National Instruments CAN 372139B-01 - Manual (Page 45)

Chapter 5 Automotive Diagnostic Command Set API for LabVIEW
© National Instruments Corporation 5-19 Automotive Diagnostic Command Set User Manual
Diagnostic Service.vi
Purpose
Executes a generic diagnostic service. If a special service is not available through the
KWP2000, UDS, or OBD service functions, you can build it using this VI.
Format
Input
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.
require response? indicates whether a diagnostic service expects a
response (TRUE) or not (FALSE). In the latter case, error code is returned
as 0, and data out as an empty array.
data in defines the diagnostic service request message sent to the ECU as
a stream of bytes.
error in is a cluster that describes error conditions occurring before the VI
executes. If an error has already occurred, the VI returns the value of the
error in cluster to error out.
status is TRUE if an error occurred. This VI is not executed when
status is TRUE.
code is the error code number identifying an error. A value of 0
means success. A negative value means error: the VI did not
execute the intended operation. A positive value means warning:
the VI executed intended operation, but an informational warning
is returned. For a description of the code, wire the error cluster to
a LabVIEW error-handling VI, such as the Simple Error
Handler.
source identifies the VI where the error occurred.