Celestron Compustar Manuál s instrukcemi stáhnout pdf (Strana 16)

The Compustar Can Be Autoguided

Fortunately, the answer is “Yes, the Compustar does have some other type of guide port”, and

that almost seems like a miracle. It is another testament to the fact that the Compustar design was

far ahead of its time. When Celestron began producing the Compustars, the concept of

autoguiding barely existed. Other telescopes of that era had no provisions whatsoever for

autoguiding. It was not at all clear in what direction the field of autoguiding might go. Celestron

did not know if it would later produce autoguiders for the Compustars, or any of its other

telescopes for that matter. It was not known what type of equipment might be produced by other

manufacturers that might come to dominate the field, as occurred with SBIG‟s ST-4 (which was

not introduced until 1989, several years after the Compustar was designed) and ST-V. Despite all

these unanswered questions, the designers of the Compustar had the wisdom and foresight to put

autoguiding capability into it for possible future use. The autoguiding feature is briefly

mentioned in the Compustar Instruction Manual on pages 56, 59, and 60. Note that on page 56 it

clearly states autoguiding is not yet supported.

The Compustar Guide Port

The guide port on the Compustar is not located on the mount. It is actually located on the front

edge of the computer module (Figure 9). The front edge has 3 female computer ports, known as

DB-9 ports. DB-9 ports and plugs are D-shaped and use 9 pins (Figure 10).

Descriptions of the functions of these three DB-9 ports are printed in the Compustar Instruction

Manual. The right port is for an optional joystick that can be used to steer the mount. The left

port is for output to a printer. It is the center DB-9 port that is the guide port (it can also be used

for a second joystick). However, we obviously have a problem here. The output from the

autoguiding computer is being transmitted via an RJ-11 cable with 6 pins. The Compustar

computer module will accept inputs for autoguiding via a DB-9 port with 9 pins. One cannot take

the RJ-11 cable from the autoguiding computer, cut it and splice the wires to some of the pins on

a DB-9 plug, connect that to the center DB-9 port on the Compustar computer module and

expect it to work. We have to know how to these connections should be wired so the commands

from the autoguiding computer make sense to the Compustar computer module.

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Celestron Compustar Manuál s instrukcemi Strana 16