,
unsigned char infoType,
unsigned char *nItems,
unsigned char dataOut[],
long *len,
LVBoolean *success);
Input
diagRef
Specifies the diagnostic session handle, obtained from ndOpenDiagnostic and passed
to subsequent diagnostic functions. Normally, it is not necessary to manually manipulate
the elements of this struct.
infoType
Defines the type of information to be read. The SAE J1979 standard defines the values.
Output
nItems
The number of data items (not bytes) this service returns.
dataOut
Returns the ECU vehicle information. You can obtain the description from the
SAE J1979 standard.
len
On input, len must contain the dataOut array length. On return, it contains the number
of valid data bytes in the dataOut array.
success
Indicates successful receipt of a positive response message for this diagnostic service.