To set up your printer to automatically open the cash drawer, please follow these steps:
Plug the RJ12 connector from your cash drawer to the printer
Travel to the URL: http://localhost:631/printers/, and there will be a page that names CUPS appears
Click on the Receipt_Printer hyperlink belonging to the Star TSP100 cutter to open the Receipt_Printer page
CUPS.org
Receipt_Page
From the Administration dropdown, select “Set Default Options” to open the Set Printer Options page
Select the Cash Drawer Control button, then from the Cash Drawer dropdown, select the Open Drawer 1 and 2 option. After that, you only need to click on the Set Default Options button to complete the setup
Show when setting printer options successfully