Reaserch On Communication Mode In Security Area

With the rapid development of security and protection system (SPS), it had been used in numbers of the different field, such as, scientific research, finance, culture museum, public and residence. Meanwhile, the number of the SPS project and the investment increased dynamically. However, the results fall short of expectations. Numbers of accidents happened because the signal was blocked or delayed in transmission. Therefore, it is vital to choose a network of security and protection that can handle the data between mainframe and terminal effectively.Based on the requirement of cost and expansible communication and combine the status quo of SPSand its characteristics, which with a consideration of fieldbus and network, a more suitable communicate model was brought forward in transmission.This paper divides the structure into two parts: upper communicate network and under-layer. Under-layer employs the fieldbus, that is, the combination of RS485 and MODBUS. In addition, by using VC++6.0 in the project and testing the communicate simulation, achieve IP (UDP) multicast in the upper network.