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- Changchun Rongde Optics
- Co.,Ltd.
- Add：No.1666 Yaan Road,
- North Lake Development District,
- Changchun 130102,China
- Tel：86-431-81881745
- Fax：86-0431-85256892
- E-mail：rongdecui@roundss.net
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Changchun Rongde Optics Co.,Ltd. Release time：2016/10/12 Browse：696The output of an incremental encoder is a stream of pulses on one or two channels,while the output of an absolute encoder is a multi-bit word. This can be transmitted in either parallel or serial form.pulse encoder
Parallel Output
Parallel output makes all output bits available simultaneously. It may be provided as straight binary or transformed into gray code. Gray code produces only a single-bit change at each step, which can reduce errors. The table on page 6 shows an exam ple of conversion between straight binary and gray code. Some parallel-output encoders also can accept inputs from the outside—output latching commands, for example, and direction sense setting The advantage of parallel output is that it’s fast: all the data is available in real time, all the time.
Disadvantages include bulky (and expensive) cables and limited cable length. Most encoders come with cables a meter or two long, but a parallel output using differential output and shielded cabling can be extended to 100 m using a thicker cable, at a reduction in speed. Open-collector (sinking or sourcing) outputs can go roughly a third that far.
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