Working with the BRTRO-420 reflow oven, it looked like it might be possible to interface with the controller using an inbuilt serial connection to possibly get temperature read outs.

Reverse engineering the serial connection got the following:

Unfortunately trying to interface with this yielded no results. Looking further into the CY96F613 microcontroller datasheets then lead to the fact that this connection is purely used for serial firmware updates. So that was a dead end, apart from recreating the firmware which would effectively brick the machine until it was finished and working.

So where to next? Well the temperature data was sitting right in your face on the front of the machine, it's just a little tricky to get to...