fsMask (USHORT)

State mask.

The system state altered by this call. If bits 0 and 1 are off, the echo state of the system is not altered. If bits 2 and 3 are off, the binary and ASCII state of the system is not altered. If bits 0 and 1 are on, or if bits 2 and 3 are on, the function returns an error. If binary mode is set, echo is ignored.

Bits 15-9

Reserved.
Bit 8
Shift return is on.
Bit 7
Length of the turn-around character (meaningful only if bit 6 is on).
Bit 6
Turn-around character is modified.
Bit 5
Interim character flags are modified.
Bit 4
Shift state is modified.
Bit 3
ASCII mode is on.
Bit 2
Binary mode is on.
Bit 1
Echo off.
Bit 0
Echo on.

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