LISST-200X User’s Manual LISST-200X Operation Details Page 72
The LISST-SOP software or two letter commands can configure the
LISST-200X with one of five Start conditions:
1. Depth,
2. Time,
3. External Mechanical Switch,
4. External Digital Input, and
5. Time Delay.
The details of each condition are described below.
The built-in depth sensor of the LISST-200X is used to check the
current depth to determine if the desired start depth has been
exceeded. The instrument is powered up and 5 measurements of the
depth are averaged over a two-second period. If the depth exceeds the
threshold the program will proceed to the data collection routine. If the
depth does not exceed the threshold the instrument will power down
and wait 28 seconds before checking the depth again. The program
will continue checking until the depth is exceeded or until the program
is stopped.
The program will check the current time every second and compare it
to the Start Time. If the Start Time is equal to or earlier than the current
time the program will go directly to the data collection routine. It will
continue checking the time until the Start Time is reached or until the
program is stopped.
External
Mechanical
Switch Start
The LISST-200X has a white plastic lever on the endcap. This lever
has a magnet imbedded in it. This magnet can activate a switch inside
the pressure case. The base program looks at the status of this switch
once a second. If the switch is in the on or “1” positions the program
will go directly to the data collection routine. It will continue checking
the switch status until the switch is moved to the “0” position or until the
program is stopped. When in the “0” position the lever is up against the
zinc anode.
External Digital
Input Start
If the auxiliary connector is configured for analog and digital inputs (see
Appendix E: Connector Pinouts for LISST-200X), 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) the program will go directly to the data
collection routine. It will continue checking the status of the digital input
until voltage drops below 0.7 volts or until the program is stopped.
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