Thermo Scientific Omni FTIR Multi Gas CEMS Instruction Manual page 63

Operation
Data Server Software
First, the 'Add' button can be used to select the directory that contains the
concentration data files that are to be used as the Modbus data source. The
Modbus program will transmit data from the last line in the newest file in
that directory when it receives a command to transmit data from the
Modbus master. It is necessary that a data file already exists in order to be
able to perform this step. Click the down arrow in the compound field to
select a parameter to be transmitted. Click the down arrow in the file type
field to select the file extension (e.g., con, cav, cor, cnc). Enter the ADU
register number in the register field.
In the configuration frame Refresh Interval (ms) sets the time period at
which the program will update the Modbus registers from the
concentration file data. The nominal value is 10000 ms. The Settings
button can be used to configure the COM port associated with the
Modbus network for serial Modbus.
Thermo Fisher Scientific Omni FTIR Multi Gas CEMS Instruction Manual 3-17