The National Instruments PXI-8422/4 is a four-port isolated RS-232 interface for PXI systems.
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Key product information and technical features.
This module adds four isolated serial ports to a PXI system. NI identifies part number 777736-04 as the PXI-8422/4.
Its modular port connectors require conversion cables for DB-9 or DB-25 connections. Check the legacy software environment before integration: NI-Serial 17.0 removed support for the PXI-8422 family.
Verified product specifications.
| Serial ports | 4 ports |
|---|---|
| Maximum baud rate | 115.2 kbps |
| I/O connector | 10-position modular jack (10P10C) |
| Dimensions | 100 × 160 mm |
| Supply voltage | +5 VDC |
| Supply current | 500 typical; 750 maximum mA |
| Continuous isolation, port-to-port and port-to-host | 60 VDC, CAT I |
| Isolation withstand, port-to-port and port-to-host | 2000 Vrms, verified by a 5-second dielectric withstand test |
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Isolated RS-232 interface
Conversion cables required for DB-9 or DB-25 connections.
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Product-specific answers based on available technical information.
It is the four-port isolated RS-232 model. The PXI-8422/2 is the separate two-port variant.
No. The four-port board uses 10-position modular jacks and requires conversion cables for DB-9 or DB-25 connections.
No. It is a 2000 Vrms, five-second dielectric withstand rating. Continuous isolation is 60 VDC, CAT I.
No. NI explicitly removed PXI-8422 support in NI-Serial 17.0. Verify an earlier driver and operating-system combination before use.