Toshiba B-EP Series Interface Specification page 554

8.10.15 PRINTER SELECT/DESELECT COMMAND
Function Selects or deselects the printer.
While the printer is deselected, received data is discarded until it is selected by this
command again.
Format [ESC] =n
Term ASCII: ESC =
Hex: 1Bh 3Dh
[Parameter]
n: Selecting / deselecting printer
Default value n: 1
Explanation (1) n is valid only in the least significant bit.
(2) While being deselected, the printer is waiting only for this command. So please
note that if the same code arrangement as [ESC] =1 (1Bh, 3Dh, 01h) is contained in
the data such as writable characters or images transmitted while the printer is being
deselected, the printer will be returned to the "selected" state.
b7
-- -- -- --
CHAPTER 8 ESC/POS MODE (INTERFACE COMMANDS)
[ESC] =
0 ≤ n ≤ 255 (00h ≤ n ≤ FFh)
-- -- --
8-27
B-EP Series
b0
0: Deselecting printer
1: Selecting printer