def creditReqResp( self ):
    """Get/set the Credit Request / Credit Response value (USHORT).

    Errors:
      AssertionError  - Thrown if the assigned value (after conversion
                        to an <int>) is either negative or greater
                        than 0xFFFF.
      [ TypeError,    - Either of these may be thrown if the assigned
        ValueError ]    value cannot be converted into an <int>.

    ToDo: Document how and when this is used; references.
          The credit management subsystem needs study.
    """
    return( self._creditReqResp )