将RS485设备连接到Modbus RTU中的计算机

时间:2016-11-05 11:52:39

标签: modbus rs485

如何将电压监测仪表与RS485输出连接到带Modbus RTU的电脑?我应该使用转换器RS232并连接到计算机的串行COM端口吗?我应该使用RS485到USB转换器连接吗?我可以使用D9连接器针脚从RS485的A,B和接地直接连接到串行COM端口吗?那么A,B和接地是Modbus RTU中D9的引脚? ND20 pinout RS485 Details

3 个答案:

答案 0 :(得分:0)

  • 是的,您应该使用RS485转USB转换器将ND20连接到您的计算机。

  • 至少需要将ND20的A(有时称为“ - ”)和B(或“+”)线连接到RS485 / USB适配器的相同线路。检查您的RS485 / USB适配器手册的引出线。请记住,“A”行也可以称为“ - ”,“B”可以称为“+”。请参阅此处more RS485 application info

  • 建议连接GND,但在大多数情况下,它应该没有。

  • 您需要知道ND20使用的波特率/每秒位数(9600?19200?)。您需要在PC应用程序中进行设置。

  • 完成所有连接并准备好操作后,您需要使用访问RS485转换器的PC应用程序(Window上的“COM”设备,例如“COM6”)。 PC应用程序需要根据MODBUS RTU协议规范请求测量值并接收结果。我们的免费Docklight evaluation can help with MODBUS,但最方便的解决方案是一个小型的MODBUS主工具,就像这个名为QModMaster的新免费软件。

答案 1 :(得分:0)

选项1:PC-> USB到RS232-> RS232到RS485-> RS485设备

选项2:PC-> USB至RS485-> RS485设备

选项3:PC-> RS232到RS485-> RS485设备

您需要USB到rs485 / rs232到rs485转换器

由于rs485处于悬空状态,您可能需要接地以实现可靠的通信

答案 2 :(得分:-1)

您可以使用USB-RS485转换器进行连接。不知道其他方法,但是对我有用。 有关如何从头到尾进行交流的详细信息,请观看以下视频: https://www.youtube.com/watch?v=X3RW-0e_PSI

该程序在Windows和raspbian上都有效,唯一的区别是两者的端口名...

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        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">84</td>
          <td class="ng-binding">168</td>
          <td class="ng-binding">252</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">85</td>
          <td class="ng-binding">170</td>
          <td class="ng-binding">255</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">86</td>
          <td class="ng-binding">172</td>
          <td class="ng-binding">258</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">87</td>
          <td class="ng-binding">174</td>
          <td class="ng-binding">261</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">88</td>
          <td class="ng-binding">176</td>
          <td class="ng-binding">264</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">89</td>
          <td class="ng-binding">178</td>
          <td class="ng-binding">267</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">90</td>
          <td class="ng-binding">180</td>
          <td class="ng-binding">270</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">91</td>
          <td class="ng-binding">182</td>
          <td class="ng-binding">273</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">92</td>
          <td class="ng-binding">184</td>
          <td class="ng-binding">276</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">93</td>
          <td class="ng-binding">186</td>
          <td class="ng-binding">279</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">94</td>
          <td class="ng-binding">188</td>
          <td class="ng-binding">282</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">95</td>
          <td class="ng-binding">190</td>
          <td class="ng-binding">285</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">96</td>
          <td class="ng-binding">192</td>
          <td class="ng-binding">288</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">97</td>
          <td class="ng-binding">194</td>
          <td class="ng-binding">291</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">98</td>
          <td class="ng-binding">196</td>
          <td class="ng-binding">294</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
        <tr ng-repeat="row in rowList" class="ng-scope">
          <td class="ng-binding">99</td>
          <td class="ng-binding">198</td>
          <td class="ng-binding">297</td>
        </tr>
        <!-- end ngRepeat: row in rowList -->
      </tbody>
    </table>
  </div>
  <div class="centerTable">
    Center table<br>fixed height/width
  </div>
  <div class="rightTable">
    Right Table<br>fixed height/width
  </div>
</div>