Celestron Compustar Manuale delle Istruzioni Scaricare il pdf (Pagina 20)

Figure 12. The color coding and pin numbering of an RJ-11 autoguiding modular cable

jack. With the cable to the left and the copper wire pins of the modular jack to the right,

the pins are numbered 1 through 6 from top to bottom and the order of colors of the wires

connected to them is white, black, red, green, yellow, and blue, respectively.

It is for this reason that the modular jacks on opposite ends of an RJ-11 cable must have the

retaining clips on opposite sides. That is the only way that the white wire goes to pin 1on the top

of both jacks, the red wire goes to pin 6 on the bottom of both jacks, and all the wires in between

are connected to the same numbered pins on both jacks. Thus, with an RJ-11 cable that is

suitable for autoguiding the Compustar, it won‟t matter which modular jack you choose to check

the wiring. You will see the same order regardless of which you choose. It is critical that the RJ-

11 cable be of this type. If you procure an RJ-11 cable with the retaining clips on the same side,

then pin 1 on one jack connects to pin 6 on the other. The wire on pin 1 may be white or blue,

depending upon which side you choose. If you put the two modular jacks beside each other in the

orientation shown in Figure 11, each modular jack will be the mirror image of the other. Only

one of the modular jacks will have the necessary wiring scheme described above. Using this type

of RJ-11 cable can result in improper connections, short circuits, and permanent damage to the

autoguiding computer or, worse, the irreplaceable Compustar computer module. The safest way

to ensure proper wiring is to purchase an RJ-11 cable from an astronomy dealer. RJ-11 cables

that are certified safe for autoguiding are available from Shoestring Astronomy, for example, but

always be sure to check the modular jacks before using any RJ-11 cable.

This particular arrangement of the colored wires and pins of an RJ-11 cable modular jack implies

a reciprocal arrangement of the copper connection pins in a female port for an RJ-11 cable. The

reciprocal arrangement implies that if one looks into the port with the pins on the top and the

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Celestron Compustar Manuale delle Istruzioni Pagina 20