Uncommon
Unified Diagnostic Services
Diagnostic communication protocol
Unified Diagnostic Services
Unified Diagnostic Services (UDS) is a diagnostic communication protocol used by electronic control units (ECUs) in automotive electronics. UDS is defined by ISO 14229 and evolved from ISO 14230 (KWP2000), which is now largely obsolete. UDS specifies functionality at the session, presentation, and application layers (layers 5–7) of the OSI model. Because of this, it can operate on different physical and data link layers such as CAN (ISO 11898), LIN (ISO 17987), Ethernet (ISO 13400), FlexRay (ISO 17458), and K-Line (ISO 14230). In practice, UDS is most commonly used over CAN via Diagnostic over CAN (DoCAN), defined in ISO 15765. The term "unified" refers to the fact that UDS is an international standard rather than a manufacturer-specific protocol. Today, nearly all Tier 1 suppliers implement UDS in ECUs developed for automotive original equipment manufacturers (OEMs). UDS is also integrated into larger software architectures, including AUTOSAR. Modern vehicles have a diagnostic interface...
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