矿用CAN总线中继器的设计

摘要

介绍了两种CAN总线中继器即硬中继器和软中继器的设计方法.硬中继器电路简单,但降低了CAN总线传输距离或者传输速率;软中继器通过CPU中转数据,升级方便,且具有数据滤波功能,可降低总线负载,但不适用于时序要求较高的CAN总线系统.这两种中继器均在现场得到验证,可根据实际需要选用.%The paper introduced design methods of two repeaters of CAN bus, namely hard repeater and soft repeater. Hard repeater has simple circuit but short transmission distance or small transmission rate of CAN bus. Soft repeater uses CPU to transfer data with convenient upgrading and has data filtering function to decrease bus load, but which is not suitable for CAN bus system with high requirement of time sequence. Both of the repeaters are verified at field and should be selected according to actual system.