Fabio, thank you for your answer.
But this PDL Reference Guide is for DC 240. The date of document is September3, 2002.
Where can I find PDL Reference Guide for DC 242 printer ?
I tried to set "/Mediaposition" 5 for print from Tray5, but it was unsuccessfully.
The DC 242 used Tray2 instead Tray5.
The Printertrays program searches fo bin codes, but this codes relate to windows driver, not to postscript tray id.
For example, printer HP 4250 has postscript tray id 3 for Tray 1.
Printertrays program display tray id "259" for Tray 1.