DCBINFO
Device control block information data structure.
Type
USHORT usWriteTimeout USHORT usReadTimeout BYTE fbCtlHndShake BYTE fbFlowReplace BYTE fbTimeout BYTE bErrorReplacementChar BYTE bBreakReplacementChar BYTE bXONChar BYTE bXOFFChar
C Declaration Method
typedef struct
Fields
- usWriteTimeout
- Time period used for Write Timeout processing. Specifies the time period used for Write Timeout processing. See Note 8 of ASYNC_SETDCBINFO. The value is in .01 second units based on zero (where 0 = .01 seconds).
- usReadTimeout
- Time period used for Read Timeout processing. Specifies the time period used for Read Timeout processing. See Note 9 of ASYNC_SETDCBINFO. The value is in .01 second units based on zero (where 0 =.01 seconds).
- fbCtlHndShake
- HandShake Control flag. Has the following bits:
- Bits 0-1 - DTR Control mode. Has the following:
- Bit 1 Bit 0 Description
- 0 0 Disable
- 0 1 Enable
- 1 0 Input handshaking
- 1 1 Invalid input. Results in a general failure error.
- Bit 2 - Reserved. Must be 0.
- Bit 3 - Enable output handshaking using CTS
- Bit 4 - Enable output handshaking using DSR
- Bit 5 - Enable output handshaking using DCD
- Bit 6 - Enable input sensitivity using DSR
- Bit 7 - Reserved. Must be 0.
- Bits 0-1 - DTR Control mode. Has the following:
- fbFlowReplace
- Flow Control flag. Has the following bits:
- Bit 0 Enable Automatic Transmit Flow Control (XON/XOFF)
- Bit 1 Enable Automatic Receive Flow Control (XON/XOFF)
- Bit 2 Enable error replacement character
- Bit 3 Enable null stripping (remove null bytes)
- Bit 4 Enable break replacement character
- Bit 5 Automatic Receive Flow Control:
- 0 = Normal
- 1 = Full-Duplex
- Bits 6-7 RTS Control mode. Has the following:
- Bit 7 Bit 6 Description
- 0 0 Disable
- 0 1 Enable
- 1 0 Input handshaking
- 1 1 Toggling on transmit
- fbTimeout
- Timeout flag. Has the following bits:
- Bit 0 Enable Write Infinite Timeout processing
- Bits 1-2 Read Timeout processing. Has the following:
- Bit 2 Bit 1 Description
- 0 1 Normal Read Timeout processing
- 1 0 Wait-For-Something, Read Timeout processing
- 1 1 No-Wait, Read Timeout processing
- Bits 3-4 Extended Hardware Buffering. Has the following:
- Bit 4 Bit 3 Description
- 0 0 Not supported
- 0 1 Extended Hardware Buffering Disabled
- 1 0 Extended Hardware Buffering Enabled
- 1 1 Automatic Protocol Override
- Bits 5-6 Receive Trigger Level. Has the following:
- Bit 6 Bit 5 Description
- 0 0 1 character
- 0 1 4 characters
- 1 0 8 characters
- 1 1 14 characters
- Bit 7 Transmit Buffer Load Count
- 0 = 1 character
- 1 = 16 characters
- See ASYNC_SETDCBINFO for field definitions.
- bErrorReplacementChar
- Error Replacement Character. Value in the range 00h-FFh. See note 5 of SYNC_SETDCBINFO
- bBreakReplacementChar
- Break Replacement Character. Value in the range 00h-FFh. See note 7 of ASYNC_SETDCBINFO
- bXONChar
- Character XON. Value in the range 00h-FFh. See note 2 of ASYNC_SETDCBINFO
- bXOFFChar
- Character XOFF. Value in the range 00h-FFh. See note 2 of ASYNC_SETDCBINFO