Understanding Control Code Definitions; I/O Buffer; Print Image Buffer; Special Notations - Intermec 6820 User Manual

Chapter 4 — Control Code Definitions

Understanding Control Code Definitions

I/O Buffer

Print Image Buffer

Special Notations

Special Notations
Notation Description
(0) Used in the ASCII column of any of the Format definitions, indicates that its value
can only be zero (and not the character "0"). For example: Select Top-Down Printing
ESC US (0).
(1) Used in the ASCII column of any of the Format definitions, indicates that its value
can only be one (and not the character "1"). For example: Select Bottom-Up Printing
ESC US (1).
* When a number (at the end of an escape sequence) is marked with an asterisk, then
either the value corresponding to that number or the value of the string character
can be used for that number. For example, if 1* is shown, then either the value (1), or
the value of the string character (decimal: 49, hex: 31) can be used.
T
NUL he NUL character is represented in the Dec column as 0, in the Hex column as 00,
and in the ASCII column as NUL.
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All characters and control codes received by the printer are stored in
this buffer. Characters and controls codes are read from this buffer
and acted upon to form the print buffer. Characters are removed from
the I/O buffer as they are processed.
All characters go through this buffer on their way to the printed page.
This buffer contains the graphic image of the dots to print, from
which characters are rendered. It is cleared when its contents are
printed.
The following information defines notations included in the format
definitions of the escape sequences, throughout this section.
6820 Series 80-Column Printer User Manual