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Function RTModemStatus

Function RTModemStatus queries the Modem Status Register of a port:

BYTE RTModemStatus(int Port);

Parameters

Port

Must have value RT_COM1 .. RT_COM4.

return value

The modem status. See the status mask constants in Rttcom.h for all possible return values. Several bits may be set simultaneously.

Serial Port I/O

Function RTLineStatus

Function RTModemControl