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Chapter 6 Automotive Diagnostic Command Set API for C
Automotive Diagnostic Command Set User Manual 6-32 ni.com
ndVWTPConnect
Purpose
Establishes a connection channel to an ECU using the VW TP 2.0.
Format
long ndVWTPConnect(
TD1 *diagRef,
unsigned long channelID,
unsigned char applicationType);
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.
channelID
Defines the CAN identifier on which the ECU responds for this connection. The ECU
defines the ID on which the host transmits.
applicationType
Specifies the communication type that takes place on the communication channel. For
diagnostic applications, specify KWP2000 (1). The other values are for
manufacturer-specific purposes.
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.