Connecting Modbus and LonWorks Networks - FieldServer ...
Connecting Modbus and LonWorks Networks - FieldServer ...
Connecting Modbus and LonWorks Networks - FieldServer ...
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Translation ChallengesEngineering UnitsTHE CHALLENGE‣ <strong>Modbus</strong> is a simple protocol that transfers raw data <strong>and</strong>applies no significance to any of the values transferred.‣ Significance is achieved through documentation of the<strong>Modbus</strong> registers in the vendor documentation‣ <strong>LonWorks</strong> is obsessive about applying significance tovalues transferred. All SNVT Types inherently possess anEngineering unit, data resolution <strong>and</strong> data range.‣ All Engineering units in <strong>LonWorks</strong> are SI (Metric). This isnot obvious to most <strong>LonWorks</strong> users as applications suchas LonMaker will automatically scale the values to Imperialformat in the USA.‣ The challenge is matching up the values’ Engineering unitsused in <strong>Modbus</strong> with the SI Engineering Unit specified in<strong>LonWorks</strong>
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