If its an S2 Turbo then you'll find a ready made performance in Bank 1, Perf #10 which, if I recall correctly, transmits on either 1 or 16 and receives on 1-16 via MIDI IN and OUT 1.
The first page of PERF TRACKS will tell you what the MIDI OUT channel is. To view and change the MIDI IN tracks, just press the MIDI IN button in the SOURCE column.
Chris