Hi Dave,
Yes, the PC Client must use CAT, so COM2 on the radio RRC must be connected to the TS-480's serial
port.
If you are not using COM1 on the RRC, then just loop back the CAT through COM1 and connect that to
the band decoder. You place COM1 in mode-6 and make sure you pay attention to the pinout on COM1,
since it is a mirror image of COM2.
If you are already using COM1, then you have a choice of either moving that device to a separate serial
device server, or trying a Y-cable on COM1 or COM2 to see if it works (no guarantee).
73,
Mitch DJ0QN / K7DX