GTCO 2500 Series - Users Guide 3/3 - Manual (Page 22)

2500 Series 22
The resolution of 50 lines per millimeter is the maximum specified metric resolution for the
9100 Digitizer. The coordinate pair is not easy to read at this resolution. The output mist
be divided by 5 or multiplied by 2 to show the counts as whole and fractional millimeters.
The half-resolution mode can convert the 50 counts per millimeter into 100 counts per
millimeter before outputting the coordinate pair. The true resolution is still 50 lines per
millimeter, but the output is easier to read. At this resolution, the first three digits of the
output numbers represent whole millimeters and the last two represent the fractional
hundredths of a millimeter.
If you enter a resolution above the maximum true resolution of 50 lpmm, the tablet
automatically changes to half-resolution mode. The effective resolution will be half of the
value entered. In this mode, it is necessary to move the stylus or cursor a distance of two
counts to produce a change of one count in the output. The output will increase or
decrease by twos. No odd numbers will be output in half-resolution mode. At a resolution
setting of 70 lines per millimeter, the true resolution is 35 lines per millimeter, counting by
twos to show 70 counts in each millimeter.
The inches resolution also has half-resolution mode. At a setting above 1280 lines per inch,
the digitizer begins counting by twos and effective resolution drops to half of the setting.
At a 2000 lines per inch setting, the effective resolution is 1000 lines per inch. The
maximum setting is 2540 lines per inch, an effective resolution of 1270 lines per inch. This
is the same resolving power as the half-resolution 100 lines per millimeter setting.
EXAMPLES:
You want the output in printer’s points (1/6 inch) and tenths of points for a page layout
program. A resolution of 60 LPI and an offset of 1 will give that measurement. The
command would be:
Host = ESC % J R 60 1 CR
Menu = [SYSTEM FUNC 1] [R] [,] [1] [CR]
You are digitizing an old map with a scale of 1:24,000 and would like the output to be in
distance. A resolution of 2400 LPI would make ten distance units on the map equal one
line on the tablet. This is half-resolution mode, so the output distances would be in even
units only. The offset could be 0 and the output multiplied by 10; 1 and the output
multiplied by 100; or the power of ten you want.
Host = ESC % J R 2400 0 C R