Siemens Communication module, D-sub socket, 9-poleProduct Overview The SIMATIC S7 1200 Communication Module CM 1241 expands controller communication capabilities with RS422 485 serial interface and 9 pole D sub socket connector. Supports Freeport protocol for flexible industrial device integration and data exchange applications. Key Features RS422 485 Communication: Dual protocol support for point to point and multi drop networks Freeport Protocol: Message based communication with user defined