Ricoh M281 Series Service Manual page 812

Printing Features
PCL5 triggers
PS triggers
PDF triggers
* "userdict" is excluded by configuring Printer Bit Switch 5-3=1.

Up to 2KB from the start of the job can be searched for triggers.

"%%" can be added to the PS triggers by configuring Printer Bit Switch 5-3=1

If a job is identified as PDF, it will be sent to the PS interpreter to be processed as a
regular PS job.
PS interpreter
PCL5 trigger

Up to 256 bytes from the start of each page can be searched for triggers.
D255/D256/M281/M282
[ESC]E
[FF]
%!PS-Adobe-3.1
"%!"
"dict begin"
"bind def"
"findfont"
"showpage"
"/statusdict"
"0 startjob"
[EOT]
"}" + space character + "def"
"userdict" (*)
%PDF-
%!PS-Adobe-M.nPDF- (*M, n=numeric)
[ESC]E and 2 or more continuous PCL
commands
4-4 SM Appendix