## Physical Device Driver Reference

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### ASYNC_SETDCBINFO (53h) - Flags2

Flags2 Has the following bits:

Bit 0 Enable Automatic Transmit Control Flow (XON/XOFF). See Note 2.

Bit 1 Enable Automatic Receive Control Flow (XON/XOFF). See Note 2.

Bit 2 Enable error replacement character. See Note 5.

Bit 3 Enable null stripping. See Note 6.

Bit 4 Enable break replacement character. See Note 7.

Bit 5 Automatic Receive Flow Control:

0 = Normal
1 = Full Duplex.

Bits 6-7 RTS Control Mode. See Note 1.

Bit 7 Bit 6 Description
0 0 Disable
0 1 Enable
1 0 Input handshaking
1 1 Toggling on transmit