PCIe to 2 x DB9 Serial Port Expansion Card Adds two standard RS232 DB9 serial ports to a PCIe host, enabling connection to legacy devices with ease and reliability. speed transmission with stable and accurate data transfer for critical serial communication tasks. Broad compatibility across a variety of operating systems and software environments, supporting diverse deployment scenarios. Simple PCIe installation with two serial lines, providing convenient and straightforward expansion for serial I/O needs. Two DB9 serial port interfaces wired for straightforward connections to two devices, maximizing data capture and control capabilities. Applications and use scenarios Industrial control and automation: connect PLCs, CNC machines, barcode scanners, and other RS232 devices to a modern PC or server for realtime control and data acquisition. Data collection and laboratory testing: link measurement instruments, multimeters, oscilloscopes, and other RS232 compatible equipment to central analysis software. Legacy equipment modernization and maintenance: enable ongoing operation of older serial devices by providing reliable PCIebased RS232 connectivity on current systems.