External Sensor Conversion Code

The message from the external sensor contain measurement values in ACCII/ While these are used directly in the display, they need to be converted to binary for the dial, even though its command is in ASCII.
Although the external message values are compatable with the display, decimal points may need to be inserted.
The inputs, Mem_Addr and DP_Code, come from the EEPROM table. The output DecData goes to Update for sending to the dial.