I have read the manual and all of the threads that seem to be related to connecting to a PC through the serial cable but I still cant get it to connect. I am a spoiled Mac user so I am not adept at dealing with the bowels of the Windows systems so maybe I need a really dumbed down explanation of what i am doing wrong. I am using Parallels with Windows XP installed. I have downloaded Aquarium Controller and installed it. I purchased a Sabrent USB to serial converter. On-line manual said no driver need to be installed for XP. Wrong...device not recognized when plugged in. Downloaded driver from Sabrent website and successfully installed, device now recognized. Connected the cable to the Profilux RS232 cable. Went to windows device manager found device connected to COM4. Opened Aquarium controller in connections under interface changed to COM4. Wont connect. Tried changing to COM5 on device and Aquarium control still no luck. Any advice?