Common question we get asked a lot is:
How does the Point of Sale plugin link with the cash drawer?
Our answer is in short, it does not link.
The cash drawer is actually connected to the printer. When a printer is printing, it sends voltage to the cash drawer which triggers it to open. So, in short, when you print, the drawer opens. Receipts tend to print when there is a sale being made.
What about if I want to open the cash drawer?
We have not found a way to directly interface from a web browser to a cash drawer, but we are happy to develop it once we know about it.