雷击和接地浪涌可在相连的远方通信终端间引起很大的瞬时电压差,因此,在两个通信端口内部都配备了浪涌保护装置。具有光耦合数据接口的隔离电源同时还可以减小噪声耦合。为最大限度地保证可靠性,所有设备应安装类似的暂态保护装置。同时,如下图所示,RS485电路的两端也应和-个阻抗进行端接。光纤通信端口能以10 Mbps的速度快速而有效地在保护装置之间进行通信,光纤可连接到支持多模式下波长为820纳米的保护装置上。只有9G和9H两种类型的CPU能够使用光纤。9HCPU双冗余配备了10BaseF的发送器和接收器用于光纤通信。
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