NI PXI-8433/2 RS485/RS422 High-Performance, Isolated 2-Port Serial Interface

The NI PXI-8433/2 is a 2-port serial interface module for PXI systems that delivers high-performance RS485 and RS422 communication in electrically isolated configurations. The module provides dual DB-9 male connectors supporting both 2-wire half-duplex and 4-wire full-duplex transceiver modes, appearing as standard COM ports for direct compatibility with existing serial software. Electrical isolation between ports and between ports and the PC—rated to 60 VDC (CAT I) with optical isolation to 2,000 V—eliminates ground loop issues and protects against voltage transients in industrial environments.

– Technical Specifications

• Serial Protocols: RS485, RS422
• Maximum Baud Rate: 3 Mbps (supports 2 baud to 3 Mbps)
• Transceiver Modes: 2-wire (half-duplex) and 4-wire (full-duplex), selectable
• FIFO Buffer: 128 Bytes
• Data Transfer: DMA transfers supported with multithreading and multiprocessor capability
• Operating Rated Voltage (RS-485): -7 V to +12 V
• Port-to-Host Isolation: 60 VDC (CAT I)
• Optical Isolation: Up to 2,000 V
• Power Consumption: 725 mA typical, 1 A maximum at +5 VDC
• Connectors: 2× DB-9 male
• Dimensions: 6.37 × 3.94 inches
• Weight: 125 g
• Environmental: Operating shock 30 g peak (half-sine, 11 ms); Operating vibration 5–500 Hz at 0.3 grms

– Key Features

• Dual-port isolation protects against ground loops and transient voltages
• Selectable half-duplex and full-duplex operation for flexible deployment
• Appears as standard COM ports—no custom driver development required
• DMA and multithreading support for high-throughput applications
• Complies with IEC 61010-1, EN 61010-1, UL 61010-1, and CSA 61010-1

– Compatibility & Integration

Works with NI-Serial driver software and integrates with LabVIEW and LabWindows/CVI. Supports real-time OS and Windows operating systems.