ASYNC_SETDCBINFO (53h) - Flags3

Flags3

Has the following bits:

Bit 0

Enable Write Infinite Timeout processing. See Note 8.
Bits 1-2
Enable Read Timeout processing. See Note 9.

Bit 2

Bit 1 Description
0
0 Invalid input. Results in a general failure error.
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. See Note 10.

Bit 4

Bit 3 Description
0
0 Not supported; ignored. No change to FIFO state.
0
1 Disabled
1
0 Enabled
1
1 Automatic Protocol Override.
Bits 5-6
Received trigger level. See Note 11.

Bit 6

Bit 5 Description
0
0 1 character
0
1 4 characters
1
0 8 characters
1
1 14 characters
Note: The trigger level must be set to 1 character when Enhanced mode is on.
Bit 7
Transmit Buffer Load Count. See Note 12.
• character 1 =
  16 characters.
  Note: When Extended Hardware Buffering is disabled, this bit is set by the device driver.

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