Hi
You do not need any serial cable, the control is done over IP, Just setup the antenna switch to use FT-2000/5000... etc protocol.
Under Radio-RRC settings, set enable and the IP address of the radio-RRC. And click the Automatic control button on the mainpage That's all you need to do.
The Serial-cable is only needed if you do NOT have a Remoterig system and want to have automatic antenna switching.
73 de mike