National Instruments CAN 372139B-01 - Manual (Page 58)

Chapter 5 Automotive Diagnostic Command Set API for LabVIEW
Automotive Diagnostic Command Set User Manual 5-32 ni.com
KWP2000 Services
ClearDiagnosticInformation.vi
Purpose
Executes the ClearDiagnosticInformation service and clears selected Diagnostic Trouble
Codes (DTCs).
Format
Input
DTC descriptor is a cluster that describes the DTC records the ECU
delivers:
DTC Byte Length indicates the number of bytes the ECU sends
for each DTC. The default is 2.
Status Byte Length indicates the number of bytes the ECU sends
for each DTC’s status. The default is 1.
Add Data Byte Length indicates the number of bytes the ECU
sends for each DTC’s additional data. Usually, there is no
additional data, so the default is 0.
Byte Order indicates the byte ordering for multibyte items:
0: MSB_FIRST (Motorola) (default)
1: LSB_FIRST (Intel)
The DTC descriptor is given here as a parameter basically to convert the
group of DTC parameter to a binary representation according to DTC
Byte Length and Byte Order.
diag ref in specifies the diagnostic session handle, obtained from Open
Diagnostic.vi and wired through subsequent diagnostic VIs. Normally, it is
not necessary to manually manipulate the elements of this cluster.