MultiSmart Installation & Operation Manual
40 Appendix E – Setting Up WITS-DNP Communications
Water Infrastructure Telemetry System – Distributed Network Protocol (WITS-DNP) is a system being
widely adopted by the UK water industry. The intention of this section is not to describe this system in
detail, but rather to describe how to set up a MultiSmart device for a WITS-DNP environment. Reference
should be made to the WITS Application Notes for a full description of the features and benefits of WITS-
DNP.
40.1 Basic Configuration
There is one main parameter which controls whether or not DNP3 communications will use WITS. Under
DnpSlave.Slave._1 is a parameter called Enable WITS? This parameter should be set to true.
WITS requires information to be saved within log files. Because of this, the format of log files changes
when WITS is enabled. When a device first restarts after having WITS enabled, existing log files will be
deleted. It is highly recommended that these log files be backed up first if they contain valuable
information.
Another important parameter is the WITS Version under DnpSlave.Slave._1. MultiSmart currently
supports up to incremental version 3. (Incremental version 3 equates with WITS 1.2. MultiSmart actually
supports WITS 2.0, but no changes to incremental configurations were made from WITS 1.2 to WITS 2.0,
and WITS 1.2 continues to describe the latest version for incremental configurations.)
When the WITS Version is set to Default, then the latest version is used. If a master station only supports
earlier versions of WITS, then there will be interoperability issues when incremental configurations are
returned to the master. In order to avoid these problems, the WITS Version should be configured to be at
the same level as the master. At the time of writing, WITS 1.1 is commonly supported by most master
stations with WITS functionality. To configure the MultiSmart for WITS 1.1, set the WITS Version
parameter to Version 2.
MultiSmart_IO_Manual_R20 Page 247 of 260
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