National Instruments PCI-8430 - Page 117

Connection SERIAL_CONNECTION_INVALID
SERIAL_CONNECTION_VALID
3. ToretrievethecurrentRS-232transceiverstate,use
NISERIAL_GET_RS232_STATEandDeviceIoControlwiththe
followingcode:
SERIAL_RS232_STATEl_SerialRs232State;
DWORDl_ByteCount;
DeviceIoControl(
PortHandle,
NISERIAL_GET_RS232_STATE,
(LPVOID)NULL,
0,
(LPVOID)&l_SerialRs232State,
sizeof(l_SerialRs232State),
(LPDWORD)&l_ByteCount,
NULL
);