SAE J2728:2020 pdf free

SAE J2728:2020 pdf free.Heavy Vehicle Event Data Recorder (HVEDR)
The data extraction tool comprises the hardware and software used to extract event data from the HVEDR. The main functions of the data extraction tool are to: (1) establish a communication link with the HVEDR memory device (typically using the vehicle’s data port, or directly to a specific ECU), (2) extract event data from the HVEDR, and (3) convert the event data into the SAE J2728-specified format.
Data format conversion is a process performed by the data extraction tool to convert native event data stored in an ECU into standardized SAE J2728-specified event data output.
A data network is a means of communicating between ECUs. The SAE J2728 standard often refers to the network defined by SAE J1939, although others may be used.
The data port is the physical connector through which the data extraction tool offloads HVEDR data. For heavy vehicles,the data port is commonly the“off-board diagnostic” (OBD) electrical connector as defined by SAE J1939-13, although others such as RP1226 or SAE J1962 may also be available. These contain pins for accessing data networks.
An electronic control unit (ECU) is an electronic subsystem that manages the functions of a vehicle system or components.ECUs are often called electronic control modules, or ECMs, or simply modules.
An event is a point in time, during the operation of a heavy vehicle, in which one or more threshold trigger criteria are met,causing the HVEDR to log data surrounding the event.
A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only.SAE J2728 pdf free download.