Real Time Door Interlock System, Smart -I, DIS-E is a User Programmable real time Door Interlock System. This Real Time Door Interlock System is designed to suit modern door interlocking requirements DIS-E can also be interfaced with any access controller to log access events of any particular door. DIS-E has Master-Slave Configuration and can be configured to total 8 doors in one loop. Such 16 loops can be formed. It has the provision of emergency situation like fire, so as to release the door and also other provisions like "door Open too long" and "Door Force Open". Real Time Door Interlock System is flexible and can be configured onsite by the user for required door locking logic. If any of the slaves in the loop is not available the master will bypass the slave and functioning of the system will be smooth. The salient features of the Real Time Door Interlock System: