描述
硬件故障常常表现为以下几方面
!模块的插件板与总线底板插接不严密;
!拨码开关错误;通讯线接线方向错误;
!终端匹配器未接;
!硬件跳线与实际信号要求的类型不一致;
!机柜内系统电源、现场电源输出有误;
!硬件本身坏。
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