The model SIU31 is a next generation rugged systems chassis joining the NAI Sensor Interface Unit (SIU) system chassis family pedigree. The SIU31 is configured to support a wide variety of SBC and multifunction I/O boards that can be configured to support a variety of processing, communications and I/O functions that are supported under the NAI Configurable Open Systems Architecture ™ (COSA®) product families.

The SIU31 can function either as a centralized or distributed system. It can also be used to supplement existing legacy systems by easily adding sensor data acquisition as well as general I/O and communication interfaces without expensive legacy chassis and backplane redesign. It has been designed with rugged embedded industrial, military and aerospace applications in mind.

Leveraging NAI’s field-proven, unique modular architecture, the SIU31 supports standard 3U cPCI board-level compatible boards that can be fitted with a wide selection of different Intelligent I/O, motion simulation/measurement and communications functions such as:

This approach provides unprecedented flexibility for supporting existing or new applications where there are specific interfacing requirements. Significant application benefits include:

The SIU31 is designed to meet the following general product specifications and is provided as a reference. Actual configuration and usage may affect size, weight and power (SWaP) specifications. Please contact NAI for discerning/defining SWaP considerations regarding specific program configurations. See additional details herein.

The SIU31 packing materials were designed specifically for transport protection of the SIU31. When receiving the shipment container, inspect packaging for any evidence of physical damage. If damage is evident, it is recommended that the carrier agent is present when opening the shipping container. It is further recommended that all packing material is retained in the event the SIU31 needs to be shipped elsewhere.

An identification label, indicating part number, unique serial number and Ethernet PHY MACs / default IP address(es) is affixed to the system chassis.

Label information provided:

     Unit Level Part Number

     Unit Level Serial Number

     Unit Level Date Code

Also, typically provided with:

     Slot/Board configuration(s) as applicable

     Slot/Board serial numbers and D/C

     Slot/Board IP address / MAC address (if applicable)

Special labeling requirements are also considered (i.e. UID matrix, customer part number, etc.). Contact factory for special labeling requirements.

Inspect the chassis and connectors to ensure that they were not damaged during transit.

The SIU33 is a rugged, aluminum, conduction-cooled chassis that requires proper mounting to a cold-plate or surface that is maintained at 71°C or less. Three mounting holes are provided along each side of the SIU33. Please see the outline and interface drawings below. Note that hardware is not supplied

Unless otherwise specified, the following standard finish, or equivalent per NAI process requirements applies:

Primary input power is supported on the SIU31 via the J3 connector. There are three input power options for the SIU31: 28 VDC, 115/230 1ø VAC or 270 VDC. Two unique power connectors are used; one for the 28 VDC input and one for the 115/230 1ø VAC or 270 VDC input.

Connectors J1 and J2 route the I/O and Ethernet connections from the cPCI slot. The I/O pins from the cPCI Slot-X_P2 connectors of the cPCI card are routed through the backplane to the SIU31 front panel connector. The I/O pin-out information for the J1 and J2 is defined by the configuration of the cPCI boards and function modules fitted to the cPCI boards.

Front Panel Power & Status LED Indicators

Status LED

       NONE (STATUS LED is extinguished).

Power LED

Provided from power supply unit (PSU) or strapped accordingly - SIU31 power “ON” indication

The SIU31 is delivered as a tested unit. All pins and operation have been verified. It is recommended that Power and Ethernet connections be made to verify operation of the boards fitted within the SIU31 by making use of NAI’s Embedded Soft Panel based GUI sample application that can be utilized as a board level “exercising” tool (if the SIU31 card configuration supports). The example process below describes the use of NAI’s Ethernet communications software tool.

For detailed supplement, please visit the NAI web-site specific product page(s).

Notes:

*1 - Designed to meet / Generic Test Reports Available

*2 - Utilizing proper shielded cables and system grounding practices

The Mean Time between Failures is configuration, environment and temperature dependent. Please contact factory regarding calculations based on the specific configuration and program requirements.

The following table provides pin-out data for an SIU31 fitted with an I/O and Communications board. A generic configuration is provided along with an example using the NAI 75G5, a 3U cPCI I/O & Communications Board that can be configured with up to three NAI Intelligent I/O and communication function modules.

In the example, the function modules are:

The following table provides pin-out data for an SIU31 fitted with a Single Board Computer. A generic configuration is provided along with an example using the NAI 75 PPC1, a 3U cPCI Freescale™ QorIQ P2041, PowerPC-based, Single Board Computer, which can be configured with up to two NAI Intelligent I/O and communication function modules.

In the example, the function modules are: