National Instruments CAN 372139B-01 - Manual (Page 53)

Chapter 5 Automotive Diagnostic Command Set API for LabVIEW
© National Instruments Corporation 5-27 Automotive Diagnostic Command Set User Manual
Output
diag ref out is a copy of diag ref in. You can wire it to subsequent
diagnostic VIs.
error out describes error conditions. If the error in cluster indicated an
error, the error out cluster contains the same information. Otherwise,
error out describes the error status of this VI.
status is TRUE if an error occurred.
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.
Description
For the VW TP 2.0, you must establish a connection to the ECU before any diagnostic
communication can occur. This VI sets up a unique communication channel to an ECU for
subsequent diagnostic service requests.
Note You must maintain the communication link you created by periodically (at least once
a second) calling VWTP Connection Test.vi .
There is no equivalent for the ISO TP (ISO 15765-2), as the ISO TP does not use a special
communication link.