If the Till setting is set to "ON" then you will be required to have a cash draw for that till and open close the till at the beginning and end of your shift. If set to "OFF" then you will not be able to open the till and transactions processed using this till will not go to a cash draw.
You can still use personal banks with till set to off
Tills can be enabled or disabled in the Terminal Settings.
Terminal settings can be accessed using the "Terminal Settings" button on the login screen.