Citizen Systems PPU-231II - Manual (Page 69)

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• When mapping non-character data (Bit image, downloaded
bit image, or bar code), if the print area specified is narrower
than 9-bits, only the line for that data is handled as follows:
(1) The print area is extended toward the left (So, the left
margin is decreased) until it is 9-dot wide, but not wider
than the printable area.
[Default] nL = 0, nH = 0
[See Also] GS P, GS W