<p> 10.5.13</p> 

讯享网<strong>（0x11）报告从站ID（仅用于串行链路）</strong></p> 

<strong>1. 功能说明</strong></p> 

讯享网17功能码用于读取从站设备的ID、类型描述、当前状态以及其他<u>信息</u>，不支持广播模式。响应消息的构成依赖于设备而不尽相同。</p> 

<strong>2. 查询报文</strong></p> 

讯享网查询报文中不包含请求数据字段。举例说明，从站设备地址为5，获取相关信息，如下表所示。</p> 

<strong>功能码17查询报文示例：</strong></p> 

讯享网

讯享网 <strong>字段</strong></td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> <strong>例</strong><br /><strong>（Hex）</strong></td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> <strong>ASCII</strong><br /><strong>模式字符型</strong></td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> <strong>RTU模式8位</strong><br /><strong>（Hex）</strong></td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 帧头</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “：”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> </td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 从设备地址</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 0x05</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “0”，“5”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 0x05</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 功能码</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 0x11</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “1”，“1”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 0x11</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 差错校验</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> LRC（2字符）</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> CRC（2字节）</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 帧尾</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> CR/LF</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> </td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 合计字节数</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> 9</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 4</td> </tr></tbody></div><p> <strong>3. 响应报文</strong></p> 

对于从设备，在正常情况下，响应报文包括从站ID、运行状态以及其他附加信息，如下表所示。运行状态字段占用1字节，且0x00=OFF，0xFF=ON，而响应报文的组成则由<u>开发者</u>决定。</p> 

讯享网<strong>功能码17响应报文示例：</strong></p> 

 <strong>字段</strong></td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> <strong>例</strong><br /><strong>（Hex）</strong></td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> <strong>ASCII</strong><br /><strong>模式字符型</strong></td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> <strong>RTU模式8位</strong><br /><strong>（Hex）</strong></td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 帧头</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “：”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> </td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 从设备地址</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 0x05</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “0”，“5”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 0x05</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 功能码</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 0x11</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “1”，“1”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 0x11</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 字节数</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 设备相关</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> 设备相关</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 设备相关</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 从设备ID</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 设备相关</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> 设备相关</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 设备相关</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 运行状态</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 0xFF</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “F”，“F”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 0xFF</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 附加情报1</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 设备相关</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> 设备相关</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 设备相关</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> ……</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 设备相关</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> 设备相关</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 设备相关</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 差错校验</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> LRC（2字符）</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> CRC（2字节）</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 帧尾</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> CR/LF</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> </td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 合计字节数</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> 17</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 8</td> </tr></tbody></div><p> 10.5.14</p> 

讯享网<strong>Modbus异常响应</strong></p> 

以上介绍了一些常见的公共功能码的报文（消息顿）构成，广播模式以外的查询报文都希望能够获取一个正常的响应报文。在通常情况下，从站设备将返回一个正常响应报文，但是在某些特殊情况下将返回异常响应报文。</p> 

讯享网<strong>对于查询报文，存在以下4种处理反馈：</strong></p> 

①正常接收，正常处理，返回正常响应报文。</p> 

讯享网②因为<u>通信</u>错误等原因造成从站设备没有接收到查询报文，主站设备将按超时处理：从站设备接收到的查询报文存在通信错误（如LRC、CRC错误等），此时从站设备将丢弃报文不响应，主站设备将按超时处理。</p> 

③从站设备接收到正确的报文，但是超过处理范围（如不存在的功能码或者<u>寄存器</u>等），此时从站设备将返回包含异常码（Exception Code）的响应报文。</p> 

讯享网④异常响应报文由从站地址、功能码以及异常码构成。其中，功能码与正常响应报文不同，在异常响应报文中，功能码最高位（即MSB）被设置为1。因为Modbus协议中的功能码占用1字节故用表达式描述为：</p> 

异常功能码=正常功能码+0x80</p> 

讯享网举例说明，如下表所示，查询报文的起始地址为0x012C（十进制300），即需要读取寄存器地址为30301开始的值。若从站设备中不存在输入寄存器30301，则从站设备将返回一个异常响应报文，参见下表的功能码和异常码。</p> 

<strong>异常响应示例（功能码04查询报文）：</strong></p> 

讯享网 <strong>字段</strong></td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> <strong>例</strong><br /><strong>（Hex）</strong></td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> <strong>ASCII</strong><br /><strong>模式字符型</strong></td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> <strong>RTU模式8位</strong><br /><strong>（Hex）</strong></td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 帧头</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “：”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> </td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 从设备地址</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 0x07</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “0”，“7”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 0x07</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 功能码</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 0x04</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “0”，“4”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 0x04</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 起始地址<br /> （高位）</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 0x01</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “0”，“1”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 0x01</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 起始地址<br /> （低位）</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 0x2c</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “2”，“c”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 0x2c</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 寄存器数<br /> （高位）</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 0x00</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “0”，“0”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 0x00</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 寄存器数<br /> （低位）</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 0x03</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “0”，“3”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 0x03</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 差错校验</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> LRC（2字符）</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> CRC（2字节）</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 帧尾</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> CR/LF</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> </td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 合计字节数</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> 17</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 8</td> </tr></tbody></div><p> <strong>异常响应示例（功能码04响应报文）：</strong></p> 

 <strong>字段</strong></td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> <strong>例</strong><br /><strong>（Hex）</strong></td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> <strong>ASCII</strong><br /><strong>模式字符型</strong></td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> <strong>RTU模式8位</strong><br /><strong>（Hex）</strong></td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 帧头</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “：”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> </td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 从设备地址</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 0x07</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “0”，“7”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 0x07</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 功能码</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 0x84</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “8”，“4”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 0x84</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 异常码</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 0x02</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> “0”，“2”</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 0x02</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 差错校验</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> LRC（2字符）</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> CRC（2字节）</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> 帧尾</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> CR/LF</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> </td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="21%"> </td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="19%"> 合计字节数</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="28%"> 11</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="32%"> 5</td> </tr></tbody></div><p> 常见的异常码如下表所示：</p> 

讯享网<strong>常见异常码说明：</strong></p> 

 <strong>异常码</strong></td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="26%"> <strong>名称</strong></td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="61%"> <strong>说明</strong></td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="13%"> 01</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="26%"> 非法功能码</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="61%"> 从站设备不支持此功能码</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="13%"> 02</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="26%"> 非法数据地址</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="61%"> 指定的数据地址在从站设备中不存在</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="13%"> 03</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="26%"> 非法数据值</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="61%"> 指定的数据超过范围或者不允许使用</td> </tr><tr><td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="13%"> 04</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="26%"> 从站设备故障</td> <td colspan="1" rowspan="1" style="border-color:rgb(62,62,62);padding:0px;" width="61%"> 从站设备处理响应的过程中出现未知错误等</td> </tr></tbody></div><br />