中文版
Description
The Abaco Systems/SBS/green spring LP-Orthogonal four-channel decoder IndustryPack module provides a high density, cost-effective, flexible implementation of four-person orthogonal decoder channels. Channels can also be used as universal counters. Four independent channels provide 24-bit resolution, programmable mode, programmable polarity, interrupt capability, differential or single-ended (RS-422 or TTL/CMOS) input, dynamic read capability, and count frequencies from 0 to 10 MHz
Orthogonal encoders are popular sensors that provide accurate, low-cost incremental motion detection, the most common being axial encoders, which provide 512 to 2048 counts per revolution, and they are also commonly used as linear encoders with resolutions as low as 0.005 J. They are available in almost any length, and most encoders today are optical, using a transmission component consisting of a pair of light-emitting diodes, a lens, light sensing, and simple electronics. For rotary motion, the component senses alternating opaque and clear lines on the rotating wheel, and for linear motion, the alternating lines can be on a fixed rod as the sensing component moves,
and vice versa. This pair of leds and light sensors shifts about half a line stream, allowing the direction of motion to be sensed by looking at the relative phase of the two outputs. A typical orthogonal encoder output is a pair of digital love signals with a nominal phase difference of 90%. Some encoders also provide an “indexed” pulse output per revolution to provide position information, most modern encoders use a +5 volt voltage and provide a CMOS/TTL logic output and/or RS-422 differential logic output, if possible, RS-422 is recommended because of its inherent immunity and long distance transmission capability. TTL Logic levels should generally be limited to cables less than 10 feet in length. Orthogonal encoders are available from Hewlett-Packard, US digital, and other sources.
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