The National Instruments PXI-8421/2 is a two-port, nonisolated RS-485/RS-422 serial interface for PXI systems, with male DB-9 connections and 64-byte FIFOs.
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Key product information and technical features.
The PXI-8421/2 adds serial communication to a PXI system. NI documents 16550-compatible UARTs, standard PC COM-port compatibility and FIFO buffering to reduce susceptibility to interrupt latency for this hardware family.
Software selection is important when integrating this legacy module: NI-Serial 17.0 removed support for the PXI-8421 family. Check the selected legacy driver against the intended operating system before deployment.
Verified product specifications.
| Port count | 2 ports |
|---|---|
| Serial standards | RS-485/RS-422 |
| Isolation | No |
| I/O connector | DB-9 male |
| FIFO size | 64 bytes |
| Board dimensions | 100 × 160 mm |
| Typical current from +5 VDC PXI supply | 350 mA |
| Maximum current from +5 VDC PXI supply | 750 mA |
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Manufacturer
Hardware platform
Serial interface module
NI-Serial 17.0 removed PXI-8421 support.
Manuals, software and technical resources for this model.
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Product-specific answers based on available technical information.
NI specifies RS-485/RS-422 for this model, not RS-232.
No. NI lists this model as nonisolated.
No. NI explicitly removed PXI-8421 support in NI-Serial 17.0. Verify an appropriate earlier driver and its operating-system requirements.