Available. The Mitsubishi QJ71C24N-R2 is a serial communication module designed for the MELSEC-Q series programmable controllers. It features two RS-232 channels, each capable of operating at transmission speeds up to 115,200 bps, with a combined maximum of 230,400 bps. The module supports various communication protocols, including MC protocol, predefined protocol, non-procedural protocol, and bidirectional protocol communication. It offers error detection through parity checks and sum check codes, ensuring reliable data transmission. The module is equipped with transmission control features such as DTR/DSR control, RS/CS control, CD (DCD) signal control, and DC1/DC3 (Xon/Xoff) control. It has a maximum transmission distance of 15 meters for RS-232 connections. The module's dimensions are 98 mm in height, 27.4 mm in width, and 90 mm in depth, with a weight of 0.20 kg. It is compatible with the MELSEC-Q series and is suitable for applications requiring reliable serial communication in industrial automation systems.