CANBus Communications


CANBus Communications

Modules CB1, CB2, and CB3 are NAI’s latest generation 8-channel CANBus Communication Modules. These sophisticated serial bus system modules are used on our rugged COTS Multifunction Embedded I/O Boards, Single Board Computers (SBCs), and Configurable Systems offered in OpenVPX, cPCI, VME, and PCI/PCIe configurations.

NAI's Smart Function Modules provide uniquely flexible, mix & match customization options for use with our COTS hardware. Learn More

Modules CB1, CB2, and CB3

The serial bus system with real-time capabilities is the subject of the ISO 11898 International Standard and covers the lowest two layers of the ISO/OSI Reference Model. Our CANBus modules provide independent, isolated channels of CAN serial data bus links, conforming to the ISO 11898 International Standard. All CAN nodes are able to transmit data and several CAN nodes can request the bus simultaneously.

The CB1 module supports CAN 2.0 A and B protocol. Each channel is independently configurable.

The CB2 module stack design conforms to the SAE J1939 protocol specification with address claiming option: Transport and DataLink layers IAW SAE, Section J1939/21.

The CB3 module design supports both CANBus 2.0 A and B protocol and CanBus SAE J1939 protocol. Each channel can be set for either protocol.

CB1 Block Diagram


  • Eight independent, galvanically-isolated channels implemented with Bosch® FPGA core
  • Fully compliant ANSI C network: Transport and DataLink layers
  • Addressing settings: self-configurable, non-configurable, or command-configurable
  • Adjustable baud rate with speeds up to 1 Mbit/sec
  • MilCAN compliant (CB1 CAN 2.0 base foundation with higher level protocol integration-ready)
  • Continuous Background Built-in-Test (BIT) status for real-time channel health
  • Error status registers
  • Self-test mode


Click below for manuals and specifications:

CB18-CH CANBus, CAN 2.0 A/B ProtocolN/AModule Manual - CB1-3
CB28-CH CANBus, J1939 ProtocolN/AModule Manual - CB1-3
CB38-CH CANBus, CAN 2.0 A/B Protocol or J1939 ProtocolN/AModule Manual - CB1-3

Function module(s) featured in products below:

ModelBoard TypeBoard ArchitectureFunction Module SlotsSizeEthernetMaster / SlaveOn Board ReferenceOther
75G53U cPCIARM / Xilinx® Zynq3 2 x GbBoth   
64G5VMEARM / Xilinx® Zynq6 2 x GbBoth YUser application ARM processor capability
68G53U OpenVPXDual Core ARM® Cortex® A9 @ 800 MHz3 2 x GbBoth  Slot profile: SLT3-PER-1U-14.3.3 / Module profile: MOD3-PER-1U-16.3.3-2
79G5PCIe 31/2   N/A 
ModelBoard TypeProcessorFunction Module SlotsMaximum MemoryMaximum StorageVideo OptionsEthernetAvailable O/S
75ARM13U cPCI SBCXilinx® Zynq 7015 with Dual Core ARM® Cortex® A9 @ 800 MHz3512 MB DDR3L SDRAM32 GB SATAII NAND FlashN/A2 x GbWind River® VxWorks®, Xilinx® PetaLinux OS and DDC-I Deos™ support
68ARM13U OpenVPX SBCXlilinx® Zynq 7015 & 7016 w/Dual Core ARM® Cortex®-A9 @800MHz3512 MB DDR3 SDRAM32 GB SATAII NAND FlashN/A2 x GbWind River®, VxWorks® and Xilinx® PetaLinux OS Support
75PPC13U cPCI SBCNXP® QorIQ® P2041 Quad-Core e500mc Processor @ 1.2 GHz28 GB DDR3L SDRAM32 GB SATAII NAND FlashN/A2 x GbWind River® VxWorks®
75INT23U cPCI SBCDual Core Intel® i7 3517UE @ 1.5 GHz28 GB DDR3L SDRAM32 GB SATAII NAND FlashVGA, HDMI, LVDS, or DVI2 x GbCentOS, Red Hat®, Linux®, and Windows® Embedded Standard 7
64ARM16U VME SBCXilinx® Zynq Dual Core ARM® Cortex® A9 @ 800 MHz6 + AC Ref512 MB DDR3L SDRAM32 GB SATAII NAND FlashN/A2 x GbWind River® VxWorks® and Xilinx® PetaLinux OS support
68PPC23U OpenVPX SBCNXP® QorIQ® T2080 Quad Core @1.5 GHz2 8 GB DDR3 SDRAM32 GB SATAII NAND FlashN/A2 x GbWind River® VxWorks®
ModelPhotoBoard TypeDimensions w/Connectors (w x h x d)Volume w/Connectors (in3)Weight / lbs (fully populated)Est. Typ. Power Dissipation (W)# of Board SlotsFunction Module SlotsMax I/O PinsEthernet
NIU1AModule6.8" x 1.5" x 2.5"28.90<1.25 to 15 WN/A1592 x Gb
NIU2AModule7.0" x 3.0" x 2.5"52.5<2.755 to 25 WN/A21322 x Gb
SIU313U4.71" x 2.35" x 8.71"96.41<5.07 to 35 W131322 x Gb
SIU333U4.71" x 4.78" x 8.71"196.10<10.014 to 75 W393222 x Gb
SIU353U7.13" x 4.78" x 8.71"296.85<15.025 to 100 W5155122 x Gb