实现对DS18B20的读取,注意：单总线协议对延时要求比较严格，此程序中采用的是11.0592M的晶振，如果使用其他的晶振请跟据DS18B20的资料修改延时参数 -DS18B20 achieve the right read, attention : single bus protocol to delay more stringent requirements, This procedure is used in the M 11.0592 Crystal Oscillator, If y

MBUS协议 The bus communication system of EN1434-3 is commonly called M-Bus. Its application layer describes a standard especially for meter readout. It can be used with various physical layers and with link layers and network layers which supp

The M-Bus protocol is a standard protocol for reading of counter devices like Heating or Electrical energy counters. M-Bus is normalized as EN 1434-3. Many counter manufacturers have implemented the M-Bus protocol in their products.