def command_field_response(request)
      case request
        when C_STORE_RQ
          return C_STORE_RSP
        when C_ECHO_RQ
          return C_ECHO_RSP
        else
          logger.error("Unknown or unsupported request (#{request}) encountered.")
          return C_CANCEL_RQ
      end
    end
def command_field_response(request)
      case request
        when C_STORE_RQ
          return C_STORE_RSP
        when C_ECHO_RQ
          return C_ECHO_RSP
        else
          logger.error("Unknown or unsupported request (#{request}) encountered.")
          return C_CANCEL_RQ
      end
    end
Returns the appropriate response value for the Command Field (0000,0100) to be used in a command fragment (response).

 === Parameters

 * <tt>request</tt> -- The Command Field value in a command fragment (request).