RS-485 多站串口连接 对于多站配置, 主机设备被配置为主站其他一个或多个 PLC 被配置为从站。主站和任何从站之间远距离不能超过 4000 英尺 (1200 米)。下图假定高品质电 缆及适度噪声环境。 菊花链或多路配置时使用 RS 485 多 8 个从站。RS 485 电缆必须包括握手信号线且使用之前的线型号。
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