Expanded Functions; Power Control - Casio DT-X200 Series Software Manual

2.11.3 Expanded functions

Radio wave auto stop timing notification
After successfully activating an IC card using the card polling function, the radio wave
transmission will stop automatically if a certain time elapses without any data communication
between the NFC module and the IC card. When this happens, it is possible to send a notification
to the user application of the time the radio wave transmission stopped, using either a window
message or an event.
This notification function can be enabled or disabled, and is disabled under the default setting.

2.11.4 Power control

Device power-off during non-use
In order to save power, power supply supply to a NFC device isn't performed in the state which
doesn't open a NFC device.The device is turned on upon executing the open function, and turned
off upon executing the close function.
Control when the terminal is off
The NFC control software switches the device off when the handheld terminal is turned off.
Furthermore, when the terminal power is switched on again, the NFC control software executes
the process corresponding to the mode that the device was in when the terminal was turned off.
The respective operations which occur when the terminal power is turned on or off are shown in
the table below.
Status
Card polling active
Data communication
active
Open mode
Closed mode
*1 When card polling resumes after the power is turned back on, the timeout picks up from where it
ended in the card polling prior to turning the power off.
In addition, the elapsed card polling time is suspended while the terminal power is off.
*2 When the device power is turned off during data communication and operation is suspended, the
power supply to the IC card is interrupted so the card mode is reset.
Please resume card polling to restart communication in this mode.
Terminal power off
Card polling suspended
Device power off
Data communication
suspended
Device power off
Device power off
No process
75
Terminal power on
Device power on
Card polling resumes
*2
Device power on
Device power on
No process
*1