Keep mixed-device workflows moving with a purpose-built expansion module for the Durabook S14(G3). This accessory adds a second RS232 interface alongside a USB 3.2 Type A port, giving technicians, service teams, and industrial users direct access to both legacy serial equipment and current USB peripherals from the same system. For environments where connectivity matters more than convenience, integrated I/O is the cleaner choice. It reduces reliance on dongles, preserves port availability, and keeps the notebook ready for field diagnostics, device configuration, and data transfer tasks. The result is a more controlled setup for teams that still depend on serial communication while standardizing on modern USB accessories. Because this module is designed specifically for the S14(G3), it fits the platform’s expansion strategy rather than adding bulk through external adapters. That makes it a practical upgrade for users who need dependable port access in service, utility, manufacturing, and mobile maintenance roles.