Get temperature measurements from port. This key retrieves temperature data from the PIC card. Use the index field as follows: 0 - the X-Bar FPGA (PIC7+) 1,2 - the IO Modules 4 - the X-Bar board temp (POD6+) 11,12 - the Processor Modules The temperature is returned in degrees Celsius. or -1 = N/A, -3 = Error