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Auto guiding is a method of correcting errors in the natural tracking of a mount with RA drive. The RA drive can be a stepping motor or a servo loop system or both. To keep the RA synchronised the controller reads the position of the drive and adds or subtracts correction usually in the form of a pulse to keep the mount pointing in the direction dictated by the total pulse count of the drive system.
To compliment this the drive system usually has a secondary input system that can add or subtract pulses from a device that tracks a star. Depending on the electronics this system can be directly compatable with the mount electronics. The ST4 system is the most common and is used by most controllers however if it is not compatable the control is transfered by relays that can make the systems compatable.
Barry
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