Esc I B Specify Baud Rate; Z Zero Raster Graphics; Ff Print Command; Control-Z Print Command With Feeding - Brother RJ-4030 Software Manual

ESC i B Specify baud rate
ASCII: ESC
Hexadecimal: 1B
Parameters
Setting=n1+n2*256
Setting: 96=9600 bps, 576=57600 bps, 1152=115200 bps
Description
 Changes the communications baud rate for the printer. The manufacturer's default setting is 9600 bps.
Z Zero raster graphics
ASCII: Z
Hexadecimal: 5A
Description
 Fills raster line with 0 data.
FF Print command
ASCII: FF
Hexadecimal: 0C
Description
 Used as a print command at the end of pages other than the last page when multiple pages are printed.
Control-Z Print command with feeding
ASCII: Control-Z
Hexadecimal: 1A
Description
 Used as a print command at the end of the last page.
i B {n1} {n2}
69 42 {n1} {n2}
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Raster Command Reference
4. Printing Command Details