Design of RS485 driver based on ARM and WINCE

FAN Zhong-qiang1， XV Ping2， JIANG Zhou-shu1
（1. College of Automation， Hangzhou Dianzi University， Hangzhou 310018， China； 2. College of Life Information Science & Instrument Engineering， Hangzhou Dianzi University， Hangzhou 310018，China）

Abstract：As the industrial equipment control requirements become increasingly complex，embedded industrial control systems become an inevitable trend. Due to its advantage such as excellent anti-interference ability，long transmission distance and multimode transmission ability，RS485 is applied most widely in the industrial control field. In order to develop the RS485 driver based on the ARM9 core and Windows CE system，firstly，the hardware design for RS485 was presented；secondly，the driver model and interrupt handling methods in Windows CE system was introduced；thirdly，the RS485 driver’s design process was given in detail，including the driver’s structure design，key functions design，the registration and load of driver. The experimental results indicate that RS485 driver runs stably and reliably.
Key words： Windows CE 5.0； RS485； stream interface driver； interrupt