Flex1553 PCI-Express Four dual-redundant MIL-STD-1553  board

Multiple Protocols


1553 EBR



Serial ASYNC RS4-22/485

Discrete I/O

The Flex1553-PCIe is a PCI Express card supporting 1, 2 or 4 Dual Redundant MIL-STD-1553 buses, 1553 Enhanced Bit Rate, and more with precise timing and flexible programming.

Breakout box I/O connectors

The Flex1553 PCIe card interconnects with the connect panel. The connect panel is a 1U ruggedized rack-mountable panel that provides eight MIL-1553 Twinax BNC connectors. It also provides large DB connectors for easy user cabling of ASYNC, ARINC 429, Single or Differential Discrete I/O, Sync in/out and IRIG-B signals.



  • 1, 2 or 4 Dual Redundant MIL-STD-1553 buses
  • Concurrent BC/BM/RTs
  • MIL-STD-1553 EBR (Enhanced Bit Rate) at 10 Mbps
  • MIL-STD-1760 CRC
  • precise 64-bit timetag
  • 12.5 nanosecond time-tag on MIL1553 and EBR
  • Advanced transaction counters and error counters
  • Discrete output line triggered on error
  • Late Update detection
  • BC/BM/RT’s started time
  • Major frame start and stop on time-tag
  • Frame rate can be controlled by an external clock 
  • •Conditional branch to minor frame
  • Conditional branch on Discrete I/O trigger
  • Minor frame rate up to 6553 ms
  • Minor frame sent on modulo
  • Minor frame repeat count
  • Minor frame duration (independent for each minor frame) 
  • Message sent on modulo (1 to 256)
  • Message sent on gap or on fixed delay
  • Message command real-time update
  • Error injection:
    • Command/status address override
    • Bit count error
    • Sync pattern error
    • Transmit on alternate bus
    • Transmit on both buses
    • Parity error
    • Word count error
    • Manchester error
    • Supersed command
    • Force RT to not respond
    • Force RT to respond
    • Word gap error in 1/8 bit time
    • Do not send command
  • Error detection:
    • Message overlap
    • Manchester error
    • Parity error
    • Extra bit error
    • RT response too fast
    • Data unexpected error
    • Bad sync error
    • Data length error
    • Status address error
    • RT-RT data error

1553 EBR


Discrete I/O

Serial ASYNC RS-422 / 485

  • up to 4Tx / 4 Rx in addition to  4 Dual Redundant MIL-STD-1553 
  • 10 Mbps Enhance Bit Rate (EBR)
  • 4 ARINC 429 ports (2Tx + 2 Rx)
  • Prog. Bit rate from 4 to 125 kbps
  • Errors injection
    • Parity error
    • Bit count error
  • Errors detection
    • Parity error
  • precise 64-bit timetag
  • 8 Serial ASYNC RS-422/485 ports (4Tx + 4 Rx)
  • 200 bps to 10 Mbps
  • Support for Rockwell-Collins CSDB protocol
  • Errors injection
    • Parity error
    • Bit count error
  • Errors detection
    • Parity error
    • Stop bit error
  • precise 64-bit time tag
  • 32 Discrete I/O with FIFO and timetags dedicated ports (16Tx + 16 Rx)
  • Support for differential RS-422, single TLL or 28V avionic discrete 
  • Up to 10 Mbps

MX Foundation 4 API

The MX Foundation 4 API library provides high-level abstraction of hardware and allows to easily control mixed protocols and I/O modules on one or multiple carrier boards. MX Foundation is available for Windows, Linux and others operating systems.

MAXIM Graphical User Interface

MAXIM addresses the need for various test & measurement solutions that engineers and technicians can easily use and customize to fit their specific requirements.


MAXIM provides multi-protocol support in a single, powerful and easy-to-use software. With MAXIM, there is no need to buy, learn and maintain several different simulation and analysis software solutions. Whether your project involves designing, validation, manufacturing, simulation, testing, maintenance, certification or any other process, you need an integrated and flexible solution. MAXIM’s “project-based” environment is easy-to-use and ready for expansion to support a variety of T&M communication protocols and legacy I/O.


MAXIM covers a wide range of needs when handling real-time data information such as message scheduling, recording, playback, monitoring, real-time graphics and data analysis.


Bus type

  • PCI-Express x1 Gen1  Standard


  • SYNC IN/OUT: Synchronization between multiple boards

Physical dimensions

  • PCI Express short card 
  • 98 mm x 162 mm

External connector type and location

  • Two VHDCI 68-pin connectors on front face plate        


  • Standard Operating Temperature: 0°C to 70°C
  • Storage Temperature: -55°C to 100°C
  • Relative Humidity for operation: 0 to 95% (non-condensing)

Reliability MTBF (MIL-HDBK-217 FN2, 30 °C)

  • 241,500 hours

Maximum power consumption (carrier board only without mezzanine modules)

  • 12 Watts


Part Number



Flex1553 PCIe card with connectors break out box supporting 1 dual redundant MIL-STD-1553 bus


Flex1553 PCIe card with connectors break out box supporting 2 dual redundant MIL-STD-1553 bus


Flex1553 PCIe card with connectors break out box supporting 4 dual redundant MIL-STD-1553 bus


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