Customizing The Variable Polygon Delay - Scanlab RTC 5 PC Interface Board Installation And Operation Manual

Customizing the Variable Polygon Delay

The command load_varpolydelay (page 346)
a table for the scaling function scale() from an ASCII
text file. The text file can contain one or more tables.
Each table can contain up to 50 data points
(  scale()) for various angles . The RTC
mines the scaling function scale() from this data by
linear interpolation.
Figure 36 shows a sample table and the corre-
sponding scaling function.
The following rules apply for these tables:
• Each table must start with the instruction
(Caption)
[VarPolyTable<No>]
where <No> must be replaced by a nonnegative
integer which denotes the table number.
• If the table contains multiple
[VarPolyTable<No>] entries with the same
<No>, then only the instructions after the first
entry will be used; instructions that follow further
entries will be ignored. Only instructions up to the
next '[' character (that is not preceded by a
semicolon) are used.
• Each data point (  scale()) is described by two
instructions:
Angle<n> = <Value>
Scale<n> = <Value>
where <n> must be replaced by an integer
(1  <n>  50) which denotes the number of the
data point. The values <Value> for the angle  (in
; sample
[VarPolyTable1]
Angle1 = 20
Scale1 = 0.1
Angle2 = 40
Scale2 = 0.7
Angle3 = 60
Scale3 = 1.0
Angle4 = 90
Scale4 = 1.2
Sample table and resulting scaling function scale(). The sample table contains four data points.
®
RTC 5 PC Interface Board
Rev. 1.9 e
7 Basic Functions for Scan Head and Laser Control
degrees) and for the scaling factor can be speci-
fied as (unsigned) floating point numbers. Use
loads
the period (.) as the decimal separator.
• If the table contains multiple data points with the
same Index <n>, then the most recently read one
will be used and the previous ones ignored.
®
5 deter-
• If the table contains multiple data points with the
same angle , then the data point with the largest
Index <n> will be used and the others ignored.
Equality is checked to within ±0.01°.
• For <Value>, the following ranges apply:
0.0°    180.0° and 0.0  scale()  2.0.
• Each instruction must be in a separate line.
• Spaces and tabs in a line (e.g. between '=' and
<Value>) are ignored.
• Empty lines are ignored.
• Data points with invalid values are ignored.
• The data point of a particular index <n> is ignored
if the corresponding Angle<n> and/or Scale<n>
definition is missing.
• The semicolon ';' can be used for comments. All
characters in a line following a semicolon are
ignored.
• The instructions for data points in the table can
be ordered as desired.
• Indices for data point pairs in the table can be
selected as desired within the range [1...50] (the
table will then be automatically sorted by
ascending angles).
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