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MIC-3955 8port DB62 RS-232/422/485 FIO A 4-Port/8-Port RS-232/422/485 isolated. 32bit 33MHz PCI bus backplane. Speed up to 921600bps. UART 16C550 Compatible 5G Register Set. 2KV Surge protection. Support 5V only power input. Support Front Line out & Rear Line out. PICMG 2.0 Rev. 3.0 compatible.