National Instruments CAN 372139B-01 - Manual (Page 275)

Chapter 6 Automotive Diagnostic Command Set API for C
© National Instruments Corporation 6-111 Automotive Diagnostic Command Set User Manual
ndUDSWriteDataByIdentifier
Purpose
Executes the UDS WriteDataByIdentifier service. Writes a data record to the ECU.
Format
long ndUDSWriteDataByIdentifier(
TD1 *diagRef,
unsigned short ID,
unsigned char dataIn[],
long len,
LVBoolean *success);
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.
ID
Defines the identifier of the data to be read. The values are application specific.
dataIn
Defines the data record written to the ECU. If you know the record data description, use
ndConvertFromPhys to generate this record.
len
Must contain the number of valid data bytes in dataIn .
Output
success
Indicates successful receipt of a positive response message for this diagnostic service.
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.