Tech Note 1290 Detail

SW500/SW750 undetected by PASCO Capstone software via CI-6759A USB-to-Serial Adapter.

Affected Products:

CI-6759a USB/Serial Converter
CI-6400 ScienceWorkshop 500 Interface
CI-7650 750 Interface, USB

The ScienceWorkshop 500 or 750 interface is not detected by Capstone when using the CI-6759A USB - to- Serial Adapter.

PASCO Solution:


  • The CI-6759 (non-A) model is not compatible with Capstone software

  • CI-6759A model is compatible under the following configurations:
    • ScienceWorkshop 500
      • Windows XP
      • Vista 32-bit
      • Windows 7 32-bit & 64-bit
      • Windows 8 32-bit & 64-bit
      • MacOS 10.7 and higher
    • ScienceWorkshop 750-SCSI
      • Windows XP
      • Vista 32-bit
      • Windows 7 32-bit & 64-bit
      • Windows 8 32-bit & 64-bit
      • Mac OS 10.7 and higher


  1. Install the latest version of PASCO Capstone
  2. Turn on the ScienceWorkshop interface.
  3. Connect the CI-6759A adapter to a USB port and wait for Windows to detect device and install drivers.
  4. Run Capstone
  5. Click the Hardware Setup button in on the left tool palette
  6. Click Choose Interface.
  7. Select the type of ScienceWorkshop interface that you have connected to the USB-to-serial adapter.
  8. Click OK.
  9. An image of the interface should appear in the Hardware Setup window with a small green circle to the upper left corner
  10. If you see a yellow exclamation point symbol, follow the troubleshooting steps below

Troubleshooting Procedure

  • Unplug and replug the CI-6759A USB-to-serial adapter from the USB port.
  • If your computer has both USB2 and USB3 ports, connect to a USB2 port. Occasionally USB3 ports are not compatible with the CI-6759A adapter.
  • Toggle power on the ScienceWorkshop interface.
  • Reboot the computer

If the above steps do not resolve the problem, delete the PASCO USB/serial interface from the Device Manager and reboot the computer:

  1. Right click on My Computer.
  2. Select Properties.
  3. Select the Hardware tab.
  4. Click the Device Manager button.
  5. Expand the Pasco Interface Class category.
  6. Click on PASCO USB/Serial Converter.
  7. Press the Delete button.
  8. A "confirm device uninstall" window will appear. Click "OK". Do not select the checkbox "Delete the driver software for this device"
  9. Disconnect the CI-6759A and reboot the computer when prompted.
  10. When the computer is ready, connect the CI-6759A and wait for Windows to recognize the device and install drivers.

Creation Date: 10/15/2015
Last Modified: 02/4/2016
Mod Summary: