CITIZEN CT-S300 - Manual (Page 85)

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2.2.13 Black Mark Control Commands
GS FF (Valid Only at B.M Paper Selection)
[Function] Printing and ejecting Black mark paper
[Code] <1DH><0C>H
[Outline] This command prints the data in the printer buffer and ejects Black mark paper.
[Caution] Valid only if Black mark paper is selected.
[See Also] FF, GS <
GS < (Valid Only at B.M Paper Selection)
[Function] Initializing the printer mechanism
[Code] <1D>H<3C>H
[Outline] Performs initializing operation at Black mark similar to the initialization at power on.
[Caution] • This command is valid only when B.M paper is chosen.
• Parameters configured by commands are not reset.