HP 220240 - Manual (Page 29)

— The Online and Ready indicators remain on and the display reads
00 READY DEC.
NOTE:
The display reads 00 READY DEC only if you are using
Digital’s ANSI-Compliant Printing Protocol, which is the factory
default setting. If you are using an optional protocol such as
PostScript or CaPSL, the display shows the protocol being used.
For instance, if you are using PostScript protocol, the display reads
PS READY/IDLE. Since several protocols can be used with the
DEClaser 2200 plus printer, the remainder of this manual shows
the message as 00 READY.
If the printer does not power on correctly, refer to Chapter 6 for
troubleshooting information.
2–2 Operator’s Guide