PSK-31 and FT-897?

Hallo Hams! A little OT: Is there anybody out there using the FT-897 in digi-modes? I want to know, if I must use DIG (with PSK31-U or PSK31-L) or USB resp. LSB to transmit PSK-31-signals. I tried PSK-transmitting during the last three days, but nobody gave me an answer to my CQ...! TNX in advance! Peter, DL3VPZ