The figure 7.8 shows the flow diagram of the process of interfacing the sensor to the UISI. Initially the front end of the UISI is in sleep mode until any sensor is connected to it. The UISI has current sensor incorporated in it, so if any sensor is connected to it then it will detect easily by observing the change in current due to the sensor. When UISI is turned ON, a procedure for sensor ID assignment and TEDS transmission required for plug and play connectivity is activated. The UISI switch from sleep mode to active mode if any sensor is detected else it will again go back to sleep mode. After the sensor is connected sensor’s ID is acquired and stored in the volatile memory. This ID with be compared with the ID sent by the NCAP for extracting TEDS…show more content… If the TEDS information is not available then the remote device will send the query signal demanding the custom TEDS for the connected sensor to NCAP wirelessly using 2.4GHz link. If TEDS information is received from NCAP the device will proceed further else it will again send the query signal. On receiving the TEDS information the device will configure its front end according to the received information. Once initial configuration is done then the sensor are given supply. After the supply if there is any fault then device will actuate a alarm signal which will be transmitted to the NCAP wirelessly. On receiving this information the power to the socket will be switched off. If there is no problem when power is switched ON then the particular operating mode is configured. Once the configuration is completed the data acquisition from the sensor will be started and the sensed data is sent to NCAP
