The National Instruments PXI-8420/2 adds two non-isolated RS-232 serial ports to a PXI system. It provides DB-9 male connections and supports rates up to 115.2 kbit/s.
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Key product information and technical features.
The PXI-8420/2 is the two-port member of NI's PXI-8420 RS-232 interface family. Its two-port format uses DB-9 connectors rather than the breakout connections used by higher-port-count variants.
The hardware uses 16550-compatible UARTs for standard PC COM-port compatibility. FIFO buffering reduces sensitivity to interrupt latency, while Plug and Play enables switchless configuration. Software selection requires care: NI-Serial 17.0 removed support for the PXI-8420 family.
Verified product specifications.
| Platform | PXI |
|---|---|
| Serial standard | RS-232 |
| Serial ports | 2 ports |
| Maximum serial rate | 115.2 kbit/s |
| Connector type | DB-9 male |
| Isolation | Non-isolated |
| FIFO size | 64 bytes |
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Hardware platform
Two-port RS-232 interface
NI-Serial 17.0 removed PXI-8420 support.
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Product-specific answers based on available technical information.
No. This model is an RS-232 interface. NI identifies the PXI-8421 family as the RS-485/RS-422 counterpart.
No. NI lists the PXI-8420/2 as non-isolated.
NI-Serial 17.0 removed support for the PXI-8420 family. Confirm an earlier driver's explicit hardware and operating-system support before configuring the system.