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Chapter 6
Data Format Restrictions
3D Mode Commands
40
This section describes the restrictions that are associated with the X, Y,
Z, Pitch, Yaw, and Roll values in Table 6-2.
•
X, Y, and Z fields correspond to signed numbers with absolute
maximum values of -1048576 and +1048575 (or 221). Each bit in the
X, Y, and Z fields represent a dot with a resolution of 1/1000 inch.
Therefore, the maximum spatial range is approximately ±1048
inches or ±87 feet from the origin of each axis.
•
Pitch, Yaw, and Roll fields correspond to unsigned binary numbers
with absolute maximum values of 16383. Each bit in these fields
represent one part, with a resolution of 40 parts per degree. The
maximum rotational range is 360 degrees, and the maximum
number of parts required to cover the entire rotational range is
14400 (0-14399).
The 3D Mouse rotation is measured in 10 parts per degree.
Therefore, the lower two bits of the Pitch, Yaw, and Roll fields are
always 0.
•
In 3D mode, mouse data reports are 16 bytes in length, with 10 bits
transmitted per byte (1 start bit, 8 data bits, and 1 stop bit). The
software generates reports at a maximum rate of 50 reports per
second.
This section describes the standard 3D Mode command set. The
standard 3D mode command sent to the 3D Mouse control unit from the
host computer consists of two or more characters with the first always
being an asterisk "*" (2A hex). You must issue all 3D mode commands
except the Software Reset (*R) command and the Demand Reporting
(*D) command) while the system is in the Demand reporting mode. You
can issue the exceptions in any 3D reporting mode.
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