18B20的信号传输距离可以达到多远？一般的电线

数字温度计？Wikipedia上面对18B20使用的1-Wire bus接口是这样说的：。。。可传至100米以上的距离，制造商曾试过用双绞线传送到300米以外。。。看来很乐观。参照以下文字。

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Serial or USB "bridge" chips are also available that handle the timing and waveform requirements of the 1-Wire bus, and are particularly useful in utilizing long (greater than 100 m) cables effectively. Up to 300 meter long buses consisting of simple twistedpair telephone cable has been tested by the manufacturer. It will however require adjustment of pull-up resistances from say 5kΩ to 1 kΩ.
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