NI-9852 2-Port Low-Speed Fault-Tolerant CAN Module
Земля NI-9852 is a two-port C Series CAN interface module designed for low-speed, fault-tolerant controller area network communication. Each port operates independently and includes a CAN 2.0B-compatible controller and a Philips TJA1054A low-speed/fault-tolerant transceiver.
The module supports data rates up to 125 kbit/s and is designed for applications that require communication to continue under certain bus-wire fault conditions. Typical uses include automotive body electronics, transportation systems, embedded control and industrial network testing.
Key Features of the NI-9852
- Two independent CAN ports
- Low-speed, fault-tolerant CAN physical layer
- Maximum baud rate of 125 kbit/s
- CAN 2.0B-compatible controllers
- Supports 11-bit and 29-bit identifiers
- Philips TJA1054A transceiver on each port
- Independent external supply input for each CAN port
- Software-selectable termination resistance
- CAN bus-line range from -27 VDC to +40 VDC
- Compact C Series form factor
- Designed for CompactRIO FPGA applications
- Suitable for automotive body and comfort networks
NI-9852 Technical Specifications
| Product Model | NI-9852 |
|---|---|
| Product Type | C Series CAN interface module |
| Number of Ports | 2 independent CAN ports |
| CAN Physical Layer | Low-speed/fault-tolerant CAN |
| Maximum Baud Rate | 125 kbit/s |
| CAN Controller | Philips SJA1000, CAN 2.0B compatible |
| Transceiver | Philips TJA1054A |
| Identifier Support | 11-bit and 29-bit CAN identifiers |
| CAN_H and CAN_L Voltage Range | -27 VDC to +40 VDC |
| External Supply Range | +8 VDC to +36 VDC per port |
| Termination Options | 1.11 kΩ or 4.99 kΩ |
| Chassis Power Consumption | 400 mW maximum in active mode |
| Operating Temperature | -40°C to 70°C |
| Weight | Approximately 144 g |
NI-9852 Part Number and Accessories
| Item | Part Number | Описание |
|---|---|---|
| NI-9852 | 779707-01 | Two-port low-speed/fault-tolerant C Series CAN module |
| CAN Cable | Configuration dependent | Connects the module to the low-speed CAN network |
| External DC Supply | User supplied | Provides +8 VDC to +36 VDC transceiver power for each port |
| CompactRIO Chassis | Model dependent | Supported FPGA platform for module operation |
The NI-9852 requires external transceiver power. Both ports can be supplied independently, allowing them to communicate with separate networks when the complete wiring and grounding arrangement supports the intended configuration.
Two Independent CAN Interfaces
CAN0 and CAN1 can be configured for separate buses. This allows one module to monitor two vehicle networks, bridge test configurations or communicate with multiple embedded subsystems.
Software and FPGA logic must manage each port separately, including baud rate, frame handling, termination and operating state.
Fault-Tolerant CAN Communication
Low-speed fault-tolerant CAN is designed to maintain communication under certain single-wire fault conditions. It is commonly used for automotive body functions such as seats, mirrors, doors, lighting and comfort electronics.
Fault tolerance does not eliminate the need for correct wiring, network termination and electrical protection. The complete system must remain within the transceiver and module ratings.
NI-9852 Applications
- Automotive body-network testing
- Vehicle comfort-system development
- Low-speed CAN monitoring
- CAN frame generation and simulation
- Embedded controller validation
- Hardware-in-the-loop testing
- Transportation electronics
- Industrial CAN communication
- Network fault investigation
- Dual-bus data logging
Automotive Body Electronics
The module is suited to low-speed networks connecting door controls, mirrors, seats and other vehicle functions. Test applications can transmit and receive frames while monitoring controller responses.
FPGA-Based CAN Testing
When used with CompactRIO FPGA hardware, CAN processing can be coordinated with other digital, analog and timing operations. This is useful when network events must be linked to physical measurements or deterministic control actions.
NI-9852 Installation Workflow
Step 1: Confirm Chassis Compatibility
Verify that the CompactRIO target and installed software support FPGA operation with the NI-9852.
Step 2: Install the Module
Power down the system and insert the NI-9852 into a supported C Series slot.
Step 3: Wire the CAN Networks
Connect CAN_H, CAN_L, common and the required external supply for each port. Confirm polarity before applying power.
Step 4: Configure Termination
Select the required low-speed/fault-tolerant termination according to the network design.
Step 5: Configure the CAN Interface
Set the baud rate, frame identifiers and port behavior through the applicable CompactRIO FPGA software.
Step 6: Validate Communication
Begin with a known CAN device or analyzer and verify transmitted and received frames before connecting the complete system.
NI-9852 Troubleshooting
The CAN port does not communicate
Check the +8 VDC to +36 VDC transceiver supply, CAN_H and CAN_L wiring, common reference and configured baud rate.
Frames contain errors
Confirm that every network device uses the same baud rate. Inspect termination, cable length, grounding and electrical noise.
One port works but the other does not
Check the external supply and wiring for the affected port. Each CAN interface has its own supply connections and configuration.
The module is not available in the project
Verify CompactRIO hardware support and install the applicable NI CompactRIO and FPGA software versions.
Communication fails during a fault test
Confirm that the applied fault is within the supported low-speed/fault-tolerant CAN behavior and does not exceed the permitted bus-line voltage range.
NI-9852 Comparison
| Модель | Physical Layer | Best Suited For |
|---|---|---|
| NI-9852 | Two-port low-speed/fault-tolerant CAN, 125 kbit/s | Automotive body and comfort networks |
| NI-9853 | Two-port high-speed CAN | High-speed automotive and industrial CAN networks |
| NI-9862 | High-speed CAN/XNET interface | Applications requiring the NI-XNET architecture |
Recommended Related Products
- NI-9852 Low-Speed Fault-Tolerant CAN Module
- NI-9853 High-Speed CAN Module
- NI-9862 High-Speed CAN Interface
- View More NI CompactRIO Products
Frequently Asked Questions
What is the NI-9852?
The NI-9852 is a two-port C Series interface for low-speed, fault-tolerant CAN networks.
What is its maximum baud rate?
The maximum supported baud rate is 125 kbit/s.
Does the NI-9852 support extended CAN identifiers?
Yes. Its CAN 2.0B-compatible controllers support both 11-bit and 29-bit identifiers.
Does the module require external power?
Yes. Each CAN transceiver requires an external supply between +8 VDC and +36 VDC.
What is the NI-9852 part number?
The standard ordering part number is 779707-01.
Request a Quote for the NI-9852
Contact us for current pricing and availability for the NI-9852 2-Port Low-Speed Fault-Tolerant CAN Module. We can also help identify compatible CompactRIO hardware and alternative CAN interfaces.
