1. User Manual for Microprocessor based Talk Back System Doc Ref No CS MTBS 7919 V1 0 Block Diagram cree Reception Control Panel Description The Microprocessor based Talk Back system is used for attending visitors without a receptionist in an office The block diagram shown above is a typical 4 1 talk back system This system can be used as a standalone system or can be combined with CCTV Operation The above block diagram shows the typical wiring and logical connection between the modules The operation of the system is as follows 1 At normal condition all the mics and speakers will be in off mode while the control panel monitors the entire system 2 When a person is detected near the entrance by CCTV popped up in the computer screen not included in this project one of the four persons sitting in room to 4 shall attempt to talk to the person 3 When the RED push to ON switch button is pressed the control panel connects the mic amp speaker to the room from which the switch was pressed to the reception C Systems 18 14 Ramakrishna Nagar Extn Alwarthirunagar Chennai 600 087 Telefax 9 1 44 43552009 Email sales csystemsindia com www csystemsindia com User Manual for Microprocessor based Talk Back System Doc Ref No CS MTBS 7919 V1 0 mic amp speaker so that both the persons can communicate The person should hold the push button as long as he communicates with the person outside the door 4 When mo 2. re than one person tries to press the button the control will select the room based on the first priority and the other calls are dropped 5 When the information is exchanged the person in the room can release the switch amp go back to work NOTE when one person is communication with the person outside the door no other person cantry to talk Specification Main Console Input Voltage 230V AC 1 phase 50 Hz Analog Output 5 x 2 terminals for 5 speakers amp 5 x 2 terminals for 5 mics Digital Output 5 x 2 terminals for soft push button Casing ABS plastic casing with terminals for connection Indication Green LED for Power Red LED for latching circuit C Systems 18 14 Ramakrishna Nagar Extn Alwarthirunagar Chennai 600 087 Telefax 91 44 43552009 Email sales csystemsindia com www csystemsindia com