使用SJA1000构成CAN网络智能节点时参数的确定

Decision on Parameters by Using SJA1000 to make up CAN Network Intelligent Nods

CAN总线以其简单、可靠得到行业广泛的认可,而SJA1000由于具有较好的性能成为目前设计CAN智能节点和构成CAN网络时的首选通讯控制器。但总线上各节点ID值的选择、位速率的确定等,成为实际使用它的一大障碍。本文从实用的角度详细介绍了参数的选择、位速率与传输距离的关系以及决定位速率的两个总线定时器值的计算。

The advantage of CAN bus is simple and reliable, and SJA1000 is selected as the first communication controller to structure a CAN network by its predominant capability. But its application was embarrassed by some factors such as selecting node identifier, calculating the bit rate, etc. This article presents the selecting of parameter, the relationship between bit rate and distance and the way of ascertaining the value of bit time register(BTR) in detail.