Store Remote Interface Unit

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Product Overview

The Stores Remote Interface Unit (SRIU) serves as the interface between the payloads on the aircraft and the flight control computer and power distribution units. SRIU transfers discrete or analog signals to be transmitted to payloads by communicating with the flight control computer over serial communication channels. SRIU controls the electrical power supply needed by the payloads by controlling the power distribution unit according to the commands it receives from the flight control computer. However, the SRIU does not act as a power source in providing electrical power to payloads.

SRIU provides the electrical and firmware requirements specified in the MIL-STD-1760C and MIL-STD-704E standards. The SRIU has a dual-redundant 1553 bus, 4 configurable RS-422/485 lines, 75 discrete output channels and 10 discrete input channels. The discrete inputs of the SRIUs is designed to be isolated from each other. An error or malfunction occurring in any discrete channel does not affect other channels. The SRIU operates at a nominal voltage of 28V. The SRIU shall have hold-up capability against power interruptions as defined in MIL-STD-704E.

• FPGA based design

• Compliant with MIL-STD-1760C standard

• Isolated discrete inputs

• Emergency/Selective Jettison

• Redundancy in Jettison function

• PBIT/IBIT/CBIT

• DO-254 DAL A compliant

• Aerial Vehicle Remote Control Unit

• Mission and Carriage Store Interface

Interfaces

• 5 Open/Ground Discrete Output with max. 0.2A

• 15 Open/Ground Discrete Output with max. 0.1A

• 5 Open/Ground Discrete Input with max. 0.1A

• 45 Open/Supply Discrete Output with max. 0.1A

• 10 Open/Supply Discrete Output with max. 0.2A

• 5 Open/Supply Discrete Input with max. 0.1A

• 4 RS-422/RS-485 serial interface

• 1 dual-redundant MIL-STD-1553 bus

Electrical and Mechanical 

• Power: 16.5 VDC – 32.5 VDC

• Nominal Supply Voltage: 28 VDC

• Weight: 2.5 kg

• Dimension (L x W x H) (mm): 140 x 180 x 112

Environmental 

• Operating Temperature: -40°C to +85°C

• Operating Altitude: 45,000 ft

• RTCA/DO-254

• RTCA/DO-160G

• MIL-STD-810G

• MIL-STD-461F

• MIL-STD-704E

• MIL-STD-202

• MIL-STD-1760C

Current Status

TRL 4/9

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