Raj has been designing a soldering station that would support Weller’s RT type tips with temperature sensor and heater built into them. A stereo-type jack on the iron connects them to the soldering station cable.
So far Raj has reverse engineered the pinout of the jack and how to read the temperature. The tip has an integrated k-type thermocouple that should be read when power is not being supplied to the heater.
Via the forum.