Fire System
National Security Systems Inc (800)457-1999
User’s Guide
Table of Contents
Introduction 3
Command Center Function Keys 4
Viewing System Events 5
Warning Displays and Tones 5
Fire Alarms 6
Silencing Fire Troubles 7
Detector Reset Key 8
Annunciator Reset Key 9
The Idle Display 10
How the System Reports Alarms 11
System Functions 12
View Memory 13
Fire Test 14
View Log 16
Remote Program 17
View Point Status 19
Display Rev 20
System Trouble Displays 21
Log Event Definitions 23
System Glossary 26
Maintenance and Service 27
1
2
Introduction
Using the Command Center
Your system’s command center is an advanced digital
device that offers a variety of features. Its highly visible,
back-lit keypad and built-in sounder alert you to a
number of system events.
About This User’s Guide
This user’s guide covers basic system features. It is
designed to be an everyday type of reference for system
users. The functions described in this guide are
programmed by your security company. Some of them
may not be included in your system.
Throughout this guide the # symbol refers to a variable
numerical quantity, such as the number of points to test.
Messages that appear in the command center display
appear in this guide LIKE THIS. Keys that you must
press appear [LIKE THIS].
Your system provides access to functions through the
Menu. Access the Menu by pressing the [ESC] key.
Pressing the [PREV] or [NEXT] key allows you to scroll
up or down through the list of functions programmed by
your security company. Pressing the [ENT] key initiates
the function displayed. To exit the Menu, press the [ESC]
key.
What is a Point?
A “point” is a detection device, or group of devices
connected to your system. Points display individually at
the command center with custom text. The text can
describe a single smoke detector, or an area such as
FIRST FLOOR or LOBBY.
3
Command Center Function Keys
ENT (Enter)
Your command center has four function keys. These
keys are used to control your system.
ESC (Escape)
The [ESC] key has two functions. First, the [ESC] key is
used to enter the Menu. Pressing this key takes you to
the first item in the menu.
Second, pressing [ESC] will take you back to the idle
display.
PREV (Previous)
When viewing a list, pressing the [PREV] key will take
you back to the previously shown item.
NEXT
Press the [NEXT] key to view the next item in a menu or
list.
The function of the [ENT] key is to select the menu item
displayed.
Command Center Quiets for Keystrokes
Pressing [ESC], [PREV], [NEXT], or [ENT] lights the keys
and quiets any warning tones. If you don’t press another
key within 20 seconds, the keypad lights go out and the
warning tones resume.
4
Viewing System Events
Warning Displays and Tones
Your system will automatically display fire alarm events
or fire trouble events as they occur. Fire trouble events
include such things as a broken wire or a closed sprinkler
system valve.
Your command center emits one of several distinct tones
and displays custom text to alert you to system events.
Additional bells or horns may also be connected to your
system. Audible and visual devices such as horns and
strobes alert you to emergencies.
Priority of Events
If more than one event occurs, your system sorts them
into one of three groups. The groups (highest priority
first) are: Fire Alarms, Fire Troubles, and Non-Fire
Troubles.
The group with the highest priority scrolls first in the
command center’s display. Descriptions of the tones and
displays for each group and instructions for silencing the
tones are included in the descriptions that follow.
5
Fire Alarms
Alarm Silence Key
Fire alarms are the highest priority events. When a fire
point activates, your command center emits a pulsating
high-pitched fire tone. Evacuate all occupants and
investigate for smoke or fire. The tone sounds for the
time set by your servicing company.
The command center display shows only the point text of
the first point that went into fire alarm. Pressing the
[NEXT] key will manually display additional points (if any)
that went into alarm. Events scroll from the oldest to the
newest.
Press the [ALARM SILENCE] key to silence a fire alarm.
After pressing [ALARM SILENCE], the system will briefly
display * FIRE SYSTEM * followed by ALARM
SILENCED and then the number of fire points in alarm
(A1 ## FIRE ALARM) in the area and then the custom
text of all the points in alarm in the order of occurrence.
Your system may be programmed so that you cannot
silence some fire alarms until the fire event is cleared.
The example below illustrates the displays one would
see with two points in alarm. See the description of the
Detector Reset key and the Annunciator Reset key for
more information.
* FIRE SYSTEM *
ALARM SILENCED
A1 2 FIRE ALARM
LOBBY SMOKE
1ST FLOOR
6
Silencing Fire Troubles
Special System Trouble Display
After an alarm has been silenced, the device that caused
the alarm is usually still faulted or activated. In the case
of a smoke detector, it must be reset by pressing the
[DETECTOR RESET] button (see page 8). An off-normal
device will create a fire trouble condition. Examples of
trouble conditions include such things as a closed valve
or broken wire. When a fire trouble occurs, your
command center emits three warble tones, then a pause
(repeatedly).
The system displays the number of fire points with
troubles (A1 ## FIRE TRBLE) in an area and will then
repeatedly display the custom text for all the points in
trouble in the order of occurrence.
SERVC AC FAIL and SERVC BATT LOW are
examples of special system trouble displays. These
displays appear on all keypads in the system. These
trouble displays begin with SERVC. See
Displays
display. Pressing the [TROUBLE SILENCE] key will
silence a system trouble tone, but the SERVC display will
not clear until the faulted condition is corrected.
for a description of each system trouble
System Trouble
Trouble Silence Key
Pressing the [TROUBLE SILENCE] key silences a fire
trouble. If the fault condition is still present, the display
will repeatedly scroll from * FIRE SYSTEM * to FIRE
TROUBLE. Manually press the [NEXT] key repeatedly to
display all of the devices that are still off normal. When all
devices return to normal, the FIRE TROUBLE display will
automatically clear. If you wish to review cleared
troubles, this can be done by pressing the [ESC] key to
enter the Menu and then pressing [NEXT] until VIEW
MEMORY ? is displayed. See the VIEW MEMORY ?
function for more information.
7
Detector Reset Key
Description
Detection devices, such as smoke detectors, must be
reset after being activated. Pressing the [DETECTOR
RESET] key momentarily removes power from these
sensors to reset them.
If the fault condition is still present, the display will
repeatedly scroll from * FIRE SYSTEM * to FIRE
TROUBLE. Manually press the [NEXT] key repeatedly to
display all of the devices that are still off-normal. When
all devices return to normal the FIRE TROUBLE display
will automatically clear. Check to be certain that there is
no smoke, fire, or other danger present.
Detector Reset Key
After pressing this key, the display shows
SENSORS RESETING for approximately 3 seconds and
then goes blank before returning to the repeated display
of * FIRE SYSTEM * followed by ALARM SILENCED.
This function clears alarm point information from the
display. The ALARM SILENCED message continues to
display as a reminder that the VIEW MEMORY ? function
can still be used to view cleared point information.
Pressing the [ANNUNCIATOR RESET] key will clear
both the View Memory buffer and the ALARM SILENCED
display. For more information see the description of the
View Memory function.
If you can’t reset the detector or sensor contact your
service company.
8
Annunciator Reset Key
Description
After the [ALARM SILENCE], [TROUBLE SILENCE] and/
or [DETECTOR RESET] keys have been pressed, the
cleared keypad display information can still be retrieved
with the VIEW MEMORY ? menu function. Pressing the
[ANNUNCIATOR RESET] key will clear the
ALARM SILENCED message from the display and clear
the VIEW MEMORY ? buffer and return the display to idle
text.
Thereafter the VIEW MEMORY ? function will display
NO EVENTS until another trouble or alarm occurs. Using
[ANNUNCIATOR RESET] has no effect on the VIEW
LOG ? function. See the VIEW MEMORY ? and VIEW
LOG ? functions for more information.
9
The Idle Display
“At an idle state” means that the system is not currently performing a function entered by a user.
• PRESS ALARM SIL Indicates that the [ALARM SILENCE] key needs to be pressed.
• * FIRE SYSTEM * This is the normal idle display that indicates the system is normal and ready to function.
• CHECK FIRE SYS This is one of a number of displays that indicate the system requires service.
This guide uses the default idle state displays for examples of these idle states. Your security company may have
programmed custom text for the idle displays in your system.
10
Keystroke Checking Tones
How the System Reports Alarms
Valid Entry
If you press an appropriate key for the function or entry
you desire, the command center sounds a muted beep
tone, indicating it accepted your keystroke.
Invalid Entry
A flat buzz tone sounds when you press a key that
doesn’t have a function to execute or when the command
center has no information to display.
Your system may be programmed to automatically send
reports to your monitoring facility. This communication
temporarily disconnects your telephones. Once the
report is completed, your system returns the telephones
to normal operation (check with your servicing company).
Your system makes repeated attempts to send reports to
your monitoring facility. In the event your system fails to
communicate, the command center buzzes and displays
SERVC COMM FAIL. Notify your servicing company of
the communications failure.
Note: If your telephone service is interrupted, your
system cannot send reports unless it has an alternate
means of transmitting them.
11
System Functions
Below is a summary of the features covered in this guide. Some of these functions may not be available in your menu.
Access the menu by pressing the [ESC] key. The first menu item, ALARM SILENCE ?, is displayed. This function can
be selected by pressing the [ENT] key. Doing this has the same effect as pressing the [ALARM SILENCE] key.
Pressing the [NEXT] key when ALARM SILENCE ? is displayed will bring up the second menu item, which is TROUBLE
SILENCE ?. Pressing [NEXT] again displays the third item in the menu, DETECTOR RESET ?. Pressing [NEXT] once
more displays the fourth menu item, ANNUNCATOR RESET ?. These menu items perform the same functions as the first
four keys on the command center. Continue pressing the [NEXT] key to access special menu items that may have been
programmed into your system by your servicing company. Pressing the [ENT] key while one of these items is displayed
will perform that function. Each of these functions is described in the following pages.
Menu Item Function
1 ALARM SILENCE
2 TROUBLE SILENCE
3 DETECTOR RESET
4 ANNUNCIATOR RESET
5 VIEW MEMORY
6 FIRE TEST
7 VIEW LOG
8 REMOTE PROGRAM
9 DISPLAY REV
10 VIEW PT STATUS
12
VIEW MEMORY?
Using View Memory:
View Event Memory
Description
Event memory allows you or a service technician to review
events after they are cleared from the command center’s
display. Use this function to view event memory.
Your system stores events that have occurred since the
last time [ANNUNCIATOR RESET] was pressed. Each
time you press the [ANNUNCIATOR RESET] key, the
ALARM SILENCED message will clear from the display and
the Event Memory is erased and new events are recorded
as they occur.
1. Press the [ESC] key to enter the menu, then press
[NEXT] repeatedly until you reach the VIEW MEMORY
? prompt. Press [ENT].
2. Your system displays event summary lines and point
text in this order: fire alarm summary line, point text
for each fire alarm event; fire trouble summary line,
point text for each fire trouble event; trouble summary
line, and point text for each trouble event. Press
[NEXT]
events to view, NO EVENTS displays.
3. Return to idle text at any time by pressing
to scroll through the events. If there are no
[ESC]
.
13
FIRE TEST ?
Using Fire Test:
Description
Use this function to test fire points to be certain they
function properly. You can review untested points at your
command center to help locate the remaining detectors
to be tested.
Upon initiation, the fire test will test the fire pattern on the
alarm output and ring the command center sounder for 2
seconds. The AC will be disabled for 4 minutes in order
to test the system’s battery power. If the battery cannot
maintain the system for the 4 minute period, the
command center will appear to go dead. If this happens,
contact your servicing company. At the end of the 4
minute period, AC is returned to the system and the
panel restores. A message will be sent to your monitoring
facility upon initiation and completion of the Fire Test.
During the Fire Test, no alarms will be sent to your
monitoring facility.
If there is no activity on the system for 20 minutes, the
system will automatically exit from the Fire Test.
1. Press the [ESC] key to enter the menu, then press
[NEXT] repeatedly until you reach the FIRE TEST ?
prompt. Press [ENT].
2. The display shows ## PTS TO TEST
3. One-at-a-time, activate the detection devices to fault
each point.
4. As you fault each point, your command center will
display the point text for 60 seconds and the bell will
sound for 2 seconds. This verifies that the detection
device is working properly. Your system
automatically resets smoke detectors.
When a resettable point (such as a smoke detector)
is faulted, the display shows SENSOR RESETTING
for 5 seconds. During this time power is removed
from smoke power relays.
.
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FIRE TEST ? (continued)
Faulting a point more than once does not increment
the test count. However, the command center emits
a brief tone and displays the point text each time you
fault the point, allowing you to test multiple devices
assigned to one point.
5. When all points have been tested, 0 PTS TO TEST
is displayed. Press [ESC]. The display momentarily
shows ALL PTS TESTED before returning to idle
text.
6. During the Fire Test you may want to see the points
that remain untested. Press the [ESC] key and
VIEW UNTESTED ? is displayed. Press [ENT]. The
display shows # PTS UNTESTED. Press [NEXT] to
see a list of the points that have not yet been tested.
Move through this list by pressing the [NEXT] key.
To resume the Fire Test, press [ESC]. ## PTS TO
TEST is displayed.
Press [ESC] twice to leave the Fire Test mode.
Automatic time-out returns the system to idle text:
there is no point or command center activity for 20
minutes, the fire test ends automatically. The command
center returns to idle text.
If
15
VIEW LOG ?
2. ENTER START DATE displays.
Description
Use this function to review events in your system at your
command center. Reviewing past events may help you
identify problems. Viewing events does not require any
additional equipment since the information is displayed at
your command center. Events are stored in the panel’s
memory in order of occurrence and tagged with the date
and time.
See the
information regarding logged events.
Using View Log:
1. Press the [ESC] key to enter the Menu, then press
Log Event Definitions
[NEXT] repeatedly until you reach the VIEW LOG ?
prompt. Press [ENT].
section for more
• To view the entire log from the newest event, press
[ENT].
The date and time of the event will display. Press
[NEXT] to view the description of the event, or press
[PREV] to view the description of the prior event.
Press [PREV] again to view the date and time of the
previous event.
Continue to press [PREV] to view event descriptions
and the date and time of each event.
Note: When using the [NEXT] key to view the log,
the date and time of the event are displayed first,
followed by the description of the event. An event
description may take up 2 displays.
3. Continue pressing [NEXT] to view the rest of the log.
When you reach the end of the log, END OF LOG
displays.
4. Press [ESC] to return to idle text.
16
REMOTE PROGRAM ?
Description
Your servicing company can remotely program your
security system using the telephone line your panel is
connected to.
For systems without a phone number:
1. Ensure your security system is at idle text.
2. Call this phone number: ______________________.
This number is designated for the Remote Account
Manager. You must make the call using the
telephone located ___________________________.
Your servicing company may ask you to follow the steps
below to begin a remote programming session. The time
it takes to program the panel is dependent on the number
of changes made to the program.
You’ll notice that two sets of procedures are presented.
Which one you use will depend upon whether your
system has a pre-programmed telephone number in its
memory.
My system has a phone number.
My system does not have a phone number.
3. Identify yourself and your premises (account
number, name, address, etc.) and advise the
operator of the services you wish to have performed.
4. Press the [ESC] key to enter the Menu, then press
[NEXT] repeatedly until you reach the REMOTE
PROGRAM ? prompt. Press [ENT].
5. The display shows RAM CONNECTING.
6. The security system will now disconnect telephones
sharing its telephone line during the remote
programming session. Hang up the telephone now.
7. The display changes to SYSTEM PROGRAM.
17
8. At the conclusion of the programming session your
system sends a report to the security company and
then returns your telephone to normal service and
your display to idle text.
For systems with a phone number:
1. Ensure your security system is at idle text.
2. Call this phone number: ______________________.
This number is designated for the Remote Account
Manager.
3. Identify yourself and your premises (account
number, name, address, etc.) and advise the
operator of the services you wish to have performed.
4. Press the [ESC] key to enter the Menu, then press
[NEXT] repeatedly until you reach the REMOTE
PROGRAM ? prompt. Press [ENT].
5. The display shows CALL RAM ?
Note: The central station may direct you to press
[NEXT]. When you do this, ANSWER NOW displays.
Press [ENT] and the system will behave as
described in steps 5 - 8 above.
• If you want your system to call the RAM, press
[ENT] when the display shows CALL RAM ?.The
display shows CALLING RAM momentarily as the
panel dials the RAM phone number in its memory.
The display changes to SYSTEM PROGRAM when it
has connected to RAM.
6. At the conclusion of the programming session your
system sends a report to the security company and
then returns your telephone to normal service and
your display to idle text.
18
VIEW PT STATUS ?
Description
Use this function to identify the number or location of
each point in an area, and to show the current condition
of any point you select. This function is useful as an aid
in servicing the system.
• PT###_OPEN_HW which indicates that a HW point is
open.
• PT###_NORML_HW which indicates that a HW point
is normal.
• PT###_MISNG_HW which indicates that a HW point
is missing.
1. Press the [ESC] key to enter the Menu. Press
[NEXT] until the VIEW PT STATUS ? function is
displayed.
2. Press [ENT]. The display shows AREA X ##
(where X = the area number and ## = the number of
points to view).
3. Press [ENT]. The display shows PT ## XXXXX
(where XXXXX = the type of point). Press [ENT]
again to see the current condition of the point. The
display will show one of the following:
• PT###_SHORT_HW which indicates that a hard wire
(HW) point is shorted.
4. Continue to press [ENT] to see the type and
condition of each point in the area.
5. Press [ESC] to return to idle text.
19
DISPLAY REV ?
Description
This function displays the revision of firmware currently
installed in the panel.
1. Press the [ESC] key to enter the Menu. Press
[NEXT] until the DISPLAY REV ? function is
displayed.
2. The current revision of firmware displays
(9112 REV # # - # #) for 5 seconds.
3. The display returns to idle text.
20
System Trouble Displays
If you see any of the system trouble displays shown
below, contact your servicing company to determine
whether repairs are needed.
SERVC BATT LOW
Indicates the system’s battery is low, or temporarily
draining faster than the system can charge it. If this
display remains or appears frequently, call your security
company for service.
CALL FOR SERVICE
Call your servicing company. Your security system may
have failed.
SERVC PANEL
Indicates a problem with the panel. The panel is not
operating. Call your servicing company for service.
SERVC PARAM
Indicates a problem with the panel. Your panel may not
be operating properly. Call your servicing company for
service.
SERVC AC FAIL
Indicates that AC power to the system is interrupted.
Check the plug-in transformer and circuit breaker.
Pressing [TROUBLE SILENCE] silences the trouble
buzz. The display clears when AC power returns.
SERVC BATT MSING
Indicates the system’s battery is disconnected or
shorted.
SERVC COMM FAIL
Your system makes repeated attempts to communicate
with the monitoring facility. In the event your system fails
to communicate, the command center buzzes and
displays SERVC COMM FAIL. Notify your servicing
company of the communication trouble. This message
may not appear in some systems.
SERVC KEYPAD
Indicates that a command center, other than the one
displaying the message, is in a trouble condition. Notify
your servicing company.
21
SERVC PH LINE #1 (or 2)
Indicates telephone line trouble. Call your phone
company from another phone to report telephone trouble.
This message may not appear in some systems.
SERVC PRINTER
Indicates that a local printer (if installed) at your premises
is in a trouble condition. Check to be sure the printer is
powered on, the paper is correctly is inserted, and the
printer is selected. Contact your servicing company if you
have questions or the display doesn’t clear. You system
may not include a local printer.
SERVC PT BUS #
Displays when a problem has occurred with one of the
panel’s circuits. Call your security company.
FIRST DISARM
Indicates that the function requested can only be performed
when the idle display shows * FIRE SYSTEM *. Press the
[ALARM SILENCE] key.
ALARM SILENCED
This display is added to the scrolling alarm display when
alarm sounders are silenced. This message clears when
the [ANNUNCIATOR RESET] key is pressed.
FIRE BYPASS
This display is scrolled when a fire point has been
removed from the system via the keypad using the
Bypass a Point ? function.
22
Log Event Definitions
AC FAIL - AC power to the panel interrupted.
AC RSTOR - AC power to the panel restored.
ALARM - Alarm at point in area specified.
BYPASS - Point bypassed. An event modifier showing how
the point was bypassed follows this event in the log.
CANCEL - User canceled an alarm from the area specified.
CKSUM FAIL - Panel programming corrupted. Call for
service.
AUTO - Event Modifier for BYPASS event. Indicates 4
alarms or troubles in one clock hour caused automatic
(swinger) bypass.
BAD CALL - System tried to call Remote Account Manager
and failed.
BATT LOW - Panel battery is below 11.7 VDC.
BATT MISS - Panel battery disconnected or discharged.
BATT RSTOR - Panel battery recharged.
BUS RSTOR - Data Expansion Loop for off-board points
restored.
BUS TRBLE - Data Expansion Loop for off-board points
faulted.
COMM FAIL - Panel could not communicate using phone
line reported.
COMM RSTOR - The communication problem with the phone
line indicated resolved.
DATE CHG - User changed panel’s date and/or time.
EXTRA PT - Incorrectly programmed point connected to
system.
FIRE ALARM - Fire alarm at point in area specified.
FIRE END - Fire Walk Test ended.
FIRE RSTOR - Fire alarm at point specified restored.
23
FIRE TRBLE - Trouble condition at point specified.
FIRE START - Fire Walk Test started.
LOG FULL - Panel log is full. New event overwrite oldest event.
LOG THRES - Panel log reached programmed threshold (Log
% Full).
MISS FIRE - Fire point specified missing.
MISS TRBLE - Point in area specified missing. Area disarmed.
PARAM CHG - Panel programming changed.
PHONE FAIL - Panel detected phone line specified as faulted.
PROG OK - Panel successfully programmed by a local
programmer.
PT TESTED - This point walk tested.
PWR RESET - Power was reset at specified time.
RAM FAIL - RAM programming session terminated abnormally
or RAM using incorrect passcode and/or lock code.
RAM OK - RAM programming session terminated normally.
REBOOT - Panel reset.
RELAY SET - Relay set (activated). An event modifier showing
how the relay was set follows this event in the log.
PHONERESTOR - Phone line specified detected as restored
from faulted condition.
PROG - Event modifier for BYPASS, RELAY SET, and RELY
RESET events. Indicates function initiated from local
programmer.
PROG BAD - Attempt to access panel with a local programmer
failed.
RELY RESET - Relay reset (deactivated). An event modifier
showing how the relay was reset follows this event in the
log.
REMO - Event modifier for BYPASS, RELAY SET, and RELY
RESET events. Indicates function initiated from RAM
(Remote Account Manager).
24
REMO RESET - Panel reset from RAM (Remote Account
Manager).
RESTORAL - Restoral at device in area specified.
SDI FAIL - SDI device specified is not working. 1 - 8 =
supervised command centers, 017, 018, 019 = printers.
STAT RPT - Status report sent.
TEST RPT - Test report sent.
TIME CHG - User changed panel’s time.
TROUBLE - Trouble condition at point specified.
SDI RSTOR - The problem with SDI device specified
resolved.
SENSOR - Event modifier for SENS RESET event. Shows
the relay number activated for reset.
SENS RESET - User reset area sensor in area specified. An
event modifier showing the relay number activated for
reset follows this event.
SKD CHG - User changed time for Sked specified to be
executed.
SKD XEQ - Sked executed.
SKED - Event modifier for BYPASS, RELAY SET, and RELY
RESET events. Indicates function initiated by a SKED
(scheduled event).
WALK END - Walk test in area specified completed.
WALK STRT - Walk test initiated in specified area.
WATCHDOG - Panel’s normal CPU operation interrupted and
restarted. Call for service if event occurs regularly or
frequently.
25
System Glossary
Area - A group of detection devices connected to your
security system.
Monitoring Facility - A facility where trained personnel
monitor your system 24 hours a day. Your system
may be programmed to contact this facility during
alarm conditions, enabling personnel to dispatch the
proper authorities.
Menu - A list of functions programmed by your servicing
company.
Faulted Point - A point that is not normal.
Idle Text - The system displays idle text at command
centers when it is not performing a user requested
function. Idle text shows the status of the system.
Point - A detection device, or group of devices connected
to your system. Points display individually at the
command center with custom text. The text can
describe a single smoke detector, or an area such as
UPSTAIRS or GARAGE.
Relay - Your system may have relays programmed to
provide control of devices such as premises lighting
or entry gates. Your security company programs
relays for automatic control and/or control from your
command center.
Trouble - A service condition that needs to be corrected,
such as a broken wire.
26
Maintenance and Service
National Security Systems Inc (800)457-1999
This system requires very little maintenance, however,
you should test the system weekly to ensure it is working
properly. A test schedule and maintenance program can
be arranged. If you notice a change in operation during
normal use or testing, call for service as soon as
possible. Do not attempt to repair the control panel,
command centers, or detectors yourself.
How to Clean the Command Center
If your command center gets dirty, apply a
household glass cleaner to a clean cloth or paper
towel and wipe the surface. Do not spray any liquid
directly onto the command center. It could run inside
the case and damage electrical circuits.
71-06991-000-C 9/93
D1256
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