HP LaserJet 4100 HP PCL/PJL reference (PCL 5 Printer Language) - Technical Ref - Page 80
RO, Rotate Coordinate System, Angle of Rotation
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RO, Rotate Coordinate System This command rotates the printer's coordinate system relative to the default HP-GL/2 coordinate system, in the following increments of rotation: 90°, 180°, and 270°. Use RO to orient your drawing vertically or horizontally, or to reverse the orientation. RO angle[;] or RO [;] Parameter Format angle clamped integer Functional Range 0°, 90°, 180°, or 270° Default 0° Note The printer interprets the command parameters as follows: z No Parameter - Defaults the orientation of the coordinate system to 0°. Equivalent to (RO0). This is the same as PCL's current orientation. z Angle - Specifies the degree of rotation: 0 Sets the orientation to PCL's current orientation. 90 Rotates and shifts the coordinate system 90 degrees in a positive angle of rotation from PCL's current orientation. 180 Rotates and shifts the coordinate system 180 degrees in a positive angle of rotation from PCL's current orientation. 270 Rotates and shifts the coordinate system 270 degrees in a positive angle of rotation from PCL's current orientation. Angle of Rotation A positive angle of rotation is in the direction of the +X-axis to the +Y-axis as shown below. (A negative angle of rotation is not allowed in the RO command.) 19-34 The Configuration and Status Group EN