## Physical Device Driver Reference

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### ASYNC_GETDCBINFO (73h) - Flags1

Flags1 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 (returned as 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 (returned as 0)