Страница 1 мировой engineering стандарты общая спецификация

8.11.5.2 DefinePIDbyAddress Example with 3-Byte memoryAddress.
In this example (Table 130):
PID $CCFF is dynamically definable,
The ECU uses 3 byte addressing and the tester requests memory data in address $011102,
The value of the MemorySize parameter is $02,
The tester responds with a positive response with PID $CCFF,
The node has a physical request CANId of $241,
The node has a physical USDT response CANId of $641.
Table 130: DefinePIDbyAddress with 3-Byte memoryAddress
T = Frame Sent By Tester, N = Frame Sent By Node; shaded region indicates PCI
Frame Type CAN Id
#1
#2
#3
#4
#5
#6
#7
#8
T(USDT-SF)
$241
$07
$2D
$CC
$FF
$01
$11
$02
$02
N(USDT-SF)
$641
$03
$6D
$CC
$FF
---
---
---
---
8.11.6 Node Interface Function.
8.11.6.1 Node Interface Data Dictionary (Table 131).
Table 131: Node Interface Data Dictionary of ReadMemoryByAddress Service Pseudo Code
Variable/Meaning
Values
message_data_length
Security_Access_Unlocked
Reference Common/Global
Pseudo
Code
Data
Dictionary For Definition Of
These Flags/Variables
Bad_Address
Status flag that indicates whether any of the range of addresses in the request is
not valid.
TRUE/FALSE
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
Page 153
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
Variable/Meaning
Values
memoryAddress
This is the starting address in ECU memory from the request message.
Varies based on ECU
numAddressBytes
This is a local variable used to identify the number of bytes in the tester request
message for the memoryAddress parameter.
2 to 4, depending on ECU
Addressing scheme
memorySize
This is the number or consecutive memory addresses that the tester has
requested (parameter of request message).
$01 to $07
Memory_Address
Varies based on ECU

---

25.06.2020
WORLDWIDE ENGINEERING STANDARDS General Motors Local Area Network Enhanced Diagnostic Test Mode Specification
https://translate.googleusercontent.com/translate_f
136/298
© Copyright 2010 General Motors All Rights Reserved
February 2010
Page 153 of 336
This is a local variable used to point to ECU memory when indexing through the
requested addresses to determine if any portion of the requested memory is
invalid, protected, or requires security access. The pseudo code uses
Memory_Address.data to reflect the contents of a given memory address.