We suggest a BAFO model BF810 adapter cable. Also needed is a DB-9 male to female adapter or cable so that the DB-9 on the BF810 can plug onto the DAD. The standoffs on the stock part will not allow it to be inserted into the DAD860 DB-9 unless the adapter is used with it. Install the included driver to the PC before connecting the cable to the PC. We have had good results with this cable. If it doesn’t recognize the com port, try plugging into a different USB port.