R13-249B-01-BY is a Schneider Electric SCI interface module, designed to provide an interface between automation systems and a variety of sensors and actuators. It contains both digital and analog I/O channels and supports a variety of communication protocols, including Modbus RTU, BACnet, Modbus TCP/IP, and Siemens S7. It can be used to connect building automation systems to common types of HVAC, lighting, and other control systems, as well as providing control and monitoring of systems such as elevator control, access control, and fire safety systems.