National Instruments Corporation 780592-01 NI PCIe-8431/8, 8 Port, RS485/RS422 Serial Interface

The NI PCIe-8430/16 is a high-performance, 8-port asynchronous serial interface for high-speed communication with RS232 devices at rates of up to 1 Mbit/s. NI high-performance RS232 interfaces are available with up to 16 ports. The NI PCIe-8430/16 offers flexible baud rates for data transmissions between 2 baud and 1,000,000 baud with better than 0.015 percent accuracy for standard baud rates and 0.5 percent accuracy for nonstandard baud rates.

NI 843x serial interfaces feature high-performance DMA transfers, multithreading, and multiprocessor support. Unlike traditional interrupt-based serial interfaces, you can use multiple NI serial interfaces to communicate with dozens of ports at high rates effortlessly in a single system with minimal CPU usage. The included NI-VISA API simplifies serial programming in NI LabVIEW and other languages and keeps your code portable between all VISA-compatible interfaces. NI serial interfaces also show up as standard COM ports for compatibility with programs that use serial communications.