1. Apparatus for automatically writing program instructions into a program memory, which is used to store program instructions that regulate operation of a processor, which is located in a processor controlled parameter measuring system, where said parameter measuring system is equipped with a port that receives a data collection probe used to collect sensor data to enable said processor to measure a parameter whose characteristics are monitored by said data collection probe connected to said port, comprising: means, connected to said port, for automatically determining whether said data collection probe is connected to said port; means, responsive to said determining means indicating that said data collection probe is connected to said port, for receiving data input to said port as sensor data for use by said processor to measure said parameter whose characteristics are monitored by said data collection probe: means, responsive to said determining means indicating that said data collection probe is not connected to said port, for receiving data input to said port as program instructions for use by said system to regulate the operation of said processor; and means for storing said received program instructions in said program memory.