TaoTronics TT-BS009 - Manual (Page 93)

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Scan the Position of G4（2 Digits；00~99； 00*）
FN1 substitution string setting
The FN1 character (0x1D) in an UCC/EAN128 barcode, or a Code 128
barcode, or a GS1 DataBar barcode can be substituted with a defined string.
Enable FN1 Substitution
Disable FN1 Substitution *
Scan FN1 substitution string setting（0~4 Chars，2 Digits /Char；00~FF； 00*）
Truncate leading G5 String setting
By setting G5, a defined leading character or string can be truncated. G5 can
also be set to be repeated.
Scan G5 String（0~16 Chars，2 Digits /Char；00~FF； 00*）