The UART chip is the primary component used in serial communication. Although an independent 2- to 8-channel UART chip is usually sufficient, a UART integrated with PCI or PCI Express interface reduces the number of components onboard and translates into better MTBF, lower RMA, and lower power consumption, all of which go a long way in protecting your investment. Also make sure the UART of your MSB supports functions specific to industrial automation (IA), such as on-chip flow control, RS-485 ADDC, and linear baudrate. Without these UART functions, your serial transmission will be susceptible to poor reliability.
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