National Instruments CAN 372139B-01 - Manual (Page 264)

Chapter 6 Automotive Diagnostic Command Set API for C
Automotive Diagnostic Command Set User Manual 6-100 ni.com
ndUDSReportSupportedDTCs
Purpose
Executes the ReportSupportedDTCs subfunction of the UDS
ReadDiagnosticTroubleCodeInformation service. Reads all supported Diagnostic Trouble
Codes (DTCs).
Format
long ndUDSReportSupportedDTCs(
TD1 *diagRef,
TD3 *DTCDescriptor,
unsigned char *statusAvailMask,
TD4 DTCs[],
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.
DTCDescriptor
A struct that describes the DTC records the ECU delivers:
typedef struct {
long DTCByteLength;
long StatusByteLength;
long AddDataByteLength;
unsigned short ByteOrder;
} TD3;
DTCByteLength indicates the number of bytes the ECU sends for each DTC. The
default is 3 for UDS.
StatusByteLength indicates the number of bytes the ECU sends for each DTC’s
status. The default is 1.
AddDataByteLength indicates the number of bytes the ECU sends for each DTC’s
additional data. Usually, there are no additional data, so the default is 0.