What is the encoder resolution in the idea gotostar system for the astro5 equatorial goto mount ?

Question

I use the cartes du ciel to controle the mount from PC using the ASCOM platform : generic LX200 driver : asks encoder resolution : preset values are 60 integer arc second ? leave it like that ? correct ?

Answer 1

Hi there

Helpful Tips for Selecting An Encoder

There are two basic types of mounting options for rotary encoders with bearings: hollow bore or shaft type. A hollow bore encoder is designed to slide over and clamp onto a precision shaft with some form of a flexible mount that attaches to the motor frame. The fit between the bore and shaft and the design of the flex mount are critical for retaining accuracy and encoder bearing life. A shaft encoder is typically mounted to a fixed surface then coupled to a driven shaft. The alignment between the two shafts and the design and quality of the coupling are critical for retaining accuracy and encoder bearing life.

















While designing a motion system, it is important to identify an encoder resolution that reflects the true needs of the system. Too high of a resolution can increase costs and result in encoder frequencies that exceed either the encoders or the receiving electronics capabilities. Keep in mind that higher resolution does not necessarily translate into higher system accuracy. On the other hand, too low of a resolution may limit the systems ability to control speed or position accurately.

The output type of the encoder is generally dictated by the receiving device in the motion system. It is important that the person specifying the encoder determines the receiving device’s input requirements and then select the compatible encoder output driver. There are three basic types of encoder driver outputs, drivers that supply current to external devices (sourcing), drivers that provide a current path to circuit common (sink), and drivers that do both (line drivers). Many controllers accept differential line-driver signals, canceling common-mode noise while accommodating long encoder cable runs.

Encoders are available that are sealed to protect the internal optics and electronics from exposure to moisture, dust, and other potential contaminants. Environments that subject the encoder to corrosive or caustic chemicals may require special housing materials such as stainless steel. IP ratings will give you an idea of the sealing level of electronic components. Another consideration is the temperature of the environment the encoder will be functioning in. Encoders are available that can operate in ambient temperatures up to 120oC. Ambient temperature, and also heat generated from other mechanical devices (such as a motor) should be taken into consideration.

I hope that this answers your question.

Answer 2

Hi. I would use the defaults for now.