Epson SQ-2550 User Manual page 271

ESC SI
Format:
ASCII code: ESC SI
Decimal:
Hexadecimal: 1B OF
Comments:
Duplicates the SI command and the function of SelecType
and control panel settings.
DC2
Format:
ASCII code: DC2
Decimal:
Hexadecimal: 12
Comments:
Cancels condensed printing set by SI, ESC SI or the SelecType
and control panel settings.
so
Format:
ASCII code: SO
Decimal:
Hexadecimal: 0E
Comments:
Double-width mode doubles the width of all characters. This
mode is cancelled by a carriage return or DC4. ESC SO
duplicates this command.
27 15
18
Select Double-width Mode (one line)
14
Select Condensed Mode
Cancel Condensed Mode
Command Summary 9-27