The rotary encoder 360 degrees per rotation number provided on or dark groove called the resolution, also known as analytic indexing, or direct say how much wire, usually 5 degrees per rpm to 10,000 lines.
There are many road reticle absolute encoder optical encoder, each groove successively with 2 lines, 4 lines, 8 lines, 16 lines. . . . . . Choreography, so that in every position of the encoder, by reading the engraved lines per channel through the dark, get a unique set of binary coded 2 ^ n-1 from zero to the power of 2's (Gray code), which is called n-bit absolute encoder. Such encoder is a mechanical encoder position determined, it is not a power outage, the impact of interference. Absolute encoder is determined by the mechanical position of the uniqueness of each location, without having to remember it, no need to find a reference point, and would not have to count, when you need to know where and when to go read its position. Thus, interference encoder properties, has greatly enhanced the reliability of the data.
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