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User's Guide
D-46 Code Sets
Table D-6. Epson and IBM Escape Sequences––continued
Function ASCII Hexadecimal Decimal Description
Graphic Functions––continued
Print Epson LQ-2550 ............... ESC * m 1B 2A m 27 42 m The list in the sequence is a series of codes that define the
graphics (continued) n1 n2 list n1 n2 list n1 n2 list columns to print. Modes with 72 dots per vertical inch print
8-dot-high columns. For these modes, the first code defines the
first column, the second code defines the second col-umn, and so
on. Each bit in a code controls a specific dot in the column. The
most significant bit controls the top dot, the next bit control the
second dot, and so on. If the bit is "1", the dot prints; if the bit is
"0", the dot does not print. For example, FF hex prints all eight
dots in the column, 00 hex prints no dots, 0F hex prints the lower
four dots, and F0 hex prints the upper four dots.
Modes with 180 dots per vertical inch print 24-dot-high-columns.
For these modes, the first three codes define the first column, the
second three codes define the second col-umn, and so on. Each
bit in a code controls a specific dot in the column. The most
significant bit of the first code con-trols the top dot, the next bit
controls the second dot, and so on. The most significant bit of the
second code controls the ninth dot from the top, the next bit
controls the tenth dot, and so on. And finally, the most significant
bit of the third code controls the 17th dot from the top, the next bit
con-trols the 18th dot, and so on. If the bit is "1", the dot prints;
if the bit is "0", the dot does not print. For example, FF FF
FF hex prints all 24 dots in the column, 00 00 00 hex prints no
dots, 00 FF 00 hex prints the middle eight dots, and 80 00 01 hex
prints the top and bottom dots.
Print IBM XL24 ....................... ESC [ g n1 n2 1B 5B 67 n1 n2 27 91 103 n1 n2 This sequence starts any one of eight different graphics
graphics m list m list m list modes, wherein character codes no longer print characters, but
instead print 8-dot-high or 24-dot-high columns of dots on the
current print line. Depending on the mode, the columns are
spaced from 1/60 to 1/360 inch apart and dots within each
column are spaced either 1/72 inch apart or 1/180 inch apart.
This sequences does not change line spacing.
Variables n1 and n2 define the number of bytes in the list. For
modes with 72 dots per vertical inch, this number equals the
number of columns being defined plus one. For modes with 180
dots per vertical inch, this number equals three times the number
of columns being defined plus one. The printer interprets n1 and
n2 as follows:
Number of bytes = (256 x n2) + n1
For example, to print 300 columns in a graphics mode with 72
dots per vertical inch, n2 would be 1 and n1 would be 45 (300 =
((256 x 1) + 45) - 1).
User's Guide
D-46 Code Sets
Table D-6. Epson and IBM Escape Sequences––continued
Function ASCII Hexadecimal Decimal Description
Graphic Functions––continued
Print Epson LQ-2550 ............... ESC * m 1B 2A m 27 42 m The list in the sequence is a series of codes that define the
graphics (continued) n1 n2 list n1 n2 list n1 n2 list columns to print. Modes with 72 dots per vertical inch print
8-dot-high columns. For these modes, the first code defines the
first column, the second code defines the second col-umn, and so
on. Each bit in a code controls a specific dot in the column. The
most significant bit controls the top dot, the next bit control the
second dot, and so on. If the bit is "1", the dot prints; if the bit is
"0", the dot does not print. For example, FF hex prints all eight
dots in the column, 00 hex prints no dots, 0F hex prints the lower
four dots, and F0 hex prints the upper four dots.
Modes with 180 dots per vertical inch print 24-dot-high-columns.
For these modes, the first three codes define the first column, the
second three codes define the second col-umn, and so on. Each
bit in a code controls a specific dot in the column. The most
significant bit of the first code con-trols the top dot, the next bit
controls the second dot, and so on. The most significant bit of the
second code controls the ninth dot from the top, the next bit
controls the tenth dot, and so on. And finally, the most significant
bit of the third code controls the 17th dot from the top, the next bit
con-trols the 18th dot, and so on. If the bit is "1", the dot prints;
if the bit is "0", the dot does not print. For example, FF FF
FF hex prints all 24 dots in the column, 00 00 00 hex prints no
dots, 00 FF 00 hex prints the middle eight dots, and 80 00 01 hex
prints the top and bottom dots.
Print IBM XL24 ....................... ESC [ g n1 n2 1B 5B 67 n1 n2 27 91 103 n1 n2 This sequence starts any one of eight different graphics
graphics m list m list m list modes, wherein character codes no longer print characters, but
instead print 8-dot-high or 24-dot-high columns of dots on the
current print line. Depending on the mode, the columns are
spaced from 1/60 to 1/360 inch apart and dots within each
column are spaced either 1/72 inch apart or 1/180 inch apart.
This sequences does not change line spacing.
Variables n1 and n2 define the number of bytes in the list. For
modes with 72 dots per vertical inch, this number equals the
number of columns being defined plus one. For modes with 180
dots per vertical inch, this number equals three times the number
of columns being defined plus one. The printer interprets n1 and
n2 as follows:
Number of bytes = (256 x n2) + n1
For example, to print 300 columns in a graphics mode with 72
dots per vertical inch, n2 would be 1 and n1 would be 45 (300 =
((256 x 1) + 45) - 1).