Advantech USO9ML2DR-2 Programmable Logic Controller Module

Advantech USO9ML2DR-2 is a two-port USB-to-RS-232 isolated serial adapter module that lets a PC or PLC communicate with RS-232 devices over USB. It uses two DB9 male (DTE) RS-232 ports and a USB Type-B female connector, and is built around an FT232RL USB-to-serial controller for reliable USB connectivity. The unit provides port-to-port isolation up to 2000 V with optical isolation and 15 kV ESD protection, making it suitable for demanding industrial environments. USB supports 1.1/2.0 with data rates up to 12 Mbps, while RS-232 channels operate up to 460.8 kbps to handle typical automation and data-logging tasks. Power can be drawn from the USB bus or an external 10–30 V DC supply; power consumption is listed as about 3 W for the 2-port model and 5 W for the 4-port variant. Dimensions are 16.4 cm x 3.0 cm x 8.0 cm (without flanges) and 19.0 cm x 3.0 cm x 8.0 cm (with flanges), with a weight around 0.73 lb for the 2-port and 0.77 lb for the 4-port version. Operating temperature ranges from 0 to 70 °C, storage from -40 to 85 °C, and humidity tolerance is 0–95% non-condensing. Regulatory approvals include FCC, CE, and UL. Driver support is available for Windows platforms (including 32- and 64-bit) across multiple generations, with separate 32/64-bit installers for 64-bit Windows as well as older 32-bit packages. Note: this product line is discontinued by many distributors, now listed as obsolete in several catalogs. Common uses include bridging USB-enabled hosts to legacy PLCs, data loggers, and other RS-232 devices in industrial automation. The USO9ML2DR-2 is also sold as BB-USO9ML2-2P, reflecting the same 2-port USB-to-serial functionality.