Hi Bob,
That is what I wrote before
Anyway, there are various cables available for the SignaLink, so I would build or buy one that has an RJ-45,
such as for the TS-480. Then set the red strappings for the TS-480 and you are in business. I don't know
much about Icom cables. If yours has an RJ-45, then there is no reason why you can't use that as well.
The diagrams are in the RemoteRig manual at the end of each section.
I need to run to the airport, so I don't have time now to look this up myself.
73,
Mitch DJ0QN / K7DX