Opus-Two Control Systems are made up by plugging together modular components.  The few number of components in a system leads to a very simple and easy to understand block layout.

  One controller card can control up to 30 I/O cards - plug cards together to form chains.  Add extender card kits to make chains longer.

One controller card can control up to 30 I/O cards - plug cards together to form chains.  Add extender card kits to make chains longer.

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Controller Card

C-IV Controller Card
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Every controller card we have ever made has a PipeBus port.  This enables the controller to communicate with all other Opus-Two controllers.  Modern controllers have many ports and connections; the current standard controller (the C-IV) features MIDI In, MIDI Out, MIDI Thru, 4 analog inputs (for swell or crescendo shoes), DisplayBus port to support one of our displays, and an Opus-Two port, which allows separate I/O card chains to be intelligently connected.  The Opus-Two port has not changed since the beginning of the system, and all Input, Output, and I/O cards are supported on every controller.  A small adapter board allows Flash Memory expansion or uSD memory expansion for a default of 250 levels of memory and 252 tracks of record and playback.  These numbers are not fixed and can easily change, please contact us for custom or larger requirements.

It is worth noting that the controller cards in a given system are located in the places that the I/O cards are located (typically one in the console, one in each pipe chamber, etc.).  The PipeBus connection to these cards is “parallel” – which means the PipeBus doesn’t have to go from card to card.  This means there isn’t a certain order that they have to be connected, and wire doesn’t have to be run in circles around a church just to make the organ play.  The PipeBus supports up to 256 controllers on one data bus (more than anyone will ever need).


Display Unit
from 350.00
Display Type:
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Opus-Two displays come in two flavors, an inexpensive LCD screen and a more elegant VFD screen.  Both are functionally identical, support 4×20 characters, and connect via the 3 wire DisplayBus connector on the controller card.  Modern display units are compatible with C-I, C-I-K, and C-IV controllers.  Both the LCD and VFD display allow for the ‘control buttons’ to be wired directly into the display’s backboard for wiring convenience.  If you do not have control pistons, we do sell them.


I/O64 LED Cards

I/O 64 LED Card
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The majority of cards installed in a system are the input/output cards.  One card does both input and output, and the majority of cards are supplied positive input/output.  These can be changed to negative by us prior to shipping, or by a user in the field by following conversion instructions, which are available upon request.  We also sell conversion kits with the correct number of chips and jumpers to make the process extremely easy.

Each pin on the card features a status LED which indicates the polarity of the pin.  This also serves to indicate whether the pin is energized or not.  You no longer need volt meters to troubleshoot inside consoles.  The card can show you exactly what is working and what isn’t.  If something is wired, and you aren’t sure where, the LEDs show you.  If you want to check the wiring order of a keyboard, simply look at the LEDs as you play up the keyboard.  The LED card absolutely revolutionizes how easy it can be to wire and troubleshoot a console, and must be experienced to be believed.

I/O64 cards get plugged in end-to-end to create a “card chain.”  When it is time to move to a new row, our extender card kits make it very easy and reliable to connect the data from one row to the next.

The standard card uses Toshiba TBD62783APG chips for output high cards and the TBD62083APG for output low cards.  The chips are rated for 500ma per pin.  The part numbers for the driver chips are silkscreened onto the card for convenience.


What you get by assembling a system

Once a system is assembled by plugging the cards above together in the methods described, it can be programmed to do absolutely anything.  As described in other sections of this web page, combination action, transposition, record/playback, MIDI interoperability, reversable controls, crescendos, and anything the organist can imagine are just a few lines of code away from reality.  We supply a programming guide with our software toolsets and programming cables to help a technologically savvy user get into the swing of things, and we can do all the configuration for you if you are not comfortable doing it yourself.  We have a network of dealers and savvy users throughout the country and are willing to connect you to one that is near you and may be able to help.