按这个说法的话那这个网络就没法实现点对点，全部都是广播了，但是我看modbus里有规定数据帧格式里带有地址域，并且能实现点对点 images/back.gif
A Modbus command contains the Modbus address of the device it is intended for. Only the intended device will act on the command, even though other devices might receive it (an exception is specific broadcastable commands sent to node 0 which are acted on but not acknowledged).
估计你说的应该是modbus tcp
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