当总线空闲下来时，它可以重新填充额外的缓冲区。
另外，这有助于缓解总线冲突问题——当总线繁忙时，程序可以处理额外的缓冲区，而不是等待总线空闲下来。
Also, this helps smooth out bus contention issues — when the bus is full, the program can process the extra buffers rather than wait for the bus to free up.
文件的现场总线技术文件和配置文件下载区。
File download area for Fieldbus technical documentation and configuration files.
安装在每一个货位的电子标签通过RS485总线进行联网，通过货区控制器进行管理和控制。
The electronic label which is installed in each goods-position is connected to the RS485 bus, and a goods-zone controller manage and control every electronic label of the zone.
安装在每一个货位的电子标签通过RS485总线进行联网，通过货区控制器进行管理和控制。
The electronic label which is installed in each goods-position is connected to the RS485 bus, and a goods-zone controller manage and control every electronic label of the zone.
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