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User's Guide
D-22 Code Sets
Epson JX, Epson LQ-2550 and IBM XL24 Code Set
The second part of this appendix describes the Epson and IBM code set.
The printer responds to this code set when an Epson or IBM emulation
is active.
Character Codes
Most of the 256 8-bit codes that a computer can send to the printer are
assigned a printable character (see table D-4). When the printer receives
a character code, it prints the assigned character at the current print posi-
tion and moves the current print position one character space to the right.
Codes 0 to 32 and 128 to 159 decimal are assigned control functions that
override the printable characters. These codes are called control codes.
To print the characters assigned to control codes, it is necessary to use a
special code sequence that tells the printer to ignore control functions and
print the assigned characters.
One code that is assigned a control function is especially important to
the printer––code 27 decimal––which is the ASCII ESCape code. This
code tells the printer that an escape sequence is beginning. An escape
sequence is a series of codes that performs a specific printer function.
When a code is sent as part of an escape sequence, the assigned char-
acter does not print.
Printing Characters Assigned to Control Codes
There are several control codes and escape sequences in the code set
that enable the printing of characters assigned to control codes.
The ESC 6 and ESC 7 sequences enable and disable the characters
assigned control codes from 128 to 159. The ESC ^ sequence prints the
character assigned to any code––even one assigned to a control code.
The ESC I sequence in the Epson JX and LQ-2550 printer emulations
enables and disables some of the characters assigned control codes. The
ESC \ sequence in the IBM XL24 emulation prints a series of characters
while ignoring the control functions.
These sequences and others affecting character codes are described
later in this appendix.
User's Guide
D-22 Code Sets
Epson JX, Epson LQ-2550 and IBM XL24 Code Set
The second part of this appendix describes the Epson and IBM code set.
The printer responds to this code set when an Epson or IBM emulation
is active.
Character Codes
Most of the 256 8-bit codes that a computer can send to the printer are
assigned a printable character (see table D-4). When the printer receives
a character code, it prints the assigned character at the current print posi-
tion and moves the current print position one character space to the right.
Codes 0 to 32 and 128 to 159 decimal are assigned control functions that
override the printable characters. These codes are called control codes.
To print the characters assigned to control codes, it is necessary to use a
special code sequence that tells the printer to ignore control functions and
print the assigned characters.
One code that is assigned a control function is especially important to
the printer––code 27 decimal––which is the ASCII ESCape code. This
code tells the printer that an escape sequence is beginning. An escape
sequence is a series of codes that performs a specific printer function.
When a code is sent as part of an escape sequence, the assigned char-
acter does not print.
Printing Characters Assigned to Control Codes
There are several control codes and escape sequences in the code set
that enable the printing of characters assigned to control codes.
The ESC 6 and ESC 7 sequences enable and disable the characters
assigned control codes from 128 to 159. The ESC ^ sequence prints the
character assigned to any code––even one assigned to a control code.
The ESC I sequence in the Epson JX and LQ-2550 printer emulations
enables and disables some of the characters assigned control codes. The
ESC \ sequence in the IBM XL24 emulation prints a series of characters
while ignoring the control functions.
These sequences and others affecting character codes are described
later in this appendix.