National Instruments CAN 372139B-01 - Manual (Page 185)

Chapter 6 Automotive Diagnostic Command Set API for C
© National Instruments Corporation 6-21 Automotive Diagnostic Command Set User Manual
ndDTCToString
Purpose
Returns a string representation (such as P1234) for a 2-byte diagnostic trouble code (DTC).
Format
void ndDTCToString(
unsigned long DTCNum,
char DTCString[],
long *len);
Input
DTCNum
The DTC number as returned in the DTCs structs of ndReadDTCByStatus ,
ndReadStatusOfDTC , ndUDSReportDTCBySeverityMaskRecord ,
ndUDSReportDTCByStatusMask , ndUDSReportSeverityInformationOfDTC ,
ndUDSReportSupportedDTCs , ndOBDRequestEmissionRelatedDTCs , or
ndOBDRequestEmissionRelatedDTCsDuringCurrentDriveCycle .
Note This function converts only 2-byte DTCs. If you feed in larger numbers, the function
returns garbage.
Output
DTCString
The DTC string representation.
len
On input, len must contain the DTCString array length (at least 6). On return, it
contains the number of valid data bytes in the DTCString array.
Description
The SAE J2012 standard specifies a naming scheme for 2-byte DTCs consisting of one letter
and four digits. Use
ndDTCToString to convert the DTC numerical representation to this
name.