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The 16850 UART cards have a 128-byte FIFO buffer for fewer CPU interrupts! The IC972C-R2 card features a low profile. Configure ports as RS-232 for standard serial COM ports or choose RS-422 for long-distance connections. RS-422/485 supports cable distances up to 4000 feet (1219.2 m). IC073C, IC074C-R2, and IC972C-R2 can be configured for RS-422/RS-530 applications. Opto-isolated cards thwart ground loops.