Epson 4500 - Manual (Page 291)

Commands Arranged
by Topic
ESC ? Reassign Graphics Mode
Format:
ASCII code: ESC ? s m
Decimal : 27 63 s m
Hexadecimal: 1B 3F s m
Comments:
Changes from one graphics mode to another. The variable s is a
character (K, L, Y or Z), representing the commands ESC K, ESC L,
ESC Y, and ESC Z.
The variable m has a range of 0 through 6 and corresponds to the
mode m in the ESC * command.
9-40 Command Summary