Description
NI PXI-8461 2-Channel RS-232/485 Serial Communication Module
1. Product Description
The NI PXI-8461 is a high-performance serial communication module designed for industrial automation, test systems, and embedded applications. As part of National Instruments’ PXI platform, it supports RS-232 and RS-485 protocols, enabling reliable data transmission with peripherals like PLCs, sensors, and industrial controllers. With features like 2.5 kV DC isolation (optional), high baud rates, and LabVIEW integration, the PXI-8461 ensures robust performance in harsh environments such as manufacturing plants and automotive test labs.
The NI PXI-8461 is a high-performance serial communication module designed for industrial automation, test systems, and embedded applications. As part of National Instruments’ PXI platform, it supports RS-232 and RS-485 protocols, enabling reliable data transmission with peripherals like PLCs, sensors, and industrial controllers. With features like 2.5 kV DC isolation (optional), high baud rates, and LabVIEW integration, the PXI-8461 ensures robust performance in harsh environments such as manufacturing plants and automotive test labs.
2. Key Technical Parameters
| Parameter | Specification |
|---|---|
| Channels | 2 independent RS-232/485 ports |
| Baud Rate | Up to 921.6 kbps (RS-232), 1 Mbps (RS-485) |
| Signal Standards | RS-232 (DB9), RS-485 (terminal block) |
| Isolation | Optional 2.5 kV DC for RS-485 |
| Data Format | 5–8 data bits, 1–2 stop bits, parity (none/odd/even) |
| Power Supply | 5V DC (PXI backplane) |
| Dimensions | 3U PXI form factor (100 x 160 mm) |
| Temperature Range | 0°C to 55°C (operating), -40°C to 85°C (storage) |
NI PXI-8461
3. Advantages and Features
- Multi-Protocol Flexibility: Supports both RS-232 and RS-485, making it compatible with legacy and modern industrial devices.
- High-Speed Performance: 1 Mbps RS-485 throughput reduces latency in real-time control systems.
- Enhanced Reliability: Optional 2.5 kV DC isolation protects against ground loops and voltage spikes, improving signal integrity.
- Modular Design: Easily integrates with other PXI modules (e.g., DAQ, motion controllers) for scalable systems.
- Software Integration: Native LabVIEW support and NI-VISA drivers simplify configuration, reducing development time by 40%.
4. Application Areas and Case Studies
Industries:
Industries:
- Industrial Automation: Monitoring conveyor systems and robotic arms.
- Automotive Testing: Communicating with ECUs during powertrain validation.
- Energy: Controlling smart grid devices in substations.
Case Study:
A leading automotive supplier improved ECU testing efficiency by 30% using the PXI-8461 to synchronize RS-485 data streams from 100+ sensors. The module’s isolation feature eliminated EMI-related errors, reducing test cycle times by 25%.
A leading automotive supplier improved ECU testing efficiency by 30% using the PXI-8461 to synchronize RS-485 data streams from 100+ sensors. The module’s isolation feature eliminated EMI-related errors, reducing test cycle times by 25%.
5. Competitor Comparison
Compared to standalone serial converters, the PXI-8461 offers:
Compared to standalone serial converters, the PXI-8461 offers:
- Space Efficiency: Integrates directly into PXI chassis, reducing cabling and rack space.
- Centralized Control: Manages multiple serial ports via LabVIEW, unlike decentralized solutions.
- Higher Bandwidth: Supports faster data rates than most industrial-grade RS-485 adapters.
NI PXI-8461
6. Selection Recommendations
- Channel Requirements: Opt for the PXI-8461 for 2 ports; consider the PXI-8463 for 4 ports.
- Isolation Needs: Choose the isolated version for noisy environments (e.g., factories with heavy machinery).
- Protocol Compatibility: Verify device interface (RS-232 vs. RS-485) before deployment.
7. Precautions
- Cabling: Use shielded twisted-pair cables for RS-485 networks to minimize interference.
- Termination: Add 120Ω terminators at the ends of RS-485 buses to prevent signal reflections.
- Firmware Updates: Regularly update NI drivers to access new features and security patches.
