摘要：SMS-531是一款3G智能型的ModbusRTU短信及语音警报器。控制主机如PC、PLC、HMI及PAC等，通过RS-232或RS-485接口，利用ModbusRTU的命令就可传送短信或拨打电话预录好的语音到指定的电话号码群组。
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