In Heuston: Gate with green arrow illuminated:-
- Display says 'Please wait' - ticket cannot be inserted into the ticket slot.
- Display says 'Ready' - the ticket passes throught and the gate opens.
I think a more positive signal is required if the machine is not accepting magnetic stripe tickets than the display saying 'Please wait'. Perhaps if a yellow light was displayed to indicate smartcard only or, if the machine is faulty, a red light.