Printer settings in mfg/pro

Dear Friends,
How we do printer settings in mfg/pro? which is the parameter responsible for selecting the TRAY in the printer.
for eg: I have a printer contains 3 TRAYS for letterhead, A4, A6 . I want to do setting to select 3rd TRAY to print data on A6 paper.
 
PCL Printer Command language you can create sespearte ones in printer type maint else just edit the esc sequences in printer maintenance.
 
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