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NI PCI-232/4 Four-Port Serial Interface

COMMTECH Fastcom ESCC-cPCI-335-03 High Speed RS-422 RS-485 Sync Serial Adapter

NI PCI-485/4 4-Channel Serial Interface

BMCM MDA16-4i D/A Converter Module for PCI-BASEII, PCIe-BASE #S-70

NI PCI-8433/2 High-Performance, Isolated 2-Port Serial Interface (RS485/RS422)

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NI PCI-8432/4 High Performance, Isolated 4-Port Serial Interface (RS-232)