Citizen Systems iDP-3550 - Manual (Page 57)

DC1
(CBM2 Mode)
[Function] Selecting the printer
[Code] <11>H
[Outline] This command sets the printer in the selecting status.
DC2
(CBM1 Mode)
[Function] Specifying/Canceling the inverted character
[Code] <12>H
[Outline] This command selects/deselects the inverted characters. Enter this command at the
beginning of one line. Otherwise, it is overridden. Erect and inverted characters cannot be
mixed in one line.
DC2
(CBM2 Mode)
[Function] Specifying the red print
[Code] <12>H
[Outline] This command specifies red-color characters. All the characters in one line are printed in red
by prefixing the print data with this command and sending it to the printer. When you want
to use red characters, use this command for each line.