介绍了串口编程技术，RS485总线驱动模式和RS485串口驱动程序。 然后在此基础上设计和实现了SDM300远程控制模块和异步信道的通信模块。
Findally, we implement SDM300 remote control module and Async communication module on the basis of introducing technology of serial programming , RS485 bus driving mode and RS485 serial driver.
在工矿自动化远程控制通信中，一部分通信结构采用的RS485总线方式。
During the remote automatic control communication, the partial communication structure USES RS485 bus.
PLC和远程I/O模块之间的控制和通信通过CAN总线来实现，其通信距离可以达到几百米。
The controlling and communication between the PLC and the remote I/O modules are used by the CAN bus, the distance can be several hundred meters.
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