A sign of each line for the car is mounted to reset error of the coder.
每台机车移动线上设置一固定标志位，用于对位移编码器累计误差的清零。
This is not the same as a broken connection which would cause a connection reset error.
这与导致连接复位的错误所致的断开的连接不同。
In addition, when it is used, the error index must be reset to -1 before each parse operation; otherwise the result can be misleading.
另外，使用它时，在每次解析操作前必须将错误索引重置为- 1；否则结果将可能产生误导。
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