GST I-9303 addressable dual I/O module, with a microprocessor, can communicate with FACP, monitor power supply, judge the logic state of input signal, control output and state indicators. The module occupies two addresses, and each address can independently receive start command from FACP, close the relative relay and light the indicator. Each address corresponds to one input. After receiving feedback signal from a device, the module transmits feedback signal to FACP in the way of corresponding address. It can be used as two single input/output modules.