This protocol covers the application layer in the OSI model of computer networking. KWP also covers the session layer in the OSI model, in terms of starting, maintaining and terminating a communications session. One underlying physical layer used for KWP is identical to ISO , with bidirectional serial communication on a single line called the K-line. In addition, there is an optional L-line for wakeup.
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This part of ISO specifies the requirements for the Keyword Protocol data link on which one or several on-vehicle Electronic Control Units are connected to an off-board tester in order to perform diagnostic functions. The vehicle environment to which this part of ISO applies may consist of a single tester that may be temporarily connected to the on-vehicle diagnostic data link and several on-vehicle Electronic Control Units connected directly or indirectly see figure 2.
This part of ISO specifies the requirements of the implementation of the Diagnostic Services specified in ISO , including byte-encoding and hexadecimal values for the service identifiers; byte-encoding for the parameters of the diagnostic service requests and responses; hexadecimal values for the standard parameters.
Keyword Protocol 2000