Port & Physical Interface Configuration

• Two hardware variants: PXI-8423/2 (2-port DB-9 male) / PXI-8423/4 (4-port 10P10C modular jack)
• Front panel integrated signal activity LED indicators for each serial channel
• Standard single-width 3U PXI form factor, occupies only one independent PXI peripheral slot
• Dimension: 100 × 160 mm, compatible with all standard 3U PXI chassis
• Accessory matching: 10P10C to DB-9 breakout cable required for 4-port variant field wiring

Serial Communication Core Parameters

• Supported protocols: Half-duplex/full-duplex RS-485, full-duplex RS-422
• Max baud rate: 460.8 kbps, compatible with all standard industrial baud rate gears
• Hardware buffer: 64-byte independent transmit/receive FIFO per channel
• Max cable length: 1.2 km under low EMI environment; limited to 30 m for EMC surge compliance
• Node capacity: Up to 31 slave nodes on a single RS-485 bus segment

Galvanic Isolation & Protection Ratings

• Port-to-host isolation withstand: 2000 Vrms for 5 seconds dielectric test
• Port-to-port isolation withstand: 2000 Vrms for 5 seconds dielectric test
• Continuous operating isolation voltage: 60 VDC CAT I safety rating
• ESD protection: ±15 kV human body model for all differential data lines
• Common-mode voltage tolerance: -7 V to +12 V for RS-485 signal lines

PXI Backplane Power Specifications

• PXI-8423/2 power draw: 800 mA typical, 1.3 A maximum @ +5 V backplane rail
• No additional power consumption on ±12 V and +3.3 V PXI rails
• Bus bandwidth: 132 MB/s standard PXI parallel bus throughput
• Bus trigger support: No PXI trigger bus synchronization function

Environmental & Reliability Specifications

• Operating temperature: 0℃ ~ +55℃ (laboratory and indoor industrial use only)
• Storage temperature: -20℃ ~ +70℃
• Humidity: 10%–90% non-condensing operation; 5%–95% non-condensing storage
• Max working altitude: 2000 m, Pollution Degree 2 indoor rating
• Compliance: CE, FCC Class A, UL 61010-1, IEC 61010-1 safety & EMC certification

Compatibility Matching List

• Compatible PXI chassis: All legacy 3U PXI chassis including PXI-1000B, PXI-1042, PXI-1045
• Compatible controllers: PXI-8186, all NI embedded and external PC PXI controllers
• Supported OS: Windows XP/7/10, Phar Lap ETS real-time system
• Official status: Fully obsolete, only aftermarket replacement inventory available

Software Compatibility

• Drivers: NI-Serial legacy drivers, NI-VISA, NI-DAQmx all versions
• Configuration tools: NI MAX, NI Serial Configuration Utility
• Supported software: LabVIEW all versions, LabWindows/CVI, Python PyVISA, C# serial SDK

Pros & Limitations

• Pros: High isolation voltage for ground loop suppression, independent per-channel FIFO for low CPU load, dual interface variants for flexible wiring, robust ESD surge protection, wide OS compatibility
• Limitations: No built-in bus termination resistor, limited to indoor use only, obsolete hardware lifecycle, no isolated power output for external sensors