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  • 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 directly to the simulator DB37 Input signal
  • Connect the VUser (required to preserve isolation) from the loopback board to the OP5700 (see the Note below)


Connecting the loopback kit


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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 5V or 12 V 12V power source. Make sure that the Vuser source Source switch on the loopback board is set to “External”to “Ext.”. The switch is shown in the image below:

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        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.

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