Uplink 4555 Installation & User Manual
All-In-One 4-Zone Fire Panel With Built-In
Primary GSM Cellular Communicator
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4555
All-In-One 4-Zone Fire Panel With Built-In
Primary GSM Cellular Communicator
INSTALLATION &
USER’S GUIDE
PRODUCT ID # 202132UP4555
USER’S GUIDE DRAFT 2.0
ID # 00-25580-770
REVISION 1.2
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To download a copy of this manual go to
the dealer portal on www.uplink.com.
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All-In-One 4-Zone Fire Panel With Built-In
Primary GSM Cellular Communicator
Table of Contents
1. Introduction ................................................................................................................ 4
2. Key Features .............................................................................................................. 5
3. Warranty Information and Liability Waiver ................................................................. 8
TERMS and CONDITIONS .................................................................................... 8
LIMITED WARRANTY ........................................................................................... 8
NO WARRANTY – SERVICES ............................................................................... 8
INDEMNIFICATION ............................................................................................... 9
LIMITATIONS of LIABILITY .................................................................................... 9
4. FCC and Industry Canada Regulatory Compliance ................................................. 10
Part 15 ................................................................................................................ 10
Part 68 ................................................................................................................ 10
5. FCC RF Exposure Information ................................................................................. 12
6. Technical Support .................................................................................................... 12
7. Installation ................................................................................................................ 13
A. General Considerations ........................................................................................... 13
B. DIP Switch Settings ................................................................................................. 13
C. LEDs ......................................................................................................................... 14
D. Locating and Installing the 4555 .............................................................................. 18
E. Connecting The 4555 to the Monitored Equipment and Telephone Jack ............... 21
F. Activating The 4555 Unit .......................................................................................... 26
G. Programming and Central Station Reporting ........................................................... 27
H. Completing the Installation and Testing ................................................................... 29
8. UL COMPLIANCE SECTION –Installation Recommendations ................................ 30
Commercial Fire (UL 864 - Category UOJZ) ...................................................... 30
9. Specications .......................................................................................................... 33
Appendix A: Contact ID and SIA Event Codes – The following is a list of
default event codes and Zones that can be sent to the central station .................. 35
Appendix B: Web-congurable parameters for UL 864 compliance. ........................... 37
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1. Introduction
Uplink’s MODEL 4555 Fire Panel with Built-In Wireless Alarm Communicator is an Underwriters
Laboratory Listed alarm and critical event primary communicator designed to interface with
any event monitoring interface having switch closure characteristics. The 4555 features two
independent transmission paths from the unit to the Central Station, TELCO and GSM Cellular
Network. The cellular radio provides primary signaling, or secondary communications to the
TELCO interface. In backup, if TELCO connection is compromised, or if no TELCO connection is
present, the 4555 will automatically send any alarm information via its GSM connection, through
the Uplink gateway and to the Central Station. In either case the alarm communicator transmits the
alarm information to the central station receiver in either Contact ID (SIA-DC05) or SIA (SIA-DC03)
format.
In addition, the 4555 uses GSM technology to receive programming and setup information.
The unit has 4 supervised inputs and 3 outputs and can be programmed to automatically send a
test message at periodic intervals.
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All-In-One 4-Zone Fire Panel With Built-In
Primary GSM Cellular Communicator
2. Key Features
A. Discrete Event Reporting. All information sent by the alarm communicator in Contact ID or
SIA formats (account number, zone information, user IDs, etc.) will be sent to the central station
using the telephone line or the GSM network.
B. Telephone Line Supervision. Features a built-in telephone line monitoring circuit designed to
detect voltage (in the On-Hook state) or voltage and current (in the O-Hook state). If insucient
voltage or current is detected, the unit will substitute the GSM cellular network for the Public
Switched Telephone Network as the communications path for sending event information. A TELCO
loss alarm will be generated and the on-board buzzer will annunciate, thereby providing local
indication of TELCO loss.
C. Input Signal Supervision. Each of the 4 inputs has the ability to supervise the connection to the
input source. EOL resistors assure that there is no undetected break in the input signal wiring.
D. Zone Inputs. There are many types of events that can be reported or mapped to a local
notication appliance covering input alarms, ground faults, input troubles, AC power loss, Battery
power loss, Telco troubles and GSM Network troubles. Each of these events is assigned a specic
zone number by default and can be re-programmed Over-the-Air via the Support Web site.
E. Outputs. There are three programmable outputs. Output 1 is a Supervisory NAC - 24VDC
output capable of driving up to 400mA. Output 2 is a form B relay that is normally open when
energized and is congurable. Output 3 is a resettable smoke power output and, for UL
compliance, may only be used as such. It is a 24VDC output capable of driving up to 160mA.
Outputs 1 and 2 can be programmed Over-the-Air and in addition, can be activated on the
occurrence of one or more of the following trouble or alarm conditions:
• Cellular Network Loss
• No Central Station Acknowledgment
• AC Loss
• Low or Missing Battery
• Telco Line Loss
• Loss of supervision of Input(s)
• Loss of supervision of Outputs(s)
• Activation of Input(s)
• Unit Disabled by Dealer Command
• Watchdog Circuit Activation
• Catastrophic Failure Condition
• Ground Fault Detection
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F. Power Source Monitoring (AC & Low Battery Reporting). Reports low battery conditions to
the central station when voltage drops below 20.4 VDC. Reports Low Battery Restoral. Reports No
Battery if the voltage is below 1 VDC. It can also be programmed to report Loss of AC power to the
central station. This occurs at 89.9 VAC and restores at 93.4 VAC.
G. Local Annunciation. All TROUBLES, ALARMS, and FIRE ALARMS are annunciated by an on-
board buzzer, as well as visually indicated via an LED block, viewable from outside the enclosure.
Alarms can be silenced with a single push of the silence/reset switch, and can be cleared with a
double push of the silence/reset switch.
H. Automated Testing. Sends an automated test signal to the central station on a monthly,
weekly or daily interval as programmed. Must be programmed for daily to be UL compliant.
I. GSM Network Supervision. Supervises the local GSM network. If the unit no longer locates
the local GSM network, one of its output relays activates to report this trouble condition locally. The
unit then automatically takes steps to restore the network connection.
J. Status/Received Signal Strength LEDs. The ve LEDs indicate the current operational
status and are visible from outside the enclosure. These LEDs can be placed into Received Signal
Strength Indication mode (RSSI) to assist in selecting the optimal mounting location for transmitting
and receiving cellular radio signals.
K. UL Compliant metal enclosure. The unit is housed in an industry accepted Red metal
enclosure, complete with local audible and visual annunciators. A single push button switch can be
used to silence or reset the alarms/trouble annunciators.
L. Easy Service Initiation. Ships with an active SIM card, with easy activations available via the
Web at www.uplink.com or by calling Uplink Customer Service at 1-888-9-UPLINK (1-888-987-
5465). Requires the central station receiver phone number and/or its IP address and Port number.
M. Web-based Services. Available at www.uplink.com and include:
a. immediate, real-time activation
b. history of past event transmissions
c. initiation of a test report
d. the ability to query the unit and receive a real-time radio report status including a Received
Signal Strength reading
e. programming inputs and other internally generated events
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All-In-One 4-Zone Fire Panel With Built-In
Primary GSM Cellular Communicator
N. UL Listed.
The Model 4555 unit is UL Listed and conforms to UL Standard 864 for Control Units and
Accessories for commercial re alarm systems. It is perfectly suited for use in any UL certicated
commercial re alarm system that conforms to the above standard. (See the UL Compliance
Section of this manual for complete details.)
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3. Warranty Information and Liability Waiver
TERMS and CONDITIONS
These terms and conditions are a legal contact between you and Uplink Security, LLC ("Company")
and supplement (but do not supersede) the terms and conditions of any master agreement between
you and “Company” governing your purchase of the Product. By using, marketing, or selling the
Product, you agree to these terms and conditions. In the event of any conict with the master
agreement, the terms and conditions of the master agreement will control.
LIMITED WARRANTY
Uplink warrants, to the party purchasing the Product directly from Uplink, i.e., to its authorized
distributors and to no other parties, that for 12 months following the date of purchase, Uplink equipment
will be free of defects in materials and workmanship when installed, operated, maintained, and
serviced in strict accordance with Uplink’s and, if applicable, the manufacturer’s requirements. If Uplink
equipment fails because of a defect in materials or workmanship within the warranty period, Uplink
will, at its sole option and at no charge, repair or replace it. Uplink’s agreement to repair (using new or
reconditioned parts) or replace (with a comparable new or reconditioned Uplink unit) is the exclusive
remedy with respect to the Product found to be defective in materials or workmanship; this remedy will
not be deemed to have failed of its essential purpose so long as Uplink is willing and able to repair or
replace the defective unit as provided above or, at Uplink’s sole option, to refund the purchase price
paid. A party purchasing the Product from a distributor must direct all claims to the distributor with
respect to any Product claims it may have.
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THE FOREGOING WARRANTY IS LIMITED AND IS THE ONLY WARRANTY OFFERED
HEREUNDER. UPLINK MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING,
WITHOUT LIMITATION, ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE, TITLE, NON-INFRINGEMENT, AND NON-OBSOLESCENCE.
THE FOREGOING WARRANTY FURTHERMORE DOES NOT COVER UPLINK DEVICES THAT
(A) HAVE BEEN IMPROPERLY INSTALLED, MAINTAINED, OR SERVICED; (B) HAVE BEEN
TAMPERED WITH OR DEFACED; OR (C) HAVE BEEN SUBJECTED TO ABUSE OR A HOSTILE
OPERATING ENVIRONMENT.
NO WARRANTY – SERVICES
ALL SERVICES ASSOCIATED WITH UPLINK DEVICES INCLUDING, WITHOUT LIMITATION,
NETWORK CONNECTIONS ENABLED BY UPLINK, ARE PROVIDED STRICTLY AS-IS, WITHOUT
ANY WARRANTY OF ANY KIND INCLUDING, WITHOUT LIMITATION, WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, TITLE, NON-INFRINGEMENT,
NON-OBSOLESCENCE, NON-INTERRUPTION, AND FREEDOM FROM ERROR.
Other terms and conditions and limitations of liability apply as set forth in the applicable contractual
agreement with Uplink.
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All-In-One 4-Zone Fire Panel With Built-In
Primary GSM Cellular Communicator
INDEMNIFICATION
You agree to defend, hold harmless, and indemnify the Company and its aliates and their
respective ocers, directors, employees, and agents from and against any and all damages,
liability, costs, and expenses (including, without limitation, reasonable attorneys’ fees) arising out
of or relating to (a) any claim for breach of this Agreement by you; (b) any claim for negligence,
intentional misconduct, or any other act or omission on the part of you or your employees, agents,
or representatives; (c) personal injury, death, or property damage allegedly or impliedly caused by
you or your employees, agents, or representatives in connection with this Agreement; or (d) any
claim that an application of the Product or your actions in distributing the Product or integrating it
with other hardware, software, or systems infringe the intellectual property rights of a third party.
LIMITATIONS of LIABILITY
THE COMPANY SHALL NOT BE LIABLE FOR ANY ACTS OR OMISSIONS OF YOU, YOUR
CUSTOMERS, END USERS OF THE PRODUCT, OR ANY THIRD PARTY INCLUDING, WITHOUT
LIMITATION, ANY ENTITY FURNISHING EQUIPMENT, SOFTWARE, FIRMWARE, OR SERVICES
TO THE COMPANY, YOU, YOUR CUSTOMERS, OR END USERS OF THE PRODUCT, NOR
SHALL THE COMPANY BE LIABLE FOR ANY DAMAGES ATTRIBUTABLE, IN WHOLE OR IN
PART, TO THE FAILURE OF SAID EQUIPMENT, SOFTWARE, FIRMWARE, OR SERVICES. THE
COMPANY SHALL NOT BE LIABLE FOR INTERRUPTIONS IN, OR INTERFERENCE WITH,
THIRD PARTY TELECOMMUNICATIONS CARRIERS’ TRANSMISSIONS OVER WHICH THE
COMPANY HAS NO CONTROL, I.E., FOR INTERRUPTIONS OR INTERFERENCE CAUSED
BY NETWORK CONGESTION, WEATHER CONDITIONS, TERRAIN, BUILDINGS, LOCALIZED
“GAPS” IN TELECOMMUNICATIONS NETWORK COVERAGE, AND OTHER NATURAL OR
ARTIFICIAL CONDITIONS OVER WHICH THE COMPANY HAS NO CONTROL. THE COMPANY
SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, PUNITIVE,
OR CONSEQUENTIAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST REVENUES,
DATA, OR PROFITS, REGARDLESS OF WHETHER THE COMPANY WAS ADVISED OF, OR
COULD HAVE REASONABLY FORESEEN, THE POSSIBILITY OF SUCH DAMAGES. THE
COMPANY SHALL NOT BE LIABLE IN THE EVENT THAT FUTURE TECHNOLOGICAL CHANGES
IMPLEMENTED BY ANY THIRD PARTY OR GOVERNMENTAL ENTITY RENDER THE PRODUCT
WHOLLY OR PARTIALLY INOPERABLE. OTHER LIMITATIONS OF LIABILITY MAY APPLY AS
PROVIDED BY THE MASTER AGREEMENT, IF ANY, GOVERNING YOUR PURCHASE OF THE
PRODUCT FROM THE COMPANY.
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4. FCC and Industry Canada Regulatory Compliance
Part 15
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two
conditions: (1) this device may not cause harmful interference, and (2) this device must accept
any interference received, including interference that may cause undesired operation.
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment o and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit dierent from that to which the receiver
is connected.
• Consult the dealer or an experienced technician for help.
Part 68
This equipment complies with Part 68 of the FCC rules and the requirements adopted by the
ACTA. On the inside of the cover of the 4555 is a label that contains the product identier, US:
3F0MO00BANYNETFDM. If requested, this number must be provided to the telephone company.
The 4555 employs one USOC RJ31X jack.
The RJ31X plug and jack used to connect this equipment to the premises wiring and telephone
network must comply with the applicable FCC Part 68 rules and requirements adopted by the
ACTA. A compliant telephone cord and modular plug is provided with this product. It is designed to
be connected to a compatible modular jack that is also compliant.
The Ringer Equivalence Number (REN) is used to determine the number of devices that may
be connected to a telephone line. Excessive RENs on atelephone line may result in the devices
not ringing in response to an incoming call. In most but not all areas, the sum of RENs should
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All-In-One 4-Zone Fire Panel With Built-In
Primary GSM Cellular Communicator
not exceed ve (5.0). To be certain of the number of devices that may be connected to a line, as
determined by the total RENs, contact your local telephone company. The REN for this product is
part of the product identier that has the format US:AAAEQ##TXXXX. The digits represented by ##
are the REN without a decimal point (e.g., 03 is a REN of 0.3).
If the 4555 causes harm to the telephone network, the telephone company will notify you in
advance that temporary discontinuance of service may be required. But if advance notice is not
practical, the telephone company will notify the customer as soon as possible. Also, you will be
advised of your right to le a complaint with the FCC if you believe it is necessary.
The telephone company may make changes in its facilities, equipment, operations or procedures
that could aect the operation of the equipment. If this happens, the telephone company will provide
advance notice in order for you to make necessary modications to maintain uninterrupted service.
If trouble is experienced with the 4555, please contact Uplink Technical Support at 888-9-UPLINK
(888-987-5465) for Repair and Warranty service. If the equipment is causing harm to the
telephone network, the telephone company may request that you disconnect the equipment until
the problem is resolved.
The 4555 is not designed to be repaired in the eld by an Installer. Repairs to this unit should only
be undertaken by qualied Uplink Security personnel.
The 4555 should not be used on a party line. Connection to party line service is subject to state
taris. Contact the state public utility commission, public service commission or corporation
commission for additional information.
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5. FCC RF Exposure Information
In August 1996 the Federal Communications Commission (FCC) of the United States with its action
in Report and Order FCC 96-326 adopted an updated safety standard for human exposure to radio
frequency electromagnetic energy emitted by FCC regulated transmitters. Those guide-lines are
consistent with the safety standard previously set by both U.S. and international standards bodies.
The design of this module complies with the FCC guidelines and these international standards. The
FCC ID of this unit is TWV192513384X. For more information about RF exposure, please visit the
FCC website at www.fcc.gov.
The term “IC” before the certication/registration number only signies that the Industry Canada
Technical Specications were met. The external antennas used for this module must provide a
separation distance of at least 20cm from all persons and must not be co-located or operating in
conjunction with any other antenna or transmitter.
6. Technical Support
Technical support is available Monday through Friday, 8:00 AM to 8:00 PM ET excluding holidays.
Before calling technical support please ensure to have read the installation guide completely.
Technical support requires the caller to provide:
• Login name
• Password
• Serial number of the 4555
UPLINK Technical Support
400 Interstate North Pkwy
Suite 1350
Atlanta, GA 30339
888-9-Uplink (888-987-5465)
Fax: 770-693-3501
For Customer Support, call 888-987-5465, or visit www.uplink.com.
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All-In-One 4-Zone Fire Panel With Built-In
Primary GSM Cellular Communicator
7. Installation and Conguration
NOTICE TO USERS, INSTALLERS, AUTHORITIES HAVING
JURISDICTION AND OTHER INVOLVED PARTIES
This product incorporates eld-programmable software which can be changed over the GSM
Wireless connection. In order for the product to comply with the requirements in the Standard
for Control Units and Accessories for Fire Alarm Systems, UL 864, certain programming
features or options must be limited to specic values.
The list of possible modiable conguration options, as well as the proper settings to maintain UL
864 Compliance, is listed in Appendix C: Web-congurable parameters for UL compliance.
A. General Considerations
Determine where to mount the unit. Keep the following in mind:
a. Obtain the best transmitted and received signal strength for the cellular radio. (If a very strong
cellular signal is not available, rst power the unit with the AC power and turn on S4 to test for
the location that provides the best signal strength.)
b. Proximity to a non-switched Plug for the AC transformer.
c. Proximity to the monitoring equipment and where to route the 4555 unit’s relay outputs that
connect other devices (These wires will need to be in conduit for a UL certicated installation.
See the UL Compliance Section.)
d. Proximity to the RJ31X Telco jack from the telephone system.
B. DIP Switch Settings
The 4555 has a four-position dipswitch. The dipswitches function as follows:
SWITCH NO. SETTING FUNCTION
S1: Default OFF Normal Operations
Load ON Load defaults
S2: OTA OFF OTA conguration Allowed
Operation ON OTA conguration Blocked
S3: Buzzer OFF Normal Operations
Override ON Buzzer disabled
S4: LED OFF Normal Operations
Function ON RSSI Measurements
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Notes:
S1 can be used to set the unit back to factory defaults. ALL CONFIGURATION PARAMETERS WILL
BE LOST. Turn S1 on, LEDs will ash red / green several times, then stay solid red. Unit is now
defaulted – turn S1 o.
S2 can be used to ‘lock down’ a conguration option. However, as long as S2 is ON, NO OTA
(Over-the-Air) CONFIGURATION commands will be accepted.
S3 can be used to temporarily silence the on-board buzzer. FOR UL OPERATION, this switch must
be turned o.
S4 can be used to nd the most optimal signal strength during installation. This switch must also
be turned o for UL operation.
C. Local Sounder Information
A sounder on the circuit board is included and it generates a tone of volume such that it is
consistent with UL864.
The Sounder is programmable and may be turned on and o via the Local test as well as OTA. The
Sounder generates three distinct tone patterns:
1. Temporal - this is where the tone is on for .5 seconds, o for .5 seconds, on for .5 seconds, o
for .5 seconds, on for .5 seconds, o for 1.5 seconds and then repeats.
This is used when the alarm mapped to the ZONES 1, 2, 3, and/or 4 is allocated to a FIRE
ALARM (default).
Note: This alarm, as long as it is active, takes precedence over any other sound.
2. Constant - tone is always on. If any ZONE 1-4 is congured as an ALARM other than FIRE.
An example of this might be if ZONE1 is congured as an ALARM (generic). It is also used when
testing the sounder.
3. Short Pulse - this is where the tone is on for .5 seconds and o for 4.5 seconds. This is used
when any TROUBLE or ALARM is detected that is not due to ZONE1-4 going o-normal (e.g.
ZONE1 Unsupervised or Telco Loss).
D. LED Information
Normal Mode: Upon initial power up, the 5 LEDs on The 4555 will begin to function as follows:
Note: During the 3 second “settling” time after power-up, all of the LEDs will be lit to
indicate the startup sequence is in progress.
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All-In-One 4-Zone Fire Panel With Built-In
Primary GSM Cellular Communicator
1. Power (LED 1)
i. AC present – GREEN ON. This indicates that AC power is present and able to power
the logic and the radio (> 10V) but not necessarily high enough to charge the battery (>18V). If
Battery voltage is low (<=20.4V) or the battery is missing, RED ON will be displayed. The
Battery voltage must reach the minimal level (22.8V) for the LED to restore.
ii. Switched to battery power – SLOW FLASH GREEN if Battery voltage >20.4V,
SLOW FLASH RED if <= 20.4V.
iii. No power - OFF
2. TELCO (LED 2)
i. Dialer on-hook, TELCO line present – GREEN ON
ii. Dialer o-hook, TELCO line present - GREEN SLOW FLASH
iii. TELCO missing or disabled – RED ON
iv. TELCO is o-hook, TELCO line present - RED SLOW FLASH
v. Dialer Trouble - if the dialer fails 8 (a programmable value) times or if the TELCO line is
disconnected after the dialer goes o-hook to forward a message - alternate RED/GREEN
FLASH and the Sounder is activated. Pressing the push-button shuts o the sounder and
clears the LED RED/GREEN FLASH. If the external push button is not pressed, the Dialer
Trouble LED2 alert is cleared when the next dialer message is successfully transmitted.
Note:
The only way to silence the sounder is to press the push-button.
3. TROUBLE (Alarm) (LED 3)
i. All of the Zone Inputs are NORMAL and there are no Troubles - GREEN ON
ii. One or more of the Zone inputs are OFF-NORMAL - RED ON. This may either indicate a re
alarm, or some other kind of alarm or trouble depending on how the Zone has been mapped.
iii. A Trouble Event has been declared - RED FAST FLASH
1. This coincides with annunciation of the on-board buzzer
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iv. A Trouble has been silenced via the push-button - RED/GREEN FLASH
Notes:
1. If one or more inputs are set OFF NORMAL, the RED ON supersedes the
TROUBLE indicator.
2. Once the OFF NORMAL has been cleared, the device must restore the TROUBLE event
states until they, too, are cleared.
3. If the LED is RED/GREEN FLASH and a new TROUBLE is detected, the on-board buzzer
will activate and the LED will transition to RED FLASH.
4. Wireless Communication (LED 4)
i. Registered on the wireless network – GREEN ON
ii. Communicating with the Uplink Backend – GREEN FLASH
iii. Not registered on the GSM Network – RED ON
5. Heartbeat (LED 5) and Unit Disabled from the Web
i. 1 second heartbeat indicating the software is operating - GREEN FLASH (ON 0.1 second,
OFF 1.9 seconds)
ii. If the unit is disabled from the Web - RED FLASH.
iii. If unit is in the push-button initiated 5 second display Location Mode, it will be OFF.
iv. If push-button is held for > 5 seconds, the 4555 switches to Zone Status Mode, indicated by a
rapid GREEN FLASH of LED5.
Location Mode: At any time, after a single push button press and for a period of 5 seconds
thereafter, LED1, LED2, LED3, and LED4 are temporarily re-assigned. This is to aid in diagnosing
the event causing the TROUBLE/ALARM without the need to log into the Uplink website. However,
more complete information will always be available on the website.
1. Input Zone Troubles are shown on LED1.
2. 24V Supervised Trouble is shown on LED2
3. GF Detection is shown on LED3
4. Any other TROUBLE is shown on LED4
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