Been using UiView and TS-2000 TNC for several year without an issue. Are you sure your serial communicating with the TS-2000. You should see PKT and PC in the upper right hand corner the the display if your computer, UiView the the TS-2000 are communicating. Check TS-2000 Menu item 55 is ON and item 56 is set to correct COM speed (ie 57600bps). Set UiView Comm Setup to Baud Rate=57k6, Parity=None, Data Bits=8, Stop Bits=1, Binary Filter, Com Port you are using (ie 1) and Host Mode=KISS. Good Luck
73, Lucky W7CNK
Note...The TS-2000 requires Hardware Flow Control (ie CTS - RTS)