Celestron Compustar Instrukcja Obsługi Pobierz pdf (Strona 23)

Figure 14A (left). The pin out of a female RJ-11 modular jack connector, such as one on a

GPINT or GPUSB connector. The female plug will have pin 1 at the left and pin 6 on the

right in systems using the ST-4 language. This will be the pin out on the connector coming

out of the autoguiding computer.

Figure 14B (right) The pin out and color coding of wires of an RJ-11 male jack and cable

using ST-4 language. This is the pin out of the cable carrying the signals away from the

autoguiding computer toward the relay switches and, ultimately, the Compustar computer

module guide port.

Commands are now being carried from the autoguiding computer toward the Compustar mount

along 4 of the 6 wires of an RJ-11 cable, plus we need to use a ground on wire 2. However, the

DB-9 connector that will connect to the Compustar computer module guide port has 9 pins. So,

we will have to know how to make the correct connections from the wires in the RJ-11 cable to

pins on the DB-9 connector so that these commands make sense to the Compustar computer

module. Also, don‟t forget that we need to insert relay switches between the RJ-11 and the DB-9

to provide the electrical isolation and open and close the movement switches for us. As

mentioned above, it is best if these connections, relays and other electrical parts are wired and

contained in a small, portable box, which will be referred to as the “relay box” or the “interface

box”. However, we will need a wiring diagram to show how it should be done.

The Wiring Diagram

The wiring diagram that shows how the wiring should proceed from the RJ-11 pins coming out

of the guiding computer to the relay switches and then to the correct pins on the DB-9 that will

be plugged into the autoguider port on the Compustar computer module is show in Figure 15.

This is a modification of a wiring diagram that has been published by Dennis Borgman in at least

two places. One is the Compustar Users‟ Fan Page

(http://home.online.no/~gibala/astro/cct/index.htm) and the other is the Yahoo Compustar User‟s

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Celestron Compustar Instrukcja Obsługi Strona 23