Страница 1 мировой engineering стандарты общая спецификация

Table 220 and Table 221 
for the detailed definition of the
HFI.
M
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WORLDWIDE ENGINEERING STANDARDS General Motors Local Area Network Enhanced Diagnostic Test Mode Specification
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February 2010
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GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
© Copyright 2010 General Motors All Rights Reserved
February 2010
Page 263 of 336
Offset
Number
of Bytes
Name
Description
Cvt
$05
4 to 16
SWMI
This is a variable-length field that contains the 
SWMI 
(refer to
DID $C1 thru $CA definitions in Appendix C) data reported
via the $1A service. The Header Format Identifier field
contains length information for this field of the header.
M
End of
SWMI
+ 1
2 to 3
DLS
This is a variable length field that contains the modules
D
esign 
L
evel 
S
uffix (
DLS
) or Alpha Code (ASCII)
M
End of
previous
field
+ 1
2
DCID_
This optional field is present if the H_N
Size 
bit of the HFI is 1,
and the DCID bit in the HFI field is also a 1. This field is two
bytes in length and contains a Data Compatibility identifier
value. For an operational software module header this value
is compared against a constant in the bootloader to ensure
that the software being downloaded is compatible with the
boot software in the ECU. For a calibration file header this
value is compare by the programming executive against a
corresponding value in the operational software header to
ensure that there is no mismatch between the calibration file
and the operational software.
U
End of
previous
field
+ 1
1 to 2
NOAR
This optional field is present if the