IEC 62056-42:2002规定了异步数据通信的能源计量配套规范（COSEM）三层面向连接配置文件中的物理层服务和协议。在附录A中，给出了如何使用智能Hayes调制解调器通过公共交换电话网（PSTN）将该物理层用于数据交换的示例。附录B解释了数据模型和协议在电表数据交换中的作用。该双语版本（2013-05）对应于2002年出版的单语英语版本- 02.

IEC 62056-42:2002 specifies the physical layer services and protocols within the Companion Specification for Energy Metering (COSEM) three-layer connection oriented profile for asynchronous data communication. In annex A, an example of how this physical layer can be used for data exchange through the Public Switched Telephone Network (PSTN) using intelligent Hayes modems is given. Annex B gives an explanation of the role of data models and protocols in electricity meter data exchange. This bilingual version (2013-05) corresponds to the monolingual English version, published in 2002-02.