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For example, to set TXRDY two-wire auto control mode, use the
following code:

ULONG TranceiverMode = 131;

ULONG dummy;

DeviceIoControl(hDevice,

IOCTL_SERIAL_SET_TRANSCEIVER_MODE,(PVOID)

&TransceiverMode,sizeof(ULONG),NULL,0,&dummy,NULL);

ULONG TranceiverMode = 131;

DeviceIoControl(hDevice,

IOCTL_SERIAL_SET_TRANSCEIVER_MODE,(PVOID)

&TransceiverMode,sizeof(ULONG),lpOutBuffer,

nOutBufferSize,lpBytesReturned,lpOverlapped);

Table 6-3. DeviceIoControl Function Input Values

Four-wire mode

128

Two-wire mode: DTR with echo

129

Two-wire mode: DTR controlled

130

Two-wire mode: TXRDY auto control

131