National Instruments CAN 372139B-01 - Manual (Page 199)

Chapter 6 Automotive Diagnostic Command Set API for C
© National Instruments Corporation 6-35 Automotive Diagnostic Command Set User Manual
ndVWTPDisconnect
Purpose
Terminates a connection channel to an ECU using the VW TP 2.0.
Format
long ndVWTPDisconnect(
TD1 *diagRef);
Input
diagRef
Specifies the diagnostic session handle, obtained from ndOpenDiagnostic and passed
to subsequent diagnostic functions. Normally, it is not necessary to manually manipulate
the elements of this struct.
Output
Return Value
The return value indicates the function call status as a signed 32-bit integer. Zero means the
function executed successfully. A negative value specifies an error, which means the function
did not perform the expected behavior. A positive value specifies a warning, which means the
function performed as expected, but a condition arose that may require attention.
Use the ndStatusToString function to obtain a descriptive string for the return value.
Description
For the VW TP 2.0, you must disconnect the ECU connection link to properly terminate
communication to the ECU. This function sends the proper disconnect messages and unlinks
the communication.
Use ndVWTPConnect the create a new connection to the same ECU.
There is no equivalent for the ISO TP (ISO 15765-2), as the ISO TP does not use a special
communication link.