Casio IT-2000W Technical Reference Manual page 127

Note:
The application must enable the event using the SetCommEventMask function before the
GetCommEventMask function records the occurrence of an event. If the communication device
event shows a line status error, the application should call the GetCommError function after calling
the GetCommEventMask function.
Note on IrDA:
Some of the events are not supported at present. Some of the supported functions will operate only if
9-Wire connection is established or if both 9-Wire and 3-Wire connections are established.
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