Casio 2456 User Manual
USER’S GUIDE 2456
General Guide
• Press C to change from mode to mode. After you perform an operation in
any mode, pressing C returns to the Timekeeping Mode.
• In any mode, press L to illuminate the display for about two seconds.
Timekeeping Mode
Press C.
Alarm Mode
▲
▲
Day Counter
Mode
Stopwatch Mode
World Time Mode
▲
▲
Telememo Mode
▲
Timekeeping
Use the Timekeeping Mode to set and view the current time and date. You can
also display the Last Signal and World Time screens.
Last Signal Timekeeping World Time
Receive date
Press D.
Receive time
• The Last Signal screen shows the time and date of the last successful time
calibration signal reception.
• The World Time screen shows the data you were viewing when you last
exited the World Time Mode.
Current Time Setting
Normally, you do not need to do anything to set the current time as long as you
are within an area in West Europe where the watch can pick up the time
calibration signal. You can also set the current time manually when you are
outside the range of the signal.
• Before using the watch after purchasing it, use the procedure under
“Selecting Your Home City Code” (page E-11) to specify your home city, and
then use the procedure under “To perform manual time calibration signal
reception.”
• Note that after you set your Home City code, you must also turn on the
watch’s time calibration signal receiver if you want to enable auto time
calibration. See “About Auto Receive” (page E-16) for more information.
• See “Setting the Time and Date Manually” for information about manual
settings.
Setting the Time and Date Manually
The times displayed in the Timekeeping Mode and World Time Mode are
linked. Even if you plan to use the watch without enabling auto time calibration,
be sure to select a Home City code (the city code whose time and date you are
setting), before you set the time and date.
To set the current time and date manually
12-hour format indicator
City code
Receive indicator
Day of week
▲
▲
Hour : Minutes
PM indicator Seconds
1.In the Timekeeping Mode, hold down A until the
current Auto Receive On/Off setting starts to flash,
which indicates the setting screen.
2.Press C to move the flashing in the sequence
shown below to select other settings.
Month – Day
Hold down B.
▲
Release
Timekeeping Mode time
City code
Current time in the
selected city code
▲
Selecting Your Home City Code
You can select a city code for your Home City (the city where you normally use
the watch). This data can be changed any time you move to another
geographic area.
• See “City Code Table” at the back of this manual for a complete list of
available codes.
To select your Home City code
City code
Time Calibration Signal Reception
This watch is designed to pick up a time calibration signal transmitted from
Mainflingen, Germany and update its time setting in accordance with the
signal. There are two different methods you can use to receive the signal: Auto
Receive and Manual Receive. With Auto Receive, the watch automatically
receives the calibration signal three times each day and makes appropriate
adjustments. With Manual Receive, you perform a specific button operation to
receive the calibration signal.
Note
• If you are using the time calibration signal to set the time for this watch, be
sure to correctly set your home city. Otherwise, there is the chance that the
watch will not set the correct time. See the “To select your Home City code”
for details.
• This watch automatically switches between DST and standard time while
BER is selected as the home city code. For any other home city code, you
must perform the procedure under “To set the current time and date
manually” to switch between DST and standard time.
• Time calibration reception is limited to specific geographic areas in West
Europe.
• The current time setting in accordance with the time calibration signal takes
priority over any time settings you make.
• The watch is designed to automatically update the date and day of the week
for the period January 1, 2000 to December 31, 2039. Setting of the date by
the time calibration signal cannot be performed starting from January 1,
2040.
• This watch can receive signals that differentiate between leap years and non-
leap years.
• Auto Receive is turned on when the watch is shipped from the factory.
• See the information under “Time Calibration Signal Reception Precautions”
(page
E-42) if you experience problems with time calibration signal reception.
1.In the Timekeeping Mode, hold down A until the
current Auto Receive On/Off setting starts to flash,
which indicates the setting screen.
2.Press C three times to move the flashing to the
City Code setting.
3.Use D (+) and B (–) to change it.
4.Press A to exit the setting screen.
Auto
Receive
Day
3. When the setting you want to change is flashing, use B and/or D to
change it as described below.
Setting
Auto Receive
DST
12/24-Hour format
City Code
Setting
Seconds
Hour, Minutes,
Year, Month, Day
• Auto Receive setting is used for time calibration signal reception only. See
“About Auto Receive” for details.
• See “City Code Table” at the back of this manual for a complete list of
available codes.
• Daylight Saving Time (DST) advances the time setting by one hour from
Standard Time. Remember that no all countries or even local areas use
Daylight Saving Time.
4. Press A to exit the setting screen.
Month Year
Press D to toggle auto receive on and off.
Press D to toggle between Daylight Saving TIme (ON)
and standard time (OFF).
Press D to toggle between 12-hour (12H) and 24-hour
(24H) timekeeping.
Use D (+) and B (–) to change the setting.
Press D to reset to 00.
Use D (+) and B (–) to change the setting.
12/24-Hour
Format
Button Operations
Button Operations
City Code
Minutes
SecondsDST
Hour
To perform manual time calibration signal reception
Current time
Receive indicator
1.Place the watch on a stable surface to its top (12
o’clock side) is facing in the general direction of
Frankfurt, Germany.
• This puts the watch in the optimum position for
time calibration signal reception.
2.In the Timekeeping Mode, hold down D for about
two seconds, until the watch beeps.
• At this time, the indicator on the watch’s
display should scroll from left to right, which
indicates that signal reception has started.
• Time calibration signal reception takes from four
to 11 minutes. Take care that you do not move
the watch during this time.
• After signal reception is complete, the display of
the watch changes to the Last Signal screen,
which shows the new signal receive date and
time.
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USER’S GUIDE 2456
Note
• To interrupt a receive operation and return to the Timekeeping screen, press
D.
• If the receive operation is unsuccessful, the message “ERR” appears on the
Last Signal screen for about one or two minutes. After that, the watch returns
to the Timekeeping screen.
• You can also change from the Last Signal screen to the Timekeeping screen
by pressing D.
About the Receive Indicator
The receive indicator shows the strength of the calibration signal being
received. For best reception, be sure to keep the watch in a location where
signal strength is strongest.
Weak Strong
• Even in an area where signal strength is strong, it takes about 10 seconds for
signal reception to stabilize enough for the receive indicator to indicate signal
strength.
• Use the receive indicator as a guide for checking signal strength and for
finding the best location for the watch during signal receive operations.
• The receive indicator remains on the display in all modes following reception
of the time calibration signal and calibration of the watch’s time setting. The
receive indicator does not appear if signal reception was unsuccessful or
after manual adjustment of the current time setting.
About Auto Receive
When auto receive is turned on, the watch automatically starts to receive the
time calibration signal when the digital time in the Timekeeping Mode reaches
2:00 AM, 4:00 AM, and 6:00 AM each day (calibration times).
Note
• The Auto Receive operation is performed only if the watch is in the
Timekeeping Mode or World Time Mode when one of the calibration times is
reached. It is not performed if the calibration time is reached while you are
making settings (while settings are flashing on the display).
• Auto receipt of the calibration signal is designed to be performed early in the
morning, while you sleep (provided that the digital time is set correctly).
Before going to bed for the night, remove the watch from your wrist, and put it
in a location where it can easily receive the signal.
• The receive indicator ( ) indicates that one, two, or all three of the last
calibration time reception attempts were successful.
• When auto receive is turned on, the watch receives the calibration signal for
four to 11 minutes each day when the digital time reaches 2:00 AM, 4:00 AM,
and 6:00 AM. Do not operate any of the watch’s buttons within 15 minutes
prior to or following the calibration times. Doing so can interfere with correct
calibration.
• Remember that reception of the calibration signal depends on the time
shown on the digital display. The receive operation will be performed
whenever the digital display shows 2:00 AM, 4:00 AM, and 6:00 AM,
regardless of whether or not the displayed time is actually the correct time.
• When two or three receptions are successful, the watch uses the data of the
last reception for calibration. When only one reception is successful, the
watch uses the data of the successful reception.
To turn auto receive on and off
1.In the Timekeeping Mode, hold down A until the
current Auto Receive On/Off setting starts to flash,
which indicates the setting screen.
2.Press D to toggle Auto Receive on (ON) and off
(OFF).
3.Press A to exit the setting screen.
Alarms
Alarm time
Alarm number
Remaining time (Hours :
Minutes Seconds)
To view Alarm Mode screen
In the Alarm Mode, use B and D to cycle through the alarm screens as
shown below.
Press D.
Press B.
• Displaying an alarm time shows any text assigned to it for about two seconds
(or a blank screen if no text is assigned), followed by the remaining time
screen.
• Your watch comes preset with the text data “LUNCH” and an alarm time of
12:00PM (noon) for alarm AL1. You can use this setting as it is or change it
to something else.
To set an alarm
Cursor
• There are eight spaces in the text, so you have to press C eight times to
move to the Hour setting.
4.
When the setting you want to change is selected, use B and D to change it.
• Selecting the text causes the text input cursor to appear.
• When inputting text, use B and D to cycle through characters at the
current cursor location, and C to move the cursor to the right. See
“Inputting Text” on page E-39.
• While the hour or minute setting is flashing, use D (+) and B (–) to
change it.
• When setting the alarm time using the 12-hour format, take care to set the
time correctly as a.m. (no indicator) or p.m. (P indicator).
5. Press A to exit the setting screen.
Note
• Use the above procedure to edit alarm settings, too.
You can set three independent Daily Alarms, and
even input text that appears on the display to remind
you of the purpose of each alarm. When an alarm is
turned on, the alarm tone sounds when the alarm
time is reached. You can also turn on an Hourly Time
Text
Signal that causes the watch to beep twice every
hour on the hour.
• The remaining time shows the amount of time from
the current time (Timekeeping Mode time) until the
alarm time whose screen is on the display.
• The alarm number (“AL1” though “AL3”) indicates
an alarm screen. “SIG” appears in place of the
alarm number when the Hourly Time Signal screen
is shown.
• All of the operations in this section are performed in
the Alarm Mode, which you enter by pressing C
(page
E-4).
AL1 AL2 AL3 SIG
1.In the Alarm Mode, use B and D to select the
alarm whose time you want to set.
2.Hold down A until the flashing cursor appears on
the display, which indicates the setting screen.
• This automatically turns on the alarm.
• Holding down L for about two seconds at this
time sets an alarm time of 12:00AM, without
assigning any text to the alarm.
3.Press C to move the flashing in the sequence
shown below to select other settings.
HourText
Minutes
Alarm Operation
The alarm sounds at the preset time for about 20 seconds, or until you stop it
by pressing any button.
• Alarms and the Hourly Time Signal sound in all modes. To view text assigned
to alarms and the remaining time, however, you must enter the Alarm Mode.
To test the alarm
In the Alarm Mode, hold down D to sound the alarm.
To turn an alarm and the Hourly Time Signal on and off
1. In the Alarm Mode, use B and D to select an alarm or the Hourly Time
Signal.
2. When the alarm or the Hourly Time Signal you want to is selected, press A
to turn it on and off.
Note
• The on/off status of an alarm is indicated on the corresponding alarm screen
(AL1 through AL3). The symbol indicates an alarm is turned on, while
absence of the symbol indicates the alarm is turned off.
• The on/off status of the Hourly Time Signal is indicated on the SIG screen.
The symbol along with the message “ON” indicates the Hourly Time Signal
is turned on, while the message “OFF” without the symbol indicates it is
turned off.
• The alarm on indicator and the Hourly Time Signal on indicator are shown on
the display in all modes while these functions are turned on.
• If any alarm is on, the alarm on indicator is shown on the display in all
modes.
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