Printer setting in Solaris

I have Solaris-10 server and want to change default printer setting to Simplex (Instead of duplex, which is set currently). I am not able to see anything in conf file related to this setting.
Please help

set the default print settings on the physical printer to be simplex? We do that here.

Or:

The Solaris Print Manager is meant for setting up options. You have to be root.

Most places: simplex and duplex are job-specific options, usually, and you employ the lp command to send those options:

lp -o simplex -d printername filename

As per the doc, to set duplex setting -

lpadmin -p print-queue -o Duplex=None

Can we set simplex setting default as permanent on printer ? That way it will print all jobs on non-duplex setting.