Duplex Printing with SAP script

Hi Experts,

We have a requirement to do duplex printing using SAP script. I have set duplex mode (D) in SAP script print attributes ( For first page I have set as 'D' and for next page i have left blank ), but the output is not printing on both sides.Printer is capable of duplex printing, Please help me with a solution.

Regards,

Kiran.