GTOCP4 Software Version Updates

The software for the Astro-Physics GTOCP4 Servo Control box can be updated to the latest version from this page by following the procedures below.

Current Version: VCP4-P01-11

Download Program Package to Your PC
NOTE: The program package is an encrypted Zip file. To download the package you will need the correct username and password. It was provided in the cover letter that came with your mount's original documentation. If you do not have this information, please contact Astro-Physics, either by telephone (see below), or at Please provide us with your mount and/or GTOCP4 serial number when you contact us. That same Username and Password will then be required to unzip the encrypted folder containing the necessary files. You must unzip the contents of the zip folder into another folder before you can upload the new software! The Program Package contains the following:

Click on the link below to start the download process. Enter the username and password when prompted to do so.

VCP4-P01-13 Full Package

NOTE: this package includes WiFi module WiFi_A402. You may or may not need to install this module depending on the version you have now. If you are unsure, just install it anyway. It won't hurt anything to reinstall the module.

Unzip the downloaded zip file and save the contents in a convenient place. Most people simply save the contents into a new folder on the desktop.

Upload Software to Your Control Box
New software versions must be uploaded over an Ethernet connection. This can be either a direct peer-to-peer connection or through a wired local network. WiFi is not currently allowed for two reasons:

  1. WiFi is generally less reliable than cabled Ethernet.
  2. The software update may often include an update to the WiFi module software itself. This cannot be done over WiFi for obvious reasons. It would be like a surgeon trying to perform an organ transplant on him/herself.

Follow the instructions in the Field_CP4_Download-browser.pdf document. (included in the Full Package download as well) This is a PDF format document so you must have Adobe Acrobat or another PDF reader installed to view it. We offer the instructions here so that you can download them for review before downloading the software. We suggest that you print them as a reference.

GTOCP4 Manual
The latest GTOCP4 manual as found on our Tech Support page is linked here. You may already have this version of the manual, or you may have an older version. It is linked here for your convenience and is not required for the software update. This is a .PDF format document so you must have Adobe Acrobat or another PDF reader installed to view it.
File size: 3.14 MB.

Version History and Bug Fixes
Version History and List of Known Bug Fixes This is a PDF file.


Please click the button to get the latest version of Acrobat Reader.

Copyright © 2018, Astro-Physics, Inc. - All Rights Reserved
This page was last modified: May 8, 2019

Astro-Physics, Inc.
11250 Forest Hills Road, Machesney Park, IL  61115, U.S.A.
Phone: 815-282-1513   Fax: 815-282-9847