Abstract: An electronic control system and an electronic control are disclosed. The electronic control system comprises a plurality of electronic controls communicating in a half-duplex mode. Each of the electronic controls has a computer with a store program and communicates with other electronic controls and with a host computer only in the event one of the parameters in the store program exceeds its pre-set range. Further, the electronic control system has a repeater which controls the half-duplex communication mechanism to achieve a 100% duty cycle. Finally, a programmable gain and offset circuit is disclosed.