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From 11:00 PM CDT Friday, Nov 8 - 2:30 PM CDT Saturday, Nov 9, ni.com will undergo system upgrades that may result in temporary service interruption.
We appreciate your patience as we improve our online experience.
4-Port, PCI, RS485/RS422 Serial Interface Device—The PCI‑8431/4 is a high-performance interface for high-speed communication with RS485 and RS422 devices. It features high-performance DMA transfers, multithreading, and multiprocessor support. You can also select between 4‑ and 2‑wire transceiver modes for full‑ and half‑duplex communication. NI serial interfaces also appear as standard COM ports for compatibility with programs that use serial communications.