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Dual RS232 Serial Connectivity: Connect two RS232 serial devices to one USB host system with two independent DB9 interfaces (1 male and 1 female). Designed for PLC controllers, CNC equipment, POS terminals, industrial machines, serial instruments and other RS232-based applications Independent Dual Serial Communication: Each RS232 channel works independently, allowing two serial devices to communicate at the same time through a single USB connection. Suitable for PLC programming, automation control, CNC operation, equipment testing and serial data monitoring Integrated USB 2.0 Hub Expansion: Equipped with two additional USB 2.0 ports for connecting keyboards, mice, barcode scanners, USB storage devices, wireless dongles and other peripherals. Combines RS232 communication and USB expansion in one compact industrial adapter Dedicated TX/RX/Power Indicator LEDs: Each serial port includes separate transmit, receive and power status indicators, providing real-time visibility of communication activity. Helps simplify installation, diagnostics, troubleshooting and equipment maintenance Durable Metal Housing with USB Type-B Connection: Built with a rugged metal enclosure to support professional environments and improve EMI resistance. The USB Type-B host interface provides a stable connection to computers and control systems. Compatible with Windows, Linux and macOS platforms