ModbusRtuRead 方法

读取支持Hsl特性的数据内容，该特性为HslDeviceAddressAttribute，详细参考api文档说明，或是官网的详细文档
Read the data content of the Hsl attribute. The attribute is HslDeviceAddressAttribute, please refer to the api documentation for details.

从Modbus服务器批量读取寄存器的信息，需要指定起始地址，读取长度，如果富文本地址不指定，默认使用的功能码是 0x03，如果需要使用04功能码，那么地址就写成 x=4;100
To read the register information from the Modbus server in batches, you need to specify the start address and read length. If the rich text address is not specified, the default function code is 0x03. If you need to use the 04 function code, the address is written as x = 4; 100