Star Micronics DOT MATRIX PRINTER SP2000 - Manual (Page 18)

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FUNCTION Selects uni-directional print mode
CODE <ESC> "U" "1" or <ESC> "U" <1>
(1B)H (55)H (31)H or (1B)H (55)H (01)H
OUTLINE Prints only when the print head moves from left to right.
FUNCTION Selects bi-directional print mode
CODE <ESC> "U" "0" or <ESC> "U" <0>
(1B)H (55)H (30)H or (1B)H (55)H (00)H
OUTLINE Returns to the standard bi-directional print mode. (This mode is
set automatically when the printer power is turned on.)