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Communication Timeout Error - IC-2820

If you are using the orange colored USB-RTS05 cable, this error may indicate that the radio's data port has been disabled. Plugging a cable into the radio's speaker jacks will disable the data port.
Dual Display

This is a single band/dual watch operation radio.  Dual watch operation allows you to monitor two frequencies simultaneously.   This radio accepts the information from the memory file
Software and Cables

The blue USB-29A cable plugs into the outside speaker jack on the back of this radio. Page 9 in the owners manual will refer to this as #10 external speaker jack. (Cable is used for programming only)
Cable Selection for Programming
On some Icom radios the USB-29A and the USB-RTS05 cables are offered for programming. This comparison will help you decide between the two cables. USB-29A