Sequoia LISST-200X, Руководство пользователя

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LISST-
200X User’s Manual
57 LISST-200X Operation Details
B.
Start and Stop Conditions
Overview The LISST-200X can be set up to start and stop data collection
according to various conditions. The most obvious is the white switch
lever on the connector end cap. However, the switch is only one of
several options. The start condition and stop condition can be different
from each other. Also see Configuring Data Collection on page 32.
Start Conditions The five possible start conditions are:
1. Depth,
2. Time,
3. External Mechanical Switch,
4. External Digital Input, and
5. Time Delay.
The details of each are described below. Note that regardless of which
start condition is selected, the LISST-200X will not start checking for
the start condition until the sample program is run from the Windows
software (see page 32), by the GO command (see Acquisition/Action
commands on page 69), or by automatic start after power-up.
Depth Start The LISST-200X checks its depth every 3 seconds. Each time it
checks, the green LED on the end cap will double-flash. If the depth
exceeds the threshold, the program will start data collection. When
setting the threshold, remember that atmospheric pressure,
temperature, and even the orientation of the LISST-200X can affect the
offset of the pressure sensor. Therefore, it is best to zero the sensor
(see page 32) immediately before starting, and to set the threshold to at
least 1 meter, to avoid incorrect triggering.
Time Start The LISST-200X will go into lower-power sleep until the programmed
time. (If the programmed time has already passed, it will start
immediately.) While waiting, it will quickly flash the LED once every 30
seconds.
External
Mechanical
Switch Start The LISST-200X will wait until the white plastic lever on its endcap is
moved to the “1” position. (If it is already in that position, it will start
immediately.) While waiting, it will quickly flash the LED twice every few
seconds.
External Digital
Input Start If the auxiliary connector is configured for analog and digital inputs (see
Appendix E: Connectors), pin 2 of the 6-pin connector is the digital
input. The program will check the status of the digital input once a
second. If the digital input is greater than 2 volts (relative to digital
ground, pin1), data collection will start. While waiting, the LED will
quickly flash twice every few seconds.
Time Delay Start The time delay start condition will cause the program to wait the
specified number of minutes. While waiting it will quickly flash the LED
once every 30 seconds.