The MICROLAB 500C instruments perform the same functions as the 500B series except that programming and method storage is performed using a PC and RS232C communication. The computer controls the MICROLAB 500C instrument based on the method selected or one that has been pre-programmed into the instrument's EEPROM (Electronically Erasable Programmable Read-Only Memory). Up to 16 instruments can be daisy-chained and controlled from the host computer.