National Instruments CAN 372139B-01 User Manual
Page 274
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Chapter 6
Automotive Diagnostic Command Set API for C
Automotive Diagnostic Command Set User Manual
6-110
ni.com
The TesterPresent service is this “keep alive” signal. It does not affect any other ECU
operation.
Keep calling
ndUDSTesterPresent
within the ECU timeout period if no other service is
executed.
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