While most of the answers that forum members have given are correct, here is different suggestion.
In case you donot want to use Temperature on one of the Thermocouples as a criteria to start exposure time etc in the Kaye VAlidtor and want to use a relay from the Autoclave to start / stop a certain step then -----you can configure one of the SIM channels for a Contact Input during preparation of the setup. This contact input then can be set as the criteria in Setup file for starting / stopping a certain step viz. Exposure cycle.
The contact output from the Autoclave that you refer to, can then be wired up to this channel in the SIM.
Hope this will be helpful.