MSG Message Text
To provide a free-form format that allows the transmission of text information
Free-form Message Text
Free-form message text
Printer Carriage Control Code
Code identifying the control of the line feed of the receiving printer
MSG02 is not related to the specific characteristics of a printer, but identifies top of page, advance a line, etc.
A generic number
C0302: If MSG-03 is present, then MSG-02 is required
MSG03 is the number of lines to advance before printing.
If MSG02 is "AA - Advance the specified number of lines before print" then MSG03 is required.