Casio IT-2000W - Manual (Page 125)

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SetCommBreak
int SetCommBreak(idComDev)
int idComDev; /* Device to interrupt communication */
The SetCommBreak function is used to interrupt character transmission and set the communication
device to the break state.
< Parameter >
idComDev: Specifies the communication device to be interrupted. The OpenComm function returns
this value.
< Return value >
Returns zero if the function is terminated normally. Otherwise a value less than zero will be
returned.
Note:
The communication device continues to be interrupted until the application calls the
ClearCommBreak function.
Note on IrDA:
The SetCommBreak function will operate only if 9-Wire or 3-Wire connection is established. It will
not function if 3-Wire RAW connection is established. If this is the case, the SetCommBreak
function will be terminated normally.