Grecom PSR-410 Owner's Manual page 55

Temporary lockout is a very useful feature. For example, when a major
incident occurs while you are scanning, you may wish to focus your
scanning on that major incident, and exclude unrelated talkgroups so that
radio traffic associated with the major incident is not interrupted.
You could press the PAUSE or MAN keys to listen to a single object, if
communications for the major incident are only being conducted on single
channel or talkgroup. More often, several talkgroups are used to provide
communications for major incidents, so if you park on a single object, you
may miss communications on other objects that are related to the incident
of interest.
By using Temporary Lockout, it is possible to "zoom in" on the objects that
are carrying communications related to the incident of interest by pressing
L/OUT every time an unrelated object becomes active. Eventually you
will narrow down your monitoring to those objects that are being used to
provide communications for the incident you are trying to monitor.
Permanent Lockout
Permanent lockout locks out an object until you explicitly unlock it. No
traffic will be received on the locked out object while permanent lockout is
active.
To apply permanent lockout to an object, press FUNC, then the L/OUT
key while the scanner is stopped on that object during scan operation, or
navigate to an object using the 5-way pushbutton pad while in Manual Mode
or Program mode and press FUNC, then the L/OUT key. The lowercase " l "
in the display changes to uppercase to indicate that permanent lockout is
applied to the object:
If you wish to remove permanent lockout from an object, navigate to the
object using the 5-way pushbutton pad while in Manual Mode or Program
mode and press FUNC, then L/OUT again.
HINT: You can also toggle lockout anytime you are viewing an object menu
in Program mode by pressing L/OUT.
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