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CONFIDENTIAL
RP-U420 Definitions
Ver. 1.0
p. 14
(11) Horizontal/vertical direction
Horizontal direction is the direction which is perpendicular to the paper feed direction. Vertical direction is the
paper feed direction.
(12) Baseline
The baseline for character sets that are 9 dots high (for example, 7 × 9 and 9 × 9) is the invisible line marking the
bottom of the character matrix (the bottom of the lowest dot possible), but for other character sets, the baseline is
the bottom of all characters, except that descenders, such as the bottom parts of “g” and “y,” are below the
baseline.
(13) Setting commands
The commands that change printer status by processing a command and affect printer operation and print results
thereafter. The commands that can specify enhanced characters, set paper feed amount, and select a character are
setting commands and some of the normal commands are setting commands.
(14) Executing commands
The commands that affect printer operation and change the printer status temporarily but do not affect the
following printer operation. Functions of printing, paper cutting, and status transmission are executing commands
and the real-time commands and some of the normal commands are executing commands.
(15) MSB
Most Significant Bit
(16) LSB
Least Significant Bit
(18) “Reserved“ bit
“Reserved” bits are as follows:
• Bit which will be used for an extended function in the future.
• Bit which has a function in the ESC/POS specification; however, the printer does not support the function.
Use a bit with a value indicated in a table.
(19) “Fixed” bit
Use a bit only with a value indicated in a table.