What is the difference between ISOBUS VT Version 3 and Version 4?

VIRTEC display.
VIRTEC display.

The ISO 11783-6 standard was most recently released in 2010. As of this release, three common versions of the Virtual Terminal (VT) are specified. These versions are referenced in the standard as “Version 2”, “Version 3”, and “Version 4”. Based on recent ISOBUS Plugfest attendance, a survey of the industry shows a few Version 2 devices still in common use, a small number of Version 4 devices in use, and a large majority of devices using Version 3. The standard requires that an Electronic Control Unit (ECU) and a VT communicating via the VT standard should use the standard according to the lowest VT version of the pair, e.g. a VT at Version 4 and an ECU at Version 3 should use Version 3 communications.

In a discussion regarding a new VT design, we strongly recommend against using VT Version 2. The differences between VT Version 2 and VT Version 3 are only significant in one key area: Aux Control. The Aux Type 2 is defined for Version 3 and later and is not compatible with Aux Type 1 in Version 2 and prior. Aux Type 1 and Aux Type 2 are incompatible, so we recommend making the choice to use Aux Type 2.

Differences between VT Version 3 and VT Version 4 can be broken down into 4 categories:
1. Clarifications and incremental improvements;
2. Modifications to requirements;
3. New optional features; and
4. New required features.

For a full list of these differences, read more here: https://www.distek.com/about/isobus-vt/

About Benjamin Jefferson

Benjamin Jefferson, Vice President of Technology Development, has been with the company since 2006. His 15+year career has focused on software development for embedded electronics in the mobile off-highway equipment industry. He started with DISTek as a Software Engineer focused on electrohydraulic control systems for agricultural vehicles and implements. While with DISTek, he has managed embedded software development projects and teams, has worked with the business development team, and is active with the executive management team. Benjamin’s technical expertise includes C, C++, CAN, ISOBUS, SAE J1939, MATLAB/Simulink, and Digital Signal Processing.

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