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Handling special characters
If the BHT reads any barcode consisting of special characters only (such as FNC, CODEA, CODEB,
CODEC and SHIFT characters), it will not transfer the data to the barcode buffer. The beeper sounds
only if it is enabled.
Details about FNC characters
(1) FNC1
The BHT will not transfer an FNC1 character placed at the first or second character position
immediately following the start character, to the barcode buffer. FNC1 characters in any other positions
will be converted to GS characters (1Dh) and then transferred to the barcode buffer like normal data.
If an FNC1 immediately follows the start character, the barcode will be recognized as EAN-128 and
marked with W instead of K.
(2) FNC2
If the BHT reads a barcode containing an FNC2 character(s), it will not buffer such data but transfer it
excluding the FNC2 character(s).
(3) FNC3
If the BHT reads a barcode containing an FNC3 character(s), it will regard the data as invalid and
transfer no data to the barcode buffer, while it may drive the indicator LED and beeper (vibrator) if
activated this BHT_EnableBar function.
(4) FNC4
An FNC4 converts data encoded by the code set A or B into a set of extended ASCII-encoded data
(128 added to each official ASCII code value).
1 A single FN4 character converts only the subsequent data character into the extended ASCII-
encoded data.
A pair of FNC4 characters placed in successive positions converts all of the subsequent data
characters preceding the next pair of FNC4 characters or the stop character, into the extended ASCII-
encoded data. If a single FNC4 character is inserted in those data characters, however, it does not
convert the subsequent data character only.
An FNC4 character does not convert any of GS characters converted by an FNC1 character, into the
extended ASCII-encoded data.
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