Leica FL400 User manual

From Eye to Insight
MEDICAL DIVISION
User Manual
10 744 764– Version 04
LeicaFL for M

II Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 1
Thank you for purchasing a Leica surgical microscope accessory.
In developing our systems, we have placed great emphasis on simple, self-
explanatory operation. Nevertheless, we suggest studying this user manual
in detail in order to utilize all the benefits of your new surgical microscope.
For valuable information about Leica Microsystems products and services, and
the address of your nearest Leica representative, please visit our website:
www.leica-microsystems.com
Thank you for choosing our products.We hope that you will enjoy the quality
and performance of your Leica Microsystems surgical microscope.
Leica Microsystems (Schweiz) AG Medical Division
Max-Schmidheiny-Strasse 201 CH-9435 Heerbrugg
Phone: [phone]
Legal disclaimer
All specifications are subject to change without notice.
The information provided by this manual is directly related to the operation
of the equipment. Medical decision remains the responsibility of the clinician.
Leica Microsystems has made every effort to provide a complete and clear
user manual highlighting the key areas of product use. Should additional
information regarding the use of the product be required, please contact your
local Leica representative.
You should never use a medical product of Leica Microsystems without the
full understanding of the use and the performance of the product.
Liability
For our liability, please see our standard sales terms and conditions. Nothing in this
disclaimer will limit any of our liabilities in any way that is not permitted under
applicable law, or exclude any of our liabilities that may not be excluded under
applicable law.

II Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 1
Contents
1 Introduction 2
1.1 About this user manual 2
1.2 Symbols in this user manual 2
1.3 Optional product features 2
2 Product identification 2
3 Safety notes 3
3.1 Intended Purpose 3
3.2 Indication for use 3
3.3 Intended User 3
3.4 Intended Target Population 3
3.5 Dangers of use 3
3.6 Signs and labels 3
4 Description 4
4.1 Function 4
4.2 Design 4
4.3 Controls 4
5 Preparation before surgery (M530 OHX, M530 OH6,
ARveo) 6
5.1 Using the "Fluorescence FL400" user preset 6
5.2 Modifying the FL400 user preset 7
5.3 Get current settings 8
5.4 Creating your own FL400 user 8
5.5 Example "Handle left" assignment 9
5.6 Example "FL" settings 10
5.7 Save user settings 10
6 Preparation before surgery (ARveo 8) 12
6.1 Creating a surgeon profile 12
6.2 Select an existing surgeon profile 13
6.3 How to use preset profiles 14
6.4 Configuring the user inputs on the handles and foot
switches 15
7 Modifying the FL400 settings (ARveo 8) 19
7.1 Excitation intensity 19
7.2 Fluorescence visibility 20
8 Operation 21
8.1 Operating Range Limits for FL400 21
8.2 Preoperative checklist 21
8.3 Using the Leica FL400 for M530 22
9 Care and maintenance 23
10 What to do, if… 24
10.1 General 24
10.2 Status messages 24
10.3 Electrical 26
10.4 Common troubleshooting steps 27
11 Technical data 28
11.1 Leica FL400 characteristics 28
11.2 Compatibility 28
11.3 Ambient conditions 28
12 Manufacturer's declaration of electromagnetic
compatibility (EMC) 29

Introduction
2 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 3
1 Introduction
1.1 About this user manual
The Leica FL400 for M530 is an accessory for Leica surgical
microscope systems.
In this user manual the functions of the Leica FL400 for M530 are
described. For information and description of the Leica surgical
microscope, please refer to the user manual of the particular
surgical microscope.
In addition to notes on the use of the instruments this
user manual gives important safety information (see
chapter "Safety notes")
X Read this user manual carefully before operating the
product.
1.2 Symbols in this user manual
The symbols used in this user manual have the following meaning:
Symbol Warning
word
Meaning
Warning
Indicates a potentially hazardous situation
or improper use that could result in serious
personal injuries or death.
Caution
Indicates a potentially hazardous situation
or improper use which, if not avoided, may
result in minor or moderate injury.
Note
Indicates a potentially hazardous situation
or improper use which, if not avoided, may
result in appreciable material, financial
and environmental damage.
Information about use that helps the user
to employ the product in a technically
correct and efficient way.
X Action required; this symbol indicates that
you need to perform a specific action or
series of actions.
1.3 Optional product features
Different product features and accessories are optionally available.
The availability varies from country to country and is subject to
local regulatory requirements. Please contact your local
representative for availability.
2 Product identification
The model and serial numbers of your product is located on the side
and top of the Leica FL400 for M530 filter module.
X Enter this data in your user manual and always refer to it when
you contact us or the service workshop regarding any questions
you may have.
Type Serial no.
... ...

Safety notes
2 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 3
3 Safety notes
A Leica surgical microscope with Leica FL400 for M530 is state-of-
the-art technology. Nevertheless, hazards can arise during
operation.
X Always follow the instructions in this user manual and in the
user manual of the Leica surgical microscopes, and in particular
the safety notes.
NOTE
Appearance of GUI screenshots
The graphical user interface (GUI) screenshots are for reference only
and can vary in function of the configured options and different
surgical microscopes. However, the functionality of the Leica FL400
is addressed.
3.1 Intended Purpose
The Leica FL400 for M530 serves as a fluorescence excitation light system
in conjunction with an approved tumor-selective substance
(Gliolan = 5-ALA = 5-aminolaevulinic acid) for tissue characterization in
open neurosurgery.
WARNING
Leica FL400 should only be used with fluorophores
approved for use within the specified spectral ranges.
WARNING
Leica FL400 is not a standalone diagnostic device.
3.2 Indication for use
The indication is dependent on the use of the fluorescence of the
fluorophores used together with the filter.
3.3 Intended User
Leica FL400 is intended for professional use only. The user must
have corresponding technical qualification and have been trained in
the use of the instrument.
3.4 Intended Target Population
The intended target population are patients undergoing a surgical
procedure as defined within the intended purpose and indications
for use.
Contraindication
The medical contraindications applicable to the use of Leica surgical
microscope accessories with Leica FL400 for M530 in combination
with a fluorescence medium are those to be taken into account
when using suitable brand substances.
3.5 Dangers of use
NOTE
Mechanical interference.
X Ensure, that the instrument did not suffer any mechanical
interference since it was last used. A pre-operational check
should be carried out prior to each new application.
3.6 Signs and labels
1
24
3
The type label is located on the side of the Leica FL400 for M530
filter module.
1Typ label
Federal Law restricts this device to
sale by or on the order of a licensed
medical practitioner. (USA Only)
CE label
2UDI Label



Production Identifier (PI)
Serial number
Date of manufacturing
GS1 Data Matrix Code
Device Identifier (DI)
3
REF
SN
a
b
Fabrication label
a Reference number
b Serial number
4
Mandatory label - read the user
manual carefully before operating the
product. Web address for electronic
version of the user manual.
Medical device
Leica FL400 for M530MODEL
Leica Microsystems (Schweiz) AG
CH-9435 Heerbrugg

Description
4 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 5
4 Description
4.1 Function
The illumination of the Leica M530 surgical microscope is a xenon
lamp located in the stand.
The Leica FL400 illumination filter module can provide visible and
fluorescence excitation light.
To switch between visible (white) light and fluorescence mode
illumination, a handle and/or foot paddle button has to be defined
in the user settings for each Leica FL400 user/ surgeon profile.
4.2 Design
The Leica FL400 for M530 is an accessory for the Leica M530 surgical
microscope.
4.2.1 Optics carrier with LeicaFL400 for M530
2
32
1
1
1 Leica M530 optics carrier
2 Leica ULT module
3 Leica FL400 for M530
• Optics carrier with integrated camera for visible light (optional).
• Interface for assistants, either to the left and right side or to the
back.
• Main surgeon and back assistant interface, 360° rotatable both
• Back assistant interface with fine focus knob.
• Fluorescence observation filter module (Leica FL400 for M530).
• Leica ULT system components built into the common housing of
the ULT.
4.2.2 Stand
The following are examples of Leica surgical microscopes.
2
3
45
3
2
1
1
1
6
2
3
1 Leica M530 optics carrier
2 Camera control unit (optional)
3 Documentation system control unit (optional)
4 Leica M530 OH6, ARveo, ARveo 8 surgical microscopes
5 Leica M530 OHX surgical microscope
4.3 Controls
4.3.1 Status LEDs
1
Leica OH6, ARveo & ARveo 8
PROVIDO
Leica OHX
1
The following LEDs on the swing arm are significant for the
Leica FL400 for M530 application:
1 Status LED for fluorescence
• LED lights up in blue = Leica FL400 mode
• LED lights up in white = White light mode (M530 OHX only.
On M530 OH6, ARveo and ARveo 8 the LED is simply off in
white light mode)

Description
4 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 5
4.3.2 Handles
1
2
4
3
5
4
1
2
Assignment in the factory setting
1 Magnification
2 4-function joystick
3 Working distance
4 Release all brakes
5 Release preselected brakes
You can assign switches 1, 2, 3 and 5 of the handles
individually for each user in the configuration menu.
In all presets, key (4) releases all brakes. This key cannot be
configured. For the joystick and the other keys presets are
available according to your task.
Handle presets for Fluorescence FL400
M530 OHX / M530 OH6 / ARveo
no function Y+
no function Y–
FL400 X–
no
function
X+
ARveo 8
no function lamp+
no function lamp–
FL400
record
video
no
function
take
picture
All microscopes
Selected brakesSelected brakes
Working
distance
Magni-
cation
Magni-
cation

Preparation before surgery (M530 OHX, M530 OH6, ARveo)
6 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 7
5 Preparation before surgery
(M530 OHX, M530 OH6,
ARveo)
5.1 Using the "Fluorescence FL400"
user preset
The current settings for the active user are displayed on the main
page:
1
X Tap on the "User List" button (1).
The available user list for the microscope is displayed:
2
X Tap the "Presets" button (2).
The available presets for the microscope are displayed:
3
X Select the "Fluorescence FL400" user preset button (3).
NOTE
The FL400 user presets are only available if the FL400 accessory is
enabled in the accessory list of your Leica Surgical Microscope. If
not, please get in contact with your local Leica Service.
After you have selected the “Fluorescence FL400” preset you will be
asked to confirm the change of the user preset.
4
X Select the "Confirm" button (4).
The main page for "Fluorescence FL400" with the actual
settings in
white light mode is displayed:

Preparation before surgery (M530 OHX, M530 OH6, ARveo)
6 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 7
Switch the Fluorescence FL400 mode “ON” by using the predefined
“ON/OFF“ button (1) on the left handle.
no function
no function
FL400
no
function
Left Handle
1
X Press the joystick to the left:
The main page for “Fluorescence FL400” with the actual
settings in
Fluorescence FL400 mode are displayed:
NOTE
In FL400 mode, limitation of working distance and magnification is
always active.
X To switch back to the white light mode press the joystick of the
left handle to the left side once again.
The main menu “Fluorescence FL400” with the actual settings
in white light mode are displayed.
5.2 Modifying the FL400 user preset
The factory FL400 user settings cannot be overwritten,
however if you adjusted the settings to your needs, you can
adopt and save them under a new user name. (see chapter
5.7 "Save user settings")
NOTE
Do not change the settings or edit the user list when the
microscope is in direct use on a patient. The FL400 mode is
automatically stopped when modifying the settings.

Preparation before surgery (M530 OHX, M530 OH6, ARveo)
8 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 9
5.3 Get current settings
On the page “Main > Fluorescence FL400” for both white light and
FL400 modes, a “Show Settings” button can be found.
1
X Tap the “Show Settings” button (1).
The “User Settings > Fluorescence FL400” page is displayed. On
this page you can find several tabs with information on the
current settings of the Leica surgical microscope system.
X Tap the “Handle Left” tab (2).
This shows an overview of the buttons on the "Handle Left"
including the button with which the FL400 functions (ON/OFF)
can be operated:
2
5.4 Creating your own FL400 user
You can create and save your own FL400 settings according to your
preferences.
X Before creating your own FL400 user follow the steps in chapter
(see chapter 5.1 "Using the "Fluorescence FL400" user preset").
X Tap the quick access "Menu" button (1) once you are on the
main page for FL400:
1
After pressing the button the following screen is displayed:
2
X Tap the "User Settings" button (2).
In each of the displayed tabs you can change the predefined
user settings.

Preparation before surgery (M530 OHX, M530 OH6, ARveo)
8 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 9
5.5 Example "Handle left" assignment
X Tap the "Handle left" tab (2).
This displays the user settings page for the left handle. On the
handle left assignment screen you can assign up to nine
functions of your choice:
21
Example: Assigning the button for activating and de-activating the
FL400 mode.
X In the left selection field (1) scroll to the function group
“Fluorescence” by using the arrowheads (3).
3
X Select the desired function you wish to assign. In this example it
would be: "FL400 Mode On/Off".
X Click on a free or assigned caption of the desired button on the
handle to assign the selected function to it.
NOTE
The “All Brakes” function is always assigned to the rear switch (1)
for both handles and can neither be overwritten nor deleted.
The inner switch (2) to which “Selected Brakes” is pre-assigned but
can be freely assigned to your wishes.
1
2
1

Preparation before surgery (M530 OHX, M530 OH6, ARveo)
10 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 11
5.6 Example "FL" settings
X Tap the "Menu" button in the header.
X Select "User Settings".
X Select the "FL" tab to set the brightness in FL400 mode to an
adequate level.
Recommended and default brightness level is 100%.
X Scroll to the brightness level you like to use by using the
arrowheads.
X Decide if the working distance (WD) limitation in White light
mode should be switched ON (default) or OFF1,2.
NOTE
1) Please note that a factory limitation is applied to the working
distance (see 8.1) as soon as the FL400 mode is activated. Hence, if
working distance (WD) limitation in White light mode
is switched
off
and the working distance is above this limit (see chapter
8.1 "Operating Range Limits for FL400") when switching to FL400
mode, the working distance will be reduced and the picture will get
out of focus.
2) This limitation can be activated within the FL400 mode settings
menu [see graphics above]. This setting will enable or disable the
WD limitation during white light mode. While using the WD
limitation, the microscope might need to be repositioned (meeting
the WD limitation value or getting closer than the WD limitation
value) to get into focus.
The WD and Mag limitation values can be redefined to higher or
smaller values generally for all users by Leica service personnel in
the service menu to fit the needs of the surgical workflow.
5.7 Save user settings
After adapting the user settings, you can save your changes under a
new username.
1
X In the "User settings" menu tap on "Save" (1) and then on
"Save as New" buttons.
A editable list of users is displayed:
X Select an available location in the user list at which you want to
store your settings.

Preparation before surgery (M530 OHX, M530 OH6, ARveo)
10 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 11
X Enter the desired username using the on-screen keyboard.
X Tap the “OK” button to save the user settings at the desired
location under the name you have entered.
NOTE
User setting protection
To avoid unauthorized or accidental changes of user settings, each
user setting can be protected by a password/PIN. This keeps the
working parameters identical each time you load a protected user
setting. Changes can be done during the application but will not be
stored unless saved by pressing "Save" and choosing either the
"Save as current" or "Save as new" option, using the correct
password/PIN or by creating a new user and password/PIN
combination respectively.
Please refer to the user settings chapter in the manual of your
respective surgical microscope for detailed instructions on how to
set or change passwords.

Preparation before surgery (ARveo 8)
12 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 13
6 Preparation before surgery
(ARveo 8)
For more information about preparation before surgery,
refer to the user manual of ARveo 8.
6.1 Creating a surgeon profile
6.1.1 Creating a new surgeon profile with factory
default settings
1
X Tap the "Data review" (1) icon on the GUI "Live Screen" page.
The following menu appears:
2
X Press "New Surgery" (2).
The "Select Surgeon" page appears.
3
X Tap the "Create New" button (3).
The "Create New Surgeon Profile" page is displayed:
4 5
X Fill in at least the mandatory data for a surgeon profile, i.e. first
name and a unique three-letter acronym.
Fields marked with an * are mandatory.
You can enter your last name and a "passcode" to secure
your settings. This is recommended to avoid unintended
changes by other surgeons or personnel. Please note that
the "passcode" has to be typed twice to confirm it and can
contain maximum ten (10) characters.
X Press either "Copy" (4) or "Create New" (5) .
The "Create New" function allows to start from default factory
settings.
The "Copy" function (see chapter 6.1.2 "Creating a new surgeon
profile from an existing surgeon profile or preset") allows to
copy settings from a preset or an existing surgeon profile which
can then be adapted to your needs.

Preparation before surgery (ARveo 8)
12 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 13
6.1.2 Creating a new surgeon profile from an
existing surgeon profile or preset
When the "Copy" function is used (see chapter 6.1.1 "Creating a new
surgeon profile with factory default settings"), the list of existing
surgeon profiles and presets is displayed.
The Leica FL400 user can chose a surgeon profile for which the
Leica FL400 profile has already been defined or choose the FL400
preset profiles _Tumor or _Tumor+IGS.
The factory preset profiles are displayed at the top and are
generally prefixed with an underscore (i.e. _Tumor).
X Select the desired preset or surgeon profile to copy.
X Press "OK". In both cases (copying a preset or copying an
existing surgeon profile), after pressing OK, the name of a new
surgeon profile is specified (see chapter 6.1.1 "Creating a new
surgeon profile with factory default settings") and appears on
the "Live Screen" on the top right with the copied settings.
X Configure the user input settings (see chapter 6.4.1 "Example of
how to assign the Leica FL400 function to a handle button").
6.2 Select an existing surgeon profile
X Open "Select surgeon" page (see chapter 6.1.1 "Creating a new
surgeon profile with factory default settings").
X Choose between different surgeon profiles from the "wheel".
1
23
If more than 5 profiles have been defined, the user can rotate
through all defined and activated profiles by dragging with their
finger. Profiles are alphabetically sorted by first name. The list is
"infinite", i.e. after the last item in the list, the first item will appear
as the next one. If there are less than 4 profiles, there is no need or
option to drag.
Tapping on one of the surgeon profiles opens the "Live Screen"page
and the name of a chosen surgeon profile appears on the top right.
When the user taps "Default" (3) or "Skip to Live Screen" (1), the
default surgeon profile is chosen. Any changes to the default
settings are applied immediately, but will not be stored. i.e., the
next surgery using this default profile will start with the original
factory settings again.
When the user taps "Show preset profiles" (2), a list of preset
profiles appears, depending on the installed licenses.

Preparation before surgery (ARveo 8)
14 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 15
6.3 How to use preset profiles
X Open "Select Surgeon" (see chapter 6.1.1 "Creating a new
surgeon profile with factory default settings").
X Tap "Show preset profiles".
The following page appears:
For more information about preset profiles, see the
ARveo 8 user manual.
X Select the desired default profile. For Leica FL400 users select
"_Tumor" or "_Tumor+IGS".
The following warning screen appears:
1
X Press "OK" (1).
The selected profile is shown on the "Live Screen" page.
X Configure the user input settings (see chapter 6.4.1 "Example of
how to assign the Leica FL400 function to a handle button").
The preset profile can be used and modified, but any
changes to the profile settings will not be saved. Therefore,
with each new start-up, the default profile settings will be
restored.
Since the modifications to the preset cannot be saved, it is
highly recommended to create a new surgeon profile for a
full workflow where a preset can be used as a starting
point.

Preparation before surgery (ARveo 8)
14 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 15
6.4 Configuring the user inputs on
the handles and foot switches
X Make sure you are on the "Live Screen" page for the selected or
newly created surgeon profile.
1
X Tap the menu icon in the upper left corner (1).
The "Options" page is displayed:
2
X Tap the "Surgeon Settings" icon (2).
The "Surgeon Settings" page is displayed:
3
X Tap "Handles" button (3) to show the "Left Handle" settings.
Depending on the surgeon profile that is set ("new surgeon
profile with factory default settings" or "new surgeon profile
from an existing surgeon profile or preset") the left and right
handle display will differ. If using "new surgeon profile with
factory default settings", the predefined factory settings of the
left handle are displayed:
3
X Press on "Right" for the right handle configuration screen.
Predefined factory settings of the right handle are displayed:

Preparation before surgery (ARveo 8)
16 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 17
Now the handle settings can be viewed or edited for the
selected surgeon profile.
6.4.1 Example of how to assign the Leica FL400
function to a handle button
FL400 mode activation is a prerequisite to enable Leica FL400
functionality on the microscope. The following steps show how the
Leica FL400 function can be assigned to a button i.e., on the left
handle.
The preset for FL400 can be used to quickly assign the FL400
functionality to a predefined handle button (see chapter
6.1.2 "Creating a new surgeon profile from an existing surgeon
profile or preset"), but this can be done also manually choosing any
of the available buttons.
X Open the settings page for the handle you wish to configure (in
this example the "Left Handle" settings page) as described in
chapter (see chapter 6.4 "Configuring the user inputs on the
handles and foot switches") after having switched to the
particular surgeon profile you wish to edit (see chapter
6.2 "Select an existing surgeon profile"):
1
X When you are on the handle configuration page, press the
button you want to assign for the activation of the Leica FL400.
In this example we select the left button of the joystick (1).

Preparation before surgery (ARveo 8)
16 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 17
The "Select function" popup window for the selected button
appears:
2
X Select the "Fluorescence" tab (2).
A list of available FL functions appears.
34
X Select the Leica FL400 function (3) and press "Confirm" (4) to
save the settings.
The Leica FL400 function is assigned to the selected button as
displayed:
Deleting a function assignment
X In case the selected function needs to be deleted, press the
function button on the handle configuration page.
The "Select function" popup window for the selected button
appears:
5
X Press the "Delete" button (5).
The selected function disappears from settings of the handle
configuration page.
X Press the "Back" button of the handle configuration page.
The "Save Surgeon Settings" dialog appears.
X Press desired option.
The "Surgeon Settings" appear.
X Press "Back" to return to the "Options" page.
This process can also be used for any of the buttons to which
you wish to assign any other function.

Preparation before surgery (ARveo 8)
18 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 Leica FL400 for M530 / Ref. 10 744 764 / Version 04 19
6.4.2 Configuring the foot switch
You can configure the foot switch similarly to the handles.
X Ensure you have loaded the surgeon profile you wish to edit
(see chapter 6.2 "Select an existing surgeon profile").
X Open the "Foot Switch" settings page in the "Options" ->
"Surgeon Settings" page.
X Tap the selection field of the desired key on the foot switch.
The following selection menu opens:
12
X Select the desired function (1) and apply with Confirm (2).
The selected function is displayed in the selection field.
The selections are identical to those for the handles with the
exception of the brakes.
Example of foot switch with Leica FL400 assignment