Sequoia LISST-200X, Руководство пользователя

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LISST-
200X User’s Manual
55 LISST-200X Operation Details
14.
Collecting Data from an External Analog Sensor
The LISST-200X can supply regulated 12V power to an external sensor, and measure one
to three analog voltages, depending on its hardware configuration and firmware settings. If
the 12V power output is activated, it will turn on each time the 200X collects a sample or
burst of samples, and turn off each time the 200X goes into a waiting state of more than a
few seconds. If using the 12V output, you can specify how long it should turn on before
sampling, as a warmup time for the sensor.
To provide these functions, the auxiliary connector on the LISST-200X must be in one of
three configurations: Analog & Digital Input (which provides a single analog input), Dual
Analog Input configuration (which provides two), or Triple Analog Input configuration (which
provides three).
Remember that power consumed by an external sensor will reduce battery endurance, in a
battery-powered deployment. It might also exceed the capacity of the USB-powered data
cable. If so, you can augm
ent the USB cable’s power by connecting the large battery
housing.
STEP ACTION RESULT
1
•
Determine current configuration of Auxiliary connector: in
LISST-200X Software, open the instrument status bar. Look
for the Endcap Configuration. If it is not one of the analog-
input configurations, it must be changed; contact Sequoia
for assistance.
Auxiliary
Connector
configuration
determined
2
•
Make the appropriate connections between the 6-pin
auxiliary connector of the LISST-200X and your sensor. To
see the pin assignments, type the CONFIG command in the
LISST-200X terminal window; page 61). Or see Appendix E:
Connectors on page 84.
External sensor
connected
3
•
Type SENSORPOWER into the terminal window, and
respond to its prompt to select the appropriate option.
•
Type SENSORWARM in the terminal window to set a
warmup time (in seconds).
•
WARNING: a USB cable may not provide enough power
for external sensors
. Use a battery housing or other power
source to provide enough power to run external sensors.
Configured for
analog collection
4
•
Set the standard sampling parameters to control the
sampling schedule and other options (see
•
Configuring Data Collection on page 32).
Ready to collect
data