Denso HC36 II TU-K Operation Manual page 27

C/D transmission for EAN-8
≪Enable≫
Transmission of country code for UPC-A/EAN-13
If you disable the transmission of country code, the number
system character in a UPC-A code and the upper two digits of
the prefix character in an EAN-13 will be omitted when those
codes are transmitted. In such transmission, no pad characters
"0" will be transmitted, independent of the setting.
≪Enable≫
Conversion to the ISBN/ISSN format for EAN-13
If the conversion is enabled, EAN-13 codes will be converted
to the ISBN or ISSN format when the prefix character is 978 or
977, respectively.
Enable
C/D transmission for Standard 2 of 5
This setting will take effect when "Reading Standard 2 of 5 with
C/D" is specified (see page 30).
≪Enable≫
≪Disable≫
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Disable
Disable
Disable
C/D= Check Digit