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The PID query and response occurs on the vehicle's CAN bus. Standard OBD requests and responses use functional addresses. The diagnostic reader initiates a query using CAN ID 7DFh, which acts as a broadcast address, and accepts responses from any ID in the range 7E8h to 7EFh.
Property identification (PID) Property account number; Tax account number; Sidwell number; The term or terms used in any particular jurisdiction are as determined by the authority assigning the numbers. The terms lot and parcel are often used interchangeably, but they have different meanings. [1]
On some systems, like MPE/iX, the lowest available PID is used, sometimes in an effort to minimize the number of process information kernel pages in memory. The current process ID is provided by a getpid() system call, [8] or as a variable $$ in shell. The process ID of a parent process is obtainable by a getppid() system call. [9]
Each of the programs listed in PAT has an associated value of PID for its PMT. The value 0x0000 for program_number is reserved to specify the PID where to look for network information table. If such a program is not present in PAT the default PID value (0x0010) shall be used for NIT. TS packets containing PAT information always have PID 0x0000.
Memory address length (in bytes), Sub-Function Byte: defineByMemoryAddress; Combinations of the two above methods through multiple requests. 0x2E 0x6E Write Data By Identifier With the same Data Identifier (DID), values can also be changed. In addition to the identifier, the new value is sent along. 0x3D 0x7D Write Memory By Address
PID controller (proportional-integral-derivative controller), a control concept used in automation; Piping and instrumentation diagram (P&ID), a diagram in the process industry which shows the piping of the process flow etc. Principal ideal domain, an algebraic structure; Process identifier, a number used by many operating systems to identify a ...
Originally, Controller Area Network (CAN) was not mentioned in J1939, which covered cars and tractor-trailer rigs, and with some dual and triple use 8-bit addresses assigned by the SAE J1939 board. CAN was not originally free, but its instruction set did fit in the custom instruction format of J1939.
Instead, the system simply redefines the "parent PID" field in the child process's data to be the process that is the "ancestor" of every other process in the system, whose PID generally has the value of 1 (one), and whose name is traditionally "init" (except in the Linux kernel 3.4 and above [more info below]).