Abstract: Traditional RS-485 bus inclinometers have reached their limits in handling modern displacement monitoring issues which require faster communication speed and longer communication distance. To improve the communication performance of traditional inclinometers, a fully functional biaxial inclinometer system based on the CAN (Controller Area Network) bus has been developed in this study. The whole system has functions of data measurement, data collection, communication, data processing, man-machine interaction, and early warning. This study has managed to fix the mounting error problem that many other studies ignored as well by applying bivariate quadratic regression. The final experimental results indicate a total error less than 0.2%F.S.

Key words: in-place inclinometer, CAN bus, MEMS, biaxial orthogonal, mounting error, bivariate fitting