：提出了一种单总线上多个数字温度传感器DS18B20的自动识别方法。通过设计由译码器74LS138、二输入四

与非门74LSOOP、模拟开关CD4066组成的电路，同时应用Keil C51工具编写DS18B20数字温度传感器软件程序，在单片

机的控制下，系统以开机初始化形式获取并保存所有传感器的序列号，自动识别传感器并进行多点测温。实验结果表明，

系统能将获得的序列号与各传感器对应起来，使传感器可即装即用，实现了真正意义上的自动识别。-A method of the automatic identification of multiple DS18B20 digital thermometers on a 1一W ire bus has been offered

by designing a circuit composed of a 74LS138 decoder，two 74LS00P quad 2-input NAND gates and two CIM066 quad bilateral

switchs，and writing programs using Keil C51 for accessing these DS18B20s．Under the control of SCM ，the system reads and

stores all DS18B20s’ROM codes in the form of initialization after the system is powered on，and then identifies the thermometers

automatically and measures the muthi—point temperature．The experiment result shows a one—to—one correspondence between the

DS18B20s’ROM codes is read and the temperature measuring points，which enables the therm ometers’plug and play．So the sys—

tern realizes the automatic identification in the real sens