IEC 62055-52:2008（E）规定了STS的物理层协议，用于在客户端（通常为HHU）和服务器（符合STS的电费表）之间传输信用单位和其他管理信息，通常通过直接本地连接。它是对IEC 62055-41中规定的应用层协议的补充，应与该标准结合使用。它旨在跨不同制造商开发的一系列支付仪表使用，并确保这些产品与其他客户设备之间的兼容性。它指定了客户机/服务器通信协议。

IEC 62055-52:2008(E) specifies a physical layer protocol of the STS for transferring units of credit and other management information between a client (typically a HHU) and a server (an STS-compliant electricity payment meter), typically over a direct local connection. It is complementary to the application layer protocol specified in IEC 62055-41 and should be used in conjunction with that standard. It is intended for use across a range of payment meters developed by different manufacturers and to ensure compatibility between these products and other client devices. It specifies a client/server communications protocol.