Epson 4500 - Manual (Page 262)

Commands Arranged by Topic
MSB Control
MSB means the Most Significant Bit. MSB control (ESC =,
ESC > , and ESC #) does not work for graphics or user-defined
characters.
ESC =
Format:
ASCII code:
Decimal:
Hexadecimal:
Comments:
ESC =
27 61
1B 3D
Set MSB to 0
Sets the MSB of all incoming data to 0. Some computers always send
data with the MSB set to 1, which means that italics or character
graphics are always printed. ESC = can overcome this problem.
ESC >
Format:
ASCII code: ESC >
Decimal : 27 62
Hexadecimal: 1B 3E
Comments:
Sets the MSB bit of all incoming data as 1.
Set MSB to 1
ESC # Cancel MSB Control
Format:
ASCII code: ESC #
Decimal: 27 35
Hexadecimal: 1B 23
Comments:
Cancels the MSB control set by ESC = or ESC > .
Command Summary 9-11