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This SIADA15069 M.2 B+M Key serial controller card adds 2port standard RS232 DB9 interfaces to your PC via an M.2 slot. Built with highperformance serial controller chip, it ensures stable and fast data transmission for industrial automation, PLC debugging, POS equipment and monitoring systems. Compact M.2 design saves internal space, supporting mainstream operating systems for easy deployment in embedded PCs and smallsize workstations.