YSI WaterLog Series, Owner'S Manual

Page: 96 / 174

Digital Out
The Digital I/O Ports are located on the lower first block of the front panel.
Digital ports can be configured as either Inputs or Outputs and will automatically be configured
based on how the System 5000
is set up. If a pin is configured as a Digital Out, the value will
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be a 1 or a 0 based on whether the Condition evaluates as a true (greater than zero) or false, “On”
or “Off” respectively. Logical Conditions, such as HG > 0, are suggested, as they return a simple
true or false response. Calculations that return a positive or negative number are also allowed,
evaluating any positive number as true and zero or less as false.
Be aware that though the Digital Output may be set to a 1 or a 0, the connected equipment may
prevent the Output from going to the desired state if it is causing too great a load on the output.
In this case the reported value matches the desired state and not the actual state.
If the Conditional Type is unchecked, the Output will always be run (as though the Condition
statement evaluated to true). The Digital Port will simply be set to 1 (High) when the Task
Output is run in this manner. The On For Scan Mode, described below, operates regardless of
the Conditional statement.
Port: Defines which port is currently being measured and will be used as the Task Value.
6-38 Outputs
System 5000
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