Upgrade to GTOCP4 Control Box
The information provided on this page will guide you to the parts that are required to upgrade your current Astro-Physics GTO mount to the GTOCP4 Control Box.
Upgrade ProceduresWho do you order from? All orders for the GTOCP4 Control Box must be placed directly with Astro-Physics, except for customers who ordered their mount from one of our international dealers.
1. Read the GTOCP4 Upgrade
and Installation Guide (PDF
document) in order to learn how the CP4 will attach to the mount that you already own and which parts you will need to order.
GTOCP4 Control Box (GTOCP4)
|Please refer to the GTOCP4
Control Box webpage to learn more about the features and functions.
Be sure to follow the upgrade instructions above.
We must have information regarding your current GTOCP1, GTOCP2 or GTOCP3
control box before we can process your order. You may need to purchase additional accessories.
We recommend that you keep your original control box and cables as backups in case you have any problems in the future.
CablesPower Cable Set for GTOCP4 (CABPP4SET)
|The power cable set for the GTOCP4 is a completely new design. The receptacle on the GTOCP4 is now a 2-pin jack with locking collar. Users will find this to be a more solid and consistent connection than previous control boxes.|
The Power Cable Set (CABPP4SET) is comprised of all three cables and a clip:
You may also create your own extension cable by using Anderson Powerpole connectors
and components purchased on the Powerwerx website. Securing clips can also be purchased directly from their website.
CP4 Powerpoles to Alligator Clips (CABPPAL)
Expand the versatility of your mount. This alligator clip power cable adapter enables you to power your mount from a car or a deep-cycle marine battery (deep-cycle batteries are recommended). Equipped with Anderson Powerpoles, as used with the CP4 power cable, you can connect directly to battery terminals. Includes 7.5 amp in line ATC fuse.
Don't feel restrained...grab your mount and a battery and head to a dark sky site!
|Y-Cable with 29" cable length for the RA and 50" for Dec.|
We recommend this cable if you have a 1200GTO and your GTOCP4 is mounted on the Control Box Adapter (CBAPT) positioned on the side of your pier.
Mounts that can use this cable:1200GTO
|Y-Cable with 23" cable length for the RA and 45" for Dec.|
We recommend this cable if have a 900GTO and your GTOCP4 is mounted on the Control Box Adapter (CBAPT) attached to the side of your pier.
Mounts that can use this cable: 900GTO
|If you are upgrading your
900GTO or 1200GTO from the GTOCP1 Control Box and plan to mount the control
box on the RA axis, you will need this cable cable for your mount.
The GTOCP4 Control Box has one output connection for the RA and Dec motors. We accomplish this by providing a single connector and two cables, one for each motor. We call this configuration a Y-cable.
This cable was included with mounts shipped with GTOCP2 or GTOCP3 Control Boxes.
Mounts that can use these cables: 900GTO (S900GYCR) and 1200GTO (S1200GYCR).
|If you have the precision encoder version of
the 3600GTOPE mount, the cable that attaches the encoder
connector on the backplate to the GTOELS must be replaced. The plug on
the control box side of the original cable is not appropriate for the
GTOCP4 and additional length is required.
Mount that can use this cable: 3600GTOPE (with RA Precision Encoder)
|If you have limit switches installed on your
3600GTO or 3600GTOPE mount, the cable that attaches
the limit switch connector on the backplate to the GTOELS must
be replaced. The plug on the control box side of the original cable is
not appropriate for the GTOCP4.
Mount that can use this cable: 3600GTO or 3600GTOPE (with Limit Switches)
Adapters for Attaching Control Box to the RA axis of the mount
90-Degree Dovetail Adapter
Plate for 900/1200 for RA-mounted GTOCP4 (CBA912KIT)
If you wish to mount the GTOCP4 between the forks and use the original Y-cable supplied with the mount, then you will need to use the 90-degree adapter plate so that the box can be rotated to fit. This adapter attaches to the back of the GTOCP4, which allows it to be fastened to the Quick Release Bracket on the RA axis.
900GTO: The adapter must be used at all latitudes.
1200GTO: This adapter is not necessary if you plan to use your 1200GTO mount above 37.5 degrees since the control box will clear the side plates at that latitude. However, if you think that you might travel to another observing location at a lower latitude in the future, we suggest that you purchase and use the adapter. Otherwise, you may be unable to attach the GTOCP4 once you get there.
Mounts used with this adapter: 900GTO, 1200GTO
Includes:Two 10-32 x 3/8" button head cap screws
900GTO Quick Release Control Box Adapter Kit (9CBKIT)
If you are upgrading your
900GTO from the GTOCP1 and plan to attach the new control box to the RA
axis, you will need this adapter kit. It features a dovetail
systen so that the GTOCP4 (with the CBA912KIT afixed)
or GTOCP3 control box can be attached. It will allow you to loosen
the two thumbscrews and lift the control box from its position.
We also provide two set screws if you prefer
to use them.
Mounts: 900GTO only.
1200GTO Quick Release Control Box Adapter Kit (12CBKIT)
If you are upgrading your 1200GTO from
the GTOCP1 and plan to attach the new control box to the RA axis, you
will need this adapter kit. It features a dovetail systen so that
the GTOCP4 (the CBA912KIT is needed if below 37 degree latitude)
or GTOCP3 control box can be attached. It will allow you to loosen
the two thumbscrews and lift the control box from its position. We also
provide two set screws if you prefer to use them.
Mounts: 1200GTO only.
Adapters for Attaching Control Box at the Base of the Mount or on Your Pier or Tripod
Pier/Tripod Control Box Adapter
900GTO and 1200GTO: If you plan to purchase the GTOCP4 and attach it to the side of your pier, rather than the R.A. axis, this is the adapter that you will need.
The Control Box Adapter features thumb screws on one end and a dovetail on the other to fit the dovetail grooves on your control box. The adapter can be mounted from four different attachment points including the top one which angles the control box out a bit to clear legs or struts. The adapter also can be mounted with either end up or down if a particular orientation works better for your situation. A full assortment of fasteners is provided for the various mounting applications. See our Guidelines for Using 6" Trays and the Control Box Adapter for more information.
If you find that parts of your pier or tripod interfere with the placement
of this adapter, you may wish to consider our Q6280KIT,
which features a
CBAPT on 6" Eagle with GTOCP3 attached
|This Pier/Tripod Control Box Adapter (CBAPT)
can be used with the GTOCP4, GTOCP3 or GTOCP2 control boxes when they
are mounted on the side of a pier or tripod.
It might be possible to use it with OEM mounts that use our GTO Servo Drive System depending on the pier configuration. Please refer to this link for additional information.
Note: If you plan to use this adapter with your 900GTO or 1200GTO mount, you will need a longer y-cable ( SGYCR2345 or SGYCR2950, respectively).
Mounts used with this adapter: Mach1GTO, 400GTO, 600EGTO, 900GTO and 1200GTO
Extension for Pier/Tripod Control Box Adapter (Q6280KIT)
Mach1GTO, 600EGTO and 400GTO
Effective length of extension: approximately 1.8" (46mm)
Includes: one 5/16-18 x 5/8” BHCS and one 5/16 ID x 9/16 OD washer
Note: The Q6280KIT in the photo at left is shown as silver for easy identification in its mounted position. It is anodized black as a finished product (see above left).
1100GTO Single Control Box
If you own an 1100GTO-AE or 1100GTO-AEL, your mount
has a double control box bracket to accommodate your GTOCP3 and
GTOAE Control Boxes side by side. You can continue to use the double
bracket by mounting the GTOCP4 off-center and then securing it to the
Includes: two 8-32 x 3/8" Thumbscrews.
Mounts used with this adapter: 1100GTO or any other mount that is bolted to a flat square plate.
1100GTO Control Box Extension Adapter (Q6281KIT)
The 1100GTO has an extension adapter to allow its Control Box (single or double adapter) to be used when upscaling to a 10” ATS pier. If you have a custom pier that requires even more spacing, then the new extension can be stacked with as many extensions as needed to do the job.
The adapter adds 1" (25.4 mm) of spacing.
Includes: two 8-32 x ½” BHCS
Note: The Q6281KIT in the photo at left is shown as silver for easy identification in its mounted position. It is anodized black as a finished product (see above left).
Copyright © 2016,
Astro-Physics, Inc. - All Rights Reserved
This page was last modified: December 20, 2016
11250 Forest Hills Road, Machesney Park, IL 61115, U.S.A.
Phone: 815-282-1513 Fax: 815-282-9847