预付费计量系统实体模型
1. 预付费计量系统实体模型
A generic entity model for electricity payment metering systems is shown in Figure 2.
Although it provides a limited perspective, it does serve to convey certain essential concepts.
关于电子式预付费电表系统的实体模型见图 2。虽然有些局限，但是它传递了基本的概念。
2.1. 预付费计量系统实体模型的元素
The essential entities of a payment metering system are:
- the Payment_Meter ;
- the Token_Carrier or Remote_Communication_Services providing the means to communicate with the Payment_Meter;
- the Meter_Operation providing the means to install a payment meter and to configure its variable;
- parameters;
- the Point_Of_Sale where a customer interfaces with the supplier to conduct transactions;
- the Customer_Information_System;
- the System_Interfaces where the va