BE-33 PLT HAS AN NMAC WITH C210 DEPARTING FCM VFR; BUT NOT FOLLOWING THE ASSIGNED COURSE.

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I HAD RPTED '13 MI NW; INBOUND WITH ATIS INFO' AND WAS GIVEN THE CUSTOMARY RPT 3 MI NW FOR R DOWNWIND RWY 28R. IT WASN'T UNTIL ABOUT 1/2 WAY INBOUND THAT I FIRST HEARD TWR ASK THE OTHER ACFT (JUST DEPARTING RWY 28R WBOUND) TO RECYCLE THEIR XPONDER. THERE WAS A SECOND CALL TO RECYCLE BECAUSE THE DEPARTING ACFT WAS NOT REPEATING OR ACKNOWLEDGING ANY XMISSIONS. I WAS 3.3 MI NW WHEN THE CTLR BLUNTLY ASKED THE DEPARTING ACFT (WHO WAS SUPPOSED TO BE WBOUND) FOR THEIR PRESENT LOCATION. AT THIS TIME THAT PLT REPLIED THAT HE WAS 3 MI NW. I STARTED TO SCAN THE AREA AS I WAS NOW DSNDING TO PATTERN ALT BUT WAS STILL AT 2200 FT MSL. I INSTANTLY SPOTTED THE CESSNA CENTURION CLBING DIRECTLY TOWARD ME. I KEYED THE MIKE; AND QUICKLY BROADCAST 'TURN R; TURN R' AS I BANKED TO MY R. THE CESSNA PASSED TO MY L GOING THE OPPOSITE DIRECTION; AND IT DID NOT BANK R UNTIL IT WAS ALMOST ABREAST (ROUGHLY AT MY 10 O'CLOCK POS). I ASSUME PERHAPS THAT THIS WAS WHEN HE FIRST SAW ME. THE SEPARATION WAS BELIEVED TO BE 10 FT VERT; AND LESS THAN 100 FT HORIZ. CONTRIBUTING FACTORS: A BUSY ARPT ENVIRONMENT; DEPARTING ACFT WAS EXPERIENCING AN INOP XPONDER. THIS PLT FAILED TO COMMUNICATE AND/OR REPLY TO THE CTLR'S REQUESTS; AND WAS NOT WHERE HE DECLARED HE WAS GOING. I HAD IMMEDIATELY RPTED CLR OF THE TFC. CONFIRMED MY EVASIVE ACTION WAS TO AVOID THE SAID CESSNA CENTURION WHO WAS NOW NNWBOUND. EVEN AFTER THIS NMAC; THE CESSNA CONTINUED OUTBOUND ONCE AGAIN WITHOUT REPLYING TO THE TWR. THE TWR GAVE ME INSTRUCTION TO 'ENTER R DOWNWIND; AND CLRED TO LAND RWY 28R.' UPON CLRING THE RWY; THE TWR APOLOGIZED FOR THIS MISHAP. THOUGH IT CLRLY WAS NOT THE CTLR'S FAULT. I THANKED THEM FOR THE PRESENCE OF MIND TO ASK FOR THE OTHER ACFT'S PRESENT LOCATION.