CITIZEN CT-S300 - Manual (Page 74)

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GS h n
[Function] Specifying the height of the bar code
[Code] <1D>H<68>H<n>
[Range] 1 n 255
[Outline] Selecting bar code height.
“n” denotes the number of dots in the vertical direction.
[Default] n = 162
[See Also] GS k, GS w
[Sample Program] Refer to Sample Program and Print Results for GS w.