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正常使用CANopen从站电路在一次启动过程中不能收发数据，重启也无效，用USB转CAN和主站都不能检测CANopen从站的存大，用示波器量一测量ISO1050的3脚（TX）和4脚（地）就变正常了，电路板过几天上电有时又会出现这样的现象，会有什么原因会导致这样？
