GETTING STARTED: The 905: Compact fORP Package

The new 905 fORP system is a low cost, complete package for recording subject responses in fMRI settings.


  • Interface
  • 12-fiber removable bundle
  • 5-button response pad
  • USB cable

Front Panel

The USB connection is made to the small USB connector on the front panel, shown here on the right (as P1).

The front panel also has 6 LED indicators, for trigger and button status.


Rear Panel

The optical connections are made to the rear panel. You can connect most optical handheld devices directly to the optical port (P4), or through long removable bundle to that port.

The 905 will also accept TTL and optical trigger inputs on ports P3 and P2, shown here.


The TTL input is positive edge-triggered and has a weak internal pullup resistor (47 k ohm). There is no minimum pulse width for the TTL input.

Set Up

  1. Attach the handheld to the interface with or without the removable fiber optic bundle to P4.
  2. Attach the USB cable from P1 to a computer.
  3. Optional: connect trigger-in cable to the TTL SMB (P3) or Main.Optical HFBR connector (P2).

The interface is powered by the USB port and automatically adjusts the light levels for use with or without the bundle.

User Tips

  1. Attach the handheld before attaching to the computer.
  2. If it's not working properly, detach and reattach the USB cable.
  3. Make sure the connectors are fully attached.
  4. The interface sets its optical gain based on what is connected at the moment that the USB cable is connected. If you add the removable bundle, you will need to reset the gain by reattaching the USB.

Standard Outputs

This interface is often in used in pairs for 5 buttons from the left hand and 5 from the right. Those outputs are:

Button Keycode
1 1 6
2 2 7
3 3 8
4 4 9
5 7 0
TTL trigger t t
Optical Trigger o o

If you're using two FIU-905's at the same time, its a good idea only to trigger one of them.


If you have any questions or suggestions, please contact us here:

Current Designs, Inc.
3950 Haverford Ave.
Philadelphia PA 19104
Phone: 215 387-5456
Fax: 215 386-4857
Topic attachments
I Attachment Action Size Date Who Comment
fp1.pngpng fp1.png manage 25 K 23 Feb 2021 - 19:46 BenDugan  
rp1.pngpng rp1.png manage 57 K 23 Feb 2021 - 19:46 BenDugan  
webbrochurelogo.pngpng webbrochurelogo.png manage 3 K 23 Feb 2021 - 19:57 BenDugan  
Topic revision: r2 - 16 May 2022, BenDugan
This site is powered by FoswikiCopyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding Foswiki? Send feedback