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FTJ

1 Channel, MIL-STD-1553/1760 Communications Interface

Based on the MIL-STD-1553 signal and interface backbone, MIL-STD-1760 defines a standardized electrical interface to address additional aircraft weapons stores management and as such, includes some special requirements. The FTJ module meets the operational requirements within the general specifications of MIL-STD-1760 as applied to an integrated I/O function module, and include special designed holt transceivers to ensure signal parameter operation and integrity.

Module FTJ provides programmable 1-channel, dual-redundant and transformer-coupled interface.

Features
  • Independent (dual-redundant) interface channels: Bus Controller (BC), Remote Terminal (RT), and Bus Monitor (BM) operation
  • Support for RT and BM combination
  • 64 words on-board memory/channel
  • IP-core register-compatible with DDC™ family of devices
  • Automatic message return supported
  • Automatic message retry
  • Multiple message processing
  • Hardware acceleration for rapid setup/message Tx/Rx

Specifications
  • Number of Channels: 1 Transformer-Coupled Channel
  • IP Core: HOLT IP-core register compatible/hardware acceleration for rapid setup, transmission and/or reception of packets.
  • Onboard RAM: 64K words onboard memory per channel.
  • Operational Modes: Bus Controller (BC), Remote Terminal (RT), Bus Monitor (BM), or BM/RT
  • Output Signal: At 28 Vp-p, as per MIL-STD-1553 & MIL-STD-1760
  • Power: 5 VDC at 600 mA estimated at 100% duty cycle (TBV)
  • Weight: 1.5 oz. (42 g)

The FTJ provides MIL-STD-1553 serial communications with MIL-STD-1760 interface compatibility. MIL-STD-1760 was developed primarily to address additional aircraft weapons stores management and as such, includes some special requirements. The FTJ includes additional design and operational parameters to address these special requirements. The FTJ meets the general operational requirements of operating within the general specifications of MIL-STD-1760 as applied to an integrated I/O function module.

MIL-STD-1760 signal requirements

Though based on the MIL-STD-1553 signal and interface backbone, MIL-STD-1760 defines some tighter tolerances on signal parameters. The FTJ includes special designed Holt transceivers to ensure signal parameter operation and integrity.

First communication

The FTJ provide a user-programmable EEPROM. When auto-initialized as an RT, the channel can respond on the bus with valid messages (as defined by the 1760 standard) containing pre-defined data (per sub-address) within 150 msec. of power-on per the MIL-1760 specification requirement (measured typical response is within 100 msec.).

RT Address Interface

Five binary weighted address lines plus one parity line and a common return line, are provided. They are used to assign the store's MIL-STD-1553 terminal address, between 0 and 30, for data bus communication. Each channel has its own set of hardwired RT address signal pins. Each channel checks for odd parity and is set via external address lines. RT Address is latched on boot-up or reset. Contact factory for special hardware override to lockout host software address programming (RTxLOCK option).

Interlock

A low impedance Interlock and Interlock RTN circuit path option is provided for the module for those application requiring a continuity path. Interlock and other identified Discrete signals are expected to be monitored and/or controlled by other means depending on the safety requirements of the aircraft. Contact factory.

Block Diagram

(Click diagram to enlarge)

Documentation
7/8/2019 10:04:48 AM
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