论文部分内容阅读
介绍一种支持现场总线的数据采集模块，该模块采用隔离的ＲＳ４８５标准串行接口和标准通讯协议，直接支持网络。使用数字校零、软件滤波和看门狗技术保证模块运行的稳定性和可靠性。由软件选择传感器类型，支持常用各种型号的热电阻、热电偶、电流和电压等。温度线性化采用分段４次拟和算法，所有传感器的全温度范围精度优于０．１°Ｃ。
Describes a data acquisition module that supports fieldbus, which uses an isolated RS485 standard serial interface and standard communication protocols to directly support the network. The use of digital school zero, software filtering and watchdog technology to ensure the stability and reliability of the module operation. The sensor type is selected by the software and supports various commonly used thermal resistance, thermocouple, current and voltage. The temperature linearization uses a piecewise quadratic fit algorithm and the full temperature range accuracy of all sensors is better than 0.1 ° C.