Citizen Systems PPU-231II - Manual (Page 73)

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[Function] Detecting a black mark
[Code] <1D>H<53>H
[Outline] • This command is valid only when a black mark is set in the
paper selection with DIP switch.
• Entering this command allows detection of a black mark.
• When a black mark is detected, the print paper is cut and
ejected.
• Also at the time of printer power on, a black mark is detected
and the print paper is cut and ejected. (Settable with DIP switch)
• If the 18-in. black mark cannot be detected, a mark detection
error occurs, causing BUSY and FAULT to be generated while
cutting and ejecting the print paper.
[Caution] This command is ignored when normal thermal paper is set in
the paper selection with DIP switch.