YSI IQ SensorNet 2020 XT Terminal - Manual (Page 144)

Settings/setup System 2020 XT USB
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Fig. 5-12 Edit list of sensors
5.8.2 Erasing an inactive dataset for an MIQ output module
An inactive dataset for an MIQ output module arises if the system
receives no signals from a registered MIQ output module. Inactive
datasets can be recognized by a question mark, e.g. "?01" in the Edit
list of outputs overview.
An inactive dataset can be reactivated by assigning it, e.g. to an
MIQ output module of the same type (see section 7.4.3). All settings
are retained. If you no longer require the stored data, you can erase
them.
1 Using , open the Settings menu.
2 Using < > and , select and confirm the menu
item, System settings -> Edit list of outputs.
The Edit list of outputs display opens.
3 Using <
>and , highlight the Model/Channel
column. Confirm with . This column can only be highlighted if
an inactive dataset (?xx) is present.
4 Press <
> to highlight a Model/Channel and confirm
with .