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Follow this simple installation procedure. Make sure to respect proper grounding, as described in Connecting the Ground Screw.


  1. Select a flat braided grounding strap of adequate length (as short as possible provides the best protection), with ring terminals on each.

  2. Attach one ring terminal to the ground screw on the OP5650XG.

  3. Attach the other ring terminal to the rack using a nut and lock washer.


Connecting the I/O Loopback Kit


  • 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 OP5650XG



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

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.

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.