The DMX Director presents itself as a standard com port to your PC. It requires the FTDI VCP driver. Typically you want to communicate with the DMX Director at 3Mbps. This allows for the lowest latency transfer of data to the DMX director.
The DMX Director expects DMX data to be supplied in a specific format. It is not ENTTEC compatible.
If you wish to communicate with the DMX Director, the most up to date Griswold Protocol can be found here as a Google Doc.