To overcome some disadvantages of the current measurement and control system for the condition of storedgrain, a new  system with the same functions is constructed using two technologies—IEEE 802.15.4 (standard for Wireless Personal Network) and IEEE1451.5 (standard for Smart Transducer Interface for Sensors and Actuators). Concerning the wireless sensors network in the barn, the hardware designs for wireless sensor nodes and wireless sink nodes are given, and a network communication protocol suitable for data collection and transmission is also proposed. The practice shows that the new system based on those technologies has many notable advantages.