Citizen Systems iDP-3550 - Manual (Page 58)

DC3
(CBM1 Mode)
[Function] Specifying the red print
[Code] <13>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.
DC3
(CBM2 Mode)
[Function] Deselecting the printer
[Code] <13>H
[Outline] This command sets the printer in the deselecting status in which the printer cannot receive
data. To set the printer in the selecting status, use DC1.
CAN
[Function] Canceling the print data
[Code] <18>H
[Outline] This command clears the print data in the lines entered prior to this command.