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Place the OP5705-IO on a shelf or a desktop, or install it in a standard 19" rack.
Connect all the cables as describe below.

  • Make sure to


    respect proper grounding, as described in the Ground Screw section below.

  • When installing an OP5705-IO in a system, it is important to have all connections completed before turning the unit on.

Connecting the Cables

These are the basic cabling instructions for your OP5705-IO.
Use the cables provided to connect your devices, as instructed.


Use the SFP transceivers and LC-LC multimode fiber cable (sold separately) with the unit to connect one of the I/O Expansion Unit’s SFP ports to one of the real-time simulator’s SFP ports configured for MuSE communication.

  • Unless otherwise specified in the System Description document of your unit, any of the 4 SFP ports can be used for MuSE communication.

  • When using SFP ports for Generic Aurora communication with other OPAL-RT units or external devices, additional SFP modules and optical fiber cable are required (not provided).

Power Cord

Connect the power cord to the unit and plug it into an appropriate power source (outlet).Image Removed


Ground Screw

You must must connect a grounding cable from  from the OP5705-IO ground screw to the rack the rack (or any other other strong ground) to ensure that the unit terminates securely in a ground.
Proper grounding helps prevent electric shocks, protects the unit from voltage spikes (from a variety of causes, including lightning strikes), and provides increased immunity from EMI by lowering noise levels and emissions.

  1. Select a


  1.  flat braided grounding strap


  1.  of adequate length (as short as possible provides the best protection), with ring terminals on each.


  1. Attach one ring terminal


  1.  to the ground screw on the OP5705-IO.

  2. Attach the other ring terminal to


  1. the rack using a nut and lock washer.


DB37 Cables

Connect the DB37 cables from the OP5705-IO to external devices (motor, controller, etc.).


Before connecting cables, make sure that the amplitude is compatible with the voltage ranges of the OP5300 mezzanine modules installed.


Testing I/O Signals

Before using your OP5705-IO, we recommend running the RT-LAB or HYPERSIM integration model delivered with your system.
If the I/O configuration is symmetrical (same type and the number of inputs and outputs), it is good practice to test I/O channels using the loopback board provided with the integration kit, which lets you read any feedback from outputs to inputs.

Connecting the I/O Loopback Kit


The following procedure is only used for test purposes when no external source is available.

The loopback kit included in the starter kit allows users to test system signals. The connection is made easy with a custom flat cable that matches OPAL-RT standard DB37 pin assignments.

  • Connect one end of the flat cable to the loopback board

  • Connect the loopback board to the simulator DB37 Output signal

  • Connect the other end (DB37 connector) of the flat cable to the simulator DB37 Input signal

  • Connect the


    Vuser (required to preserve isolation) from the loopback board to the OP5700

Image Removed


For more information about the use of Vuser and Vrtn pleaser refer to this article in the OPAL-RT knowledge base : How to power the different DB37 boards for digital outputs.



Although some boards do provide a power source, using that would compromise the isolation.
OPAL-RT recommends using an external power source:

  • The user must connect the power wires (provided) to either a 5 or 12 V power source.

  • Make sure that the Vuser source switch on the loopback board is set to “External”.

The breakout board provided allows users to access each pin of the DB37 separately through the screw terminals.
Simply insert the breakout board DB37 connector onto the desired DB37 connector on the simulator.Image Removed


Refer to the system description document or the user manual of the OP5300 Mezzanine Modules installed in the system for exact pin assignments.