====== High Current Adapter for NI myRIO ======
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===== Overview =====


The High Current Adapter for NI myRIO allows you drive high power low speed currents using relays and open drain N-FET otputs trough MXP connector on your myRIO. The switched signals are connected with screw terminals. For open drains a power supply is needed.

Key Features:

  * Supports 3V...16V power voltage(external power supply required)
  * 4 Open drain outputs
      *Continuous current:3.0A(25°C)/2.2A(85°C)
      * Peak output current:4.1A(t<5s)
  * 4 Standard 3 terminal relay outputs
      * Common, Normally Closed, Normally Open
      * Relay output max switching voltage:30V
      * Rated current:1A
  * 34-pin female breakout allowing direct access to signal pins
  * Uses the myRIO Expansion Port(MXP) connector

**Connector Pin-outs**

__Relay connectors__ :
^ Signal ^ Description ^
| NOx | Normal Open |
| NCx | Normal Close |
| COMx | Common terminal |

__Open Drains__ :
^ Signal ^ Description ^
| ODx- | Open Drain negative terminal |
| ODx+ , PWR+ | Supply voltage (internally connected) |
| PWR- | Ground |

**Using the Adapter with myRIO**

***Relays*** are single side stable Normal Connected between NC and COM terminals. A logic "high" will energize the coil and the COM will be shorted to NO.

***Open Drains*** connectors are meant to be used with two polarized pins/channel. The OD+ is connected to PWR positive power terminal. The OD- is equipped with transient suppression diodes to the PWR. Connect open drains power supply(+PWR-) respecting the polarity. PWR should not exceed 16VDC.

Note:If you need different supplies for different channels, assure suppression diodes to your supply voltages, especially when use inductive loads.