Brother RJ-4040 - Manual (Page 42)

ESC/P Command Reference
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5. Control Command Details
ESC SP Specify character spacing
ASCII: ESC SP n
Decimal: 27 32 n
Hexadecimal: 1B 20 n
Parameters
0≤n≤127
Description
 Specifies the character spacing.
 n indicates the number of dots.
 The default setting is 0 dot.
 With double-width characters, the character spacing is doubled; with half-width characters, it is halved.