Mitsubishi QD51 Programming Manual page 286

Logic controller

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Table of Contents

11 INSTRUCTIONS AND FUNCTIONS

• See Sections 7.2.1 and 7.3.3.

• Since there are a large number of Kanji characters, all the characters cannot be

assigned a character number in the 256 different character codes of one byte (8

bits). Therefore, for Kanji, 2 bytes (16 bits) of code is used for each character. This

allows 65536 types of codes ranging from 0000h through FFFFh. However, if 1-

byte and 2-byte codes are simply used, it cannot be determined when 2 bytes of

code are used to express a Kanji character. To remedy this, two types of Kanji

codes have been developed.

• JIS Kanji Code

A Kanji shift-in (KI) code is always placed in front of a code that expresses Kanji

character and a Kanji shift-out (KO) code is always placed in back of a code that

expresses a Kanji character. Since Kanji shift-in and shift-out codes are

predetermined, data can be identified whether or not it expresses Kanji characters

It's Kanji because it uses

KI and KO codes.

• Shift JIS Kanji Code

In Shift JIS Kanji code, there is a rule that states that one byte of character code

from 80h through 9Fh or E0h through FFh express the first byte of a Kanji code.

When this method is used, special codes (Kanji shift-in/shift-out) are not necessary

to express Kanji characters, but character codes 80h through 9Fh and E0h

through FFh cannot be used.

It's Kanji because it

• The Shift JIS Kanji code (Kanji code used by the communication module) and JIS

code correspond as follows.

mm indicates the upper

bytes of the Shift JIS code.

nn indicates the lower

bytes of the Shift JIS code.

are unused areas.

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