Страница 1 мировой engineering стандарты общая спецификация

Page 150
GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
© Copyright 2010 General Motors All Rights Reserved
February 2010
Page 150 of 336
8.11.2 Request Message Definition (Table 124).
Table 124: DefinePIDbyAddress Request Message
Data Byte
Parameter Name
Cvt
Hex Value Mnemonic
#1 
Note 1
DefinePIDbyAddress Request Service Id
M
2D
SIDRQ
#2
#3
parameterIdentifier = [
PIDHighByte_1
PIDLowByte_1]
M
M
xx
PID_
B1
B2
#4
#5
#6
#7
memoryAddress = [
memoryAddress (Byte1 - MSB),
memoryAddress (Byte2),
memoryAddress (Byte3),
memoryAddress (Byte4) ]
M
M
C1 
Note 2
C2 
Note 3
xx
MA_
B1
B2
B3
B4
#6/7/8 
Note 4
memorySize = [
memorySize]
M
xx
MS_
Note 1: 
Byte1 in the memoryAddress parameter is always the most significant byte of the address and the last byte of the memoryAddress
parameter (Byte2 for 2 byte addressing, Byte3 for 3-byte addressing, or Byte4 for 4-byte addressing) is always the least significant byte of
the memoryAddress parameter.
Note 2: 
C1: Byte 6 is present when the memoryAddress parameter contains three or four bytes.
Note 3: 
C2: Byte 7 is present when the memoryAddress parameter contains four bytes.
Note 4: 
MemorySize byte is actual number of data bytes returned by the memory address specified. This value is limited to seven bytes
maximum, so the memorySize is only a single byte value (hex) which should never exceed a value of $07.
8.11.2.1 Request Message Sub-Function $Level Parameter Definition. 
Because this service is defined as a
single operation, there are no sub-function levels required or valid for the request message.