Document change log

Updates, changes and additions to this guide are listed by the date the document was released.

July 27, 2022

Minor updates to “Limits imposed by the Modbus licenses” topic.

February 9, 2021

Many minor edits throughout.

December 15, 2019

Document reorganized to emphasize tasks with reference material moved to the end of the document. This document has been updated for Niagara 4.9 and later.

August 25, 2010

Expanded the Preface and legal text. Added details about client Modbus Enum Bits and Numeric Bits proxy points. Added details about a client component to read function code 07 (exception status).

February 14, 2008

Added references to the Drivers Guide.

March 15, 2007

Completely reworked what was formerly a placeholder document providing new main chapters, numerous content changes, and summary descriptions. Also added terms.

June 24, 2005

Initial document publication.