SII DPU-S245, Technical Reference

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1-1
CHAPTER 1
TERMS USED IN THIS MANUAL
This chapter describes the terms used in this manual.

INPUT BUFFER AND LINE BUFFER
When the DPU-S245 (hereinafter it is referred to as “printer”) receives data (character codes and
commands) from the host devices, it stores the data in the printer input buffer. The input buffer has
a capacity of 4K bytes (4096 bytes). Then, the printer retrieves data from the input buffer. If data is
character code, data is stored into the line buffer. If data is command, data is executed as
command immediately.
The printer inputs character codes to the line buffer until the amount of character codes reaches
the amount to be printed on one line, then prints the characters. The printer repeats this operation
to print all the character data.
The relationship between the input buffer and line buffer is illustrated in Figure 1-1.
Figure 1-1 Relationship between Input Buffer and Line Buffer

1-byte characters and 2-byte characters
The printer can print two-size characters; 1-byte size characters and 2-byte size characters.
Table 1-1 lists the character types which can be printed by 1-byte size and 2-byte size characters.
Table 1-1 Character Types and Relationship between 1-byte and 2-byte Characters
Character Types
1-byte characters
Katakana character (ANK)
Extended graphics character (IBM Compatible)
Codepage 1252
2-byte characters Kanji, User-defined characters
* The size of a character to be printed differs depending on the font specified. (See 2.1 Printer Specifications.)
One Line of Characters
is Printed.
Line Buffer Print Operation
Input Buffer
Host Device