Citizen Systems iDP-3550 - Manual (Page 92)

ESC "U" n
[Function] Selecting the Unidirectional/Bidirectional print mode
[Code] <1B>H <55>H n
[Range] 0
≤
n
≤
255
[Outline] This command selects or deselects unidirectional print.
n0 = 0 Bidirectional print
n0 = 1 Unidirectional print
ESC "@"
[Function] Initializing the printer
[Code] <1B>H <40>H
[Outline] This command cancels various conditions set after power-on to initializes the printer to the
conditions having existed at power-on. However, the input buffer is not initialized.