intelligent transportation systems (ITS) proposed a new demand that the VMS should have the ability to choose the most simple and effective means of communication according to the different environments as well as higher demands in the stability and reliability of the communication. In view of this situation
combined with the embedded technology and network communication technology
this paper proposed a communication system based on embedded highway VMS. The system uses MC703CDMA EV-DO 3G module and DM9000CIEP network chip
combined with the powerful networking capabilities of Linux operating system
has the ability of 3G wireless network
10/100M adaptive Ethernet communication and RS485 serial interface communication. The system has high effectiveness and stability in communication
at the same time it can selected different communication methods according to the specific environment.