An optical fiber is a dielectric (nonconductor of electricity) waveguide made of glass or plastic.

光纤是一种介（体电）波导的玻璃或塑料。

You can also monitor two independent loads by attaching a second optoisolator circuit to the Counter B input of a single DS2423.

也可以通配另一个光体电路到单DS2423计数器B的输出，来监测两个电阻负载。