Combination Module: 2 Ch. Dual-Redundant MIL-STD-1553 & 8 Ch. ARINC 429/575 Communications Interfaces
The CM5 provides a combined function alternative which mitigates SWaP-C system integration and configuration challenges. The CM5 function essentially combines two of NAI’s popular functions on a single-slot function module:
MIL-STD-1553 Communications Interface : The CM5 smart function provides a MIL-STD-1553 interface Bus Controller (BC), Remote Terminal (RT) or Bus Monitor (BM) function (programmable per channel). The IP/Core MIL-STD-1553 firmware supports NAI software/API Assisted Mode Capability (AMC).
ARINC 429/575 Communications Interface : The CM5 smart function provides a fully programmable ARINC 429/575 communications interface. ARINC 429 (and legacy ARINC 575) is a data transfer standard for aircraft avionics. It uses a self-clocking, self-synchronizing data bus protocol. The physical connection wires are twisted pairs carrying balanced differential signaling. Data words are 32 bits in length and most messages consist of a single data word. Messages are transmitted at either 12.5 or 100 kbps to other system elements that monitor the bus messages. The transmitter constantly transmits either 32-bit data words or the NULL state. A single-wire pair is limited to one transmitter and no more than 20 receivers. The protocol allows for self-clocking at the receiver end, thus eliminating the need to transmit clocking data.
- Independent (dual-redundant) MIL-STD-1553 interface channels: Bus Controller (BC), Remote Terminal (RT), and Bus Monitor (BM) or RT/BM combined mode operation
- Assisted Mode (AM)
- 64KB onboard memory per channel
- IP-core register-compatible with DDC™ family of devices
- Ability to set message retry policy
- Message scheduling capability
- Asynchronous message capability
- Message FIFO capability
|Number of Channels:||2 Dual-Redundant (Transformer-Coupled)|
|IP Core:||IP-core compatible with DDC™ family of devices. 64KB onboard memory per channel.|
|User Interface:||NAI Assisted Mode Capable (AMC) interface for rapid setup, transmission and/or reception of packets.|
|UI Onboard RAM:||Three 1K words FIFOs per channel|
|Operational Modes:||Programmable as Bus Controller (BC), Remote Terminal (RT), Bus Monitor (BM), or BM/RT|
|Output Signal:||~24 Vp-p, as per MIL-STD-1553|
|Input/Output Format:||Eight channels, programmed for either Rx or Tx per channel|
|Frequency:||100 kHz or 12.5 kHz operation (programmable)|
|Buffers:||255 message FIFO Rx or Tx FIFO buffering or scheduled transmits; SDI/Label Filtering|
|Format:||AR429 or 575 programmable/channel
ARINC 429 reserves bit 32 for parity, while ARINC 575 can use bit 32 for either parity (when BNR) or data (when BCD).
|Signal Levels Specifications||ARINC 429||ARINC 575|
|Mode of Operation||Differential||Differential|
|Data Rate||100 kHz||12.5 kHz|
|Driver Output Signal Level (Min Loaded)||±10.0 V||±10.0 V|
|Receiver Input Voltage Range||-17 V to +17 V||-17 V to +17 V|
|Receiver Input Resistance (Ohms)||15 K||15 K|
|Power:||5 VDC @ 1150 mA
+/-12V @ 0.15 A
MIL-STD-1553, estimated at 100% duty cycle (1-channel)
|Weight:||1.75 oz. (50 g)|
Accelerate Your Time-to-Mission™ With COSA®
NAI’s Configurable Open Systems Architecture™ (COSA®) offers a choice of over 70 smart I/O, communication, and Ethernet switch functions, providing the highest packaging density and greatest flexibility of any multifunction I/O board in the industry. Preexisting, fully-tested functions can be combined quickly and easily in an unlimited number of ways. Each I/O function has dedicated processing, unburdening the system Single Board Computer (SBC) from unnecessary data management overhead.
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