Toshiba B-EP Series Interface Specification page 587

8.10.41 CHINESE CHARACTER MAGNIFICATION SET COMMAND [FS] W
Sets or cancels the quadrupling of Chinese character (double height × double width).
Function
Format [FS] Wn
Term ASCII: FS W
Hex: 1Ch 57h
[Parameter]
n: Setting quadrupling of Chinese character (double height × double width)
Default value n: 0
Explanation (1) n is valid only in the least significant bit.
(2) If the quadrupling of a Chinese character (double height × double width) is canceled
by this command, the subsequent Chinese character is printed in standard size (x
1).
(3) A Chinese character size can also be specified by the Character Size Set
Command ([GS] !) or Chinese Character Print Mode All Set Command ([FS] !), but
the most recently processed command is applied.
Reference Chinese Character Print Mode All Set Command ([FS] !)
Character Size Set Command ([GS] !)
b7
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CHAPTER 8 ESC/POS MODE (INTERFACE COMMANDS)
0 ≤ n ≤ 255 (00h ≤ n ≤ FFh)
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8-60
B-EP Series
b0
0: Canceling quadrupling
1: Setting quadrupling