The National Instruments PCI-8433/2 is a robust serial interface device designed for seamless communication with RS485 and RS422 devices. This device features an integrated automatic biasing resistor, essential for maintaining a known state when the bus is idle, ensuring a differential voltage of at least 200 mV is achieved. Users have the flexibility to use custom resistors if needed, although it is important to disable the built-in bias resistors when external options are employed. The RS-485 interface supports four modes of hardware handshaking control, allowing users to activate and deactivate transmitters and receivers to accommodate varying bus topologies. In contrast, the RS-422 interface employs balanced transmission lines, utilizing two lines per signal for enhanced performance. The PCI-8433/2 is equipped with two ports and has a maximum baud rate of 3 Mbps, making it suitable for high-speed applications. It operates at a power requirement of +5 VDC and includes a FIFO size of 128 bytes. The device's compact dimensions of 4.2 in. by 6.9 in. and lightweight design (0.23 lb.) enhance its adaptability for industrial setups. The PCI-8433/2 is compatible with NI-Serial software drivers, and though it has reached mature status, it remains available for purchase and repair through Apex Waves. Users can access the user and maintenance manuals for comprehensive guidance on operation and maintenance. For pricing information, please contact a sales representative.