Store Remote Interface Unit
SRIUs serve as the interface unit between the aircraft control computer and aircraft stations/stores by transferring its digital serial input messages from the aircraft control computer to the stores as discrete signals. SRIU also controls the power requirements of 4 stations, switching internal relays on and off positions, depending on messages from the aircraft control computer.
The SRIU will communicate with the Avionic Central Control Computer over MIL-STD-1553, RS-422/485 and discrete channels. The SRIU will have a dual-redundant 1553 bus, 4 configurable RS-422/485 lines, 75 discrete output channels and 10 discrete input channels. The SRIU will operate at a nominal voltage of 28V. The SRIU shall have hold-up capability against power interruptions as defined in MIL-STD-704E.