GTCO 2500 Series - Users Guide 3/3 User Manual
Page 21
2500 Series 21
Resolution
When the transducer is placed on the active area of the tablet, the tablet calculates its X
and Y position relative to the origin. Those calculations are not in inches, millimeters or
any other standard units. Those numbers represent counts, arbitrary units of
measurement calculated by the digitizer. If the cursor is moved to the right until the X
value output increases by one, the cursor has been moved over by one count. The digitizer
keeps track of how many counts lie between the tablet origin and the cursor position. It
outputs the number of counts as the coordinate pair. The digitizer always outputs counts,
although they may be sized to represent millimeters or inches. The number of counts per
inch or millimeter may be varied by this command.
Any number of lines (counts) per inch or millimeter may be selected, up to the maximum
resolution. The counts will be sized accordingly. A round number does not need to be
selected.
Host = ESC % J R n1 n2 CR (lines per inch)
Host = ESC % J M n1 n2 CR (lines per millimeter)
Menu = [SYSTEM FUNC 1] [R] [n1] [,] [n2] [CR] (lines per inch)
Menu = [SYSTEM FUNC 1] [M] [n1] [,] [n2] [CR] (lines per millimeter)
Where:
n1 is the desired resolution in lines per inch, 1 to 2540 or lines per millimeter, 1 to 100.
n2 may range from 0 to 6. n2 determines the offset for the decimal point in the output
field. If a zero is input for this number, the decimal point will be located to the right of the
right-most digit and the output will be expressed in whole counts.
Half Resolution Compared to True Resolution
The maximum specified resolution of the tablet is 50 lines per millimeter or 1280 lines per
inch.
If the resolution is 1000 lines or counts per inch, each count is 1/1000
th
of an inch long. A
transducer placed 13 inches to the right and 7 inches above the origin will produce an
output of X13000, Y7000. Inches are easy to read at this resolution because the first two
digits show the number of full inches and the last three digits display the fractional
thousandths of an inch.