As an electric vehicle charging pile (bolt) on the power distribution side of the power grid, its structure determines that the automated communication system is characterized by many and scattered points, wide coverage, and short communication distance. And with the development of the city, the network topology requires a flexible and expandable structure. Therefore, the selection of the communication method of the electric vehicle charging pile (bolt) should consider the following issues:

(1) Reliability of communication-The communication system has to withstand the test of harsh environment and strong electromagnetic interference or noise interference for a long time, and keep the communication unblocked.

(2) Construction costs-on the premise of satisfying reliability, comprehensive consideration of construction costs and long-term use and maintenance costs.

(3) Two-way communication-not only can upload the amount of information, but also realize the release of the control amount.

(4) Multi-service data transmission rate-With the continuous growth of terminal business volume in the future, the communication between the master station to the sub-station and the sub-station to the terminal requires higher and higher data transmission rates for the realization of multiple services.

(5) The flexibility and scalability of communication-because the charging pile (bolt) has the characteristics of multiple, wide and scattered control points, it requires the use of standard communication protocols. With the development of the "ALL IP" network technology trend As well as the continuous growth of power operation business, it is necessary to consider IP-based business bearer, and at the same time require easy installation, construction, commissioning, operation, and maintenance.