NI PXI-8433/4 RS485/RS422 High-Performance, Isolated 4-Port Serial Interface

The NI PXI-8433/4 is a high-performance 4-port serial interface module for PXI and PXI Express chassis, delivering isolated RS485 and RS422 communication in industrial automation and test environments. The module supports both 2-wire half-duplex and 4-wire full-duplex transceiver modes, with data rates up to 2000 kbaud in two-wire auto control mode. High-speed DMA transfers, multiprocessor support, and multithreading capabilities enable reliable performance in demanding applications. The module integrates transparently as standard COM ports, ensuring immediate compatibility with existing serial applications across Visual Basic, Visual C++, LabVIEW, LabWindows/CVI, and other development platforms.

– Technical Specifications

Serial Interface
• RS485 and RS422 protocols
• 4 isolated ports with 10-position I/O modular connectors
• Adapter cables available for DB-9 and DB-25 male connectors
• Port-to-Port and Port-to-PC isolation

Performance
• Maximum baud rate: 2000 kbaud (two-wire auto control mode)
• All baud rates from 2 bits/s to maximum supported by UART
• High-speed DMA transfers
• Multiprocessor and multithreading support

Power Requirements
• Typical: 950 mA at +5 VDC
• Maximum: 2 A at +5 VDC

Physical
• Dimensions: 6.3 × 3.9 inches
• Weight: 147 g

Environmental
• Operating temperature: 0 to 55 °C
• Storage temperature: –40 to 70 °C
• Operating humidity: 10% to 90% RH, noncondensing
• Storage humidity: 5% to 95% RH, noncondensing
• Operating vibration: 0.3 grms (5–500 Hz)
• Non-operating vibration: 2.4 grms (5–500 Hz)
• Shock rating: 30 g peak, half-sin, 11 ms pulse
• Pollution Degree 2; indoor use only

– Key Features

• Dual-mode transceiver operation—half- and full-duplex configurations
• Transparent COM port integration—plug-and-play on Windows systems
• Isolated design mitigates ground loop issues in multi-node networks
• DMA-driven transfers reduce CPU overhead

– Typical Applications

• Industrial equipment communication and diagnostics
• Multi-node sensor networks requiring electrical isolation
• PXI-based automated test systems with serial device control

– Compatibility & Integration

The module appears as standard COM ports under Windows 2000/NT/XP/Me/9x. Full support for NI-VISA enables integration with LabVIEW, Measurement Studio, and Lookout environments.