Yuanheng Liye has launched a powerful tool for software and hardware R&D personnel - Yuanheng Liye Communication Assistant. It supports serial port HEX/text transmission and reception, TCP/IP client and server functions, as well as Modbus RTU, ASCII, and TCP/IP client and server functions. It is free to use for life, and is welcome for download. Yuanheng Liye is committed to providing advanced fire alarm product testing equipment for China and the world. 

http://www.yuanhengliye.com/pro_x.php?id=30&pid=5