A question about where is the SCI port on the new Scooba 230 lead to discovery of how to enter the Built in Test mode. The Scooba 230 should have the battery charged and in place and the power supply disconnected to enter into the test program. By pressing and holding both the Power and Clean buttons until the ascending and descending tones stop will place the 230 into Test 0 - LEDs test, pressing the Clean button will advance to the next test, while pressing the Pwr button will take you back to the previous test. The tests check bumper sensors, cliff sensors, liquid pump, vacuum motor, drive wheels, and other tests that I haven't figured out yet.
I suspect that the charging jack may also serve as the serial interface but until disassembly of the 230 is discovered that suspicion is not proven.