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售前咨询-杨: 19381903226
售前咨询-朱: 19381904226
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本章节主要演示如何通过EG8200Mini网关采集/控制485连接的ET系列扩展IO接口。实现此流程，需要做以下操作：
网关对接Modbus协议的传感器和对接ET系列模块是一样的方式，可以参考此流程设置
1.1. 接线
分别给EG8200mini和ET系列扩展模块的第一台模块提供供电，将第一台ET模块的485接口连接到EG8200mini的485接口上即可。
1.2. 地址设置
保证级联设备的地址不能冲突，如上图，级联的ET1010和ET1020地址通过拨码开关分别设置的为1和2，拨码开关地址设置可以查看：
此处为语雀内容卡片，点击链接查看：https://iotrouter.yuque.com/org-wiki-iotrouter-rlzwv5/et/klzc0arw609wso91?inner=kEYXr
2.1. 数据采集
ET1010/1020模块为Modbus RTU协议，要通过RS485接口采集Modbus RTU协议数据时，我们需要提前获取ET模块的站地址/功能码/寄存器地址/串口参数。
站地址：1（以级联模块的第一台的地址为准）
功能码/寄存器地址：详情看寄存器地址表
串口参数：9600/8/1/无校验（波特率通过拨码开关修改）
扩展模块的IO有4种类型，所以我们需要用4个Modbus读节点，分别读取不同类型的IO数据，且采取轮询的方式：
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2.2. 数据控制
这里以控制AO1输出10mA和控制DO1输出为1为例：
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3. 注意
如果需要通过云端进行数据的监控，可以参考其它示例，例如：https://iotrouter.yuque.com/org-wiki-iotrouter-rlzwv5/eg8000/hoegmzz8ebnc173x
ET设备调整拨码开关重启生
