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Interface Systems

» Avionic interface unit » Avionic interface card

Communication interface system

5 Pin Audio ConnectorsThe communication interface system is an on-board system that receives message frames over a RS-422 communication link from other subsystems. The system is Fault-tolerant by configuring two identical cards that are interconnected through stackable euro-connectors. An FPGA is provided on the Micro-controller board, to retain a data encryption algorithm. The system software performs redundancy management by using I2C and SPI links that interconnect the two controllers, the FPGA and the RTC devices. Based on the messages received from OBC, the communication interface system activates the encryption algorithm configured in the FPGA and the specified Digital I/O’s are activated to drive relays. The system has a special feature implemented that makes it defunct in the event of it being tampered.

Communication interface system interfaces 44 Digital inputs and has to drive 8 relays through 12 Digital outputs.
Asynchronous Baud rate selection can be done through Firmware and hardwire jumpers
The system also has a power supply module which accepts input DC voltage 28 ± 5V and generates + 5V, ±15V and 28V required for the circuitry inside.
The power supply module includes EMI filters for meeting the EMI environment.
Communication interface system unit consists of 3 cards, two CPU cards and one power card.

Features:

Built with Silicon C8051F120 – 25 MHz , 100 MIPS CPU
The Spartan-II user-programmable gate array XC2S200 is configured to meet the requirement.
External circuit to detect Tamper
External MCU supervisory circuitry with Watchdog timer
Low power battery operated
RTC clock

 

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