Samsung SRP-350 Operator's Manual page 25

When the LSB of n is 0, smoothing mode is turned off.
When the LSB of n is 1, smoothing mode is turned on.
GS f n
[Name] Select font for Human Readable Interpretation(HRI) characters.
[Format] ASCII
Hex
Decimal
[Range] n = 0, 1, 48, 49
[Description] Selects a font for the HRI characters used when printing
a bar code. n selects a font from the following table:
n Font
0, 48 Font A (12 × 24)
1, 49 Font B (9 × 17)
GS f n
1D 66 n
29 102 n