Campbell Scientific IRGASON Integrated CO2/H2O Open-Path Gas Analyzer and 3D Sonic Anemometer - Manual (Page 27)

IRGASON ® Integrated CO
2
/H
2
O Open-Path Gas Analyzer and 3D Sonic Anemometer
any integer value between 0 and 14. The value 15 is reserved as an SDM-group
trigger.
7.4 Unprompted Output
If the EC100 is to output data as USB or RS-485 (see Section 8.2, USB or
RS-485 Output), this setting must be set to USB Port or RS485, respectively.
The factory default is to disable the unprompted output and assume data are to
be logged via SDM (see Section 8.1, SDM Output).
Only one unprompted-output type (i.e., USB or RS-485) may be selected at a
given time. The rate at which the EC100 outputs these data is determined by
the Unprompted Output Rate setting.
7.5 Unprompted Output Rate
This setting determines the output rate for unprompted output (USB or RS-485;
see Section 8.2, USB or RS-485 Output). If the unprompted output is disabled,
this parameter is not used. The factory-default output rate is 10 Hz, but it may
be set to 10, 25, or 50 Hz.
7.6 RS-485 Baud Rate
If the unprompted output mode is set to RS-485, this parameter determines the
baud rate. Otherwise, this setting is not used. The RS-485 baud rate defaults
to 115200 bps, although the user may enter another value.
7.7 Analog Output
The EC100 has two analog outputs for CO
2
and H
2
O densities (see Section 8.3,
Analog Outputs, for more information). These outputs may be enabled or
disabled with this setting. The default is for analog output to be disabled. Note
that the analog output does not include sonic data.
7.8 ECMon Update Rate
This setting determines the rate at which data are sent over the USB connection
to the PC while running ECMon. The default setting of 10 Hz should be
adequate in most situations.
7.9 Temperature Sensor
This setting configures the EC100 electronics to integrate with the IRGASON.
The IRGASON measures ambient air temperature using a thermistor
temperature sensor. With Auto-Select selected, the EC100 will detect that the
IRGASON is connected and will report ambient air temperature measurements
from the thermistor.
To diagnose problems with the temperature measurement, a fixed temperature
value may be used, or the temperature sensor may be selected manually.
7.10 Fixed Temperature Value
If the Temperature Sensor setting is None, the IRGASON will use the value
of this setting for the sample temperature. This mode is intended for
troubleshooting only. In normal operation, Temperature Sensor is set to
Auto-Select, and this setting is not used.
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