如何获得用于RS-485通信的Modbus协议 [英] How to get Modbus Protocol for RS-485 Communication

问题描述

Hai All，

现在我正在努力使用MODBUS通信协议进行Rs-485通信。我应该如何通过RS-485通信我的设备。现在我没有从这些串口通信中获得任何数据。

任何人都可以向我解释如何使用RS-485通信设备。



感谢ADV，

Hai All,
Now i am struggling with MODBUS communication protocol for Rs-485 Communication. And how should i communicate my Device via RS-485. Now i didn't get any data from these serialport communication.
Can any one explain me how to communicate devices with RS-485 .

Thanks in ADV,

推荐答案

WIN32 C++ code RS485 modbus 4 way relay module. Best compiled with MS Visual studio.
Open source project will allow you to customize according to your requirements. No closed source limitations.

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rs485modbus下载| SourceForge.net [ ^ ]

据我所知，使用RS-485可以使用与RS-232完全相同的类： System.IO.Ports.SerialPort ，请参阅：

http：// msdn.microsoft.com/en-us/library/system.io.ports.serialport.aspx [ ^ ]。



请参阅：

http://en.wikipedia.org/wiki/Rs-232 [ ^ ]，

http://en.wikipedia.org/wiki/RS-485 [ ^ ]。



通过串口工作的Modbus协议是很平常的事情，即使它的串行变体已经过时（希望如此）。最有可能的是，您将使用协议的Modbus RTU或Modbus ASCII版本。请参阅：

http://en.wikipedia.org/wiki/Modbus [< a href =http://en.wikipedia.org/wiki/Modbustarget =_ blanktitle =New Window> ^ ]，

http://www.modbus.org/ [ ^ ]。

-SA

To best of my knowledge, to work with RS-485, you can use exact same class you would use with RS-232: System.IO.Ports.SerialPort, please see:
http://msdn.microsoft.com/en-us/library/system.io.ports.serialport.aspx[^].

Please see:
http://en.wikipedia.org/wiki/Rs-232[^],
http://en.wikipedia.org/wiki/RS-485[^].

Modbus protocol working through a serial port is a very usual thing, even though the serial variants of it are getting obsolete (hopefully). Most likely, you will use Modbus RTU or Modbus ASCII versions of the protocol. Please see:
http://en.wikipedia.org/wiki/Modbus[^],
http://www.modbus.org/[^].

—SA

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