Casio IT-800 Series Software Manual page 108

Below is an example of data communication between the NFC module and smart card.
Figure 2-11
Note:
The NFC module consumes very little power while it is turned on. In addition, turning on the
module takes time so if you would like to start communicating with a smart card very quickly,
turn on the module at same time when activating the application. To start communication with a
smart card, start it by performing card polling. After the application is complete, be sure to close
the NFC module.
108