Your DSN-1000 Series SAN unit requires a female to male DB9 straight-through cable. Please see below for a diagram of the cable:
Your DSN-2000 or 3000 Series SAN unit requires a female to female DB9 straight-through cable.
Your DSN-5000 Series SAN unit requires a female DB9 to RS-232 stereo mini-jack cable. Please see below for a photograph of the cable.