文章目录
- 背景
- 接线方式
- 安装RS485\USB转换接头的驱动程序
- 查看COM口号（Communication Port（通讯端口））
- 测试modbus数据传输
背景
买了个rs485 modbus协议的温度传感器，因为想接到windows上，用传感器厂家提供的调试程序调试，所以又买了个rs485转usb的转换接头。
接线方式
传感器提供了四根线，两根电源线，两根rs485的A、B线：
我把电源线（红黑）用12V的外接电源接上，然后RS485 A、B线（黄绿）接上转换接头的RS485 A、B口：
上面有RS485 A\B字样，所以一看就知道怎么接：
下面写的T/R+、T/R-（RS485默认采用的是差分信号传输，半双工模式）：
安装RS485\USB转换接头的驱动程序
把传感器卖家提供的驱动程序装上：
装完后它提示需要重启下电脑。
查看COM口号（Communication Port（通讯端口））
重启完电脑后，我们打开我的电脑–>管理：
点击设备管理器–>端口（COM和LPT），发现多个了USB-SERIAL CH340，它的COM口（Communication Port（通讯端口））是10，我们记下这个COM口号：
测试modbus数据传输
我们打开传感器厂家提供的测试程序：
我们把COM口设置为10，其他不管，然后点击读取，发现能正常获取温度数据：
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