## Physical Device Driver Reference

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### ASYNC_SETDCBINFO (53h) - Flags1

Flags1 Has the following bits:

Bits 0-1 DTR Control Mode. See Note 1.

Bit 1 Bit 0 Description
0 0 Disable
0 1 Enable
1 0 Input handshaking
1 1 Invalid input, resulting in a general failure error.

Bit 2 Reserved. Set to 0.

Bit 3 Enable output handshaking using CTS. See Note 3.

Bit 4 Enable output handshaking using DSR. See Note 3.

Bit 5 Enable output handshaking using DCD. See Note 3.

Bit 6 Enable input sensitivity using DSR. See Note 4.

Bit 7 Reserved. Set to 0.