6-11SectionSystem Maintenance
150
Item Meaning
PT Notification Area Word at the host to which the PT Status Notify Area is allo-
cated
Window Control
Area
Word at the host to which the Window Control Area is allo-
cated
Display Contents of the Second Screen
Item Meaning
Numeric Expression Default for the method of interpretation of the contents of
host words to which numeral memory table entries are allo-
cated (numeric value storage method).
Expansion I/F Type of Unit installed at the expansion interface connector
Compatibility Sets whether or not to use NT20S compatible mode for
screen data. (Sets whether to operate as a normal NT21 or
emulate many key NT20S characteristics.)
Display Contents of the Third Screen
Item Meaning
Comm. Port A Communication type set for serial port A (fixed as RS-232C)
Comm. Method Communication method set for serial port A
Comm. Setting Communication conditions set for serial port A (display con-
tents differ according to the communication method)
Display Contents of the Fourth Screen
Item Meaning
Comm. Port B Communication type set for serial port B
Comm. Method Communication method set for serial port B
Comm. Setting Communication settings set for serial port B (display con-
tents differ according to the communication method)
6-11-3 Displaying the Display History Record
The
display history record function is a function that records the order of display
of each screen during operation, and the number of times each screen is dis-
played.
Only the screens for which the display history screen attribute has been
set in advance are processed by this function.
The record data can be displayed using an operation from the System Menu.
This
section explains how to display the display history record data recorded in
the NT21.
Note
that there are
two display methods: sort by occurrence (display time order)
and sort by frequency (order of number of times displayed).
Reference: S Install an optional battery in the NT21 when using the display history record
function.
S When a battery is not installed or the battery fails, the contents of the
history
record will be unpredictable when the NT21 is turned OFF and will be initial-
ized.
S Time
stamps will be recorded with the history records using clock data read
by
the NT21 from the host. If the clock data is incorrect, spaces will be stored
instead of the data.
S With the NT21, the record data can also be displayed by calling screen No.
9001 (sort by occurrence) or screen No. 9002 (sort by frequency) during the
RUN mode.
S For
details on the display history record function, refer to
2-15-1 Display Histo
-
ry Record Function in the Reference Manual.
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