Tipro BeFREE20 Installation guide

BeFREE 20
15.0” Touchcomputer (J1900) with InterCom
TECHNICAL OVERVIEW
Description and Application
BeFREE20_TO_1_1.doc
Version 1.1
January 4, 2017

TABLE OF CONTENTS II
BeFREE 20 – TECHNICAL OVERVIEW
TABLE OF CONTENTS
A. GENERAL INFORMATION.......................................................................................A-1
A.1. Highlights..............................................................................................................A-1
A.2. Technical Characteristics ......................................................................................A-2
B. INTEGRAL PARTS AND FUNCTIONALITY .......................................................... B-1
B.1. Operator Interface.................................................................................................. B-1
B.2. Touchmonitor ........................................................................................................ B-3
B.3. Embedded Computer............................................................................................. B-3
B.4. Intercom (Audio Section)...................................................................................... B-4
B.4.1. Microphone Amplifier ................................................................................... B-5
B.4.2. Left and Right Speaker Amplifiers................................................................ B-5
B.4.3. Central Speaker Amplifier............................................................................. B-5
B.4.4. Bar-Graph Displays ....................................................................................... B-6
B.4.5. Incremental Encoders .................................................................................... B-6
B.5. External Connectors .............................................................................................. B-7
B.5.1. External Digital Inputs................................................................................... B-7
C. OPERATION ................................................................................................................ C-1
C.1. Configuring BeFREE 20 ....................................................................................... C-1
C.2. Applying BeFREE 20............................................................................................ C-1
D. OPTIONS......................................................................................................................D-1
D.1. Inclination Mechanism..........................................................................................D-1
D.2. HID Telephony Interface ......................................................................................D-1
D.3. Echo-Cancellation Circuitry..................................................................................D-2
D.4. Goose-Neck Microphone ......................................................................................D-2
E. ORDERING CODES .................................................................................................... E-1
E.1. BeFREE 20 ............................................................................................................ E-1
E.2. Inclination Mechanism .......................................................................................... E-2
F. REFERENCES ...............................................................................................................F-1
G. NOTICES......................................................................................................................G-1
G.1. Disclaimer .............................................................................................................G-1
G.2. Copyright Notice ...................................................................................................G-1

A. GENERAL INFORMATION A-1
BeFREE 20 – TECHNICAL OVERVIEW
A. GENERAL INFORMATION
The BeFREE 20 (BF 20) is a member of the modular FREE (also referred to as
FREE/FREE+/BeFREE) product family, integrating a 15.0” touchmonitor, a computer and
an intercom device. It is compatible and combinable with all existing FREE modules. The
touchmonitor comprises a high-brightness TFT LCD and 5-wire resistive touchscreen. The
computer is based on a main-board with Intel quad-core Celeron processor (J1900) and a
solid state disk. Thanks to low-power components and the corresponding electronic and
thermal design the BeFREE 20 is completely silent and without moving parts.
The Intercom section consists of a goose-neck microphone, illuminated PTT key, stereo
loudspeakers, two volume control knobs and two VU-meters. Its primary audio interface is
USB via two independent Audio Codecs, but it is also connected to the analogue sound
card of the embedded computer. This dual interface results in up to six listening (output)
channels and three parallel recording (input) channels. Status of the PTT key is reported
via HID Keyboard and/or HID Telephony interface.
A.1. Highlights
FEATURES
♦space-saving integration of a fanless touchcomputer and an intercom (functionally
equivalent to the combination of BeFREE 15 and two Speakerbox modules)
♦modular – combinable with other FREE modules into multifunctional terminals
♦low-profile horizontal design
♦silent and reliable - no moving parts, industrial grade components, Ethernet
redundancy, redundant internal audio and controller interfaces
♦extensive connectivity (LAN, USB, COM, external display, digital inputs)
♦cable management – hidden and secured, but accessible
♦built-in Tipro controller enables:
modularity and programmability
energy saving modes
touchscreen disable/enable control
brightness adjustment
six programmable keys
two programmable digital inputs (e.g. for an external PTT switch/pedal)
♦stereo loudspeakers (2 x 2W) with two separate volume control encoders
♦additional low-frequency loudspeaker (1 x 1W) with programmable equalizer

A. GENERAL INFORMATION A-2
BeFREE 20 – TECHNICAL OVERVIEW
♦total 5 W output power generates sound pressure level (SPL) of approximately 93 dB
at 1.0 m distance, what is approximately 25 times louder than average conversation
♦goose-neck microphone with illuminated PTT key
♦dual three-colour bar-graph display
♦five mechanical keys for brightness control, volume adjustment and other functions
♦several LED indicators (power, SSD, microphone, touchscreen ...)
♦optional Inclination Mechanism (VESA 75)
APPLICATIONS
♦operator/dispatcher terminals/consoles for command and control centres in:
transport and traffic control (railways, air traffic …)
public safety (police, fire brigades, ambulance …)
utilities (electricity, gas ...)
building/facility management systems (airports, banks, industrial plants …)
♦trading and banking consoles
♦multifunctional control panels
A.2. Technical Characteristics
ELECTRICAL
♦power supply: 12V ±5% (from an external AC/DC adapter)
♦power consumption:
Operating Mode Typical Maximal
OFF (power saving) 0.2W TBD
SLEEP (Windows standby) 3.0W TBD
IDLE 18.0W TBD
ACTIVE 23.0W 34.0W
Note 1: Values in the table above are temporary approximations of typical consumption, obtained
by measurements at the 12 V power input of the BeFREE 20 (LCD at full brightness) without any
additional Tipro modules and without any other peripherals connected. Terminology for Operating
Modes is taken from “ENERGY STAR Program Requirements for Computers: Version 5.0”.
♦internal interface and power connectors (to provide for modularity):
left-hand side Tipro Bus connector: 6-pin Micro-MaTch header (male) at the
end of a 6-wire ribbon cable
right-hand side Tipro Bus connector: 6-pin Micro-MaTch header (male) at the
end of a 6-wire ribbon cable

A. GENERAL INFORMATION A-3
BeFREE 20 – TECHNICAL OVERVIEW
right-hand side Tipro Power Bus connector: 10-pin Micro-MaTch header
(male) at the end of a 10-wire ribbon cable
♦external interface and power connectors (to provide for external expansions):
standard computer interfaces: LAN, USB, COM, VGA … (see Chapter B.5 for
details)
MECHANICAL
♦casing: plastic ABS, black (C15) colour with matte black (C25) top part
♦gross dimensions (with side-covers): 440 x 342 x 111 (W x D x H ) [mm]
♦goose-neck microphone length/height: 350±50mm
♦weight: 6.3 kg (approximately)
♦protection (sealing) grade: IP 20 (according to EN 60529)
Figure A.1 Physical Dimensions
ENVIRONMENTAL
♦operating ambient temperature range: +5°C to +35°C
♦storage ambient temperature range: -10°C to 50
o
C
♦relative humidity range: 20% to 80% (non-condensing)
EMBEDDED COMPUTER
♦Processor (SoC)
Intel Celeron J1900 2.0 GHz (2.42 GHz burst frequency)
♦Chipset
Northbridge functionality integrated in the SoC
Southbridge functionality integrated in the SoC

A. GENERAL INFORMATION A-4
BeFREE 20 – TECHNICAL OVERVIEW
♦System Memory
4GB DDR3L - 1333
♦Video
graphic processor integrated in the SoC
dual independent display support
resolution: up to 2560x1600
♦Dual Ethernet:
2 x Intel I211, 10/100/1000 Base-TX
♦Audio
Analogue Line In and Line Out (internally connected to Intercom)
♦Mass Storage
type: Solid State Disk
technology: Multi-Level Cell (MLC) NAND
interface: SATA II - 3 Gb/s
form factor: 2.5”
capacity: ≥120 GB
DISPLAY
♦type: TFT LCD
♦size: 15.0” diagonal
♦aspect ratio: 4:3
♦native resolution: 1024 × 768 (XGA)
♦luminance/ brightness (typical): ≥400 cd/m
2
♦contrast ratio (typical): ≥500:1
♦backlight lifetime (typical): ≥50,000 hours
TOUCHSCREEN
♦technology: 5-wire resistive (ELO)
♦positional accuracy: 2.03 mm (standard deviation of error)
♦positional accuracy: ± 4.572 mm (maximum error)
♦touch activation force: < 113g (typically)
♦controller resolution: 4096 x 4096 touch points
♦light transmission: 80 ± 5 % (at 550 nm wavelength)
♦lifetime: 35 x 10
6
touches in one location

A. GENERAL INFORMATION A-5
BeFREE 20 – TECHNICAL OVERVIEW
AUDIO SECTION (INTERCOM)
♦Loudspeakers (Left and Right)
two in parallel within the left output
two in parallel within the right output
type: dynamic
rated power: 3 W
output sound pressure level (SPL): 84 dB ± 3 dB @ 1 W @ 1 kHz @ 0.5 m distance
♦Loudspeaker (Central)
type: dynamic
rated power: 10 W
output sound pressure level (SPL): 87 dB ± 3 dB @ 1 W @ 1 kHz @ 0.5 m distance
♦Goose-neck Microphone
type: electret condenser, unidirectional
max input: 120 dB SPL
♦Analogue Amplifiers
designed to meet wide-band IP telephony standards
frequency pass-band: (100 Hz - 8 kHz) TYP
output power: 5 x 1 W (2 x 2 x 1 W + 1 x 1 W)
♦USB Audio Codecs
model: Texas Instruments PCM 2900C(Codec A) & PCM 2902C(Codec B)
USB Interface: full-speed, USB 2.0 compliant, certified by USB-IF
resolution: 16-bit Delta-Sigma ADC and DAC
sampling rates (ADC): 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz
sampling rates (DAC): 32, 44.1, 48 kHz
recommended data format: 16-bit (rather than 8-bit), stereo (rather than mono)
MECHANICAL KEYS
♦Push To Talk Key (two key-switches in parallel)
model: Cherry MX
key travel: 3.6mm to 4.0mm total, (2 ±0.6) mm pretravel
actuating force: (60 ±20) cN
reliability (Mean Cycles To Failure): MCTF = 1 billion (10
9
) press/release cycles
(50 million is guaranteed minimum)
♦Control Keys
model: Diptronic DTS
key travel (typical): 0.3mm
actuating force (typical): 255 cN
lifetime (minimal): 0.5 million operations

B. INTEGRAL PARTS AND FUNCTIONALITY B-1
BeFREE 20 – TECHNICAL OVERVIEW
B. INTEGRAL PARTS AND FUNCTIONALITY
BeFREE 20 represents an integration of a touchmonitor (display with touchscreen), a
computer, an intercom and a controller.
Figure B.1 Operator Interface of BeFREE20
B.1. Operator Interface
The Stripe (see Figure B.2 below) is an ergonomically designed vertical area along the
right-hand side of the display. It comprises a number of visual indicators and mechanical
keys with a proper tactile feedback in order to provide the operator with a quick insight and
immediate access to important controls. The most prominent position is assigned to the
PTT key, which consists of a full-travel mechanical key-switch and a large actuator with
dimmable background illumination. Several additional LED indicators (see Figure B.3) are
located in a Stripe extension on the left-hand side of the display.
Left
Speaker
Left Encoder
Microphone
Right Encoder
Display
PTT Key
Control Keys
Bar
-
Graph Displays
To chscreen
LED Indicators
R
ight
Speake
r
ON/OFF Key
Central
Speaker
Micro
phone LED

B. INTEGRAL PARTS AND FUNCTIONALITY B-2
BeFREE 20 – TECHNICAL OVERVIEW
Microphone LED Illuminated (red) while the microphone is
active (enabled).
Bar-Graph Displays Green: loudspeakers volume level
Red: VU-meter (actual signal level at the
loudspeakers and the microphone)
Orange: display brightness level
Volume UP Key Press to increase volume of left and right
speakers.
Volume DOWN Key Press to decrease volume of left and right
speakers.
Home / TouchDisable
Key
Long press disables touchscreen. Short
press (re)enables touchscreen.
Brightness UP Key Press to increase brightness of the display
and all visual indicators.
Brightness DOWN
Key
Press to decrease brightness of the display
and all visual indicators.
PTT (Push To Talk)
Key
By default PTT, but can be set to PTM
(Push To Mute) or any other key event.
Blue backlight can be programmed to
blink or turn ON/OFF upon press/release.
Figure B.2 The Stripe (Keys & Indicators)

B. INTEGRAL PARTS AND FUNCTIONALITY B-3
BeFREE 20 – TECHNICAL OVERVIEW
Power Blue Short blink: OFF (power saving mode)
Long blink: SLEEP (standby)
Continuous: ACTIVE (operating)
Disk Blue Blinking indicates read/write activity of
SSD
Touchscreen
Red Illuminated when touchscreen is disabled
Warning Red Illuminated when an error has been
detected
Figure B.3 LED Indicators
B.2. Touchmonitor
The touchmonitor comprises a high-brightness TFT LCD and a touchscreen. The
display is connected to the embedded computer via LVDS interface. The touchscreen is
operated by the respective controller with USB interface to the embedded computer.
Brightness of the LCD and all visual indicators on the Stripe (Bar-Graph Displays, LED
Indicators and PTT Key backlight) is adjustable by Brightness UP and DOWN keys.
Home / TouchDisable key can be used to temporarily disable touchscreen for cleaning
purposes.
B.3. Embedded Computer
BeFREE 20 incorporates an industrial grade single-board computer, which operates the
embedded touchmonitor and provides for an extensive connectivity to enable various
external peripherals to be used along (see Chapter B.5 for more details). It is internally
connected to the Tipro Controller (via USB and COM 4) as well as with the Audio
Section / Subsystem (via USB and Analogue Line-In / Line-Out signals).
The computer is based on Intel’s integrated circuits, what enables a wide-range of
operating systems to be applied. A solid state disk is used as a mass storage device. The
heat generated by integrated circuits is transferred via a heat-pipe to an internal heat-sink,
without a fan. As a result the BeFREE 20 is completely silent in operation, without moving
parts.

B. INTEGRAL PARTS AND FUNCTIONALITY B-4
BeFREE 20 – TECHNICAL OVERVIEW
B.4. Intercom (Audio Section)
The functional block diagram of the audio section is shown in Figure B.4 below. Left
and Right Speaker are physically/electrically realized as two loudspeakers in parallel to
double the output volume. The Central Speaker, along with associated hardware equalizer,
emphasizes lower frequencies in order to improve naturalness and intelligibility of the
reproduced speech.
Internal signal processing includes analogue-to-digital and digital-to-analogue
conversion (block “USB AUDIO CODEC” which comprises two USB Codec chips),
conditioning (amplification, attenuation, filtering …), sensing and switching. The complete
processing is programmable via ChangeMe software and can be dynamically modified
during the operation in so-called On-Line operating mode (using HID API). USB and
analogue signals can be mixed, resulting in up to six listening (output) audio channels (3x
stereo signal) and three parallel recording (input) channels (USB and analogue). The Echo-
Cancellation circuitry is optional (see Chapter D.3 for more details).
Figure B.4 Audio Section (Intercom)
L
R
ANALOGUE
AUDIO
L
R
AMPLIFIER
USB
AUDIO
CODEC
USB AUDIO
L&R
LINE OUT:
LINE IN:
LINE IN:
R
L
L&R
LINE OUT:
R
L
L&R
LINE OUT:
A
B
LINE IN:
∑
∑
M
AMPLIFIER
∑
MICROPHONE
AMPLIFIER

B. INTEGRAL PARTS AND FUNCTIONALITY B-5
BeFREE 20 – TECHNICAL OVERVIEW
B.4.1. Microphone Amplifier
This is a logarithmic audio amplifier with programmable gain, noise gating threshold
and compression ratio. Noise gating feature enables ambient noise to be suppressed. All
sounds below the threshold are removed inside the amplifier, so with higher threshold the
microphone needs to be used closer to the mouth and speech needs to be louder to get
through the amplifier. The compression feature enables compression of the output signal
dynamics in order to minimize the difference between soft/low and loud speech. The
amplifier is also capable of limiting extremely loud speech thus preventing distortion and
popping. The overall gain can be even lower than one (i.e. attenuation) as well as equal to
zero (i.e. totally muted input). Also the range of the goose-neck microphone can be
adjusted.
A linear regime of the amplifier is a special option which might be activated in full-
duplex operation where acoustic echo is to be cancelled using application software (rather
than optionally integrated hardware echo-canceller – see Chapter D.3).
B.4.2. Left and Right Speaker Amplifiers
These are linear audio power amplifiers with programmable gain, each driving its own
speaker (Left and Right Speaker in Figure B.4). The gain of each amplifier (i.e. volume
level of the respective speaker) can be adjusted by the user in normal operation via the
respective incremental encoder at the respective side of the module (Left and Right
Encoder in Figure B.1). The selected level is immediately displayed at the respective bar-
graph display in green colour (20 volume levels + mute). Each amplifier can deliver up to
2 W (2 x 1 W) of electric power to its speaker.
By default, the left speaker is driven by the sum of left output of USB Codec A and the
left output of USB Codec B, while the right speaker is driven by the sum of right output of
Codec A and right output of Codec B (so-called Stereo Mode). Alternatively, each Codec
can drive its own speaker, i.e. Codec A to left speaker, Codec B to right speaker (so-called
Mono Mode). In either of the modes the analogue Line Out signals can be optionally
added to the summing amplifiers, Line Out Left to left amplifier, Line Our Right to right
amplifier.
B.4.3. Central Speaker Amplifier
This is a linear audio power amplifier with programmable gain and cut-off frequency,
so it effectively acts as a programmable low-pass filter (which is a kind of an equalizer)
capable to boost lower frequencies (typically below 300 Hz) and improve naturalness of
the reproduced speech. It drives the Central Speaker by the “equalized” sum of signals to

B. INTEGRAL PARTS AND FUNCTIONALITY B-6
BeFREE 20 – TECHNICAL OVERVIEW
the Left and to the Right Speaker. The amplifier can deliver up to 1 W of electric power to
the Central Speaker.
B.4.4. Bar-Graph Displays
Each of the two bar-graph displays comprises 10 three-colour (red, green and orange)
LEDs. By default they constantly operate as VU meters in red colour, showing actual
levels of the respective speaker signals and the level of the microphone signal. Optionally,
the microphone signal can be disconnected from the VU meters.
If a rotation of an incremental encoder has been detected the respective bar-graph
automatically displays the gain of the respective amplifier in green colour. Volume UP and
DOWN keys can also be used to adjust the current volume settings, but simultaneously for
both speakers.
If a press of Brightness UP or DOWN key has been detected both bar-graphs
simultaneously display the current brightness setting of the LCD and all visual Indicators
in orange colour.
B.4.5. Incremental Encoders
These (Left and Right Encoder in Figure B.1) are endless digital potentiometers used
for immediate volume control of the Left and the Right Speaker respectively. Each has 24
detents per revolution. Every single detent changes the volume for one step up or down,
but only every second one is represented by one LED in the corresponding Bar-Graph
display in green colour.

B. INTEGRAL PARTS AND FUNCTIONALITY B-7
BeFREE 20 – TECHNICAL OVERVIEW
B.5. External Connectors
Numerous connections for external devices are available at the Connector Plate (see
Figure B.5) from underneath the module. Most of them are standard interfaces (USB,
LAN, COM, VGA …) intended for users to apply freely.
# Designator Type Note
1 12V Input Mini Power DIN reserved
2 Digital Input RJ 4P/4C socket see Chapter B.5.1
3 Dual USB 2 × USB type – A full-speed, 500 mA
4 Dual USB 2 × USB type – A full-speed, 500 mA
5 Dual USB 2 × USB type – A high-speed, 500 mA
6 LAN 1 RJ 8P/8C (RJ 45) 1 Gb Ethernet
7 LAN 2 RJ 8P/8C (RJ 45) 1 Gb Ethernet
8 COM 1 DSUB-9 male RS232 serial port
9 VGA DSUB-15 female analogue RGB output
Figure B.5 Connector Plate
B.5.1. External Digital Inputs
Two inputs (refer to Figure B.6 for the connector and signal description) are provided
for detection of external digital (ON/OFF) signals to be transformed into programmable
key events, equivalent to, for instance, PushToTalk key on the Stripe. Typical device to be
connected to is an external PushToTalk switch/pedal.
One of the inputs (A) is galvanically isolated (via opto-coupler) and is therefore
intended for an external ground-referenced signal, such as a digital output of another
electronic device. The other input (B) is to be used for an external “floating” signal, such
as contacts of a mechanical/magnetic key/switch (see Figure B.7).
1
1
3
3
4
4
5
5
6
6
7
7
8
8
9
9
2
2

B. INTEGRAL PARTS AND FUNCTIONALITY B-8
BeFREE 20 – TECHNICAL OVERVIEW
Pin # Signal
1 A– (GND)
2 A+ (RxD)
3 B+ (TxD)
4 B– (GND)
Figure B.6 Digital Inputs Connector
Port
Internal circuitry Suggested external circuitry
A
B
Figure B.7 Applying Digital Inputs
These inputs have an alternative function (direct access to the Tipro controller from an
external computer via serial RS232 port, as per Figure B.6) which is intended for
installation and maintenance purposes. More details can be found in the Chapter C.1 as
well as in the Reference [10].

C. OPERATION C-1
BeFREE 20 – TECHNICAL OVERVIEW
C. OPERATION
C.1. Configuring BeFREE 20
The BeFREE 20 is a rather complex device with a number of programmable
settings/parameters provided for users to configure in accordance to the particular
application. To enable that feature Tipro supplies the respective programming utility
(ChangeMe) which operates only under Windows operating systems. It assists users to
define own set of parameters, save them into a file (for possible replication in the future)
and program into non-volatile memory of the Tipro controller for permanent storage.
It is also possible to dynamically modify certain settings (e.g. display brightness, LED
indicators, touchscreen disable/enable for cleaning purposes …) from the application
software. For that purpose Tipro provides the respective Windows API (HID API) and the
associated documentation.
BeFREE 20 can be programmed/configured externally, from another computer. That
computer needs to operate under Windows with ChangeMe utility installed and have one
serial COM port available. The BeFREE 20 may operate under any operating system or not
have it installed at all. This feature is obviously useful in cases when the BeFREE 20 runs a
non-Windows operating system, but it is also applicable in all Windows cases where
ChangeMe utility is not installed (e.g. to prevent uncontrolled modifications of the
settings). The cable required for programming can be ordered from Tipro (Ordering Code
TM-CGR) or rather easily made. The Reference [10] describes the procedure in detail.
C.2. Applying BeFREE 20
The BeFREE 20 is typically used together with other FREE add-on modules, combined
in various compositions/configurations. An example with Handset modules is shown in
Figure C.1 below, along with its schematic representation (Figure C.2).

C. OPERATION C-2
BeFREE 20 – TECHNICAL OVERVIEW
Figure C.1 Example BeFREE 20 Configuration
Figure C.2 Example BeFREE 20 Configuration – Schematic Representation
USB
Root H b
Generic
USB H b
BeFREE
20
BF20
MainBoard
Tipro
USB
Controller
USB A dio
Device
Handset
TM-HTA
Tipro B s
Mod le
Tipro B s
USB Cable
USB Cable
Handset
TM-HTA
USB A dio
Device
Generic USB
H b
Tipro B s
Mod le
USB A dio
Device
USB A dio
Device
Generic USB
H b
Tipro B s
Mod le

D. OPTIONS D-1
BeFREE 20 – TECHNICAL OVERVIEW
D. OPTIONS
D.1. Inclination Mechanism
BeFREE 20 can be fitted with an Inclination Mechanism (also referred to as Angle
Adjustment Mechanism). Normally, the display surface of BeFREE 20 is inclined for 15
0
against the horizontal plane. The mechanism enables gradual adjustment of the angle from
approximately 30
0
to 70
0
.
Figure D.1 BeFREE 20 with Inclination Mechanism (VESA 75)
D.2. HID Telephony Interface
Actual status (pressed/released) of the PTT key is normally reported as a programmable
sequence of keystrokes generated by a standard USB keyboard, this way emulating a
generic HID Keyboard Device. An example of the application can be found in the
Reference [8] (“Hook and PTT in Software”).
Additionally or alternatively, the PTT status can be reported via HID Telephony
Interface, which is an integral part of the BeFREE 20. See reference [9] (“HID Telephony
Interface”) for more details.

D. OPTIONS D-2
BeFREE 20 – TECHNICAL OVERVIEW
D.3. Echo-Cancellation Circuitry
Acoustic echo is a physical phenomenon inherent to hands-free devices (such as
Intercom) in full-duplex mode, so it needs to be suppressed and/or cancelled. This is
normally implemented in the application software through the specific signal processing
routines. Alternatively, it can be achieved in the hardware using a digital signal processor.
Basic properties of the optional (see Chapter E.1 for details on the respective Ordering
Code) Echo-Cancellation circuitry are listed below.
♦performance: full-duplex
♦sampling rate: 16 kHz
♦acoustic echo-cancellation: ≥40 dB
♦latency: ≤10 ms
Reference signal for the canceller is the sum of signals at the left and the right speaker.
Optionally, the reference might be taken from either of the Speakers.
D.4. Goose-Neck Microphone
By default, the goose-neck microphone is an integral part of the BeFREE 20, but it can
be optionally omitted. See Chapter E.1 for details on the respective Ordering Code.

E. ORDERING CODES E-1
BeFREE 20 – TECHNICAL OVERVIEW
E. ORDERING CODES
E.1. BeFREE 20
1 2 3 4 5 6 7 8 9
B F 2 0 -
J
D 2 -
R
U
0
-
C15C25 -
x x x
1 – Module Type
BF – BeFREE (touchcomputer) module
2 – Model
20 : Integrated Intercom, 15.0” LCD
3 – Embedded Computer
J: Intel Celeron J1900 @ 2.0 GHz with 4 GB RAM
4 – Version & Connectivity
D2 : Fanless version with audio features (“Dispatcher”)
5 – Touchscreen Technology
R: ELO Resistive (zero-bezel)
6 – Integrated Intercom Option
U: USB Speakerbox functionality
C: USB Speakerbox functionality with Echo-Cancellation Circuitry
V: USB Speakerbox functionality without goose-neck microphone
7 – Reserved
0: none
8 – Housing Colour
C15C25 : black (C15) with black matte (C25) top part of the housing
This part of the code is not mandatory if the colour is C15C25, what is a
default.
9 – Custom Version
Three-digit number reserved for product modifications. It is omitted in case of
standard version.
Note 1:
BeFREE 20 requires 12V DC power supply to operate (see Chapter A.2). The respective
AC/DC adapter is included in the packaging, along with the EU power cord. For
installations where AC/DC adapter needs to be placed further away (more than about 1m)
from the BeFREEE 20 Tipro offers the DC power extension cable (Ordering Code TM-
CPH) which is 1.5 m long.