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User's Guide
Code Sets D-45
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 Variable m
graphics (continued) n1 n2 list n1 n2 list n1 n2 list Mode Resolution ASCII Hex Dec
Single 72V x 60H dpi NUL 00 0
Double 72V x 120H dpi SOH 01 1
HS double 72V x 120H dpi STX 02 2
Quadruple 72V x 240H dpi ETX 03 3
CRT I 72V x 80H dpi EOT 04 4
CRT II 72V x 90H dpi ACK 06 6
Single 180V x 60H dpi SP 20 32
Double 180V x 120H dpi ! 21 33
CRT III 180V x 90H dpi & 26 38
Triple 180V x 180H dpi ' 27 39
Hex 180V x 360H dpi ( 28 40
In the HS double, quadruple and hex modes, consecutive
horizontal dots are not permitted. If the sequence
specifies consecutive horizontal dots, the printer does not
print the second dot.
Variables n1 and n2 define the number of columns to
print. For modes with 72 dots per vertical inch, this
number equals the number of bytes in the list. For
modes with 180 dots per vertical inch, this number equals
one-third the number of bytes in the list. The printer
interprets n1 and n2 as follows:
Number of columns = (256 x n2) + n1
For example, to print 300 columns, n2 would be 1 and n1
would be 44 (300 = (256 x 1) + 44).
The list in the sequence is a series of codes that define the
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; e.g., 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, 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,
etc. 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. Finally, the most significant bit of the third
code controls the 17th dot from the top, the next bit
controls the 18th dot, etc. If the bit is "1", the dot prints;
User's Guide
Code Sets D-45
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 Variable m
graphics (continued) n1 n2 list n1 n2 list n1 n2 list Mode Resolution ASCII Hex Dec
Single 72V x 60H dpi NUL 00 0
Double 72V x 120H dpi SOH 01 1
HS double 72V x 120H dpi STX 02 2
Quadruple 72V x 240H dpi ETX 03 3
CRT I 72V x 80H dpi EOT 04 4
CRT II 72V x 90H dpi ACK 06 6
Single 180V x 60H dpi SP 20 32
Double 180V x 120H dpi ! 21 33
CRT III 180V x 90H dpi & 26 38
Triple 180V x 180H dpi ' 27 39
Hex 180V x 360H dpi ( 28 40
In the HS double, quadruple and hex modes, consecutive
horizontal dots are not permitted. If the sequence
specifies consecutive horizontal dots, the printer does not
print the second dot.
Variables n1 and n2 define the number of columns to
print. For modes with 72 dots per vertical inch, this
number equals the number of bytes in the list. For
modes with 180 dots per vertical inch, this number equals
one-third the number of bytes in the list. The printer
interprets n1 and n2 as follows:
Number of columns = (256 x n2) + n1
For example, to print 300 columns, n2 would be 1 and n1
would be 44 (300 = (256 x 1) + 44).
The list in the sequence is a series of codes that define the
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; e.g., 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, 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,
etc. 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. Finally, the most significant bit of the third
code controls the 17th dot from the top, the next bit
controls the 18th dot, etc. If the bit is "1", the dot prints;