In October 2015, we introduced our GTOCP4 Control Box, the newest in our line. The GTOCP3 Control Box will be available while quantities last.
900GTO, 1100GTO, 1200GTO, 1600GTO, 3600GTO and the
feature high-quality DC servo motor drive electronics, the rugged GTOCP3 Control
Box and our GTO handheld computer Keypad for GoTo operation. These sophisticated,
versatile mounts can be operated with the GTO
handheld computer keypad alone or in conjunction
with various popular software packages on your
Windows-based or Mac computer or mobile smart device.
The GTOCP3 Control Box contains all of the circuitry to drive the two servo motors and the logic required to circumnavigate the sky. It functions as "the brains" of your mount translating the commands that are received from external software (Keypad, planetarium program or other software) into electrical signals to the motors to produce movement and other critical functions. It also makes all the required calculations and determines the safe and proper path for GoTO slews.
The main function of the GTO Control Box is
to drive the R.A. and Dec. motors, which are DC
servos with built-in shaft encoders. The rotation
rate and precise number of rotations of each motor is controlled
with a servo feedback loop. The servo looks at the return
pulses from the shaft encoders and adjusts the
current to the motor so that the rate is identical
to the commanded rate (i.e. from .25x sidereal
to 1200x sidereal). The precise number of motor rotations is translated
into incredibly accurate R.A. and/or Dec. distances.
This electronics box is mounted directly on the R.A. axis of the 1200 and 900 mounts (as shown in the photo), on the side plate of the 1600 and 3600 and is a stand-alone unit for the Mach1, 1100, 400 and 600E mounts. The freestanding unit attaches to your pier or tripod with the handle on the fabric pouch or the Control Box Adapter (CBAPT) both included with the Mach1GTO.
The GTOCP3 shipped with the Mach1GTO mount is completely black-anodized to match the mount. The control boxes shipped with the 900GTO, 1100GTO, 1200GTO, 1600GTO and 3600GTO mounts have a black-anodized panel where the connectors are located and the remainder of the box is painted the same cream-white as the mounts.
| Control Features
The command language protocol that is programmed into the microcontroller of the GTOCP3 Control box allows the sophisticated control functions of your mount. Please keep in mind that the software that communicates with the mount will determine which commands are utilized. For instance, although the control box is programmed to include a command that can implement a timed guide move, if the software does not issue the command, this feature cannot be used.
For optimum utilization of the advanced functions in the command language protocol, we recommend that you control your mount with either the GTO Keypad, software that utilizes the ASCOM V2 driver or the Astro-Physics Command Center (APCC). All of these control options were written by Astro-Physics. For more information, see: Control Your GTO Mounts with Your Keypad, Computer or Mobile Smart Devices.
Here are some of the key features and functions available in the latest versions of the GTOCP3 Control Box:
| Mechanical Features
|Dimensions of servo box||4.9" x 4.9" x 1.8" (12.5 x 12.5 x 3.4cm)|
|Weight||1.5 lbs. (0.7 kg)|
|Suggested power sources||Portable 12V battery pack, auto or marine battery
110 to 12V DC Power Supply (5 amp minimum, regulated and well-filtered to prevent spikes), like our 13.8-volt, 5-amp power supply (PS138V5AC) . For the 1200GTO mount with a heavy load in colder climates and for the 3600GTO, we recommend the 15-volt, 12-amp power supply (PS15V12AC)
|Standards||Meets FCC and CE standards|
Astro-Physics GTO Servo Motor Drive System - Model GTOCP3 - Manual
Upgrade and Purchase Information
October 16, 2015 Update - New GTOCP4 release expected in December!
The GTOCP3 is not available at this time for separate purchase. Click the GTOCP4 webpage for more information and look for future announcements regarding how you can upgrade to this latest control box.
Chip Upgrade for GTOCP3 Control Box
If you already own the GTOCP3 control box, you may wish to consider upgrading the ROM chip to take advantage of the newest features and bug fixes which can impact your mount's performance.
Here is list of the Revisions to the ROM chip. (PDF document)
Upgrade procedures and information to obtain the most recent ROM chip. Back to top
Please refer to Keypad page for complete information.
Back to top
Keypad Protector (KEYPRO)
Please refer to Keypad page for complete information
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Inc. - All Rights Reserved
This page was last modified: October 16, 2015
11250 Forest Hills Road, Machesney Park, IL 61115, U.S.A.
Phone: 815-282-1513 Fax: 815-282-9847