Cattron Safe-E-Stop PSD User manual

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9M02-8978-A002-EN
Version 14
Safe-E-Stop™
User Guide
SAFE-E-STOP™
Personal Safety System
User Guide
9M02-8978-A002-EN

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Safe-E-Stop™
User Guide
Revision History
VERSION
DATE
NOTES
13
1/28/2018
Added cautions, updated Fault finding and simplified frequency selection
14
2/2021
Rebranded

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Contents
1. Introduction ............................................................................................................................................5
1.1 Terminology...................................................................................................................................5
2. Warnings and Cautions..........................................................................................................................6
2.1 MSD wiring warning........................................................................................................................6
2.2 Verification of configuration warning ..............................................................................................7
2.3 Verification of correct linking warning.............................................................................................7
2.4 Placement of PSD in charger warning ...........................................................................................8
2.5 No serviceable parts warning.........................................................................................................8
2.6 Regulatory warning.........................................................................................................................9
2.7 Awareness of PSD range and Hazards around the machine ........................................................9
2.8 The system may cause unexpected stop of the machine ..............................................................9
2.9 The Safety analysis shall consider the reaction time of the system...............................................9
2.10 Ethernet may not be used for safety critical function ....................................................................9
2.11 General Safety Information ...........................................................................................................9
2.12 Intended Use...............................................................................................................................10
2.13 Improper Use...............................................................................................................................10
2.14 Equipment rating warning............................................................................................................11
3. Operating Principle ..............................................................................................................................12
3.1 General........................................................................................................................................12
3.2 Radio Transmission ....................................................................................................................12
3.3 Telegram Security.......................................................................................................................13
4. Frequency Selection............................................................................................................................14
4.1 Rules for Frequency selection.....................................................................................................14
4.2 Site Planning...............................................................................................................................15
5. PSD and MSD Configuration Parameters ...........................................................................................16
5.1 PSD Configuration Detail ............................................................................................................16
5.2 MSD Configuration Detail............................................................................................................17
6. PSD......................................................................................................................................................19
6.1 PSD Overview.............................................................................................................................19
6.2 PSD Status Indications ...............................................................................................................19
6.3 Joining an E-Stop Group.............................................................................................................21
6.4 Normal Operation........................................................................................................................23
6.5 Leaving an E-Stop Group............................................................................................................24
6.6 Switching OFF the PSD ..............................................................................................................24
6.7 Charging the Battery ...................................................................................................................24

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6.8 PSD Belt Clip...............................................................................................................................25
7. Battery Chargers..................................................................................................................................26
7.1 General Information ....................................................................................................................26
7.2 Caution........................................................................................................................................26
7.3 Single Bay Charger.....................................................................................................................27
7.4 Six-Bay Charger..........................................................................................................................27
7.5 Battery Charger Status and Indicators........................................................................................28
8. MSD.....................................................................................................................................................29
8.1 MSD Overview ............................................................................................................................29
8.2 MSD Connections .......................................................................................................................29
8.3 MSD Status Indicators ................................................................................................................35
8.4 MSD Operational States .............................................................................................................36
8.5 MSD Information and Setup........................................................................................................36
8.6 MSD Ethernet Address Configuration.........................................................................................37
8.7 MSD Operation............................................................................................................................40
8.8 MSD Installation..........................................................................................................................40
9. System Commissioning .......................................................................................................................46
10. System Decommissioning................................................................................................................47
11. Parts Lists.........................................................................................................................................48
11.1 System Part Numbers.................................................................................................................48
11.2 Accessory Parts Lists..................................................................................................................49
12. Maintenance.....................................................................................................................................50
12.1 PSD Maintenance .......................................................................................................................50
12.2 MSD Maintenance.......................................................................................................................50
Appendix I: Part Number Unit Configuration...............................................................................................52
Appendix II: RF Channel Number vs Operating Frequency .......................................................................54
Band B (433-434MHz).............................................................................................................................54
Band D (450-470MHz).............................................................................................................................54
Band F (902-927MHz).............................................................................................................................54
Appendix III: Approvals and Compliance Notifications ...............................................................................56
FCC Caution............................................................................................................................................56
EU Caution ..............................................................................................................................................56
Appendix IV: Troubleshooting.....................................................................................................................57
System.....................................................................................................................................................57
PSD .........................................................................................................................................................58
MSD.........................................................................................................................................................59
Battery Charger .......................................................................................................................................59

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Appendix V: Technical Data and Specifications PSD and MSD.................................................................60
Appendix VI: Technical Data and Specifications Battery Charger..............................................................61
Appendix VII: Safety Manual for Safe-E-Stop.............................................................................................62
Functions.................................................................................................................................................62
Failure Modes..........................................................................................................................................62
Operational Constraints...........................................................................................................................62
Safety Performance Level.......................................................................................................................64
1. Introduction
This manual provides guidance to installers and users of the Cattron Safe-E-Stop Personal Safety
System.
1.1 Terminology
The following represent important acronyms and long form used in this document:
PSD
Personal Safety Device (the unit worn by a machine operator)
MSD
Machine Safety Device (the unit connected into the hard-wired E-Stop wiring and monitoring systems)
PSS
Personal Safety System (the entire E-Stop System)
PLC
Programmable Logic Controller
MASTER-
ADDRESS
The Primary address used by the system to ensure adjacent systems is unique and will not cross talk
SUB-ADDRESS
The appended address used to identify specific PSDs within a system
COMM LOSS
A loss of RF communication between PSD and MSD
LINKING
Associating a PSD with an MSD and placing into operation as an active E-Stop device
UNLINKING
Disassociating a PSD from an MSD and removing from an active E-Stop group
DIN
Deutsches Institut fur Normung, i.e. German Institute for Standardization.
PL
Performance Level
SIL
System Integrity Level
SC
Systematic Capability

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2. Warnings and Cautions
WARNING and CAUTION statements are strategically placed throughout all text prior to operating or
maintenance procedures, practices or conditions considered essential to the protection of personnel or
equipment and property. Before starting any task, review and understand the WARNINGS or CAUTIONS
included in the text. All WARNINGS and CAUTIONS appearing in this manual are included below.
W A R N I N G S Y M B O L
Meaning: CAUTION
Function: Indicates that caution is necessary relative to the associated content and that the current information
must be followed in order to avoid undesirable consequences.
2.1 MSD wiring warning
W A R N I N G
The MSD must be hard-wired in series with at least one E-stop switch so that an e-stop is still available when no
PSDs are connected.
Failure to comply with the above warning may result in serious injury or death to personnel and damage to
equipment.

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2.2 Verification of configuration warning
W A R N I N G
More than one PSD may be used in, around, or nearby your machine; therefore before using any PSD, you
must ensure by checking the configuration ID or other means of identification that the correct unit has been
selected and that it matches the machine being protected.
If the PSD is not associated with the machine you are using it may still link to another MSD on a close by
machine and not be providing the protection you are expecting and need.
Failure to comply with the above warnings may result in no protection being provided to stop your machine,
which in turn could result in loss of ability to stop an impending emergency situation and may lead to injury or
death.
2.3 Verification of correct linking warning
W A R N I N G
After linking the PSD to the machine, there should be a means for the operator to verify the connection; several
methods can be used including color coding, numbering, or by using the ethernet connection with a PLC and
pressing the green button on the PSD and ensuring the indicator (light or buzzer) on the machine confirms your
connection.
Failure to comply with the above may result in no protection being provided to stop your machine, which in turn
could result in loss of ability to stop an impending emergency situation and may lead to injury or death.

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2.4 Placement of PSD in charger warning
W A R N I N G
Unlinked PSDs should not be visible to personnel in the area and potentially confused for an available e-stop
switch. If PSDs in chargers are unlinked they should not be visible. The easiest way to do this is to place the
charger within a secondary enclosure or position it so that the e-stop switch faces toward a wall and away from
personnel.
Failure to comply with the above may result in no immediate available protection being provided to stop your
machine, which in turn could result in loss of ability to stop an impending emergency situation and may lead to
injury or death.
2.5 No serviceable parts warning
W A R N I N G
There are no user serviceable parts in this PSD / MSD system, please return damaged units to Cattron or a
Cattron authorized service centre for service and do not attempt to repair these units.
Unauthorized repairs will void the unit’s safety rating and could compromise the unit’s ability to stop your
machine, which in turn could result in loss of ability to stop an impending emergency situation and may lead to
injury or death.

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2.6 Regulatory warning
W A R N I N G
Observe the statutory regulations and directives applicable for the intended purpose, e.g.:
▪Accident prevention regulations
▪Safety rules and directives
▪Standards
▪Generally applicable statutory and other binding regulations for accident prevention and environmental
protection, and general safety and health requirements.
2.7 Awareness of PSD range and Hazards around the machine
W A R N I N G
The operators and the personnel in general should be trained to know the operational range limits of the PSD
and the surrounding hazards.
2.8 The system may cause unexpected stop of the machine
W A R N I N G
The design of the machine shall consider the risk associated with an unexpected stop of the machine.
2.9 The Safety analysis shall consider the reaction time of the system
W A R N I N G
The safety analysis of the application shall consider the reaction time of the system.
2.10 Ethernet may not be used for safety critical function
W A R N I N G
The ethernet port must only be used for informational purposes. The functionality of green button on the PSD
should must not be used for any safety critical functionality such as restarting the machine.
2.11 General Safety Information
▪Persons under the influence of drugs, alcohol and/or other medicine that impairs reaction may not
install, repair, or operate this product.

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▪All installations must conform to the relevant safety requirements. Only qualified, trained,
authorized personnel may perform work on the equipment, in accordance with the relevant safety
requirements.
▪In the event of malfunction and/or visible defects or irregularities, the operation must be protected
by other PSDs or alternate external means. The PSD/MSD system must be returned to good
working order before being returned once more to operational service.
▪The operating manual should be permanently accessible at the place of product use.
▪Personnel assigned to work with the product must have read and understood the operating
manual and the safety instructions.
▪The safety instructions should be supplemented with work instructions concerning the job
organization, work sequences, qualified personnel, etc.
▪All repairs made during the warranty period must be carried out by the manufacturer or appointed
authorized service center, failure to comply will invalidate the warranty.
▪Only trained personnel may perform maintenance and repair on the product.
▪All repairs made by these authorized agents should be carried out in a suitably clean static-safe
environment, free from contaminants such as metal filings, water, oil etc.
▪It is the user’s responsibility to ensure that the product is maintained in good condition and that all
applicable safety requirements and regulations are observed.
▪Product modifications may not be carried out.
▪Only original spare units from Cattron must be used.
▪Periodical inspections either required by law or prescribed in this user manual shall be carried out
within the prescribed intervals.
2.12 Intended Use
Only use the product in good condition, by trained personnel, and subject to the compliance with the
applicable operating safety and accident prevention rules and regulations.
2.13 Improper Use
Certain use and work on / with the product is not permitted, in particular:
▪Deviating from the voltage / frequency data on the type plate
▪Working on live components
▪Insufficient maintenance
▪Failure to observe the operating temperature range

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2.14 Equipment rating warning
C A U T I O N
Damage of the device
The PSD is rated at IP67 and an operating temperature range of -20°C to +60°C; do not use the PSD for
conditions beyond these limits.
The PSD battery cannot be charged if its temperature exceeds 40°C.
The MSD is rated at IP30 and a temperature range of -20°C to +60°C, up to 90% non-condensing RH, for
environments harsher than this use an appropriate secondary enclosure.
Exceeding these ratings could compromise the unit’s ability to stop your machine, which in turn could result in
loss of ability to stop an impending emergency situation and may lead to injury or death.
C A U T I O N
The choice of connection will be determined by the safety level required for the target application and machine.
To achieve SIL3 capable safety levels a dual channel connection approach will be required and is
recommended, but single channels are optional for lower safety levels and are also illustrated.
Additionally, it must be remembered that the Ethernet port is not safety critical, only informational, therefore
the functionality of the green button on the PSD should not be used for safety critical functionality such as
restarting the machine.
Use of the green button for safety critical functions could result in unexpected actuation of function and may
lead to injury or death.

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3. Operating Principle
3.1 General
The MSD has two safety relays that are wired in series with an external hard-wired E-Stop circuit that
provides a machine with the ability to run. The MSD safety relays are normally open types: if the MSD
power were removed, the relays would open and the machine would be brought to a halt as though an E-
Stop had been pressed.
The MSD is a complex safety PLC. In the event of any fault it will open its safety relays; in its normal
operating mode, it will maintain these safety relays in a closed state.
A normal operating mode can be maintained in the absence of any online PSD, as well as with one or
more PSDs in a linked and normal operating state.
PSDs can come and go as required without affecting the MSD E-Stop safety relays, provided that the
PSDs join and leave the system by the deliberate act and process of linking and leaving the active group.
(Patent Pending)
When a PSD is part of the active group, it will trigger an E-Stop if it has its E-Stop switch pressed or if it
loses the RF link to the MSD either because a) it goes out of range, b) it shuts down due to low battery c)
it has a fault, or d) it has its RF linked blocked by interference.
Both the MSD and PSDs feature fully redundant hardware and safety critical software. They individually
and jointly meet the safety level of SIL3 according to ISO61508.
The MSD polls the PSDs in turn and assigns a PSD an active slot if one is available. The linked PSDs
return the poll after each MSD poll, forming a closed loop safety system.
3.2 Radio Transmission
The connection between the MSD and PSDs is performed by means of radio communication. With regard
to the actual radio frequency that is used, there are several radio frequency bands available.
A specific RF frequency band and channel is selected prior to delivery of the system.
Depending on the frequency band, a defined number of RF channels are available.
The MSD and PSDs must operate on the same RF channel in order to be able to communicate.
Some systems use two RF channels in a frequency diversity mode to increase immunity to RF
interference.
3.2.1 Continuous Transmission
Once the units are linked, transmission between MSD and PSD must be continuous. The MSD uses this
as part of the information required to maintain its E-Stop safety relays in a closed state. If the MSD does
not receive a valid telegram from a linked PSD after a short time, it turns off the E-Stop safety relays.
In order to ensure optimum communication between the MSD and PSD, operate the PSD with line-of-
sight to the MSD antenna as far as possible. Avoid total shielding of the signal path by extensive metal
and other thick solid obstructions.

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3.2.2 Radio Interference
Signals from other RF-emitting sources might interfere with the radio communication between the MSD
and PSD. If the radio link reliability is affected by interference, changing the RF channel or even the RF
band may be necessary.
3.3 Telegram Security
The transmitted telegram contains several security features.
3.3.1 Frame Type
Each message has an 8-bit message type identifier that is unique to the equipment in use.
3.3.2 System Address
Your Personal Safety System uses 32,768 unique Master Addresses, and 15 Sub Addresses per MSD
(one per each possible associated PSD).
This system address is contained in every telegram sent between the MSD and PSD. The data is
considered valid only when the address combination matches. This is a safety measure to ensure that the
MSD will act only upon its assigned PSDs.
3.3.3 CRC
The telegram is checked for integrity by the use of a 16-bit CRC. Frames containing a mismatched CRC
will be rejected.
3.3.4 Frame Counter
Each message has an embedded frame counter that changes with every data frame. This prevents
frozen data and data frame hacking.

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4. Frequency Selection
Reliable operation of the Safe-E-Stop system is dependent on the correct selection of one or more
interference free RF channels; inappropriate selection may lead to unexpected machine shut down. The
Safe-E-Stop system operating frequency is factory set and cannot be field set, so correct frequency
selection is required prior to the system being built. If the operating frequency needs to be changed after
it has left the factory, it will be necessary to return the PSDs and MSDs to the factory for re-programming.
Depending on your region there may be licensed channels and/or license exempt channels available:
▪Licensed channels provide the greatest level of signal reliability because issuance of channels is
regulated and controlled within the geographic region.
▪License exempt channels are not regulated and hence the onus lies with the user to monitor and
control frequencies in use in their facility, but knowledge of other users that may exist close by is
harder to determine, operation within a steel clad building will provide a level of isolation from
external sources, an open site however may be better off using licensed channels.
It is the user’s responsibility to maintain a frequency plan to ensure interference free operation of the
Safe-E-stop and other RF equipment on site. Selection of an appropriate operating frequency requires
both knowledge of RF channels in use and the application of the rules set out below.
Table 1: Frequency Spacing by RF band
BAND
START FREQ
HZ
END FREQ
HZ
CH SPACING
KHZ
START
CHANNEL
END
CHANNEL
CH,
SPACING
A
418,000,000
B
433,077,500
434,777,500
25
A00
A68
2 (50kHz)
C
447,000,000
D
450,000,000
470,000,000
12.5
A00
Q00
4 (50kHz)
E
868,000,000
F
902,600,000
927,500,000
100
A00
C49
2 (200kHz)
Table 1 defines the six operating bands; currently Cattron have only released the B, D, and F bands.
▪In North America, the D band is licensed and the F band is license exempt.
▪Europe and many other regions including Brazil use the license exempt band B.
4.1 Rules for Frequency selection
1. A channel can be any frequency between the Start Freq. and the End Freq. that is wholly divisible
by the CH Spacing.
−e.g. Band D channel 6 is 450,000,000 + (6*12,500) = 450,750,000.
And for any given frequency;
2. If any other systems (including other Safe-E-Stop systems) are operating within 10m of the
location that the Safe-E-Stop will be used, then a frequency that is at least as far away as is
shown in the ‘CH SPACING Separation’ column should be chosen.
−e.g. If another system is operating on 450,700,000 required minimum separation Table 1 is
50kHz so 450,700,000 –50,000 = 450,650,000 and 450,700,000 + 50,000 is 450,750,000
and both of these are within the Band Start and band End frequencies. Make sure it is a valid
channel according to rule 1 above.
3. Finally make sure the derived frequency is not in the table below.

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Table 2: Frequencies Not Supported
AVOID FREQUENCIES
Band B
Band D
Band F
434,177,500
466,937,500
902,600,000
912,100,000
921,600,000
902,700,000
912,200,000
921,700,000
902,800,000
912,300,000
921,800,000
902,900,000
921,100,000
921,900,000
911,700,000
921,200,000
922,000,000
911,800,000
921,300,000
922,100,000
911,900,000
921,400,000
912,000,000
921,500,000
Cattron can supply support and help with frequency selection if they are provided with a list of frequencies
in use in the immediate operating location.
4.2 Site Planning
As far as is practical RF systems frequency separation should be at least as shown in the last column of
the
table below.
Table 3: Channel Spacing for Adjacent Systems
BAND
START FREQ
HZ
END FREQ
HZ
CH SPACING
KHZ
START
CHANNEL
END
CHANNEL
CH,
SPACING
A
418,000,000
B
433,077,500
434,777,500
25
A00
A68
2 (50kHz)
C
447,000,000
D
450,000,000
470,000,000
12.5
A00
Q00
4 (50kHz)
E
868,000,000
F
902,600,000
927,500,000
100
A00
C49
2 (200kHz)
NB: channels are identified on the equipment by a three digit identity xnn see columns 5 and 6 above.
Channels run A00 through A99, and then B00 through B99 etc. until the End Channel is reached.
For the purposes of adjacent system channel spacing we can use the figure in the final column.
This simplifies somewhat the method of determining what channels should be chosen on a site.
When all available channels have been used, (not likely with 450MHz or 915MHz band) with the
designated channel spacing we can start using intermediate frequencies (1 channel apart) provided that
they are 100m away from the systems 1 channel away.

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5. PSD and MSD Configuration Parameters
The factory set system parameters—include the selected RF Band, Primary RF channel, Secondary RF
channel (if any), System master address, and the PSD specific sub-address.
Each system’s configuration is identified in clear text on its labelling.
A system of one MSD and one or more PSDs must have a correct set of configuration parameters to be
able to operate. Most of the configuration details must match exactly; only the Sub-Address (the first C in
the example below) must be different between PSDs but will be included in the range of Sub-Addresses
that the MSD is capable of using.
In summary:
▪A PSD only has ONE Sub-Address and each PSD must have a different Sub-Address.
▪An MSD has a range of Sub-Addresses.
▪Both PSDs and MSD have a number of other parameters that must match exactly.
5.1 PSD Configuration Detail
Figure 1: PSD Configuration Label
Figure 1 shows the labelling on the PSD. The configuration example identifies this PSD as having a
configuration of D-C23*00-C-CB6A, referring to Table 1.
Band D=450MHz, single channel C23 in that band, Sub-Address C, and Master Address CB6A.

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As an aid to visual identification and differentiation, the following are available as options:
▪A sheet of labels of various colors of Cattron Logo as a user installation item.
▪Differently colored rubber bumpers as a factory installed item.
5.2 MSD Configuration Detail
Figure 2: MSD Configuration Label
Figure 2 shows the labelling on the MSD; the configuration example shown identifies this MSD as having
a configuration of A-23-00-AO-CB6A referring to Table 4.
Band A=418MHz, single channel 23 in that band, Sub-Address range A thro O, and Master Address
CB6A.
In this example, the MSD is capable of operating with the PSD in Figure 1 above because the PSD has a
matching Band, Channel, and Master Address, plus a Sub-Address of C that is within the acceptable
range for this MSD of A through O.

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Table 4: Configuration Parameter Examples
HARDWARE SECTION
EXAMPLES
CONFIGURATION SECTION
EXAMPLES
Version of
MSD/PSD
RF
Band
PSD
Color
1st RF Channel
2nd RF Channel
Sub Address
Master Address
1st
Sub
Band
Chan
dec
Chan
unit
2nd
Sub
Band
Chan
dec
Chan
unit
SAC
Start
SAC
End
MA1
(MSB)
MA2
MA3
MA4
(LSB)
A −Z
A −Z
0 −
99
A −Z
or *
0 −
99
A −O
A −O
0 −E
0 −F
0 −F
0 −F
PSD
1
A
R
A
1
1
*
0
0
A
0
0
0
1
1
B
B
B
1
2
A
0
0
B
1
C
G
C
6
4
B
0
0
C
1
D
O
0
4
2
6
K
C
B
6
A
1
E
R
Y
7
6
Y
0
0
L
1
F
R
Z
9
9
Z
0
0
O
MSD
1
A
A
1
1
A
0
0
A
O
1
B
B
1
2
B
0
0
A
O
1
C
C
6
4
C
0
0
A
O
1
D
0
5
0
0
A
O
1
E
Y
7
6
Y
0
0
A
O
1
F
Z
9
9
Z
0
0
A
O
E
F
F
F
Table 5: Frequency Bands
BAND
FREQ MHZ
TYPICALLY USED IN
A
418
China
B
433
EU & Other
C
447
EU Licensed
D
450
NA and Other Licensed
E
869
EU
F
915
NA
Table 6: Examples of Configuration Number Use
SELLING PART #
FULL CONFIGURATION PART #
ON DEVICE
PSD-1-A-R
MSD-1-A
PSD-1-A-R-D23*00-A-CB6A
MSD-1-A-D23*00-AO-CB6A
A-D23*00-A-CB6A
A-D23*00-AO-CB6A

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6. PSD
6.1 PSD Overview
PSDs can be considered as a set of wireless E-Stop switches that are dynamically linked to the MSD on
an as-needed basis. The MSD does not need a PSD to be connected in order to keep its E-Stop Safety
Relays closed; as long as power is connected to the MSD and it has no faults, these relays are held
closed and the hard-wired E-Stop circuit is maintained.
The MSD provides the physical link into the hard-wired E-Stop system of the machine. Its E-Stop Safety
Relays are wired in series with this circuit and reflecting the status of the PSDs E-Stop switches.
Up to five out of a total of fifteen PSDs can be linked to an MSD at any one time.
If a PSD is linked to the MSD, the MSD E-Stop Safety Relays are then also subject to additional rules
relating to the RF communication link between the PSD and MSD being uncorrupted and continuous, as
well as the PSD E-Stop switch remaining out.
Corruption / loss of the RF link or an E-Stop switch being pressed will open the MSD E-Stop relays.
Corruption / loss of the RF link will also open the COMM LOSS relays.
A controlled process is in place to enable PSDs to link to and unlink from the MSD.
6.2 PSD Status Indications
PSDs have audible, visual (LED and LCD) and haptic (vibration) warning systems to indicate the current
status such as normal operation, low battery, low RF signal etc.
Figure 3: PSD Indications

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9M02-8978-A002-EN
Version 14
Safe-E-Stop™
User Guide
6.2.1 PSD LEDs
Referring to Figure 3 above, there are four LEDs above the E-Stop switch. These are:
STATUS
This will be flashing:
GREEN:Normal operation
ORANGE:Conditions that require the user to be aware
RED: Conditions that require the user to take corrective action
COMM LOSS
Illuminates RED if this PSD loses communication
Illuminates ORANGE if another PSD loses communication
LOW BATTERY
Illuminates RED when the battery requires charging
ERROR
Illuminate in case of internal error
6.2.1.1 PSD LCD
The LCD provides valuable information to the user. A backlight turns on each time there is a change of
displayed message and the backlight will remain on for 10 seconds.
6.2.1.2 Radio signal level Monitoring
The RF signal level is monitored and displayed on the PSD using a graphic icon, as shown in Figure 4.
More bars mean more signal. Very low signal will be accompanied by the icon flashing.
Figure 4: RF Signal Level Monitoring
6.2.1.3 Battery Monitoring
The estimated battery level is monitored and displayed on the PSD by using a graphic icon and time in
hours, as shown in Figure 5.
Resolution is approximate and shown within 0.5 hour increments; accuracy may vary under some
conditions such as low temperature.
The icon flashes when the battery charge state is very low.
Note that if the low battery LED illuminates, this indicates an imminent shut down due to low battery
regardless of the hours shown on the LCD.