Operation: External User I/O
============================

.. _user-io:

.. figure:: /_common-all/_images/connector-db15.eps
    :target: _images/connector-db15.eps
    :width: 500px
    :align: center

    |product_full| D-Sub 15-pin BDx Interface user I/O connector (female) pin numbering

.. csv-table:: Complete pin listing and definitions available on the BDx Module D-Sub 15-pin external user I/O connector. Pins not listed have no connection.
   :file: _tables/operation-userio-pins.csv
   :header-rows: 1
   :widths: 10 15 15 60

.. _bdx-digital-outputs:

Digital Outputs
---------------

The |product_full| has eight digital output signals on its rear 15-pint D-Sub external user I/O. The External User I/O pin layout is defined in :ref:`user-io`. 

The digital outputs are used to monitor the |product_type|'s internal states. Digita output pins will output +5V when the associated state is active and 0V when the state is inactive. The maximum output current per pin is 20 mA. 

When the |product_full| is in a normal operating state, INTERLOCK (Pin 5) will output +5V with respect to GROUND (Pin 7).

When the |product_full| is in a faulted state, INTERLOCK (Pin 5) will output 0V. 

INTERLOCK (Pin 5) is often used to tie in to existing interlock systems and is provided with an ORing diode for protection. 

.. _userio-references:

Grounds
-------

A ground pin is provided on the |product_full| 15-pin external user I/O connector on Pin 7 to be used as the reference ground for digital outputs.