Citizen iDP-3550 User Manual page 81

ESC "N" n
[Function] Setting the lower margin
[Code] <1B>H <4E>H n
[Range] 0 n 255
[Outline] This command sets the n-line lower margin.
[Default] n = 0
ESC "O"
[Function] Canceling the lower margin
[Code] <1B>H <4F>H
[Outline] This command deselects the set lower margin.
ESC "l" n
[Function] Setting the left margin
[Code] <1B>H <6C>H n
[Range] 0 n (Right margin - 2)
[Outline] This command sets the left margin and printing starts from the column next to the set margin.