In the credit card processing module and LED displaying module, 51 Single-chip system is used as minimum microcontroller system which communicates with the master module through the serial port.
在刷卡处理模块和LED显示模块中，采用51单片机为核心的最小单片机系统，通过串口与主控模块通信。
With the RS232 serial port, the different kinds master slave system of AC converters can communicate with PC under the USS protocol.
多类型变频器通过RS2 32串行口通讯，在USS通讯协议下，就可以与工控机联网。
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