Hitachi HT-4139-28 Developer's Manual page 49

A p p e n d i x
A-4 Notes on the Barcode
The bar code recognition does not always work perfectly.
You cannot acquire the barcode information if a part of the barcode is not search or if the total
recognition characters exceed 255 bytes.
The following table shows the correspondence between the barcode type on the Scanning Image
Settings Dialog and the type reported by TWEI_BARCODETYPE in
DG_IMAGE/DAT_EXTIMAGEINFO/MSG_GET.
Barcode Type Correspondence Table
Barcode type in the Reading Image Settings
EAN13
EAN8
Codabar
Code39
Industrial 2 of 5
Code128
EAN128
DG_IMAGE/DAT_EXTIMAGEINFO/MSG_GET returns the same value even if you issue it many
times when the same sheet is being scanned.
A-4
Type of TWEI_BARCODETYPE
TWBT_EAN13
TWBT_EAN8
TWBT_CODABAR
TWBT_3OF9
TWBT_2OF5INTERLEAVED
TWBT_CODE128
TWBT_UCC128