Listed below are the radios that are supported within DXbase.  Some radios do not provide the capability to read or set split mode using the RS232 interface.  In that case, only VFOa will be used.  Otherwise, both VFOa and VFOb can be set/read.  Consult your radio manual if you have a question about this. If you use two radios with DXbase, a separate serial port is required for each.