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RS-232 Connectors

These serial port connections are used to connect your mount to your PC computer. You must provide your own cables with

a 9 pin (DB9) male connector to interface with the GTO panel. We have provided the locking posts to secure the cable

firmly. If your serial cable does not have a 9-pin connector, you can use a gender changer or adapter to convert it.

When you are controlling the position of the mount with a computer program such as DigitalSky Voice™ or TheSky™, the

microprocessor chip located in the servo drive box will send continual RA and Dec coordinate data via the cable

connections to your computer. When you use the software to give instruction to slew to a new object, the commands (RA

and Dec coordinates) are sent to the mount.

We provide two serial port connections on the mount so that you can use two software programs simultaneously. For

instance, you can give verbal commands in DigitalSky Voice while using TheSky as a planetarium program. Since the

mount will update the RA and Dec coordinates simultaneously, both programs are continually updated with the data from

the mount. You can watch the screen display of TheSky to see where your telescope is pointing as it slews. This is most

effective if you have a reasonably fast computer with plenty of RAM. If you try this with a 100MHz processor and only 32 MB

of RAM, the response time will be slow since both programs must be continuously updated with position data.

You must have two serial ports available on your computer to use take advantage of this feature. If you use a laptop, you

may need to purchase a PCMCIA adapter to gain an additional serial port. Socket Communications offers adapters for

many computers. Check out their web site at www.socketcom.com.

FOCUS Connector

Attach the 2.5mm phono plug connector of your JMI Motofocus or Meade electric focuser (optional accessories) here. Refer

to the section regarding focus adjustment in the GTO Keypad Manual for instructions on using the keypad controller to

adjust focus. Alternatively, you can verbally control the focus using the Focus Mode of DigitalSky Voice software.

RETICLE Connector

If you wish to use a plug-in type guiding eyepiece with an illuminated reticle (available from several manufacturers), insert

the 2.5mm phono plug into this connector for power. Reticle brightness can be adjusted with the hand control. Refer to the

section pertaining to reticle illuminator adjustment in the GTO Keypad Manual for further information.

AUTOGUIDER Connector

This connector interfaces with the RJ-11-4 modular jack of an autoguider cable, purchased separately or as part of a CCD

Imaging Camera or Autoguider. The autoguider will be functional and ready to go as soon as you plug it in. Please refer to

the appropriate manual from the manufacturer for operation of the autoguider.

We offer CABTIC (Tracking Interface Cable for SBIG ST-4 and ST-6 camera) and CAB7/8RC (Relay cable for SBIG ST-7

and ST-8 cameras). Please refer to our price list or call for further information.

+6V Connector

This 6 volt output accepts 2.5mm phono plugs. It is used primarily to power the Pentax 6x7 camera directly from the mount

with a cord sold for that purpose (our part # CORD01).

N and S Switch

Select northern (N) or southern (S) hemisphere as needed. When you slide the switch to the opposite position, the tracking

direction of the drive will reverse. The power cord must be removed and re-attached to make this work.

Prevent the Cables from Tangling

The movement of the mount across the meridian during slewing functions is calculated so that the cables will not tangle if

they are set up properly. In addition to the motor and power cables that are provided with the mount, you may have

additional cables for other accessories. These may be powered from the GTO Control Panel or from another power source.

We suggest that you position your cabling carefully to avoid a tangled mess. When your cables are set up, move the

telescope manually throughout the normal range of movement to be sure that the cables do not catch on anything and that

you have enough length. Here are a few pointers:

Accessory Cables

Accessories may include Kendrick Dew Removers, CCD cameras and autoguiders, focus motors, illuminated guiding

eyepiece reticles, power cords for the Pentax 6x7 camera, etc. As you attach each accessory, carefully assess the best

position to assure complete movement as your telescope slews from one side of the mount to the other. If an external

power source is used, determine the optimum location for the battery. We prefer to use tie wraps (not glamorous, but

effective) or cable ties (from electronic supply store or catalog) to secure our cables to the mount, telescope, rings or bind