Teledyne 9110T - Nitrogen Oxides Analyzer - Manual (Page 153)

Model 9110TH NOx Analyzer Communications Setup and Operation
Teledyne Analytical Instruments 153
6.7.2.3. Selecting a Hessen Protocol Type
Currently there are two versions of Hessen Protocol in use. The original implementation, referred to as
TYPE 1, and a more recently released version, TYPE 2 that has more flexibility when operating with
instruments that can measure more than one type of gas. For more specific information about the
difference between TYPE 1 and TYPE 2 download the Manual Addendum for Hessen Protocol from
the Teledyne API's web site: http://www.teledyne-api.com/manuals/.