LEGRAND 0 766 22 User manual

INSTALLATION AND USER GUIDE
SECURE WANDERING
SYSTEM
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2 INSTALLATION PRINCIPLE
2 System description
3 DEVICE PRESENTATION AND
INSTALLATION
3 Secure wandering device
6 Secure wandering system - auxiliary elements
7 STANDALONE INSTALLATION
7 Example of installation
9 Wiring - controllers and antennae
10 Operating modes
11 SYSTEM INSTALLATION
11 Example of installation
13 Wiring - controller/antennae and door unit
14 Operating modes
15 COMMISSIONING
15 Factory settings
16 Settings
18 Adjusting the antennae
19 OPERATION
19 Operation in day mode (surveillance)
20 Operation in night mode (intruder)
21 Illuminated and audible signals
22 CHARACTERISTICS
22 Specifications
23 USAGE CODES
23 Control code
24 CONTROLLER CONFIGURATION
24 Checking the controller parameters
Contents

2
CONTENTS
Functionality
The secure wandering system is a system which allows
any potential escape attempts by confused patients to
be controlled.
Each exit under surveillance is fitted with a standalone
controller which alerts staff when a person wearing
a special wristband tries to go through it. In the event
that there are no supervisory staff near the exit, this
information can be transmitted to the BUS/SCS nurse
call unit using a door unit Cat. No. 0 766 06 configured
for this function. This way nurses are immediately
alerted to the escape and which door they have
gonethrough.
The system can operate using two modes:
• Surveillance mode: An alarm is activated when the
wearer of a wristband is close to the exit and this exit is
open.
• Intruder mode: An alarm is activated when an exit
isopened.
Switching from one mode to the other can be done
manually by entering a special code into the controller
keypad or by closing a clock contact.
The staff have a chaperone code which allows a
wristband wearer to be let through an exit under
surveillance without triggering an alarm.
Two control outputs allow:
• The exit to be locked once a wristband is detected
in the vicinity (provide an electromagnetic lock or an
electric door release).
• An audible or illuminated warning signal to be
triggered when an escape alarm is activated.
Safety instructions
This product must be installed in accordance with the
installation instructions, and preferably by a qualified
electrician. Incorrect installation and use may lead to
the risk of electric shock or fire. Read the manual and
consider exactly where the product is to be fitted before
carrying out installation.
Do not open, remove, alter or modify the device
unless this is specifically stated in the instructions.
Legrand products must only be opened and repaired
by personnel trained and authorised by Legrand.
Any unauthorised opening or repair voids all liability,
replacement rights and warranties.
Only use Legrand brand accessories.
Operating environment
- This device complies with the directives concerning
exposure to radioelectric frequencies when used
under the normal conditions described in the user
manual. Follow the installation instructions described in
themanual.
- Depending on the configuration, this device regularly
transmits radio waves, the frequency and power of
which comply with ARCEP recommendations.
SYSTEM DESCRIPTION
Installation principle

3
CONTENTS
Device presentation and installation
SECURE WANDERING DEVICE
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Situated close to the exit door, this controller is the
heart of the system.
All auxiliary elements are connected to it.
A 12-button keypad is used to configure it and
activate special functions (mode changes, alarm
acknowledgement, etc).
Buzzer and LEDs act as a warning if an escape
is detected. The buzzer makes a different sound
depending on the type of alarm (chaperone or fault).
The indicators show the system status simultaneously.
It can be suppressed.
The controller has a built-in antenna and can retrieve
information from the antenna Cat. No 0 766 21 and
door contact Cat. No. 0 431 00.
Depending on its usage mode, the controller:
- Buzzes and flashes
- Can lock the door if it has the necessary fitting
(electromagnetic lock, door release)
- Can trigger a nurse call if connected to the door unit
- Can send a message to the DECT
When the door is locked, it can be unlocked using
special codes.
The coded keypad picks up the wristband signal when
a resident passes through a predefined door.
Requires a modular 12 V=power supply
(Cat.No.4131 05).
Indicates that a door has been crossed by a resident fitted with a wristband Cat. No. 0 766 20.
Works with door unit Cat. No. 0 766 06 configured for secure wandering which allows acknowledgement and
feedback to the Legrand SCS nurse call unit system.
Door controller Cat. No. 0 766 22 Technical characteristics
• IP 20 - IK 04
• Operating temperature:
0°C to +50°C
• Power supply:
- 12 V=
- 150 mA
• Illuminated signals:
- System power on (status LED)
- Intruder mode (detection LED)
- Wristband detection (detection LED)
• Audible signals:
- Alarm
- Alarm suppressed by chaperone code
• Functions which can be accessed via the keypad:
- Reset alarms
- Chaperone
- Changeover between surveillance/intruder modes
- System parameter settings
• Controller inputs:
- Adjustable connection
- Volt-free contacts
- Voltage detection
5-24 V=
50 mA to 24 V=
- Door contact (NO/NC)
- Chaperone contact (NO)
- Alarm acknowledgement (NO/NC)
- Mode selection
- Panic alarm (NO)
• Volt-free contact outputs:
- Lock: 1 A - 24 VA/60 V=max
- Alarm: 1 A – 24 VA/60 V=max
• Internal antenna (15W30 -->)
• Cable type for link with door unit (system solution):
2 x 0.9 mm pairs
1Bracelet activation
magnet
2Detection LED (orange)
3Status LED (green)
4Code keypad
5Enter key
6Cancel key
7Buzzer

4
CONTENTS
Device presentation and installation (continued)
Used in the case of wide doors, double doors, placed as close to the exit as possible, ideally 50 cm from the
ground, opposite the controller. This antenna picks up the radio signal from a wristband Cat. No. 0 766 20 and
informs the controller Cat. No. 0 766 22.
The detection radius (around 1 to 15 m) can be set easily using a screwdriver.
A green indicator light indicates that the antenna power is on.
A red indicator light flashes when a wristband is in the detection zone (see setting the antenna).
The antenna activity is permanently checked by the controller.
Technical characteristics
• Power supply: via door controller Cat. No. 0 766 22
• Dimensions (H x W x D): 50 x 100 x 40 mm
• Screwed onto the wall
• IP 20 - IK 04
• Operating temperature: +0°C to +50°C
• Cable type (to controllers 0 766 22):
2 x 0.9 mm pairs
Antenna Cat. No. 0 766 21 (additional antenna)
SECURE WANDERING SYSTEM (CONTINUED)
1
2
1Status LED (green)
2Detection LED (red)

5
CONTENTS
Wristband Cat. No. 0 766 20
Worn on the wrist or the ankle, this waterproof wristband is fitted with an eyelet fastening preventing it from being
taken off by the person under surveillance.
These wristbands are made of anti-allergy plastic which can be in continuous contact with the skin.
The battery has an expected lifetime of more than a year (although replacing the batteries annually is recommended).
The IP 67 protection allows residents to take showers.
The wristbands can also be cleaned by placing them in an alcohol bath for 5 minutes.
They must be removed in the following cases:
- If they are faulty or the battery is dead
- When the resident leaves
- When the resident undergoes an MRI (magnetic resonance imaging) scan
Etc
To remove the wristband, cut it with a pair of round-end scissors.
When a wristband is immobile it switches to low-consumption mode. This can increase the standalone capacity of
the battery to a maximum of 4 years when stored.
Once wristband movement is detected, it switches immediately to operational mode.
Technical characteristics
• IP 55 - IK 08
• Anti-allergy
• Frequency: 869.85 MHz
• Tx: 869.85 MHz - Rx: 446.525 MHz
• Radiated power: < 10 mW
Technical characteristics
• Power supply: 1 x CR2450 3 V battery
• Standalone operation: 18 months with normal usage
• Dimensions (mm): 33 x 40 x 17
• Weight: 28 g in working order
Activation or
deactivation
(5sminimum) by
passing a magnet
over the product
(5sminimum).
Should bedone
close to the
magnet of
controller
Cat. No. 0 766 22.
Wristband number:
last 3 characters.
To be entered for the 9010
and 9011 code settings.
9 804 23

6
CONTENTS
Device presentation and installation (continued)
Door contact Cat. Nos. 0 431 00/01
Power supply Cat. No. 4 131 05
The magnetic opening sensor must be connected to the “DOOR” input of controller 0 766 22.
Surveillance mode: an escape alarm is only generated on the double condition that a wristband and opening of
the door are both detected.
Intruder mode: an escape alarm is only triggered if the door is opened.
SECURE WANDERING SYSTEM - AUXILIARY ELEMENTS
Technical characteristics
• IP 41 - IK 02
• Operating temperature: -10°C to +70°C
• Cable type (to controllers 0 766 22):
1 x 0.9 mm pair
Technical characteristics
• Power: 15 W
• Operating voltage: 12 V
• Current: 1.25 A
• Dimensions: 5 x 17.5 mm modules
• Cable type (to controller 0 766 22):
2 x 1.5 mm2
• Class II
• Double operating terminal
• Protected by PTC against overloads and
short-circuits
Sensor
DOOR
0 766 22
3
4

7
CONTENTS
Standalone installation
EXAMPLE OF INSTALLATION
The diagram below represents a typical installation for a standalone system (i.e. not connected to the door unit
Cat. No. 0 766 06 of the nurse call unit).
The controller with built-in antenna (15W30 -->) Cat. No. 0 766 22 is normally installed in the immediate vicinity of
the exit door, at a height which allows easy access to the keypad (1.20 m). Antenna Cat. No. 0 766 21 is installed
at a height of around 50 cm opposite the controller.
If the exit under surveillance is very wide (between 1 and 15 metres) a maximum of two extra antennae placed
on either side of the passageway can be connected to the same controller. This avoids having to set the antenna
sensitivity too high, which risks wristbands in neighbouring rooms being detected.
As with any radio-controlled system, the antenna position is crucial for wristband detection performance and
careful consideration must be given to where it is installed. Equally, wherever possible wristbands must be placed
in an identical manner on all residents under surveillance (for example, on the right wrist if the antenna is to their
right when they go through the exit).
The maximum wiring distance between antenna and controller is 200 metres.
0 766 22
0 766 20
1 - 15 m
0 766 21
0 431 00
123
456
789
0
CE
≈ 0.5 m
2 x 1.5 mm2
2 x 0.9 mm2
2 x 2 x 0.9 mm2
≈ 1.20 m
4 131 05

8
CONTENTS
Standalone installation (continued)
Outdoor installation:
The secure wandering system is not intended for outdoor installation. However, surveillance of this type of exit is
possible where the installation is adapted:
- The controller must always be installed indoors.
- The antenna boxes must be placed in weatherproof enclosures made from non-conductive materials (plastic,
PVC, etc).
- The enclosure must be protected from direct sunlight in order to avoid the risk of excessive temperatures inside
the box.
Selecting a door release or lock:
• Door release: flush-mounted installation
- Cable type (to controller 0 766 22): 2 x 1.5 mm2
- Cat. No. 0 408 95: undervoltage door release 12 V=- 600 mA. For operation at emergency exits
- Cat. No. 0 408 98: shunt trip door release 12 V±/=- 500 mA
• Electromagnetic lock: surface-mounted installation
- Cable type (to controller 0 766 22): 2 x 1.5 mm2
- Cat. No. 0 767 07: 300 kg lock
- Cat. No. 0 767 08: 500 kg lock
EXAMPLE OF INSTALLATION (CONTINUED)

9
CONTENTS
WIRING - CONTROLLERS AND ANTENNAE
ST1
0 766 21
200 m max.
ST2
P3 P4
SW1
DS4
DS2
1
1
0 431 00 / 3511
0 766 22
ST6
ST4
ST7
1
CONF
1
1
DCIN
IN
EX
1
1
1
1
ST5
ST3
ST2
1234
SW4
ALARM
ST1
ALR
CLR
CHAPERONE
DOOR
4 131 05
UGA
1
MODE
LOCK
NL
1
56 78
2 3
3
4
4

10
CONTENTS
Chaperone
The controller must be set to chaperone mode in
order to allow a wristband wearer to go through an exit
without setting off the alarm.
This is done by entering a code on the keypad or by
activating the chaperone input (via a pushbutton or
keyswitch, etc).
The chaperone contact must be normally open or
normally non-powered (rest mode).
Acknowledgement
When an alarm is detected, the alarm output and the
buzzer remain active until they are acknowledged.
There are 2 different options for acknowledgement:
- entering the acknowledgement code on the keypad
- pressing a remote contact
The acknowledgement is processed each time this
input changes state.
The acknowledgement contact can therefore be of any
type (NO/NC or powered/non-powered).
Mode selection
The changeover from surveillance mode to intruder
mode and back can depend on the state of its wired
input. When the contact is open (or the input is not
supplied with power) the system is in surveillance
mode. When the contact is closed (or the input is
supplied with power) the system is in intruder mode.
The system status can therefore be controlled by an
external device (clock etc).
When this input is not being used, the changeover from
one mode to the other is achieved by entering a code
on the keypad (see parameter setting).
Standalone installation
OPERATING MODES

11
CONTENTS
System installation
The diagram below represents a typical installation for a BUS/SCS system (connected to door unit Cat. No. 0 766 06
of the nurse call unit).
EXAMPLE OF INSTALLATION
The system installation allows the escape to be signalled on the BUS/SCS nurse call unit via door unit
Cat. No. 0 766 06 and this way the information can be forwarded to DECT and tracking (see the BUS/SCS nurse
callunit guide).
The controller Cat. No. 0 766 22 with built-in antenna (15W30 -->) is normally installed in the immediate vicinity of
the exit door, at a height that allows easy access to the keypad (1.20 m). Antenna Cat. No. 0 766 21 is installed at
a height of around 50 cm opposite the controller.
If the exit under surveillance is very wide (between 1 and 15 metres) a maximum of two extra antennae placed
on either side of the passageway can be connected to the same controller. This avoids having to set the antenna
sensitivity too high, which risks wristbands in neighbouring rooms being detected.
As with any radio-controlled system, the antenna position is crucial for wristband detection performance and
careful consideration must be given to where it is installed. Equally, wherever possible wristbands must be placed
in an identical manner on all residents under surveillance (for example, on the right wrist if the antenna is to their
right when they go through the exit).
The maximum wiring distance between antenna and controller is 200 metres.
0 766 06
≈ 1.20 m
0 767 07
4 131 05
2 x 1.5 mm2
2 x 1.5 mm2




CE
0 766 22
1 - 15 m
0 766 21
≈ 0.5 m
0 766 20
2 x 2 x 0.9 mm2
2 x 2 x 0.9 mm2
0 431 00 / 3511
2 x 0.9 mm2

12
CONTENTS
System installation (continued)
Outdoor installation:
The secure wandering system is not intended for outdoor installation. However, surveillance of this type of exit is
possible where the installation is adapted:
- The controller must always be installed indoors.
- The antenna boxes must be placed in weatherproof enclosures made from non-conductive materials
(plastic, PVC, etc).
- The enclosure must be protected from direct sunlight in order to avoid the risk of excessive temperatures inside
the box.
Selecting a door release or lock:
• Door release: flush-mounted installation
- Cable type (to controller 0 766 22): 2 x 1.5 mm2
- Cat. No. 0 408 95: undervoltage door release 12 V=- 600 mA. For operation at emergency exits
- Cat. No. 0 408 98: shunt trip door release 12 V±/=- 500 mA
• Electromagnetic lock: surface-mounted installation
- Cable type (to controller 0 766 22): 2 x 1.5 mm2
- Cat. No. 0 767 07: 300 kg lock
- Cat. No. 0 767 08: 500 kg lock
EXAMPLE OF INSTALLATION (CONTINUED)

13
CONTENTS
WIRING - CONTROLLER/ANTENNAE AND DOOR UNIT
Door unit 0 766 06
M1 M2
80 to 9
15 16 17 18 19 2012 34
1
ST2
ST1
UGA
NL
1
56 78
234
ST1
0 766 21
200 m
max.
ST2
P3 P4
SW1
DS4
DS2
1
1
1
ST3 P5
0 766 06
0 766 71/CMSV1010
OR
4 131 05
ST6
ST4
ST7
1
CONF
1
1
DCIN
IN
EX
1
1
1
1
ST5
ST3
ST2
ALARM
ST1
ALR
CLR
CHAPERONE
DOOR
1
MODE
LOCK
0 431 00/
3511
0 766 22
1234
SW4
3
4

14
CONTENTS
System installation (continued)
Chaperone
The controller must be set to chaperone mode in order
to allow a wristband wearer to go through an exit without
setting off the alarm (chaperone period to be set).
This is done by entering a code on the keypad or by
activating the chaperone input (via a pushbutton or
keyswitch, etc).
The chaperone contact must be normally open or
normally non-powered.
For optimum security the controller returns to
surveillance mode after the door has been opened and
closed. The chaperone period is cancelled.
Acknowledgement
When an alarm is detected, the alarm output and the
buzzer remain active until they are acknowledged.
The alarm is acknowledged by pressing the green
nurse present button on door unit
Cat. No. 0 766 06.
Mode selection
The changeover from surveillance mode to intruder
mode and back can depend on the state of its wired
input. When the contact is open (or the input is not
supplied with power) the system is in surveillance
mode. When the contact is closed (or the input is
supplied with power) the system is in intruder mode.
The system status can therefore be controlled by an
external device (clock etc).
When this input is not being used, the changeover from
one mode to the other is achieved by entering a code
on the keypad.
OPERATING MODES

15
CONTENTS
For the initial commissioning or following a software update or restoration of the default settings (code 9090), the
controller is initialised with the standard operating settings which have the following values:
• Controller address: 1
• Chaperone period: 20 seconds
• Door contact operation: Normally Closed (value 0)
• Door contact time delay: 5 seconds
• Chaperone code: 217
• Acknowledgement code: 369
• Buzzer volume: 2
• Mode selection (surveillance/intruder) via wired input (value 0)
• Locking control: Lock (value 1)
• Direction detection: Deactivated
• Surveillance of radio elements: Activated (value 0)
• User language: English
• System link protocol: 2G anti-wandering system
• No code filtering (surveillance for all wristbands)
• Immediate restart for the alarms: 20 sec. time delay (value 0)
Default configurator position
Commissioning
FACTORY SETTINGS
ST6
ST4
ST7
1
CONF
1
1
DCIN
IN
EX
1
1
1
1
ST5
ST3
ST2
1234
SW4
ALARM
ST1
ALR
CLR
ACCOMP
PORTE
1
MODE
VERROU
0 766 22
1
ST1
1
ST2
1
ST3
1
ST5
ST6
11
S
ST4
1
ST7
1
CONF
1
0 766 21
ST2
P3 P4
SW1
1
1
DS4
DS2
ST2
1

16
CONTENTS
The parameters can easily be set for the system using simple codes which provide access to the different
parameter-setting steps.
A parameter setting is changed by entering the following on the controller keypad:
• 1 - The setting code (90XX codes)
• 2 - E (confirmation)
• 3 - The setting value
• 4 - E (confirmation)
• C: for cancelling an entry being made.
An entry in parameter-setting mode is confirmed by an audible signal from the controller lasting 2 seconds.
The system remains in parameter-setting mode for 2 minutes and then returns automatically to normal mode.
Entering a valid configuration code extends this period by 2 minutes.
The system remains fully operational in parameter-setting mode.
Code Setting
9001 Chaperone period: Period during which the controller will not detect an alarm after a chaperone code
is entered. This period can be set between 1 and 255 seconds.
Example: Chaperone period of 45 s: 9001 E 45 E
After the door has been opened and closed, the controller returns to surveillance mode and the
chaperone period is cancelled.
9002 Chaperone code: Code which must be entered when the system is in surveillance mode in order for
the exit to be crossed with a wristband without triggering an alarm. This code can be between 1 and
4digits long. Avoid using codes which start with “90” so as to avoid any of the parameter settings being
changed by mistake.
Example of code 1234: 9002 E 1234 E
9003 Acknowledgement code (standalone mode only): Code which must be entered in order to
acknowledge an alarm and stop the buzzer from sounding. This code can be between 1 and
4digitslong.
Example of code 456: 9003 E 456 E
9004 Buzzer volume: Sound level of the buzzer output in the event of an alarm. 0 = no audible signal,
1 = medium volume (75 dB(A) at 10 cm), 2 = high volume (85 dB(A) at 10 cm).
Example: Setting the buzzer to medium volume: 9004 E 1 E
Important: The system must be put in parameter-setting mode before codes are entered on the keypad by
entering the access code on the keypad (9039E) in parameter-setting mode. This code is only taken into
account if the configurator (CONF) is in position (factory position ).
1 1
4
7
C
1
5
8
0
2
6
9
E
3
3
C
0
0
4
7
1
5
8
2
E
6
9
E
E
6
9
E
PARAMETER SETTING
Commissioning (continued)

17
CONTENTS
Code Setting
9005 Mode change mechanism: Allows the user to choose whether the changeover from intruder mode to
surveillance mode is performed by entering codes on the keypad (value 1) or by analysing the mode
selection input (value 0).
Example: Mode selection by entering codes on the keypad: 9005 E 1 E
9006 Locking control: Operation with locking control (value 0) or with release control (value 1).
Example: Electric door release connected to the locking control: 9006 E 1 E
9009 Surveillance activation for the radio receivers: Enable (value 1) or disable (value 0) this function.
When this option is enabled and the link with a radio receiver is broken, the green indicator light flashes
and a beep is emitted every 10 sec.
Example: Disabling the radio surveillance function: 9009 E 0 E
9010* Adding a wristband number to the surveillance chart: Adds the number stated to the list of
wristbands to be kept under surveillance. The chart can contain 50 numbers (to find out the number
allocated, see the data sheet for wristband Cat. No. 0 766 20 in this guide).
Example: Adding the number 123 to the list of wristbands to be kept under surveillance: 9010 E 123 E
9011* Deleting a wristband number from the surveillance chart: Removes the number stated from the chart
of numbers under surveillance. If the number to be removed is 0, all the numbers are deleted.
If there are no numbers in the chart then the system is open, meaning detections from all the wristband
numbers are acknowledged (to find out the number allocated, see the data sheet for wristband Cat. No. 0
766 20 in this guide).
Example: Deleting the number 123: 9011 E 123 E
Example: Deleting the chart: 9011 E 0 E
9012 Door contact: Using a normally closed (value 0) or normally open (value 1) door contact.
Example: Connecting a normally open door contact: 9012 E 1 E
9013 Door contact time delay: When the door is closed again the system considers it to be open for a few
more seconds. It is therefore possible to position the detection antenna a few metres beyond the door
to be monitored. This way the alarm is still triggered if the wristband wearer passes through the exit but
is only detected a few seconds after the door has closed again. However, in chaperone mode closing
of the door is taken into account straight away. The length of time can be programmed between 1 and
25seconds. This period is equal to 5 seconds by default.
Example: 10-second time delay: 9013 E 10 E
9014 Immediate restart for authorised alarm: When this option is enabled (value 1) an escape alarm can be
restarted immediately following acknowledgement of the alarm. Otherwise the wristband has to leave the
detection zone for at least 20 seconds before a new escape alarm is again possible from this number.
Example: Immediate restart for authorised alarm: 9014 E 1 E
*: Not recommended as the controller limits the number of wristbands to 50.

18
CONTENTS
SETTING THE ANTENNAE
Due to the low power level radiated by the wristband transmitters, the sensitivity level of the antenna must be set
under conditions that are as close as possible to normal system usage.
Proceed as follows in order to set the antenna:
• Set thumbwheel SW1 to 8, which corresponds to medium sensitivity for the receiver
• Check that the antenna is in test mode: position of configurator ST2 1
• Put on a wristband in exactly the same way as the residents will wear them (for example, on the right wrist)
• Remove all other wristbands from the system in order to prevent any interference. Place them in standby mode
or put them in a metal box or enclosure.
• Adjust the sensitivity of the antenna using thumbwheel SW1 so that you will be detected once inside the desired
area. The detection and reception level in relation to the threshold defined by SW1 are indicated by the antenna
indicator lights flashing (see below). Allow a safety margin in order to ensure detection even if a wristband's
radio range is altered (if an unusual obstacle is present, etc). The value 0 corresponds to the receiver's minimum
sensitivity level, so the transmitter must be very close in order to be detected (just a few centimetres). The higher
the thumbwheel value, the greater the detection distance. The value F corresponds to the acknowledgement of
any signal received that is correctly decoded.
• Exit test mode by resetting configurator ST2 to position 1
• Perform one or more trigger tests in normal mode
Illuminated signals in test mode
• DS4 green indicator light
- On continuously: Awaiting reception
- Off for 200 ms: Receiving wristband
• DS2 red indicator
- Off: No reception or level below that determined by SW1
- 100 ms pulse: Reception with a level slightly higher than the threshold determined by SW1
- Two 100 ms pulses: Reception with a level much higher than the threshold determined by SW1
Green indicator light
Red indicator light Switch to test
mode
Detection threshold
Switch to
normal mode
Wristband
reception level
Recommended
detection zone
Commissioning (continued)
It is advisable to mark out the detection zone on the ground.