d. ESC 3 :Set line spacing
The following commands are effective only when in standard mode.
a. ESC W :Set print region in page mode
b. ESC T :Select character print direction in page mode
The following commands are ignored in standard mode.
a. GS $ :Specify absolute position for character vertical direction in page
mode.
b. GS \: :Specify relative position for character vertical direction in page
mode.
Standard mode is selected when the power is turned on, the printer is reset
or initialized (ESC @).