National-instruments CAN 372139B-01 User Manual download pdf (Page 133)

Chapter 5 Automotive Diagnostic Command Set API for LabVIEW

UDS RequestSeed.vi

Purpose

Executes the UDS SecurityAccess service to retrieve a seed from the ECU.

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.

access mode indicates the security level to be granted. The values are

application specific. This is an odd number, usually 1.

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.

Output

diag ref out is a copy of diag ref in. You can wire it to subsequent

diagnostic VIs.

seed out returns the seed from the ECU.

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National-instruments CAN 372139B-01 User Manual Page 133