The other way around works for sure, see page 54 of the RC-2000 manual:"CONCERNING THE TM-D700A/E PANELThe RC-2000 control panel can be used in place of theTM-D700A/E panel. Switch the TM-D700A/E OFF thenremove the TM-D700A/E panel. Plug the RC-2000panel and press (POWER). The RC-2000 panelautomatically detects the TM-D700A/E transceiver andwill operate the same as the original TM-D700A/E panel."73,Mitch DJ0QN