Casio 2556 User Manual Download Page 2

USER’S GUIDE 2556

2

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 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  or
World Time Mode when one of the calibration times is reached.
It is not performed if a calibration time is reached while you are making settings
(while settings are flashing on the display), while an alarm is sounding.

Auto receipt of the calibration signal is designed to be performed early in the
morning, while you sleep (provided that the Timekeeping Mode 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 either the 2:00 AM, 4:00 AM, or 6:00 AM
calibration signal reception was successful. Note, however, that the receive indicator
is cleared from the display at 3:00 AM each day.

If you do not see the receive indicator except for the above reason, it means there
was some problem with the calibration reception operation. Either perform reception
manually, or make sure the watch is set up properly to receive the time calibration
signal for the next automatic reception time.

Though this watch is designed to receive both time data (hour, minutes, seconds)
and date data (year, month, day), certain signal conditions can limit reception to time
data only.

The receive indicator (

) appears only when the watch is able to successfully

receive both time and date data. It does not appear when only time data is received.
When time and date data is received: Receive indicator (

) appears.

When time data only is received: Receive indicator (

) does not appear.

Normally, the signal reception date shown by the Last Signal screen is the date data
included in the received time calibration signal. When only time data is received,
however, the Last Signal screen shows date as kept in the Timekeeping Mode at the
time of signal reception.

When auto receive is turned on, the watch receives the calibration signal for two to
six minutes each day when the Timekeeping Mode time reaches 2:00 AM, 4:00 AM
and 6:00 AM. Do not operate any of the watch’s buttons within six 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 kept in the
Timekeeping Mode. The receive operation will be performed whenever the display
shows 2:00 AM, 4:00 AM and 6:00 AM, regardless of whether or not the
Timekeeping Mode 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 to flash, which
indicates the setting screen.

2. Press 

D

 to toggle auto receive on (

ON

ON

ON

ON

ON

) and off (

OF

OF

OF

OF

OF

).

3. Press 

A

 to exit the setting screen.

Setting the Time and Date Manually

Make sure you select your Home City code (the city code whose time and date you
are setting) before change the current time and date settings. World Time Mode times
are all displayed in accordance with the Timekeeping Mode settings. Because of this,
World Time Mode times will not be correct if you do not select the proper Home City
code before setting the time and date in the Timekeeping Mode.

To set the current time and date manually

1. In the Timekeeping Mode, hold down 

A

 until the

current auto receive on/off setting to flash, which
indicates the setting screen.

2. Press 

C

 to move the flashing in the sequence shown

below to select other settings.

Auto

Receive

Seconds

DST

Frequency

12/24-Hour 
Format

City Code

Month

Year

Minutes

Hour

Day

Screen

Setting

Auto Receive

Frequency

City code

Button Operations

Press 

D

 to toggle auto receive on and off.

When 

NYC

CHI

,

 DEN

,

 LAX

,

 ANC

, or 

HNL

is selected as Home City Code, 

USA

flashes. When one of the other city codes is
selected as Home City Code, 

--- 

flashes.

Use 

D

 (+) and 

B

 (–) to change the

setting.

3. When the setting you want to change is flashing, use 

B

 and/or 

D

 to change it as

described below.

Screen

Setting

DST

12/24-Hour format

Hour, Minutes

Seconds

Year

Month, Day

Button Operations

Press 

D

 to toggle between Daylight Saving

Time (

ON

ON

ON

ON

ON

) and standard time (

OF

OF

OF

OF

OF

).

 Pressing 

D

 performs a different operation

when 

NYC

CHI

DEN

LAX

ANC 

or 

HNL

is selected as Home City Code. See “Auto
Summer Time (DST) Switching”.

  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 the seconds to 

00

.

Use 

D

 (+) and 

B

 (–) to change the

setting.

4. Press 

A

 to exit the setting screen.

The auto receive setting is used for time calibration signal reception only. See “About
Auto Receive” for details.

See “City Code Table” for a complete list of available city codes.

Resetting the seconds to 

00

 while the current count is in the range of 30 to 59

causes the minutes to be increased by 1. In the range of 00 to 29, the seconds are
reset to 

00

 without changing the minutes.

Current time in the
selected city code
(Hour : Minutes Seconds)

City code

Home city time

World Time

The World Time shows the current time in 30 cities (29
time zones) around the world.

If the current time shown for a city is wrong, check your
Timekeeping Mode time and Home City settings and
make the necessary changes.

You can change the DST (Daylight Saving Time)/
Standard Time settings for each city code in the
Timekeeping Mode.

The watch will perform a signal receive operation even if
it is in the World Time Mode when a calibration time is
reached. If this happens, the World Time Mode time
settings will be adjusted in accordance with the
Timekeeping Mode’s Home City time.

All of the operations in this section are performed in the
World Time Mode, which you enter by pressing 

C

.

DST indicator

To view the time in another city code

In the World Time Mode, press 

D

 to scroll city codes (time zones) to the east or 

A

 to

scroll to the west.

For full information on city codes, see the “City Code Table”.

Alarms

The Alarm Mode gives you a choice of four one-time
alarms and one snooze alarm. One of the one-time
alarms functions as a “target alarm,” which counts the
time remaining from the current Timekeeping Mode time
to the target alarm time.
Also use the Alarm Mode to turn the Hourly Time Signal
(

SIG

) on and off.

There are five alarms numbered 

AL1

 through 

AL3

,

TAL

,and 

SNZ

. You can configure 

SNZ

 as a

snooze alarm only. Alarms 

AL1

 through 

TAL

(target alarm) can be used as one-time alarms only.

Alarm settings (and Hourly Time Signal settings) are
available in the Alarm Mode, which you enter by
pressing 

C

.

Alarm time (Hour : Minutes)

Home city time

Alarm number

Countdown
(Hours : Minutes Seconds)

Target alarm screen

To set an alarm time

1. In the Alarm Mode, use 

D

 to scroll through the alarm

screens until the one whose time you want to set is
displayed.

2. After you select an alarm, hold down 

A

 until the hour

setting of the alarm time starts to flash, which indicates
the setting screen.

This operation automatically turns on the alarm.

3. Use 

C

 to move the flashing in the sequence shown

below to select other settings.

Minutes

Hour

On/off status

AL1

AL2

AL3

SIG

SNZ

TAL

4. While a setting is flashing, use 

D

 and 

B

 to change it.

While the hour or minute setting is flashing, use 

D

(+) and 

B

 (–) to change it.

While a one-time alarm or the snooze on/off setting is
flashing, use 

D

 to toggle it on (

ON

) and off (

OF

).

5. Press 

A

 to exit the setting screen.

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).

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