為了遠(yuǎn)程測量和控制多路設(shè)備溫度，采用一種積分電路精確測量PT100 熱電阻的阻值。同時(shí)采用AT89C51 單片機(jī)對所得數(shù)據(jù)進(jìn)行非線形補(bǔ)償，并通過RS-485 總線接口，將所獲得數(shù)據(jù)傳送上位機(jī)，以便真空控制系統(tǒng)的聯(lián)網(wǎng)控制。由于本模塊對輸入量同時(shí)采用硬件和軟件的非線形補(bǔ)償，故具有精度高、可靠性較好、電路簡單、成本低、體積小、生產(chǎn)調(diào)試方便等特點(diǎn)。
關(guān)鍵字：二線制；溫度；熱電阻；熱電偶；積分電路；RS－485 總線
The application of the multi-channel temperature measure module In Vacuum Controlling System Guo Yuhui 1,2 ， YihaiLiang 1,2, Wang Yanyu 1 ， Qiao Weiming 1 （1 Institue of Modern Physics,Chinese Academy of Sciences,LanZhou,730000） （2 Graduate School of the Chinese Academy of Sciences ，Beijing,100039） Abstract: In order to measure and control some multi-channel temperature of device, I had designed an integral circuit base on PT100 and adopt AT89C51 controller to make data linear compensate. The module makes use of RS-485 series bus to carry out a vacuum remote-control system. The integral circuit adopts both hardware and software nonlinear compensation technology. Therefore, it has many advantages such as high accuracy, high reliability, small volume, simple circuit , low cost ,easy debugging and so on.
Keywords：Two wire; Temperature; Heat resistor; Thermocouple; integral circuit; RS-485 series bus