[Kenwood] TS-2000 and MCP Software problem

[NZ8J]

    I loaded the free MCP software from Kenwood and have the computer
connected to the radio, but cannot seem to establish communications with the
radio.  I have successfully used the same computer and cable to run a Ten
Tec Jupiter, so I know the basic setup works. I have checked the ports and
speed. Is there something that must be set in the radio menu to make it
work, I can't see anything obvious..
Thanks
Tim
NZ8J