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© Servomex Group Limited. 2020
07931001B revision 6
As shown in the diagram, communication between the Laser 3 Plus and the HMI is
via Modbus TCP. There is a two-way flow of data between the Laser 3 Plus and the
HMI.
Examples of data going from the HMI to the Laser 3 Plus would include:
•
User settable parameters
•
The command to start auto val
Examples of data going from the Laser 3 Plus to the HMI would include:
•
The required state of the zero and span-gas valves
•
Zero and span measurements
•
Fault indicators
•
The state of the auto val process
•
The auto val pass/fail result
Note that although there is a two-way flow of data over Modbus TCP between the
Laser 3 Plus and the HMI, the Laser 3 Plus is a Modbus slave. The HMI must
assume the role of Modbus master. All Modbus TCP transactions must be initiated
by the Modbus master. This means that if the HMI requires data from the Laser 3
Plus, it must ask for it. The Laser 3 Plus as the slave cannot initiate a transaction by
itself.
Measurement Stability
There is an important difference between manual validation and auto validation.
During manual validation, if the measurement is found to be outside the user defined
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