Mission Critical xantrex Freedom SW 3012, Manual

Page: 33 / 48

Introduction
976-0452-01-01 33
3 PROPRIETARY
MESSAGES
Introduction 33
Proprietary DGN General Framework 34
DGN Messages 35
Examples of Proprietary_Message_Request 43
Introduction
Freedom SW-RVC has additional features which are currently not
supported by standard RV-C DGNs. This section describes these
proprietary messages.
Implementation of the Proprietary Messages uses the first 5 bytes
of the ADDRESS_CLAIM field (described in section 3.3.3 of the
RV-C Specification) of both source and destination devices to
calculate the CRC (Cyclic Redundancy Check ) used in the
validation of the Proprietary Messages. The CRC is calculated
using the the first 5 bytes of the ADDRESS_CLAIM field of the
destination followed by the Proprietary Message data bytes and
the first 5 bytes of the ADDRESS_CLAIM field of the source
device and appended after the end of the Proprietary Message
data bytes (it is not in a fixed position, its position depends on the
number of bytes in the individual Proprietary Message).
See an example of calculating the CRC and creating a Proprietary
Message
on page 43 .