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<li class="toctree-l3"><a class="reference internal" href="#_1">说明</a>
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<li class="toctree-l3"><a class="reference internal" href="#modbus">步骤一：安装Modbus相关节点</a>
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<li class="toctree-l3"><a class="reference internal" href="#modbus-tcprtu">步骤二：添加Modbus TCP/RTU节点</a>
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<li class="toctree-l3"><a class="reference internal" href="#modbusmaster">步骤三：配置Modbus主设备（Master）</a>
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<li class="toctree-l3"><a class="reference internal" href="#_2">步骤四：配置读写操作</a>
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<li class="toctree-l4"><a class="reference internal" href="#modbus-read">Modbus-Read节点参数填写说明</a>
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<li class="toctree-l3"><a class="reference internal" href="#_3">步骤五：部署与调试</a>
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<li class="toctree-l3"><a class="reference internal" href="#_4">参考示例</a>
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<li class="toctree-l3"><a class="reference internal" href="#_5">常见问题</a>
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<h2 id="node-redmodbus-slave">node-red如何连接modbus slave设备<a class="headerlink" href="#node-redmodbus-slave" title="Permanent link">¶</a></h2>
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<h3 id="_1">说明<a class="headerlink" href="#_1" title="Permanent link">¶</a></h3>
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<p>我想在node-red中用流程图中配置modbus master主设备通过mocbus tcp rtu去联接modbus slave设备，如何配置呢？</p>
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<h3 id="modbus">步骤一：安装Modbus相关节点<a class="headerlink" href="#modbus" title="Permanent link">¶</a></h3>
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<ol>
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<li>打开Node-RED编辑器（浏览器访问 http://<你的设备IP>:1880）。</li>
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<li>点击右上角菜单，选择“Manage palette（管理调色板）”。</li>
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<li>在“Install”标签页中搜索 <code>node-red-contrib-modbus</code>，点击“Install”安装。</li>
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</ol>
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<h3 id="modbus-tcprtu">步骤二：添加Modbus TCP/RTU节点<a class="headerlink" href="#modbus-tcprtu" title="Permanent link">¶</a></h3>
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<ol>
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<li>安装完成后，左侧会出现“modbus”类别。</li>
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<li>拖拽 <code>modbus-read</code> 或 <code>modbus-write</code> 节点到流程图中。</li>
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<li>双击节点，点击“Server”右侧的铅笔图标，新增Modbus服务器配置。</li>
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</ol>
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<h3 id="modbusmaster">步骤三：配置Modbus主设备（Master）<a class="headerlink" href="#modbusmaster" title="Permanent link">¶</a></h3>
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<ul>
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<li><strong>连接类型</strong>：</li>
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<li>如果是TCP，选择“TCP”，填写Slave设备的IP和端口（通常为502）。</li>
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<li>如果是RTU（串口），选择“Serial”，填写串口设备（如<code>/dev/ttyUSB0</code>）、波特率、数据位、校验等参数。</li>
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<li><strong>Unit-Id</strong>：填写目标Slave的地址（通常为1）。</li>
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<li>其他参数按实际需求设置。</li>
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</ul>
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<h3 id="_2">步骤四：配置读写操作<a class="headerlink" href="#_2" title="Permanent link">¶</a></h3>
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<ul>
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<li><code>modbus-read</code> 节点：设置功能码（如03读保持寄存器）、起始地址、长度、轮询间隔等。</li>
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<li><code>modbus-write</code> 节点：设置功能码、目标地址、写入数据等。</li>
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</ul>
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<h4 id="modbus-read">Modbus-Read节点参数填写说明<a class="headerlink" href="#modbus-read" title="Permanent link">¶</a></h4>
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<ul>
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<li><strong>名称</strong>：自定义，便于识别。</li>
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<li><strong>主题（Topic）</strong>：可留空或自定义（如用于消息分流时填写），一般默认即可。</li>
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<li><strong>Unit-Id</strong>：填写目标 Modbus slave 设备的地址（通常为1，具体看你的设备设置）。</li>
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<li><strong>FC（功能码）</strong>：选择你要执行的Modbus功能码，常用如下：</li>
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<li>1：读线圈（Coil Status）</li>
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<li>2：读离散输入（Input Status）</li>
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<li>3：读保持寄存器（Holding Registers，最常用）</li>
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<li>4：读输入寄存器（Input Registers）</li>
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<li><strong>Address</strong>：要读取的寄存器或线圈的起始地址（通常从0或1开始，具体看设备手册）。</li>
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<li><strong>Quantity</strong>：读取的数量（如要读2个寄存器就填2）。</li>
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<li><strong>Poll Rate</strong>：轮询周期，单位为毫秒（如1000表示每秒读取一次）。</li>
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</ul>
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<p>举例（读取slave地址为1，保持寄存器，起始地址0，数量2，每秒轮询）：
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- Unit-Id：1
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- FC：3
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- Address：0
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- Quantity：2
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- Poll Rate：1000</p>
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<h3 id="_3">步骤五：部署与调试<a class="headerlink" href="#_3" title="Permanent link">¶</a></h3>
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<ol>
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<li>连接节点，点击右上角“部署”。</li>
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<li>查看debug面板，确认数据是否正常收发。</li>
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</ol>
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<h3 id="_4">参考示例<a class="headerlink" href="#_4" title="Permanent link">¶</a></h3>
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<div class="codehilite"><pre><span></span><code>[modbus-read] → [debug]
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</code></pre></div>
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<h3 id="_5">常见问题<a class="headerlink" href="#_5" title="Permanent link">¶</a></h3>
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<ul>
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<li>确认物理连接和串口权限。</li>
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<li>TCP模式下防火墙需放行502端口。</li>
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<li>RTU模式下需正确配置串口参数。</li>
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</ul>
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<p>如需更详细的配置说明，可参考<a href="https://flows.nodered.org/node/node-red-contrib-modbus">node-red-contrib-modbus官方文档</a></p>
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