I opened the device and I was delighted to see it has factory calibration pads. it provides contacts for what proved to be measurement activation, GND, serial clock, serial data and VCC. these are marked in the silkscreen as A, G, C, D and V respectively.
Petertux, a 43oh member, documents his process on reverse engineering a Micronix Plus pyrometer he had lying around. He was thrilled to find out that the device had its debug pads exposed. With a little Saleae Logic help, he was able to interface the pyrometer to a MSP430.
Follow his thread in the 43oh Forum for more in depth analysis.