Siemens 6ES7241-1AH32-0XB0 is the CM1241 RS232 communication module for the SIMATIC S7-1200 family, delivering a serial Modbus RTU interface via a 9-pin D-sub connector. It enables the S7-1200 to communicate with Modbus RTU devices, supporting Modbus slave addresses 1–247 with a per-segment limit of 32 devices. This RS232 variant is part of the CM1241 family, which also includes RS422/RS485 configurations for other serial network needs.
