CITIZEN CT-S300 - Manual (Page 121)

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GS (N pL pH fn m
[Function] Designating font attribute
[Outline] Executes processing of font attribute by the specified fn value.
fn = 48: Function 48
GS (N pL pH fn m fn = 48
[Code] <1d>H<28>H<4E>pL pH fn m
[Range] (pL + pH × 256) = 2 : (pL = 2, pH = 0)
fn = 48
m = 49 (At single color paper setting)
m = 49, 50 (At 2-color paper setting)
[Default] m = 49
[Outline] Prints the succeeding characters with the energy set in m.
fn Function
48 Selects character color.
m Function
49 High energy
50 Low energy