Toshiba B-EP Series Interface Specification page 589

8.10.43 REVERSE CHARACTER SET COMMAND
Function Sets or cancels reverse characters (white text on black)
Format [FS] Bn
Term ASCII: GS B
Hex: 1Dh 42h
[Parameter]
n: Setting reverse characters
Default value n: 0
Explanation (1) n is valid only in the least significant bit.
(2) Reversed printing applies to the internal and downloaded characters.
(3) Reversed printing also applies to spacing on the right of a character defined by the
Spacing Set Command ([ESC] [SP]).
(4) There is no impact upon bit images, downloaded bit images, barcodes, or HRI
characters, or a portion skipped by the Horizontal Tab Command ([HT]) or Relative
Position Set Command ([ESC] \).
(5) There is no impact upon spacing between lines.
(6) A higher priority is given to reversed printing than underlining. Therefore, even if
underlining is specified, reverse characters will not be underlined. However, the
underlining settings will remain unchanged.
b7
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CHAPTER 8 ESC/POS MODE (INTERFACE COMMANDS)
[GS] B
0 ≤ n ≤ 255 (00h ≤ n ≤ FFh)
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8-62
B-EP Series
b0
0: Canceling reverse character
1: Setting reverse character