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Method and apparatus for communication from message application layer (MODBUS) to transport layer (TCP) over Ethernet (registered trademark)
Method and apparatus for communication from message application layer (MODBUS) to transport layer (TCP) over Ethernet (registered trademark)
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机译:通过以太网(注册商标)从消息应用层(MODBUS)到传输层(TCP)的通信的方法和装置
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摘要
A communications adapter is provided for interfacing between a master device and an I/O device (body) having an output and/or an input. In the case of the I/O body having an output, the adapter has a TCP port for coupling to the master device via a transmission path for receiving a request message. The adapter also has a connector for operable coupling to the I/O device for receiving the output of the I/O device. The adapter further has an interface circuit operably connected to the TCP port and the connector for transmitting a response message over the transmission path in response to the request message, the response message correlating to the output received from the I/O device. The request message and the response message is limited to a length that is less than a TCP transaction length and/or a maximum transmission unit limit, or both, depending on the embodiment of the present invention.
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