TransAct Ithaca 280 Programmer's Manual page 245

Programming Codes
Function Define Single User-Defined Bit-Image
ASCII GS * x y d
Hexadecimal 1DH 2AH x y d
Decimal <29> <42> x y d
1  x  255
Range
1  y  48
0  d  255
Description The GS * x y d
using the number of dots specified by x and y in the RAM buffer area (volatile
memory). The number of dots in the horizontal direction is x x 8. The number of
dots in the vertical direction is y x 8. If (x x y x 8) exceeds the size of the buffer,
the image is truncated. d indicates bit-image data and specifies a bit printed to
one and not printed to zero. After a downloaded bit-image is defined, it may be
saved to the nonvolatile flash storage buffer using the ESC ‗ command where it
remains indefinitely. Otherwise, the image remains in the RAM buffer where it is
available until ESC @ or ESC & is executed; the power is turned off; or the
printer is reset. A representation of the format of a downloaded bit-image is
depicted below.
28-04430
... d(x x y x 8)
1
... d(x x y x 8)
1
... d(x x y x 8)
1
... d(x x y x 8) command defines a single downloaded bit-image
1
Column one
d1 dy ... ... ....
+1
d2 dy
+2
.... .... .... .... ....
dy
Rev K
®
iTherm 280 Programmer's Guide
MSB

d
n
....
LSB
 d(x  y  8)
Page 233