To provide a connector apparatus, equipped with an electronic control switch which comprises a switch means for electronically controlling a multi- channel circuit and of which the switch pattern is relatively easily changed.

This connector apparatus is provided with a switching IC, a control IC 35 for controlling the switching IC, a flash memory apparatus 40, and a connector 11 to be connected with a connector in a measuring apparatus side. The IC for 35 control provides a plurality of switching IC, with a switch pattern, based on the data stored in the flash memory apparatus 40. The terminals of the connector 11 are used also for rewriting the data stored in the flash memory apparatus 40.