OmniBus VME™ Interface for Discrete

Description

OmniBus Discrete refers to the digital IO interface available for all OmniBus platforms. It provides interface capability for standard avionics discretes and general-purpose digital IO.

OmniBus Discrete has many programmable features that facilitate its use for sensing, controlling, and testing DC circuits at voltages up to 40 VDC. Each of the 32 IO lines may be configured as as an input and/or an output. The input of an IO line can be used in conjunction with its output for built-in test (i.e., to verify the state of the output) or to sense the state of an ORed circuit. Inputs can be configured as series (voltage/open or voltage/ground) or shunt (open/ground) with a programmable threshold voltage suitable for use from TTL level through 28 VDC. The debounce feature filters the input to eliminate excessive transitions. Outputs are open collector and can sink up to 200 mA. Protection circuits permit switching of inductive loads and will shut down the output driver in over-current or over-temperature conditions.

Software programs can be easily developed using the application program interface (API). Functions are provided for configuration, reading inputs, and setting outputs. Interrupts can be enabled to notify the program of transitions on inputs and faults on outputs.

The OmniBus Discrete page contains complete information on discrete I/O functionality for OmniBus products.

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