National Instruments CAN 372139B-01 - Manual (Page 262)

Chapter 6 Automotive Diagnostic Command Set API for C
Automotive Diagnostic Command Set User Manual 6-98 ni.com
ByteOrder indicates the byte ordering for multibyte items:
0: MSB_FIRST (Motorola), default
1: LSB_FIRST (Intel)
This function interprets the response byte stream according to this description and
returns the resulting DTC records in the
DTCs struct array.
Output
statusAvailMask
An application-specific value returned for all DTCs.
DTCs
Returns the resulting DTCs as an array of structs:
typedef struct {
unsigned long DTC;
unsigned long Status;
unsigned long AddData;
} TD4;
DTC is the resulting Diagnostic Trouble Code. For the default 2-byte DTCs, use
ndDTCToString to convert this code to readable format as defined by SAE J2012.
Status is the DTC status. Usually, this is a bit field with following meaning:
Bit Meaning
0 testFailed
1 testFailedThisMonitoringCycle
2 pendingDTC
3 confirmedDTC
4 testNotCompletedSinceLastClear
5 testFailedSinceLastClear
6 testNotCompletedThisMonitoringCycle
7 warningIndicatorRequested
AddData contains optional additional data for this DTC.
len
On input, len must contain the DTCs array length in elements. On return, it contains the
number of valid elements in the DTCs array.
success
Indicates successful receipt of a positive response message for this diagnostic service.