电能表预付费系统-标准传输规范(STS)（15）

6.3.7 CRC: CyclicRedundancyCheck (循环冗余校验)

The CRC is a checksum field used to verify the integrity of the data transferred for all tokens, except for Class 0 with SubClass 4 to 7, which uses CRC_C (see 6.3.22). The checksum is derived using the following CRC generator polynomial:

        CRC是一个校验和字段，用于验证所有令牌传输数据的完整性，除了子类4到7的类0，它使用CRC_C（见6.3.22）。校验和是使用以下CRC生成器多项式导出的：

The total length of the data transferred via the token is 66 bits. The last 1 6 bits comprise the CRC checksum that is derived from the preceding 50 bits. These 50 bits are left padded with 6 binary zeros to make 56 bits. Before calculation, the CRC checksum is initialised to FFFF hex (see example in Table 26).

        通过令牌传输的数据的总长度为66位。最后的16位包含从前面的50位派生出来的CRC校验和。这50位被剩下的6个二进制零填充成56位。在计算之前，CRC校验和被初始化为FFFF十六进制（见表26中的示例）。 

 6.3.8 Control: InitiateMeterTest/DisplayControlField(启动仪表测试/显示控制域)

The initiate payment meter test data field is 36/28 bits long and is used to indicate the type of test to be performed. The particular test is selected by setting the relevant bit to a logic ONE. The permissible field values are defined in Table 27. 

        初始付费仪表测试数据字段长36/28位，用于指示要执行的测试类型。通过将相关位设置为逻辑位来选择特定的测试。允许的字段值定义在表27中。

NOTE In the context of electricity metering the term "usage" refers to either active energy, reactive energy or apparent energy cumulative totals, depending on the specific metering application. In the context of water, gas or time, the meaning may be interpreted in the context of the particular metering application.

        注：在电能计量的上下文中，术语“使用量”是指有功能、无功能或视能累计总量，这取决于具体的计量应用。在水、气或时间的上下文中，其含义可以在特定计量应用的上下文中解释。

All payment meters shall support test number 0; if any of the incorporated tests are not supported the payment meter shall perform the subset of tests that are supported. The optional selection of additional incorporated tests is subject to the supply agreement between the supplier and the utility and shall then form a normative part of this document. 

        所有付费仪表应支持测试号0；如果不支持任何合并的测试，则支付仪表应执行支持的测试子集。附加综合试验的可选选择取决于供应商和公用事业公司之间的供应协议，并应构成本文件的规范性部分。 

In the case where a test is optional, the inclusion of this test shall be subject to the supply agreement between the supplier and the utility and shall then form a normative part of this document. 

        如果测试是可选的，则应根据供应商和公用事业公司之间的供应协议，将该测试纳入其中，并应成为本文件的规范性部分。 

In the case where more than one test is specified on a single token, the behaviour of the payment meter shall be agreed between the utility and the supplier and shall then form a normative part of this document.

        如果在单个令牌上指定了多个测试，则付费仪表的行为应由公用事业公司和供应商商定，并应构成本文件的规范性部分。