CB2
8 CANBus Channels, J1939 Protocol
The CB2 is an NAI Configurable Open Systems Architecture™ (COSA®) module that delivers rugged, high-density CAN bus communications. Designed for seamless integration with NAI embedded boards and systems, the CB2 features eight independent, galvanically-isolated channels, each of which can be individually programmed and configured to support a wide range of communication requirements.
The CB2 provided full SAE J1939 protocol/stack support, including Transport/DataLink layers and Address Claim, making it well-suited for applications such as vehicle and engine control and monitoring, equipment networking, avionics integration for mission and vehicle control, and general control and monitoring of defense subsystems.
The CB2 supports data rates up to 1 Mbps (per ISO 11898-1/-2), features Initiated Built-in-Test (IBIT), and integrates seamlessly within the NAI COSA® ecosystem for modular, field-proven embedded systems.
Features
- Eight independent galvanically-isolated transceiver channels
- Implements classical CAN per ISO 11898-1 and ISO 11898-2, supporting data rates up to 1 Mbps per channel
- SAE J1939 protocol stack support (including J1939-21, J1939-81)
- Supports 11-bit (standard) and 29-bit (extended) CAN identifiers.
- Built-in error detection and fault confinement per ISO 11898 for reliable network operation
- Error status registers and Initiated Built-In-Test (IBIT) self-test (loopback) mode
- Optimized for NAI COSA SerDes system integration, supporting modular embedded architectures
- Number of Channels: 8 Transceiver Channels (galvanically isolated)
- CAN Protocol: Version SAE J1939
- Data Rate: Typically limited to 500 kbps depending on implementation
- Data Length: Up to 1785 bytes
- Power: 210 mA @ 5 V per channel typical
- Weight: 1.5 oz. (42 g)
Core Supported Standards
| Standard/Spec | Definition | CB2 |
| ISO 11898-1 | Underlying classical CAN DataLink layer | Yes |
| ISO 11898-2 | High-speed CAN physical layer (support up to 1 Mbps) | Yes |
| SAE J1939 (parent) | Standardized CANbus communications protocol for vehicle and equipment ECUs | Yes |
| SAE J1939-21 | J1939 DataLink & TP layer | Yes |
| SAE J1939-81 | Address-claim arbitration (Networking Management) | Yes |
| SAE J1939-82 | Compliance tests for J1939 ECUs (IP supplier self-compliance - not performed by NAI) | Partial (via IP supplier validation) |
docs.naii.com Link
9/10/2025 7:56:25 AM
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