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SAE J2735-Draft-Rev18 [issued: 06-26-07]
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130 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
defined in the standard which could be transmitted in the WSM encoding format of encoded bytes. The
definition of these elements (semantic meaning and transmitted byte length) is expected to be exchanged by
the using parties by means outside the scope of this standard. The value range where the most significant
byte is set to zero is reserved for use in mapping to existing single byte tags into this range (where the
lower byte shall follow in the setting and meaning provided by the StdTagList element). The value range
where the most significant byte is set to 255 shall be reserved for future use. In keeping with the general
practices for ITS for expansion ranges, local values should begin to assign with an upper value of 127. So
in practice the first assigned element would be 0x80, 0x01 and so on. The sub-range with an upper byte
of 0x32 to 0x64 is further defined to be data of variable length where the byte following the two
byte tag is the byte count of the data to follow.
ASN.1 Representation:
TwoByteTagList ::= INTEGER (0..65535)
-- Values with the upper byte = 0 TO 127, or = 255
-- are reserved for use by the DSRC std
-- Local use should set the upper byte to 127 and above
XML Representation:
<xs:simpleType name="TwoByteTagList" >
<xs:annotation>
<xs:documentation>
Values with the upper byte = 0 TO 127, or = 255
are reserved for use by the DSRC std
Local use should set the upper byte to 127 and above
</xs:documentation>
</xs:annotation>
<xs:restriction base="xs:unsignedShort"/>
</xs:simpleType>
Used by: This entry is directly used by the following 3 other data structures in this standard (record type,
descriptive name, ASN.1, and XML name (if present) of each):
MSG
<XML>, and
MSG
<XML>, and
MSG
In addition, this item may be used by data structures in other ITS standards.
Remarks: Note that when the first byte of a tag is zero that the lower bytes may simply be parsed as if it is
a StdTagList element and the definition used for the bytes which follow it. In cases where the data content
which follows this tag may be of indeterminate length (such as a string) a termination character must be
agreed upon by all users of the message to enable the correct parsing of the element.
7.91 Data Element: DE_VehicleHeight
Use: The height of the vehicle, measured from the ground to the highest surface, excluding any antenna(s),
and expressed in units of 5 cm. In cases of vehicles with adjustable ride heights, camper shells, and other
devices which may cause the overall height to vary, the largest possible height will be used.
ASN.1 Representation:
VehicleHeight ::= INTEGER (0..255)
-- the height of the vehicle
-- LSB units of 5 cm, range to 12.75 meters
XML Representation:
<xs:simpleType name="VehicleHeight" >
<xs:annotation>
<xs:documentation>
the height of the vehicle
LSB units of 5 cm, range to 12.75 meters
</xs:documentation>
</xs:annotation>