Teledyne 9110T - Nitrogen Oxides Analyzer - Manual (Page 152)

Model 9110T NOx Analyzer Communications Setup and Operation
Teledyne Analytical Instruments 152
present no problems, but you should be aware of it and not issue
commands to the instrument too frequently.
6.7.2.2. ACTIVATING HESSEN PROTOCOL
Once the COMM port has been properly configured, the next step in configuring the 9110T in order to
operate over a Hessen protocol network is to activate the Hessen mode for COMM ports and configure
the communication parameters for the port(s) appropriately.
To activate the Hessen Protocol, press: