Asynchronous Serial Communications Programmer's Reference Manual (32022-90052)

Chapter 4 95
Using FDEVICECONTROL
Examples
One other notable feature of the example is the way errors are handled.
The example uses the fserrorcode parameter to provide information
to the user in the event of an error by writing the file system error
number to the standard output device.
Figure 4-1 FDEVICECONTROL to Enable Transparent Mode