According to characteristics of refrigerated truck of agricultural products

coordinator node and sensor nodes are designed based on Z-StackTM protocol stack and compose Zig Bee star network

which is responsible for collection and transmission of environmental information of refrigerated truck.Through GPRS network and Internet

remote data monitoring center receives data packets of temperature and humidity which are sent over by coordinator nodes

to realize real-time monitoring of refrigerated truck environment and achieve dynamic display of temperature and humidity information

real-time alarming

historical reporting

data storage and other functions.The loss rates of remote monitoring system receiving data packets are tested

respectively

in the case of full-load（tomatos）and no-load under the conditions of ambient temperature is 10 ℃ and relative humidity is 85 %RH in the refrigerated compartment.The results show that the system is stable

reliable and suitable for the needs of remote monitoring for the refrigerated truck environment of agricultural product.