POS Cash drawers are often referred to as "Terminal & Printer Driven Cash Drawers".
These drawers connect to the back on your receipt printer via an RJ11 connection. The connection looks like land-line phone connector. They can also be used manually with a key, not connected to anything.
POSHelp Tip: POS till drawers come either 24volt or 12volt. Printers need the 24Volt and pos terminals normally need 12 volt. Feel free to call for advice.