I dropped by Beijing West today. The instructions are in a cartoon video in the top part of the machine. This is not for foreigners with a passports. it is for those who bought discounted tickets online such as students or military.
I have photos but I seem unable to post them now. Not all icons above the response box are loading. terrible internet here at the Hilton (and they asked me to pay 90RMB per day for internet!). Will try to post them tomorrow.