HP PCL/PJL reference - PCL 5 Comparison Guide

ENWW Printer-Specific Differences 2-81
A paper source is considered to be not specified when a Media
Source command has not been received or when the media source is
set to autoselect (value 7). The media type is considered to be not
specified when an Alphanumeric ID command for media type
(value 100) has not been received.
Selecting the default media type causes the printer to consider the
media type as not specified.
Selecting an undefined or unavailable ID causes the printer to
generate a manual feed request.
Media Type Paper Size Paper Source Size/Type Used
Not specified Not specified Not specified Default size
Default type
Not specified Not specified Specified
(not manual feed)
Default size
Type configured in specified tray
Not specified Not specified Specified
(manual feed)
Manual feed request
Default size
Not specified Specified Not specified Specified size
Default type
Not specified Specified Specified
(not manual feed)
Specified size
Type configured in specified tray
Not specified Specified Specified
(manual feed)
Manual feed request
Specified size
Specified Not specified Not specified Default size
Specified type
Specified Not specified Specified
(not manual feed)
Default size
Specified type
Specified Not specified Specified
(manual feed)
Manual feed request
Default size
Specified type
Specified Specified Not specified Specified size
Specified type
Specified Specified Specified
(not manual feed)
Specified size
Specified type
Specified Specified Specified
(manual feed)
Manual feed request
Specified size
Specified type