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Interface RS232C
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Hardware Properties
Interfacing devicesBit Rates DTE/DCE Speeds Flow control The UART Types of UARTs Null modems Loop Back Plug Registers |
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DCB sructure detects the management settings for the serial port of the connection device. DCB structure contains the following members: DWORD DCBlength - sizeof(DCB) DWORD BaudRate - baud rate. There is a standard set of : all the rate constants look like CBR_ E.g. CBR_9600, CBR_115200. Flags DWORD fBinary - Eof character check mode � Windows doesn't support this mode (at least now). Mask $01 DWORD fParity - Parity control Mask $02 � enabling Parity control DWORD fOutxCtsFlow - Mask $04 � enabling CTS signal control at bytes output. DWORD fOutxDsrFlow - Mask $08 � enabling DSR signal control at bytes output. DWORD fDtrControl - Mask $30 � DTR signal control type: values
DWORD fDsrSensitivity - Mask $40 - enabling DSR signal control. DWORD fTXContinueOnXoff - XOFF continues Tx DWORD fOutX - Mask $100. Enabling XON XOFF out flow control DWORD fInX - Mask $200 -//- when receiving DWORD fErrorChar - Mask $400. Allowing to replace the received byte with a ErrorChar structure member if the reception was erratic (parity mismatch occurred). DWORD fNull - Mask $800 enable null stripping � skip NULL characters when receiving DWORD fRtsControl - Mask $3000. Control type:
DWORD fAbortOnError - Mask $4000. Abortion of read/write operations if errors occur DWORD fDummy2 - Not used Other structure data WORD wReserved - Not used WORD XonLim - min number of bytes in the receiving buffer before the XON character is sent WORD XoffLim - min number of bytes in the receiving buffer before the XOFFcharacter is sent BYTE ByteSize - number of bits in a byte is from 4 to 8 BYTE Parity - 0-4=no,odd,even,mark,space parity bit, BYTE StopBits - 0,1,2 = 1, 1.5, 2 � stop bits, 1,5 used only when 5 bits are sent to 8250 chip.
char XonChar - Tx and Rx XON symbol char XoffChar - Tx and Rx XOFF symbol char ErrorChar - Symbol replacing the byte received by mistake char EofChar - end of input character char EvtChar - received event character WORD wReserved1 - Not used | |||||||||
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