EMB120 FLC GETS CONFUSED OVER APCH CTLR RADAR VECTORING AND HDG ASSIGNED. AFTER A TCASII TA THEY QUERY CTLR AND GET ANOTHER INCORRECT HDG ASSIGNED. APCH CTLR HAD THEIR ASSUMED POS AS N OF LOC RWY 23R WHEN THEY WERE S OF IT.

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THE PROB AROSE DUE TO CONFUSION BTWN CREW AND IMPROPER INSTRUCTIONS FROM APCH. WE WERE DSNDING THROUGH 4000 FT AND GIVEN A HDG OF WHAT I BELIEVED WAS 270 DEGS. THE CAPT BELIEVED THE HDG WAS TO 170 DEGS. THE PURPOSE WAS VECTORS FOR RWY 23R. WHILE TURNING TO 270 DEGS; WE RECEIVED A TA FROM THE TCASII. (NOTE: A TURN TO 170 DEGS WOULD NOT INTERCEPT THE LOC AS WE WERE S OF THE LOC.) WE TOOK EVASIVE ACTION AND BEGAN TO TURN SBOUND AWAY FROM THE TFC; AS WELL AS STOPPING OUR DSCNT. AT THIS TIME APCH ISSUED US A TURN TO HDG 130 DEGS. FOLLOWING THAT WE WERE GIVEN A HDG OF 210 DEGS TO INTERCEPT. THIS HDG WOULD NEVER INTERCEPT AS WE WERE S OF THE LOC. WE WERE THEN TURNED OVER TO TWR. THE TWR IMMEDIATELY QUERIED OUR POS AND TOLD US WE WERE LINING UP FOR RWY 23L. AT THIS POINT THE RWY WAS IN SIGHT BUT WE WERE CLRED TO LAND ON RWY 23L INSTEAD OF RWY 23R. WE COMPLIED. I BELIEVE THE CONFUSION ON THE FINAL WAS DUE TO CREW FATIGUE AND THE LACK OF TIME AVAILABLE TO QUERY ATC PRIOR TO BEING HANDED OFF. IN ADDITION; I BELIEVE APCH WAS UNAWARE OF OUR POS OR MISTAKEN AND BELIEVED WE WERE N OF COURSE RATHER THAN S. SUPPLEMENTAL INFO FROM ACN 367017: BEING RADAR VECTORED FOR THE ILS RWY 23R AT TYS; A MISCOM OCCURRED BTWN THE 2 PLTS AND THE CTLR. I PERCEIVED AS INSTRUCTIONS TO TURN TO HDG 270 DEGS. I ASKED THE FO TO VERIFY THAT THIS WAS THE CORRECT HDG. THE CTLR WAS BUSY WITH OTHER ACFT. I BELIEVE THAT THIS OCCURRED BECAUSE THE CTLR WAS QUITE BUSY AS WELL AS THE FLC BEING FATIGUED FROM A LONG 2 DAY TRIP.