On Tuesday 14th May 2019 at Lingley Mere Business Park near Warrington, WITS held another WITS Protocol plugfest. The event was kindly hosted by Jim Blower of United Utilities. This plugfest followed the October 2018 plugfest which was hosted by Russ Wheedon of Thames Water; you can read more on that plugfest here. In a similar fashion to the October meeting, a WITS User Meeting was planned for Wednesday 15th May, the day after, allowing users to attend both meetings easily. User attendees at the plugfest included Northern Ireland Water, Northumbrian Water, South West Water and United Utilities. In all, around 40 people (users and vendors) attended the plugfest day.

The day

Between around half eight and nine O’Clock on Tuesday morning, vendors started arriving at the Conference Centre in Hawsewater House at Lingley Mere to set up their equipment. As you can see from the photo above, we had a large room with a horseshoe of tables. Master Stations and Field Devices, along with their support equipment, were set up on those tables and connected together using an internal IP network. GPRS and 3G connectivity was provided by a cellular router connected to the same internal network. The day drew to a conclusion between four and five o’clock.

During this WITS Plugfest both the WITS-DNP3 and the WITS-IoT protocols were under test. WITS-IoT was released at 1.0 some time ago and this was the first opportunity to test elements of that version of the specification. For WITS-DNP3, regression tests were available for the vendors to run and where necessary they had the opportunity to test and solve known problems.

WITS-DNP3 testing

The following table lists the FD (Field Device) vendors who attended the day. As well as these FD vendors, both Master Station vendors also attended: Servelec Technologies with Scope (version 4.6, trunk revision 62232, expected to become the Quality Street release), and Schneider Electric with GeoSCADA Expert (the new name proposed for ClearSCADA) Beta 6.81.7068, capable of supporting up to WITS 3.0.

Vendor Device Device Version Highest WITS Version
Brodersen RTU32N




Metasphere Point Orange 3G V9.0c0022 1.1
Schneider Electric T4e A18.23 1.3
Softing WITS Gateway 1.3 Build 1 1.3
Technolog Cello 4B

Cello 4C

Logger 4.09, WITS Beta 1.1.63
Logger 4.09, WITS 1.1.62


The following picture shows a collage of the various devices present on the day.

Various WITS-DNP3 Field Devices from the Plugfest

Various WITS-DNP3 Field Devices from the Plugfest : Schneider T4e/T4e Mk II and T4c, Technolog Cello, Brodersen RTU32N, Softing WITS Gateway and Metasphere Point Orange.

WITS-IoT testing

Having released version 1.0 of the WITS-IoT Protocol Specification some time ago, vendors were encouraged to commence development of their Master Station and Field Device products for WITS-IoT. At this plugfest we held a parallel plugfest for WITS-IoT. Both Servelec and Schneider brought forward Master Station extensions which permitted WITS-IoT devices to appear on their normal Master Station databases. Both of these were in prototype stages of development. The plugfest brought together a number of fledgling/prototype Field Devices, these are listed in the table below:

Vendor Device Device Description
Churchill Controls Mega Bridge This device is in pilot production stage, it was successfully tested with the Servelec and Schneider Master Station extensions.
Halma Water Management WITS-IoT Gateway This software is a prototype at the moment, it was successfully tested with the Schneider Master Station extensions.
Northumbrian Water WITS-IoT Proof of Concept Device This device and its software is a proof of concept, it was successfully tested with the Schneider Master Station extensions.
Schneider Electric WITS-IoT Proof of Concept Device This device and its software is a proof of concept, it was successfully tested with the Schneider Master Station extensions.
Terzo Digital WITS-IoT Stack This software is a prototype at the moment, it was successfully tested with the Schneider Master Station extensions.

The following picture shows a collage of a couple devices under test; the Churchill Controls Mega Bridge and the Schneider Electric Prototype device (affectionately marked as T4a). A number of the prototypes were not demonstrable in they are not physical devices, such as Halma Water Management’s WITS-IoT Gateway and Terzo Digital’s WITS-IoT Stack. Note that all the products discussed are only prototypes at the moment.

A couple of the WITS-IoT prototypes on show during the Plugfest

What was interesting with the systems under test was the variation in types of Field Device under development. From:

  • straight Field Devices like Churchill Controls Mega Link;
  • to a gateway like Halma Water Management’s system which bridges native devices through their Datagate system to WITS-IoT Master Stations as if they were individual WITS-IoT devices;
  • to a reusable software stack like Terzo Digital’s WITS-IoT Stack which gives Field Device vendors a quick way to implement WITS-IoT on their devices.

Hopefully this is a trend which will continue as further devices are developed, prior to the next Plugfest.

The outcome

No new issues with WITS were raised on the day. Individual vendors may have discovered or worked on a fix for their own issues, but this was not recorded.

As found in the last plugfest, one of the main advantages of the day is to have the actual staff involved in the development of the WITS products from each vendor present in the same room at the same time. This means that failures in operation can be quickly found, analysed, and sometimes even fixed, within that session. This is something that would be much slower and more difficult outside the plugfest environment. As the Master Station licensing restrictions are also removed for the day, each of the Field Device vendors has unfettered access to the Master Stations, thus allowing them to test without worrying that the reason something does not work, is that licensing is preventing it.

What comes next?

The WITS PSAC is now trying to organise the next plugfest. This should also be accompanied by a user meeting at that time, in an attempt to ensure as many users as possible have a chance to attend the plugfest as well.

If you have any questions about the plugfest or would like to be involved in any future plugfests we organise, then please contact the secretary at

Mark Davison, Terzo Digital, June 2019