User`s guide

defaulttrayswitch
Syntax: defaulttrayswitch integer
Function Returns whether the printer is to switch to the other
paper tray on paper out. This variable accepts a legal
boolean value, true or false. When defaulttrayswitch is
set to true, all subsequent paperout errors are
suppressed and paper is fed into the printer from the
optional tray as long as the optional tray contains the
correct paper type. A paper error occurs when the
optional tray contains a paper size different than the
current paper size. When trayswitch is set to false and
a paper out occurs, the feed tray is not switched, even
if the remaining tray contains the correct paper. If
trayswitch changes in value during a job, the new value
effects all future paper out conditions for the duration
of the job. When changed outside the server loop, it
persists over all jobs until subsequently changed.
Errors stackoverflow
setdefaulttrayswitch†
Syntax: boolean setdefaulttrayswitch
Function Establishes the default tray switch (chaining). At
power-up this value determines if the optional paper
tray can be used as a backup when the standard tray is
out.
Errors invalidaccess rangecheck, stackunderflow, typecheck
Chapter 10
PostScript: Operator Dictionary 10-27