Available. The Mitsubishi QJ71C24N is a versatile communication module designed for the MELSEC-Q Series programmable logic controllers (PLCs). It facilitates seamless serial communication between the PLC and external devices, such as computers, barcode readers, and other industrial equipment. This module features two independent serial channels: one RS-232 and one RS-422/RS-485, enabling flexible connectivity options. The QJ71C24N supports various communication protocols, including MC Protocol, predefined protocol communication, nonprocedural protocol communication, and bidirectional protocol communication, ensuring compatibility with a wide range of devices. It offers transmission speeds up to 230,400 bps, with a maximum transmission distance of 1,200 meters, depending on the interface and communication method. The module is housed in a compact enclosure measuring 98 mm in height, 27.4 mm in width, and 90 mm in depth, with a weight of 0.20 kg, making it suitable for installations with space constraints. The QJ71C24N is an essential component for expanding the communication capabilities of MELSEC-Q Series PLCs, providing reliable and efficient data exchange in industrial automation applications.