RTK 725B Series User manual

INM725B 725B Instruction Manual – Rev 21
Page 1 of 124
725B Series ALARM ANNUNCIATOR
INSTRUCTION MANUAL
REV DATED DESCRIPTION AUTHOR APPROVED
17 06-12-11 Added Additional functionality D.Adams P.Cartmell
18 12-01-12 Added Enhanced Comms Option D.Adams P.Cartmell
19 25-05-12 Added more detail on IEC61850 D.Adams P.Cartmell
20 16-09-13 Advice on lifting and external PSU type A Ibbetson P.Cartmell
21 13-10-14 Update to safe operating instructions J. Cooke D. Fishkin
725B Series Alarm Annunciator

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SECTION 1 - INTRODUCTION .................................................................... 6
General ...........................................................................................................................6
Programmable Features..................................................................................................6
Glossary of Terms...........................................................................................................7
Annunciator Model Code Definition .................................................................................8
Product Overview..........................................................................................................10
System Front View ........................................................................................................10
Window Illumination.......................................................................................................11
Window Colours ............................................................................................................13
Adding or Changing Film Legends ................................................................................13
Filter & Bezel Spare Parts Numbers..............................................................................14
Laser Printed Legends ..................................................................................................14
Window Numbering System ..........................................................................................14
Integral Pushbutton Module...........................................................................................15
Watchdog Monitoring LED’s..........................................................................................15
USB Programming port .................................................................................................16
CAL Mode .....................................................................................................................17
Signal Input Contact Status...........................................................................................18
Configuring Alarm Inputs for use with N/O or N/C field contacts....................................18
Remote Pushbutton Module..........................................................................................20
Audible Alarms..............................................................................................................20
SECTION 2 – CELL TYPES....................................................................... 21
A Cell Detail...................................................................................................................21
A Cell - Differential Input Version...................................................................................22
AR Cell Detail................................................................................................................23
AR Cell - Differential Input Version................................................................................24
AP Cell Detail................................................................................................................25
APR Cell Detail..............................................................................................................26
AP6 Cell Detail..............................................................................................................27
AWR Cell Detail.............................................................................................................28
AS Cell Detail................................................................................................................29
AS Cell - Differential Input Version ................................................................................30
S Cell Detail...................................................................................................................31
SS Cell Detail................................................................................................................32
WR Cell Detail...............................................................................................................33
WRS Cell Detail.............................................................................................................34
WRR Cell Detail ............................................................................................................35
Optional WR Cell Detail.................................................................................................36
WRP Cell Detail.............................................................................................................38
AC Cell Detail................................................................................................................39
APC Cell Detail..............................................................................................................40
C Cell Detail ..................................................................................................................41
WRC Cell Detail ............................................................................................................42
ACE Cell Detail..............................................................................................................44
WRCE Cell Detail..........................................................................................................45
CEC Cell Detail .............................................................................................................46
PCE Cell Detail..............................................................................................................47
USB Programming Port Location...................................................................................48
SECTION 3 – LOGIC SUPPLY & FUSING................................................ 49
Externally Powered Systems.........................................................................................49
SI/O Card Versions........................................................................................................49
Systems using Internal Power Cards.............................................................................50
SI/O Card Versions........................................................................................................50
SECTION 4 – POWER SUPPLY MONITORING ....................................... 51
Power Monitor Relays ...................................................................................................51
Power Monitor LED’s.....................................................................................................51
Setting Inputs for use with 24VDC or 125VDC ..............................................................52
Setting Inputs for use with 24VAC or 125VAC...............................................................52

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Setting Inputs for use with 48VDC.................................................................................54
Setting Inputs for use with 48VAC.................................................................................54
Standard 24VDC Signal Input Wiring.............................................................................55
Optional 24VDC Powered Input Wiring..........................................................................56
Optional 24VAC Signal Input Wiring..............................................................................57
Optional 125VAC Signal Input Wiring............................................................................59
Optional 48VDC Signal Input Wiring..............................................................................60
Optional 48VAC Signal Input Wiring..............................................................................61
Optional Differential Input Version Wiring......................................................................62
SECTION 6 – COMMON RELAYS............................................................. 63
Group Relay..................................................................................................................64
Group Relay with Reflash..............................................................................................65
Pushbutton Follower Relay............................................................................................65
Diagnostic / Watchdog Relay.........................................................................................65
All Faults Monitoring......................................................................................................65
Field Contact Monitoring................................................................................................65
System Fault Monitoring................................................................................................65
Communication Failure Monitoring................................................................................65
Power Failure Monitoring...............................................................................................65
Card Fault Monitoring....................................................................................................65
Ground Fault Monitoring................................................................................................66
LED Failure Monitoring..................................................................................................66
GPS Monitoring.............................................................................................................66
Printer Fault Monitoring.................................................................................................66
Real Time Clock Fault Monitoring..................................................................................66
SECTION 7– INDIVIDUAL CHANNEL REPEAT RELAYS ....................... 67
Input Follower................................................................................................................67
Logic Follower...............................................................................................................67
Display Follower............................................................................................................68
Cancel System Test Relay ............................................................................................68
SECTION 8 - TYPICAL 725B REAR VIEWS............................................. 69
Typical Large Window Version......................................................................................69
Typical Medium Window Version...................................................................................70
Typical Small Window Version ......................................................................................71
SECTION 9 - INSTALLATION.................................................................... 72
Unpacking .....................................................................................................................72
Basic principles of handling...........................................................................................72
Mounting .......................................................................................................................72
Panel Mounting .............................................................................................................73
Annunciator depth .........................................................................................................73
19” Rack Mounting ........................................................................................................74
Wall Mounting................................................................................................................74
Floor Standing...............................................................................................................74
SECTION 10- SPECIFICATIONS............................................................... 75
Environmental Specifications.........................................................................................76
Temperature..................................................................................................................76
Radiated RFI Immunity..................................................................................................77
Conducted RFI Immunity...............................................................................................77
Radiated Emissions.......................................................................................................77
Conducted Emissions....................................................................................................77
Radiated Power Frequency Magnetic Field...................................................................77
ESD Effects...................................................................................................................77
Surge Withstand – Oscillatory .......................................................................................77
Electrical Fast Transient/Burst Immunity .......................................................................77
Surge Immunity.............................................................................................................77
Low Voltage Directive....................................................................................................77
Approvals ......................................................................................................................77

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SECTION 11 - SPARE PARTS LIST ......................................................... 78
Four Channel Alarm Cards............................................................................................78
24V / 125V Signal Input Versions..................................................................................78
24V / 125V Differential Input Versions...........................................................................78
48V Signal Input Versions.............................................................................................78
48V Differential Input Versions......................................................................................78
Four Channel Repeat Relay Card .................................................................................78
Common Relay Card.....................................................................................................78
White LED Assembly.....................................................................................................79
SI/O Card (For use with remote Pushbutton Module)....................................................79
Ground Detector Card...................................................................................................79
USB Programming Cable ..............................................................................................80
Bezels ...........................................................................................................................80
Clear Lens.....................................................................................................................80
Spares Kits (External Power Supply Version)................................................................80
Spares Kits (Internal Power Supply Version).................................................................80
SECTION 12- SERVICING......................................................................... 81
Module Removal ...........................................................................................................81
Connected Equipment...................................................................................................82
Card Address Setting ....................................................................................................83
Small Window versions .................................................................................................84
Medium Window versions..............................................................................................85
Large Window versions.................................................................................................86
Typical Alarm Card DIL Switch SW1 Address Settings..................................................87
SECTION 13 – CONTACT / RETURNS..................................................... 88
Procedures for Factory Repair and Return Warranty.....................................................88
SECTION 14 – COMMUNICATIONS OPTIONS........................................ 89
Entry Level Versions......................................................................................................89
Standard Comms Version .............................................................................................90
Enhanced Comm’s Version...........................................................................................93
Protocols.................................................................................................... 94
MODBUS.......................................................................................................................94
Modbus Slave – Entry Level..........................................................................................96
Modbus Slave – Standard Communications..................................................................99
Modbus Master – Standard Communications..............................................................109
RTK AMS ....................................................................................................................111
Wharton Format ..........................................................................................................111
Mapping ......................................................................................................................112
IEC61850 Server.........................................................................................................118
SNTP Client.................................................................................................................120
SECTION 15– Standard Comm’s Card Detail....................................... 121
Real Time Clock..........................................................................................................122
SECTION 16 – Enhanced Comm’s Card Details .................................. 123
Real Time Clock..........................................................................................................123

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The following methods are used in this manual to alert the user to important
information:-
WARNING!
Warnings are provided for safety and MUST be followed
CAUTION
Cautions are provided to prevent damage to the instrument.
NOTE
These are used to give general information to ensure correct operation.

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SECTION 1 - INTRODUCTION
General
The RTK 725B Series alarm annunciator is used to inform the operator that a
process has gone beyond set limits using visual and audible alarms.
The Annunciator is manufactured from universal cells which can be
assembled in an array to provide the number of rows and columns required to
suit individual panel designs. Each cell within the annunciator is able to
contain either:- one large, two medium or four small alarm windows and the
window is illuminated by “plug-in” universal white LED’s assemblies providing
a maintenance free solution, a reduction in power consumption and lower
heat dissipation.
Large, Medium & Small Window Sizes
Programmable Features
The 725B is equipped with a host of customer selectable features which can
be accessed via a USB programming port located behind the pushbutton face
plate. Once connected to a PC running the RTK supplied configuration
software the user can enable or disable pre-defined functions as required.
Selection of features is on a per channel basis with no special tools or
programming knowledge required.
The Pushbutton assembly can be used to view the dynamic state of all signal
inputs and to set the non alarm state of each alarm to normally open or
normally closed as detailed in later sections.

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Glossary of Terms
Cell: A single module 60mm x 60mm which can be joined to adjacent
cells in varying heights and widths to provide the number of
alarms required. The number of alarms available per Cell
depends on the window size required.
N/C: A Normally Closed contact which opens in the abnormal state.
N/O: A Normally Open contact which closes in the abnormal state.
EN: Energised Relay Coil that De-Energises in the abnormal state.
DE-EN: De-Energised Relay Coil that Energises in the abnormal state.
Form A: Normally Open Single Pole, Single Throw Relay (SPST) contact
that closes in the abnormal state.
Form B: Normally Closed Single Pole, Single Throw Relay (SPST)
contact that Opens in the abnormal state.
Form C: Changeover contacts, Single Pole, Double Throw (SPDT)
contact both poles change in the abnormal state.
FCV: Field Contact Voltage. (Wetting Voltage)
Card: Refers to individual electronic circuit boards. There are various
types of Cards used within the 725B i.e. Alarm Cards, Relay
Cards, Supply Cards and Communication Cards.

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Annunciator Model Code Definition
Code Description
Model No
B Series 725B
Window Size
S Small – 30 mm w x 30mm h
M Medium – 60mm w x 30mm h
L Large – 60mm w x 60mm h
I Intermixed – combinations of the above as required
Cells Wide
1 – G 1 = 1 cell wide to 9 = 9 cells wide
A = 10 cell wide to G = 16 cells wide
Cells High
1 – G 1 = 1 cell high to 9 = 9 cells high
A = 10 cell high to G = 16 cells high
Pushbutton Module
X Not fitted
P Integral
R Remote TAR
Number Of Active Alarms
0 Hundreds
3 Tenths
2 Units Example shown = 32 ways
Repeat Relay Facility
X Not fitted
R Single repeat relay per channel
D Dual repeat relay per channel
C Repeat relays powered by signal voltage
Integral Power Supply
X Not fitted
U Universal Input Power Supply – 85 to 264VAC OR 88 to 300VDC
S Universal Input Power Supply with SMR (Supply Monitor Relays)
D Redundant Universal Input Power Supplies
-
85 to 264VAC OR 88 to 300VD
C
M Dual Redundant with SMR(Supply Monitor Relays)
Signal Input Type
A 24v standard FCV
B 48v standard FCV
C 125v standard FCV
D n/a
E 24v diff inputs FCV
F
48v diff inputs FC
V
G 125v diff inputs FCV

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H n/a
I Intermixed cards
Tropicalisation Coating
X Not Required
C Tropicalised
Ground Detection
X Not Fitted
G Internal Ground Detection card fitted
Additional Remote Pushbutton Inputs (3 per card)
X Not Fitted
1 – A 1 = 3 x additional remote pushbutton Inputs fitted to
9 = 27 x additional remote pushbutton Inputs fitted
A = 30 x additional remote pushbutton Inputs fitted to
Common Relay Cards (4 per card)
X Not Fitted
1 – 7 1 = 4 x additional common relays fitted to
7 = 28 x additional common relays fitted
Time Stamping
X Not Fitted
T Time stamping of alarms enabled
Synchronisation Card
X Not Fitted
S Sync Card fitted for use with a remote GPS or IRIG B Signal
Communication Hardware
X Not Fitted
E Entry Level – Addressing each alarm card individually
S Standard – RS485 and Ethernet (SNTP only)
A Enhanced – RS485, Ethernet, Additional Ethernet Port
Protocol Options
X Not Fitted
1 RTK AMS (Entry Level), Serial Modbus and AMS(Standard)
2 Serial Modbus RTU (Entry Level)
3 DNP3 Unarmed (Enhanced)
4 IEC61850 Unarmed (Enhanced)
5 IEC61850 (Enhanced)
Special Options
X Not Fitted
1 – Z Reserved for Special Options

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Product Overview
The 725B is a modular alarm annunciator constructed from 60mm x 60mm
cells to form a single unit suitable for mounting in a panel cut-out. This
modular design allows units to be constructed in vast range of heights and
widths to suit individual panel designs and allows systems to be supplied from
a single alarm to a maximum of 256 alarms per annunciator.
System Front View
Typical Small Window Version
Typical Medium Window Version
Typical Large Window Version

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Number Of Alarms Per Cell
Each 60mm x 60mm cell within the annunciator can contain 1, 2 or 4 alarms
depending on the required window size:-
Window Style Window Size (W x H) Alarms per Cell
Large 60mm x 60mm 1
Medium 60mm x 30mm 2
Small 30mm x 30mm 4
If requested at the time of order the unit can be supplied with intermixed
window sizes in any combination
Integral Pushbutton Location
When viewing the front of the annunciator the bottom right hand corner is
normally reserved for the integral pushbutton module.
If advised at the time of order the following alternatives are available
1. The integral pushbutton module can be placed in any cell within the
annunciator.
2. The integral pushbutton module can be replaced with active alarm
channels and remote pushbuttons can be used to control the alarm
annunciator.
3. The Pushbutton assembly can be supplied as a remote assembly
which can be interconnected with the annunciator via a factory supplied
ribbon cable
Window Illumination
Each channel is illuminated by white “Plug-In” LED’s which offer a
maintenance free solution, lower heat dissipation and lower power
consumption. Each LED assembly is equipped with 2 pins that allows it be
“plugged” into the 2 pin socket in the cell behind each alarm window.
CB7028-0
RTK
POLARITY
MARKING
FRONT VIEW SIDE VIEW
725B CELL PINS

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Please note the CB7028POP1 white LED assembly is factory fitted with the
half circle in the top left hand corner as shown above.
If the LED assembly is inserted while power is applied to the system the LED
may blink when it is first inserted but will automatically return to the off state if
no alarm is present.
If it is inserted upside down, no damage will occur but the LED will not
function.
WARNING!
Installation, configuration and maintenance of this annunciator must only be
performed by competent service personnel
WARNING!
Hazardous voltages may exist on the LED assembly connections
accessed via the front bezel. Take care and use insulated tools to
remove and replace LED assemblies.
To remove the LED assembly a pair of insulated pin-nosed pliers can be used
on the sides of the circuit board to gently pull the assembly towards you.
The number of LED’s required per window is governed by the window size.
Small window versions use a single LED assembly
Medium window versions use two LED assemblies
Large window versions use four LED assemblies
LED Failure Indication
The 725B is equipped with LED monitoring to provide indication of total loss of
indication to a channel using the Watchdog, WD, LED mounted on the face of
the Pushbutton Module or the software diagnostic facility as described later in
the manual. As an option a common relay can be used to provide remote
indication of LED failure if required.

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Window Colours
Each channel is equipped with its own removable lens assembly, which,
contains a coloured filter and a laser printed film legend.
White filters are used in standard applications but coloured filters can be used
as an alternative to provide a clear indication of alarm type.
For example Red can be used for trip alarms, amber for pre-alarms and green
for status. A choice of Six colours are available:- White, Red, Amber, Yellow,
Green or Blue.
Adding or Changing Film Legends
WARNING!
Installation, configuration and maintenance of this annunciator must only be
performed by competent service personnel
Each lens assembly has a small slot in the upper ridge of the surround bezel,
which allows a flat blade terminal screwdriver to be used to gently lever the
assembly from the annunciator.
Once the assembly has been removed the lens, coloured filter and film legend
can be accessed by gently pushing outwards on the side of the inside face of
the bezel to allow the lens to clear the associated moulding tabs.
TAHH-32A
TEMPERATURE
ALARM
HIGH-HIGH
COLOURED FILTER
FILM LEGEND
SLOT TO LEVER
THE BEZEL OUT
BEZEL
LENS

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Filter & Bezel Spare Parts Numbers
Part Small Window Medium Window Large Window
Bezel ML-7227-S ML-7227-M ML-7227-L
Clear Lens ML-7228-S ML-7228-M ML-7228-L
Red filter ML-7229-S-RD ML-7229-M-RD ML-7229-L-RD
Amber filter ML-7229-S-AM ML-7229-M-AM ML-7229-L-AM
Yellow filter ML-7229-S-YW ML-7229-M-YW ML-7229-L-YW
Blue filter ML-7229-S-BL ML-7229-M-BL ML-7229-L-BL
Green filter ML-7229-S-GN ML-7229-M-GN ML-7229-L-GN
Laser Printed Legends
Film legends can be easily created in a style, size, font and language using
Microsoft Excel or the RTK supplied configuration software.
Once the legend details have been entered they can be laser printed onto
overhead transparency film and placed between the clear front lens of the
window assembly and the associated coloured filter as shown above.
Window Numbering System
RTK have adopted the following window numbering system to aid with the
location of the film legend and the associated alarm cards.
This method is used to ensure that the legend matches the functions selected
for the designated alarm.
2
15
6
4
3
RESETMUTE
SYST
TEST FIRST
RESET
LAMP
TEST ACK ACK
FIRST
RESET
SYST
TEST
MUTE
LAMP
TEST
RESET
FIRST
RESET
3
2
1
SYST
TEST
LAMP
TEST
MUTE
ACK
RESET
12
43
56
8
7
910
11 12
Large Window Version Medium Window Version Small Window Version
WD
COM
PWR
FC WD
COM
PWR
FC WD
COM
PWR
FC

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Integral Pushbutton Module
On standard systems the pushbutton / programming module is located in the
bottom right hand corner of the annunciator when viewed from the front.
If advised at time of order the pushbutton module can be located in any
alternative cell within the annunciator.
Pushbuttons
Six Pushbuttons:- Lamp Test, Systems Test, Mute, Ack, Reset and First
Reset, are available to allow the user to control any of the customer
selectable ISA sequences.
Some users prefer to lock out specific pushbutton functions and any of the
integral pushbuttons can be disabled in software.
A typical example is first reset where the user prefers to use a remote key
switch to reset the first up indication in place of the integral pushbutton.
Watchdog Monitoring LED’s
As alarm annunciators are used in safety critical applications it is important
that that the functions of the annunciator are also monitored and the 725B is
equipped with an extensive self diagnostic facility and four green status LED
bars are used to provide dynamic monitoring of logic power, field contact
supply, watchdog and communications states.
The LED’s indicate
1. PWR = 24VDC logic power to individual cards
2. FC = Field contact power & contact loop resistance monitoring
3. COM = Communications
4. WD = Watchdog monitoring of individual cards
When power is initially applied to the unit the four green LED bars illuminate in
a rotational sequence whilst the system verifies that all of the expected cards
are present and once the start up routine is complete the LED’s stay ON if all
functions are fully operational.

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USB Programming port
WARNING!
Installation, configuration and maintenance of this annunciator must only be
performed by competent service personnel
WARNING!
Hazardous voltages may be present when pushbutton panel is removed.
Take care not to touch any exposed parts on pushbutton panel or
annunciator beyond those specified in the instructions below.
A small flat blade screwdriver can be used to gently ease the top edge of the
pushbutton face plate out which allows access the USB programming port
which can be used to:-
1. Upload a configuration from an existing 725B
2. Download a configuration to the 725B
3. View diagnostic data whilst fault finding.
Once the user connects the supplied cable between a PC and the USB
programming port the four green LED bars on the front of the pushbutton
module will flash in unison to indicate that the port is being used.
Tx and Rx Status LED’s are provided to indicate any communication activity
between the 725B and host PC.
Full details of programming are provided in later sections of this manual.
USB Port
Rx Status LED Tx Status LED

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CAL Mode
WARNING!
Installation, configuration and maintenance of this annunciator must only be
performed by competent service personnel
WARNING!
Hazardous voltages may be present when pushbutton panel is removed.
Take care not to touch any exposed parts on pushbutton panel or
annunciator beyond those specified in the instructions below.
The 725B unit can be placed into CAL mode which allows the user to view the
dynamic status of the associated plant inputs or the user can use the
pushbutton module to set the non alarm state of each alarm (N/O or N/C).
To place the unit into CAL mode the CAL switch needs to be pushed down in
the direction of the arrow as indicated above.
Whilst in CAL mode the PWR / COM LED bars flash followed by the WD / FC
LED bars and this sequence cycles until the cal switch is turned off.
Please note whilst in CAL mode the pushbuttons have alternative functions
and the CAL switch must be in the OFF mode for the normal pushbutton
functions to operate correctly.
If an alarm occurs whilst in CAL mode the audible will sound and once the
user places the switch back to normal the alarm will be displayed in the
normal way.
Push Down For CAL Mode

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Signal Input Contact Status
During commissioning or fault finding the user can easily determine the
current status of all of the plant inputs connected to the alarm annunciator by
placing the unit into CAL mode.
Once in this mode each window on the 725B indicates the dynamic status of
the associated plant input.
If the alarm window is OFF the associated plant input is OPEN
If the alarm window is ON the associated plant input is CLOSED
Please note: The OPEN and CLOSED indication refers to the customer’s field
contact and is not related to the non alarm state set in the annunciator. (N/O
or N/C)
Configuring Alarm Inputs for use with N/O or N/C field contacts
The non alarm state of each alarm channel can be configured in software to
allow the channel to operate from either a N/O or N/C contact as described
later in this manual.
As an alternative the integral pushbutton module can be used to set this
function by sliding the CAL switch down to the ON position.
When in CAL mode the function of the integral pushbuttons changes to allow
the user to navigate between channels, select the function and set the
function as detailed below.
Pushbutton Abbreviation Function in CAL Mode
Lamp Test CHDN Channel Down
Ack FDN Function Down
Mute SET Set
Reset SET Set
System Test CHUP Channel Up
First Reset FUP Function Up
The alternative function of each pushbutton is indicated on the inside face of
the pushbutton assembly but it is the pushbutton on the front of the assembly
that is used to physically activate the function.

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Function Up / Down
The integral pushbutton module has two functions.
1. It can be used to dynamically view the status of all signal inputs to
determine which inputs are open or closed.
2. It can be used to set the non alarm state of each alarm channel to N/O
or N/C.
When the unit is first switched to CAL mode it defaults to the contact
monitoring state. If the user wishes to change the non alarm contact state of
any inputs the Function Up (First Reset Pushbutton) must be pressed.
Once the Function Up has been selected the top left hand window flashes to
indicate that the 1st channel is in programming mode and the user can set of
navigate to each channel as required.
Channel Up / Down
The user is able to navigate to the required channel by pressing the System
Test (channel up) to navigate to channel 1 to 2 to 3 etc and Lamp Test
Pushbutton (channel down) to navigate from channel 3 to 2 to 1 etc.
Setting the Non Alarm Input State
Once the user has navigated to the required channel each time the Mute, or
Reset, pushbutton is pressed the input state is inverted from N/O to N/C.
If the status LED is OFF the channel is suitable for use with N/O
contacts.
If the status LED is ON the channel is suitable for use with N/C
contacts.
CAUTION:- This information is only saved when the user navigates to another
channel (up or down). If the user places the CAL switch to the OFF position
without navigating to an adjacent channel the information will not be stored.
Channel Down
Channel Up Function Up
Function Down
SetSet

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Remote Pushbutton Module
As an alternative the 725B can be fully equipped with alarm windows and the
Pushbutton Module can be supplied as a remote item or the user can use
conventional panel mounting momentary, N/O, pushbuttons to control the
annunciator.
In these applications the common watchdog / relay, WR, card part no
CB6641POP2 is equipped with a USB programming port which is located on
the underside of the associated cell. Full details are provided in section 2 of
this manual
Audible Alarms
Two internal audible alarms are provided as standard behind the pushbutton
module for use as critical and non critical audibles.
As standard the audibles provide a steady tone but each horn can be software
selected to pulse if required. The volume of each horn is selectable in
software from 0 to 100% of span and a test volume feature is provided as
described later in the manual. Please note if the pulse option has been
selected the software “test volume” function overrides the pulse feature to
make adjustment simpler.
Each channel can be set in software to activate either of the integral horns.