Design of the Temperature Acquisition Module Based on Field-bus RS485
The design scheme of the temperature acquisition module based on Field-bus RS485 is presented. The overall design block diagram of the module is given. The measuring and amplifying circuit for thermistor signal, interface circuit for A/D conversion, interface circuit for isolated RS485 and switching power supply circuit are introduced in detail. The quadratic interpolation is used to calculate the temperature value. As the core of the module, the single-chip computer W77E58 makes multi-channel share the A/D conversion, gathers 8 signals from the thermo-resistances via the multi-channel switch, then converts them to temperature values which is transmitted to the industrial computer via the RS485 Field-bus under the mode of MODBUS protocol. This module can be used as the bottom layer module for temperature acquisition in computer control system.
RS485 temperature acquisition single chip microcomputer MODBUS protocol
YANG Xiao ZHAI Yu-wen AI Xue-zhong
College of Information & Control Engineering, Jilin Institute of Chemical Technology, Jilin City, China, 132022
国际会议
第八届国际测试技术研讨会(8th International Symposium on Test and Measurement)
重庆
英文
3194-3197
2009-08-01（万方平台首次上网日期，不代表论文的发表时间）