Epson GT-6500 EN - Manual (Page 74)

Resolution, zoom, and maximum scannable area
The ID information provides you the following values.
R
MAX
(in dpi) : The maximum scannable area available
X
MAX
(in dots) : The maximum main scan value (at the maximum
resolution, 100% zoom)
Y
MAX
(in dots) : The maximum sub scan value (at the maximum
resolution, 100% zoom)
Based on these values, you can calculate the maximum scannable area
for various resolution and zoom settings according to the following
formulas.
Main scan (in dots)
nx
=
INT



X
MAX
R
MAX
×
R
X
×
H
X
100



Sub scan
ny
=
INT



Y
MAX
R
MAX
×
R
Y
×
H
Y
100



Based on these values, the limits of the parameters for the
ESC A command are as follows:
n
1
(
main scan skip length
)
: 0
≤
n
1
≤
nx
−
8
n
2
(
sub scan skip length
)
: 0
≤
n
2
≤
ny
−
1
n
3
(
main scan reading length
)
: 8
≤
n
3
≤
8
×
INT



nx
−
n
1
8



n
4
(
sub scan reading length
)
: 1
≤
n
4
≤
ny
−
n
2
n
1
+
n
3
≤
nx
n
2
+
n
4
≤
ny
Note:
The limits of the n
3
parameter depend on your scanner model. See
your scanner’s manual for details.
2-36 Command Usage