Omnya AM 41443 User manual

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AM 41443
AUTOMIXER
PREAMPLIFIER
User’s Manual
Rel. 1.01
24/09/2007

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SUMMARY
1 FOREWORD
1.1 Thanks
1.2 The automatic mixer preamplifier
1.3 The package contains
2. DESCRIPTION
2.1 Block diagram and description
2.2 Front panel of AM41443
2.3 Rear panel of AM41443
3. THE CIRCUIT
3.1 Front panel switch
3.2 Microphone channel
3.3 Tone controls
3.4 Master balanced output
3.5 Auxiliary balanced output
3.6 USB control port
3.7 RS232 control port
3.8 Daisy-Chain connectors and RS485 port
3.9 Internal selections
4 OPERATING MODES
4.1 Manual
4.2 Mixer Stand-alone
4.3 Mixer Daisy Chained
4.4 Programming and controlling
4.5 Master and Slave
5 PROGRAMMING
5.1 Reset
5.2 Indications from the VU-meter
5.3 LED for status channel indication
5.4 Default settings
5.5 Behaviour with the manual selections
6 INSTALLATION
6.1 Mechanical installation
6.2 Plugging into the mains
6.3 Ground loop
6.4 Microphone lines
7 USING THE AUTOMIXER
7.1 Church setup
7.2 Conference room setup
7.3 Videoconferencing setup
7.4 Broadcast uses
8. TECHNICAL CHARACTERISTICS AND PERFORMANCES
8.1 List of the controls available for remote control:
8.2 Technical Data
APPENDIX OPERATING FUNCTIONS
A.1 AMB-THR
A.2 Last-On
A.3 One-On
A.4 LOM
A.5 NOM
A.6 ORG
A.7 NOISE GATE
A8 LIMITER

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1. FOREWORD
1.1 THANKS
Congratulations! You have chosen an Omnya brand product. The automatic mixer and
preamplifier AM41443 is a high technology device engineered to solve numberless
problems with an incredibly easy use. We hope you will be completely satisfied with this
product’s features.
1.2 THE AUTOMATIC MIXER
When installing a P.A. system where loudspeakers and microphones are located in the same
room, two contrasting requirements need to be met: an adequate sound level has to be
achieved to ensure intelligibility, but feedback must not be triggered.
Problems come up especially when several microphones are used, as the installer has to adjust
each of them to the required sensitivity when in use. However, when all the microphones are on,
overall sensitivity increases significantly as well, by 3 dB each time the number of microphones
doubles. We thus have +3dB when going from one to two microphones, +6dB from two to four,
+9dB from four to eight. The sensitivity increase easily moves the system into the feedback-
triggering zone and the overall gain has to be reduced to move back into the safe zone. This
way however, each individual microphone no longer has its optimum sensitivity. In general, the
final setting is a possibly poor compromise, with the significant drawback that, especially in a
reverberating environment, any microphone that is open and not engaged picks up and feeds
reverberated sound into the system: even when feedback is not triggered, the returning sound
tail blurs the direct sound.
AM41443 belongs to a new generation of automatic mixers under the OMNYA brand.
It is a small mixer working both manually and automatically, with a total modularity that avoids
real limits to the number of channels. This also means that more AM41443s can be installed
locally or in different places and controlled through a PC connection or a remote control panel.
It can work as manual or automatic stand-alone or through a USB port controlled mode.
The AM41443 main characteristic is that the audio signal is analog. The high quality
microphone front end maintains a very low distortion and a maximum signal/noise ratio. With
its 20dB headroom it guarantees a perfect result in any condition. This automatic mixer is
produced in a ½ rack unit metallic box.
A powerful microcontroller manages the control functions, the internal functions, the network
supervision and the links with the panel or the controlling PC.
The AM41443 has 3 independent balanced outputs. The main output works through a volume
control on the front panel. The second output, also having a trimmer volume control, can serve
a separate group of amplification devices. The third output can create a chain of several
automatic mixers through a RJ45 shielded connection cable containing the audio and the
control line data.
An output group can be managed by a tri-band equalizer adjusting the curve. The input
channels can be divided into two groups for particular uses such as in broadcast applications
with ambience microphones.
This device works with 24V external batteries and can give power supply up to 5 AM41443
with no need of additional power sources.
The firmware updates available on Internet can be easily installed through the USB port.
1.3 THE PACKAGE CONTAINS
Inside the AM41443 box you will find:
1 AM41443
1 50 cm RJ45-RJ45 connection cable
1 24V 300mA power supply
1 short rack-mounting bracket (long bracket for single mount or support for double mount are
optional)

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2. DESCRIPTION
The automatic mixer preamplifier AM41443 provides all the fundamental functions typical of
such device and some more features:
•It opens the engaged microphone channels only, and keeps the others closed (see par.
4.8). In other words, when the signal is generated by the voice of the speaker talking into
the microphone, the channel opens and turns on the signal. In any other case, when the
signal is due to ambient noise or reverberation, the channel stays closed and the signal
is attenuated and not heard.
•It keeps the mixer's output level at its preset value when the number of open microphone
channels changes (see NOM App.A.5)
Besides, the following functions are also available:
•LAST-ON: last activated microphone remains open even if the speaker is silent until a
new microphone is activated
•LOM: The number of open microphones can be limited from 1 to 4 for the single device,
from 1 to N for linked devices.
•ONE-ON: Microphone channel 1 is activated when any other microphone receives a
signal
•PRIO: one microphone channel has the priority over the other microphones.
•ORG: a chosen channel forces the closing of other channels which were qualified for
this function
•OVR: A channel can be forced open
Other AM41443 features are indicated in sections 8.1-8.2
The logic controlling this device is undoubtedly its fundamental and most important
characteristic. The AM41443 is basically a mixer with a VCA on each microphone channel that
turns the microphone on and off. Normally off, the gate goes on as soon as someone begins
speaking at the relevant microphone. One of the most important problems for an Automixer is
the circuit used to turn the channel on or off. To attain this result the incoming voice signal must
be compared to a reference or threshold signal. The easiest way is the use of a fixed threshold
as in a simple gate (the threshold voltage may actually be adjusted manually but remains fixed
during operation). A fixed threshold does not work: if set low, every unwanted sound picked up
by the microphone will open the channel, if set too high the first syllable of the speech will be
lost.
What is needed is a threshold voltage that automatically follows the ambient noise. Such is the
circuit used by the Automixer where the sum of the signals picked up by all microphones
connected to it is processed to produce the reference threshold signal that represents the
ambient noise. This way what actually turns the channel on is the difference between the direct
sound and the background or ambient sound.
The managing of the functions dedicated to an automatic mixer can be various and different.
The AM41443 is an analog mixer based on a digital control and even if it has a predefined
control mechanism it is open for future implementation of alternative models for the microphone
controls.
The AM41443 features 4 variable gain microphone inputs; phantom power is given to all
microphones at the same time through a front panel switch.

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2.1 BLOCK DIAGRAM AND DESCRIPTION
As shown in the picture the AM41443 mixer can be
used in very different situations thanks to its
particular features. As already said in the
description, this automatic mixer is a digital
controlled analog device. This means that AM41443
can conceive a very high audio purity and has the
advantage to allow both a local and a remote control
on the main functions. Also other processes, as the
channels opening, can be automated following
needs.
The input section has 4 variable sensitivity inputs
and processes signals from –60 dB to line level.
These inputs can be divided into 2 blocks of 2
channels each to control separately (locally or
remotely) the mixing of a number of channels. In this
manner, for example, we can mix on the auxiliary
output all 4 channels while we send only two of them
to the general mixing. This function could be useful
in situations in which a service need ambience
signals for a radio broadcast while the preserved
signals (without the ambience) are sent to the local
reinforcement system.
A tone correction feature can be used before the
master or the auxiliary output. The daisy chain
connection of more AM41443 (up to 24 devices can
be linked) is obtained through a RJ45 connector.
This connection allows the link between the units of
the digital line for the control-information on the
chain and the analog signals producing the mixed
program. The audio signals are directional.

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2.2 AM41443 FRONT PANEL
1) AUX2 Auxiliary volume output 2) Master volume 3) Low-medium-high tone control
4) VU meter and configuration signal 5) Microphone input level 1-4 6) ON LED
7) USB connection for remote PC control 8) External control LED 9) Reset button
10) Mode and function selection switch
12 345789
10
6

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2.3 AM41443 REAR PANEL
20) DAISY CHAIN connector 21) RCA auxiliary output 22) Master output
23) RS232 port 24) DC power supply 25) MICRO-LINE inputs
26) Sensitivity/filter switch
20 21 22 23 24 2625

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3. THE CIRCUIT
AM41443 is a complete automixer-preamplifier that can drive one or more power amplifiers.
Main features:
•4 variable sensitivity microphone inputs with 48V phantom power and selectable
high pass filter (see 3.1-3.2)
•General tone control (see 3.3)
•Balanced master output on XLRm connector (see 3.4)
•Balanced auxiliary output on RCA connectors (see 3.5)
•USB control port (see 3.6).
•RS232 serial control port (see 3.7).
•Connector used to link other mixing units through a daisy chain connection (see
3.8).
3.1 FRONT PANEL SELECTION SWITCH
In the default configuration of the device all the switches are lowered. In this condition it
works as an automatic mixer. To be more detailed:
The first lowered switch shows that the device is operative in the automatic mode, while all
the other functions are deactivated. These functions can be activated putting switches no. 2-
3-4-5 in the ON position.
For example:
to activate LAST-ON push switch no. 3 upward.
to activate phantom power on all microphones put switch no. 5 in the ON position.
The first switch in the ON position shows that the device is in the manual mode, i.e. mixing
every signal without on-board intelligence (as a concert mixer). The other functions (Noise-
Gate, Future Use, Limiter, and Phantom) can be activated pushing the switches upward
N.B. The first switch position changes the meaning of 2nd and 3rd switch.
AUTOMIXER
1
2
3
4
5
PHANTOM
LIMITER
LAST-ON
PRIO-CH1
ON
OFF

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P.S. The AM41443 can be controlled through an external serial connection (see
software user’s manual for the control of AM41443). It is important to remember that
the settings activated from the front panel prevail on the ones given from an external
control.
3.2 MICROPHONE CHANNEL
It includes the balanced input low noise preamplifier with selectable sensitivity control and
high-pass filter.
The microphone input features a XLR-3F connector codified as follows:
PIN 1 = MAINS / PIN 2 = + (hot) / PIN 3 = - (cold)
Next to the XLR connector there is a 4-position DIP-Switch [26, par.2.4]. The three sections
on the right control the gain following the scheme in the picture.
1
2
3
4
5
MANUAL
MIXER ON
OFF
PHANTOM
LIMITER
(FUTURE USE)
NOISE-GATE

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The gains increase lowering the switches from right to left as shown here above and on the
device rear panel.
HIGH PASS FILTER
HIGH PASS FILTER ON 100HZ
FLAT
(flat up to 10 Hz)
The first section on the left is for the activation of the high pass filter. This filter is activated as
in the above scheme:
The installer must necessarily know the exact sensitivity of the installed microphones
in order to assign the correct gain to each input.
The green LED (par.2.3) placed on the front panel under every volume control lights up when
a channel is activated. When the light goes out the channel is being deactivated. In case of
short pauses the led stays on, due to the HOLD circuit.
When this LED lights up in RED colour it indicates the channel is saturated. If the LIMITER
function is activated, this LED indicates that the limiting function is active on the signal to
avoid the saturation.
1 2 3 4 1 2 3 4
1 2 3 4 1 2 3 4
0dB
40dB
20dB
60dB
1 2 3 4
1 2 3 4

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3.3 TONE CONTROLS
Normally deactivated (default). Internal setting (see sect. 3.9)
Some tone controls on the front panels are reachable by means of a screwdriver. These filters
have been put to limit actions on the low, medium and high spectrum components in order to
obtain a general adjustment of the output signal.
The minimum and maximum output signal excursion through these controls is shown in the
picture below:
Maximum emphasis and attenuations: ±10dB
•LOW-PASS: 20Hz
•MID_BAND: 1250Hz
•HIGHT-PASS: 20kHz
Tone controls can be active on the Master main output or on the auxiliary output separately, or
on both depending on the position of the selectors inside the device (see section 3.9)
3.4 MASTER BALANCED OUTPUT
This output is electronically balanced. It is necessary to remember that when the Vumeter
shows 0dB the balanced output level is 12dBu. When connecting an unbalanced input device
to an output only the output between pin 2 and pin 1 can be used, leaving pin 3 disconnected.
This unbalanced signal level has a 6dBu level. The XLR-3M output connector links [22,
par.2.4] are:
PIN 1 = mains / PIN 2 = + (hot) / PIN 3 = - (cold)

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3.5 AUXILIARY BALANCED OUTPUT
A second balanced output is available through the double RCA connector [21, par.2.4],
working with an auxiliary control level on the front panel [1, par.2.3]. This auxiliary output is
nevertheless controlled by the Master volume control [2, par.2.3] but the level control [1,
par.2.3] allows superimposing a ±16 dB.
On the upper RCA connector there is an in-phase signal, on the lower RCA connector the anti-
phase signal. These two signals form a balanced signal connectable with an XLR connector.
This additional output is useful to set a different route of the input signals; it gives also the
possibility to exploit the split-channels and tone control functions to reinforce different areas of
the sound system, or for different uses such as radio or television broadcasts with the use of
ambience technique.
3.6 USB CONTROL PORT
The connector placed on the right side of the front panel [7, par.2.3] is for USB connections
with a personal computer. The control software is provided with the AM41443. Updates are
available for download at the website:
www.omnyamix.com/download.htm
The parameters on the single AM41443 connected to form a system can be completely
controlled through the USB-B connection.
In a configuration made with more than one AM41443 linked together, the USB port works
exclusively on the Master unit.
3.7 RS232 CONTROL PORT
The automatic mixer AM41443 has a serial port RS232 for the connection with a standard
control system device [2.4-23]. The connection is made via a 3,5mm stereo jack connected as
follow: Tip: Tx
Ring: Rx
Body: Ground
In a configuration made with more than one AM41443 linked together, the RS232USB port
works exclusively on the Master unit.

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3.8 DAISY-CHAIN CONNECTORS AND RS485 COOMUNICATION PORT
The AM41443 can be connected in a chain to obtain complex configurations. For this reason
on the back panel there is a double connector of the RJ45 type [20, par.2.4]. These connectors
provide the following signals:
•Digital line (RS485) for the communication between different devices.
•Balanced analog line with the sum of all the channels and mixers connected upward.
•On the OUT connector a balanced line signal is available; on the IN connector there is
a real line balanced input that can be used for the input of a 0 dB signal in the system
(see table below).
•The power supply is sufficient for up to 3 additional AM41443 units. The connection is
directional; for this reason there is an Input and an Output connector. The pins
configuration is as indicated:
PIN INput Connector OUTput Connector
1 DATA+ DATA+
2 DATA- DATA-
3 D_GND D_GND Not connected (Internal
option for connecting)
4 24V_LINK 24V_LINK
5 GND_LINK GND_LINK
6 AUDIO/IN+ AUDIO/OUT+
7 AUDIO/IN- AUDIO/IOUT-
8 AUDIO_SHIELD (ground audio
shield) AUDIO_SHIELD (ground audio shield, preferably to be unconnected
with a custom cable in the case of long
lines)
IMPORTANT: The daisy-chain connection is directional in fact the double RJ45 [20, par.2.4] has one
section qualified as IN (lower connector) and one section qualified as OUT (upper connector).
For the appropriate audio signal connection a cable has to be connected from the OUT to the IN of the
next device.
It is possible to define as first device of the chain the one with no connection cables on the IN connector.
It is possible to define as last device of the chain the one with the free OUT connector.
There are no limitations on the position of the Master device in respect to the slaves. Nevertheless if we
want the Master unit to have the sum of all the channels it must be connected as the last device of the
chain.
NB. With the use of the RJ45 outputs the AM41443 provides the output of partial mixed signals along the
line. For example:
The 1st device has the mixed channels on the local outputs
The 2nd device has the sum of its channels plus those of the previous device, etc. on the local outputs
The last device (generally the Master unit) has the mixing of all the channels of the chain.
Taking into account that all the devices have a local auxiliary volume control, semi independent from the
Master, it is possible to have partial outputs for specific needs.
Creative use: it is possible to use the digital control on all the chain of devices creating different mixing
blocks. It is possible to break the audio chain using a formally wrong connection of the daisy chain cable.
In fact, connecting one OUT to one OUT or one IN to one IN the digital communication is maintained but
the audio signal stops at the desired level giving access to single devices or different mixing groups. The
Master level will act on all the groups.

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3.9 INTERNAL SELECTIONS
Inside the AM41443 there is a series of selections. The picture here below indicates the
position of the selectors associated with the functions:
•SPLIT Channel splitting
•GAIN Gain
•FILTER Filters bypass
Each function has two selectors (A, B) allowing different combinations.
The selection of the sections must be operated according to the tables here reported that
provide the indicated results.
SPLIT – This function permits the separation of the four inputs into 2 groups. One group
will be addressed to the Master output [22, par.2.4]; the other will go to the 2° auxiliary
output [21, par.2.4]. Based on the position of the SPLIT selectors, jointly with the FILTER
BYPASS selectors, these two groups provide various configuration; i.e. (1-2) // (3-4), or
(1-2-3-4) //(1-2) etc. Here below we exemplify various situations.

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MONO MODE configuration (default).
The device is release by the Manufacturer in this configuration.
Position of the selectors
Inputs 1-2-3-4 are addressed to the OUT2 A
Inputs 1-2-3-4 are addressed to the MASTER output B
This configuration is independent from the position of the filters selectors.
SPLIT MODE configuration
Position of the selectors
Inputs 1-2-3-4 are addressed to OUT2 A
Only the Inputs 1-2 are addressed to the MASTER output B
With the interaction of the SPLIT MODE and FILTER selectors is possible to obtain different
routing patterns as for example a stereo separation:
Inputs 1-2 to the MASTER output
Inputs 3-4 to the AUX output
These variations will be the subject of an application note separated from this manual.
GAIN - Gain for the Master Output. With the indicated selectors it is possible to modify
the level of the Master output [22, par.2.4]. There are 2 levels as indicated in the table.

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A
B
Gain: +12dB. Default selection
A
B
Gain: +6dB.
Note: the A and B selectors must be in the same position.
FILTER - These selectors enable the insertion of a three-band filter on the desired
outputs. It is possible to select among the following configurations:
A
B
DEFAULT
MASTER [22, par.2.4] and OUT2 [21,
par.2.4] outputs are in Flat.
This is the default configuration released by
the manufacturer.
A
B
MASTER and OUT2 outputs are served by
the tone control.
A
B
MASTER output is in Flat
OUT2 output is served by the tone control.
A
B
OUT2 output is in Flat
MASTER is served by the tone control.
With the interaction of FILTER and SPLIT selectors different configurations for the Input
signals are possible.

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These variants are the subject of an APPLICATIVE NOTE separated from this manual.
4 OPERATIVE MODALITIES
The AM41443 automatic mixer was born to be a fully autonomous and ready to use device
with the default parameters (factory default).
Changing the position of the 1° switch of the frontal dip-switch [10, par.2.3] it is immediately
possible to decide if the device will act as an automatic mixer or as a manual mixer. For the
other presets see chapter 3.
An AM41443 has 4 input channels; for the use of a greater number of channels more devices
can be connected in a chain. These devices can be programmed or controlled via an external
connection to a PC or to a remote panel. The connection can be made through a proprietary
link with the RS485 or USB ports or with a Crestron, AMX protocol with a RS232 port.
We schematically report the different functional modalities:
DEVICE CONFIGURATION
Programmable Via Computer
Via Computer
MANUAL
Controllable
Via Remote Panel
Programmable Via Computer
Via Computer
STAND ALONE
(SINGLE)
AUTOMATIC
Controllable
Via Remote Panel
DEVICE CONFIGURATION
Programmable
(if Master)
Via Computer
Via Computer
MANUAL
Controllable
(if Master)
Via Remote Panel
Programmable
(if Master)
Via Computer
Via Computer
IN CHAIN
AUTOMATIC
Controllable
(if Master) Via Remote Panel

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4.1 MANUAL
The AM41443 can be installed and used as a simple analog manual mixer. The selection
made on the first section of the dipswitch on the front panel [10, par.2.3] conditions the
functional modality. The manual modality (selector on the high position) allows the control of
the various channels and the master as in a normal mixer. All the microphones are open at the
same time because some of the logic functions are not active. For the other selections see cpt
.3.1. A manual mixer can be controlled remotely.
4.2 MIXER STAND ALONE
The AM41443 can be installed and used as an automatic mixer fully working on the base of the
factory default parameters. This modality is activated through the selection made on the first
section of the dipswitch on the front panel [10, par.2.3]; this selector is on the low position
(default).
The volume control is made with the potentiometers on the frontal panel, the logic takes care of
the automatic activation of the microphones relevant for the correct mixing of the signals. Some
variations of the default parameters are available on board (cfr. cpt.3.1).
4.3 DAISY-CHAINED MIXER
The functional modality as a mixer can be extended to other units that can be connected
through the daisy chain port [20, par.2.4]. A series of mixers (up to 24 units) can be connected
in order to create a large virtual mixer [see par.3.8]. In this logic we must consider that it is
necessary to assign the chain control to one of the units (Master). This device will lead the
chain while the others (slaves) will be logically connected to the first one.
For the activation and connection procedure of the devices please see chapter 5.
In this modality the mixers can be controlled through the frontal potentiometers for the various
input channels. The general volume (master volume) will be exclusively controlled by the
potentiometer of the Master unit. The output levels on the single units are disabled.
In this configuration it is possible to mix automatic and manual mixers to build a flexible
system.
The local controls activated with the front panel are working on the local device.
4.4 CONTROL AND PROGRAMMING
The AM41443 can be installed and operated under an external control. The external control
can be used to make an accurate setting of the system and control it in a remote modality.
These modality can be of three types:
•External control in a tuning session made through the USB port. It is useful to control
each parameter of the system using the software provided with the AM41443 (cfr
Software manual for AM41443). This operative mode is indicated for the accurate
control of all the variables contributing to the system functions.
The external control is operative both with a single mixer (Master) and with a system
constituted by more automatic units and manual mixers as well. The connection is
always made to the USB of the Master.
•External control through the RS232 for Crestron, AMX and similar controls. This
modality is typically indicated for the integration in applications with automation
systems.

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•Continuous external proprietary control, realized through a controller connected to the
RS485 port with the daisy chain connector. This modality can be used in case of an
external control of the system with a large data stream to be controlled. The external
control is possible connecting to the Master.
4.5 MASTER AND SLAVES
In a system consisting of more than one mixing unit we must consider the concept of Master
and Slave. One of the devices must take the control to coordinate the operations. This device
is commonly defined Master: it receives commands from the external world and processes the
information to be sent to the other devices of the system. The Slave, on the contrary, is the
device that, connected in the chain, contributes with its information to the decisions carried out
by the Master and applies the commands of its competence.
This hierarchy requires each device to be assigned an ID number. To simplify the procedure of
creating the chain, the AM41443 has a function providing the easy assignment of the Ids to the
various devices.
Normally, in a data network, each device must be precisely identified. In the case of a chain
made with a series of AM41443 the ID is automatically assigned with an increased speed and
easiness creating the network.
The operation that must be performed is preparing the devices for the auto-configuration. For
this operation we invite you to read the next section of this manual.
One more note on the behaviour of the device while in Slave mode when switched ON in the
absence of a Master. In this case the Slave device, after hearing the chain for about 10
seconds, is not finding a Master, it temporarely change to Master stand alone; this status is for
permitting the local functionality to a single system.

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5 PROGRAMMING
An important operation to be made when connecting more AM41443 units in the chain is to
define the role of the single units. In a system there can be only one Master, able to
coordinate up to 23 additional Slave units.
Preparing the Master and Slave units we must focus our attention on a small switch placed in
a hidden position on the right side of the front panel [9, par.2.3]; it can be reached through
the small hole in the panel. It is called reset switch.
5.1 RESET
The reset switch activates some features according to the way it is pressed. There are
basically 3 modes:
Activation time Behavior
< 1,5s The device quits the external mode. It gives the control back
to the local volumes (potentiometers on the front panel) [5,
par.2.3]).
> 1,5s e < 10s Master in the chain:
zLoads default values on the single device
zErases the table of the slaves
zEnters the transition mode (no master no slave)
zIf in the chain a Master already exists, the device
under reset, after a few seconds, becomes a Slave and
receives the ID sequential number from the Master.
Master alone:
zLoads default values
zErases the table of the slaves
zEnters the transition mode (no master no slave). After
some seconds, not being in a chain elects him to Master
status.
Slave in the chain:
zLoses the ID
zIf in external mode it maintains the status.
Slave alone:
zLoads default
zEnters the transition mode (no master no slave)
zLoses the external status (if present)
After about 10 seconds not being connected to a chain it
elects itself as a Master.
Pressing the reset switch
longer then 10s,.
>10s
It resets the device and activates the bootloader status. This
procedure allows to clean the device of all the changes,
loading the factory configurations. Moreover it is ready to
accept a new firmware through the USB port (firmware
update).
(Once the red LED is stable, maintain pressed the switch for
2 more seconds)
IMPORTANT: The reset switch is operative only in association with a further condition
illustrated in the yellow document associated to the manual. This procedure is used as a
minimal protection against accidental operations.