Adeunis RF Narrow Band NB868-25mW User manual

Narrow Band
NB868-25mW RF Module
User guide version V2.2.2
Software version V2.3.0
ADEUNIS RF
283 rue Louis Néel - Parc Technologique Pré Roux
38920 CROLLES - France
Tel. : [phone] - Fax : [phone]
www.adeunis-rf.com [e-mail]

NARROW BAND - NB868_25mW - User guide version V2.2.2 - Software version V2.3.0
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Information
Document information
Title NB868_25mW Narrow Band module User guide
Subtitle User guide version V2.2.2
Document type Hardware integration and software management manual
Document status Release for NARROW BAND software version V2.3.0
This document applies to the following products
Name Reference Firmware version
NB868-25mW-RTU ARF7764BAB V2.3.0
Labelling
Disclaimer
This document and the use of any information contained therein, is subject to the acceptance of the Adeunis RF terms and conditions.They can
be downloaded from www.adeunis-rf.com.
Adeunis RF makes no warranties based on the accuracy or completeness of the contents of this document and reserves the right to make
changes to specifications and product descriptions at any time without notice.
Adeunis RF reserves all rights to this document and the information contained herein. Reproduction, use or disclosure to third parties without
express permission is strictly prohibited. Copyright © 2012, Adeunis RF.
Adeunis RF is a registered trademark in the EU and other countries.
Technical Support
Website
Our website contains many useful information : modules and stand alone products information, user guides, configuration software and techni-
cal documents which can be accessed 24 hours a day.
Email
If you have technical problems or cannot find the required information in the provided documents, contact our Technical Support by email. Use
our dedicated email address ([e-mail]) rather than any personal email address of our staff. This makes sure that your request is
processed as soon as possible.
Helpful Information when Contacting Technical Support
When contacting Technical Support please have the following information ready:
• Complete product type & reference (e.g. Narrow Band NB868-25mW - ARF7764BA),
• Firmware version (e.g.V2.3.0)
• Clear description of your question or the problem
• A short description of the application
• Your complete contact details
CE compliancy
Usage restrictions
Product reference
Index Batch number
Product name
868
4B

NARROW BAND - NB868_25mW - User guide version V2.2.2 - Software version V2.3.0
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Narrow Band Modules REGULATORY CONSIDERATIONS
DECLARATION OF CONFORMITY
•NB868-25mw MHz module
We ADEUNIS RF
283 rue LOUIS NEEL
38920 CROLLES FRANCE
declare under our own responsibility that the products
Name Narrow Band NB868-25mW
Reference ARF7764BA
to which this declaration refers conforms with the relevant standards or other standardising documents:
• EN 300 220-2 (V2.3.1) (2010-02)
• EN 60950-1 (2001) + A11 (2004)
• EN62311 (2008)
• EN301 489-1 (v1.8.1) (2008-04)
• EN 301 489-3 (v1.4.1) (2002-08)
According to the RTTE Directive 99/5/EC
Notes:
• According to the 1999/519/EC «RF signal» recommendations, a minimum distance of 10cm between the product and the body is required.
• Receiver class (if applicable): 2
• Demonstration of conformity has been realized with ARF7763AA mounted on NB868 Extension pack ARF7891A
• Usage restrictions : It is the user responsibility to be sure that the configuration and use of the NB868 module fulfill all the requirements
of Rec 70-03 (describing in annex 1, frequency bands, g, g1, g2, g3 or g4) . In certain cases, you may need to notify the final equipment to
European administrations.Adeunis RF can assist you on regulatory aspects
Crolles, January 6th, 2012 VINCENT Hervé - CEO

4 Page of 24
NARROW BAND - NB868_25mW - User guide version V2.2.2 - Software version V2.3.0
Table of contents
Information 2
Labelling 2
Disclaimer 2
Technical Support 2
Narrow Band Modules REGULATORY CONSIDERATIONS 3
NB868-25mw MHz module 3
INTRODUCTION 6
Environmental recommendations 6
Warnings 6
Disposal of waste by users in private households within the European Union 7
EINLEITUNG 7
Hinweise zum Umweltschutz 7
Warnhinweise 8
Entsorgung der Abfälle von Betreibern in Privathaushalten innerhalb der Europäischen Union 8
1. Modules overview 9
1.1. Adeunis RF concept 9
1.2. Module functionality 9
1.3. Module range 9
1.4. NB868-25mW Technical specifications 9
2. Main characterictics 10
2.1. Form factor and footprint 10
2.2. Pins description 10
2.2.1 Pinout of the module 10
2.2.2 Pin configuration 11
2.3. Electrical & Radio characteristics 12
2.3.1 Absolute maximum ratings 12
2.3.2 General specifications 12
2.3.3 Digital specifications 12
2.3.4 Radio characteristics 13
2.4. Power supply 14
2.5. Antenna 14
3. Communication mode 15
3.1. UART interface 15
3.1.1 UART settings 15
3.1.2 UART protocol 15
3.2. Radio interface 15
3.2.1 Packet protocol 15
3.2.1.1 Protocol description 15
3.2.1.2 Non-secured Packet Protocol 15
3.2.1.3 Secured Packet protocol 15
3.2.1.4 Transmission integrity control 16
3.2.1.5 Implementation 16
3.2.1.6 Transmission data path 16
3.2.2 Continuous asynchronous protocol 16
3.2.2.1 Description of the protocol 16
3.2.2.2 Transmission integrity control 16
3.2.2.3 Implementation 16
3.2.2.4 Transmission data path and latency 16
3.3. Addressing 17

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NARROW BAND - NB868_25mW - User guide version V2.2.2 - Software version V2.3.0
3.4. RSSI 17
3.4.1 RSSI continuous 18
3.4.2 Frame RSSI 18
3.5. Scan Free function 18
4. Product Configuration - Command Mode 19
4.1. Command mode input/output 19
4.2. AT Commandes 19
4.3. Description of registers 20
4.4. Configuration coherency 22
5. Firmware upgrade 23
6. Process 23
6.1. Description of module 7764xxx 23
6.2. BOM analysis 23
6.3. Risk linked to number of reflows 23
6.4. Soldering curve 24
7. Version history 24

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INTRODUCTION
All rights to this manual are the exclusive property of ADEUNIS RF. All rights reserved. Copying this manual (without written permission from the
owner) via printing, copying, recording or by any other means, translating this manual (in full or partially) into any other language, including all
programming languages, using any electrical, mechanical, magnetic or optical devices, manually or any by other methods, is prohibited.
ADEUNIS RF reserves the right to change the technical specifications or functions of its products, or to cease manufacturing any of its products,
or to cease technical support for one of its products without notice in writing and urges its customers to make sure that the information they
have is valid.
ADEUNIS RF configuration software and programs are available free of charge in a non-modifiable version. ADEUNIS RF can make no gua-
rantees, including guarantees concerning suitability and applicability for a certain type of application. Under no circumstances can the manufac-
turer, or the distributor of an ADEUNIS RF program, be held liable for any damage caused by the use of the aforesaid program. Program names,
as well as all copyright relating to programs, are the exclusive property of ADEUNIS RF. Any transfer, granting of licences to a third party, leasing,
hire, transport, copying, editing, translation, modification into another programming language or reverse engineering are prohibited without
ADEUNIS RF’s prior written authorisation and consent.
ADEUNIS RF
283, rue Louis Néel
38920 Crolles
France
Telephone [phone]
Fax [phone]
Environmental recommendations
All superfluous packaging materials have been eliminated. We have done everything possible to make it easy to separate the packaging into
three types of materials: cardboard (box), expanded polystyrene (filler material) and polyethylene (packets, foam protective sheets). Your device
is composed of materials that can be recycled and reused if it is dismantled by a specialist company. Please observe local regulations concerning
the manner in which waste packaging material, used batteries and your obsolete equipment are disposed of.
Warnings
Valid for Narrow Band modules with the following references: ARF7764BA
Read the instructions in the manual.
The safety of this product is only guaranteed when it is used in accordance with its purpose.
Maintenance should only be carried out by qualified persons.
Please note, do not install the equipment close to a heat source or in damp conditions.
Please note: for your own safety, you must ensure that the equipment is switched off before carrying out any work on it.
Please note: For your safety, the power supply circuit must be SELV (Safety Extra Low Voltage) and must be a limited power
sources.
Recommendations regarding use
• Before using the system, check that the power supply voltage shown in the user manual corresponds to your supply. If it
doesn’t, please consult your supplier.
• Place the device against a flat, firm and stable surface.
• The device must be installed in a location that is sufficiently ventilated so that there is no risk of internal heating and it must
not be covered with objects such as newspapers, cloths, curtains, etc.
• The device’s aerial must be free and at least 10 cm away from any conducting material.

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• The device must never be exposed to heat sources such as heating equipment.
• Do not place the device close to objects with naked flames such as lit candles, blowtorches, etc.
• The device must not be exposed to aggressive chemical agents or solvents likely to damage the plastic or corrode the metal parts.
• Install your device close to its DC power supply.
Disposal of waste by users in private households within the European Union
This symbol on the product or on its packaging indicates that this product must not be disposed off with
your other household waste. Instead, it is your responsibility to dispose of your waste by taking it to
a collection point designated for the recycling of electrical and electronic appliances. Separate collection and recycling of your waste
at the time of disposal will contribute to conserving natural resources and guarantee recycling that respects the environment and human health.
For further information concerning your nearest recycling centre, please contact your nearest local authority/town hall offices, your household
waste collection company or the shop where you bought the product.
EINLEITUNG
Alle Rechte an diesem Handbuch sind das alleinige Eigentum der ADEUNIS RF. Alle Rechte sind vorbehalten. Jede (ohne die schriftliche Geneh-
migung des Eigentümers erfolgende) Wiedergabe dieses Handbuches durch Druck, Kopie, Aufzeichnung oder jedwedes andere Mittel sowie die
(vollständige oder teilweise) Übersetzung in jede andere Sprache einschließlich aller Programmiersprachen durch Verwendung welcher elektris-
cher, mechanischer, magnetischer, optischer, manueller Vorrichtungen oder anderen Methoden auch immer, sind verboten.
Die ADEUNIS RF behält sich das Recht vor, ohne irgendeine schriftliche Mitteilung die technischen Spezifikationen oder die Funktionen ihrer Pro-
dukte zu verändern, bzw. die Herstellung eines ihrer Produkte einzustellen oder den technischen Support für eines ihrer Produkte auszusetzen
und bittet ihre Kunden inständig sich zu vergewissern, dass die ihnen zur Verfügung stehenden Informationen zutreffend sind.
Die Konfigurations- und Programmsoftware der ADEUNIS RF steht kostenlos in einer Version zur Verfügung, die nicht verändert werden kann.
Die ADEUNIS RF kann keinerlei Garantie und auch keine Garantie zur Eignung und Anwendbarkeit für eine Applikation bestimmten Typs gewäh-
ren. Der Hersteller oder der Verkäufer eines Programms der ADEUNIS RF kann in keinem Fall für irgendwelche Schäden haftbar gemacht werden,
die durch die Anwendung des besagten Programms gegebenenfalls verursacht werden könnten. Die Bezeichnungen der Programme sowie alle
Urheberrechte zu den Programmen sind das alleinige Eigentum der ADEUNIS RF. Jede Übertragung, Gewährung von Lizenzen an einen Dritten,
Leasingvergabe, Vermietung, Übereignung, Kopie, Übersetzung, Modifizierung in eine andere Programmiersprache oder durch ein Reverse Engi-
neering ist ohne die schriftliche Genehmigung und ohne das Einverständnis der ADEUNIS RF verboten.
ADEUNIS RF
283, rue Louis Néel
38920 Crolles
France
Tel [phone]
Fax [phone]
Hinweise zum Umweltschutz
Alle überflüssigen Verpackungsmaterialien wurden vermieden.Wir haben auch alles getan, was uns möglich ist, damit die Verpackung ohne
Weiteres in drei Typen von Werkstoffen getrennt werden kann : Karton (die Schachtel), geschäumtes Polystyrol (Dämmmaterial) und Polyä-
thylen (Beutel, Schaumfolie zum Schutz). Ihr Gerät besteht aus Werkstoffen, die recycelt und weiterverwendet werden können, wenn es von
einem darauf spezialisierten Unternehmen demontiert wird. Beachten Sie bitte die jeweils geltenden örtlichen Vorschriften zur Entsorgung der
Verpackungsmaterialien, der verbrauchten Batterien und Ihres ausgemusterten Gerätes.

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Warnhinweise
Gültig für die Relaisempfänger mit den Artikelnummern : ARF7764BA
Lesen Sie die Anleitungen dieses Handbuches.
Die durch dieses Produkt gewährte Sicherheit kann nur bei einer Anwendung entsprechend dem vorgesehenen Einsatzzweck gewährleistet
werden.
Achtung ! Zu Ihrer eigenen Sicherheit ist es unerlässlich, das Gerät vor jedem technischen Eingriff spannungsfrei zu schalten.
Achtung ! Zu Ihrer eigenen Sicherheit die Stromversorgung Schaltung muss SELV (Safety Extra Low Voltage) sein und muss der begrenzten
Stromquellen sein.
Empfehlungen für den Einsatz
• Vor dem Einsatz des Systems müssen Sie überprüfen, dass die in der Bedienungsanleitung angegebene Anschlussspannung den Werten
Ihrer Stromversorgung entspricht. Anderenfalls wenden Sie sich bitte an Ihren Lieferanten.
• Stellen Sie das Gerät auf einer ebenen, festen und stabilen Fläche auf.
• Um jede Gefahr einer inneren Erwärmung des Gerätes zu vermeiden, ist dieses an einem gut belüfteten Ort aufzustellen und darauf zu
achten, dass keine Gegenstände wie Zeitschriften, Matten, Vorhänge u. a. darauf abgelegt werden.
• Die Antenne des Gerätes muss frei liegen und von jeglichen leitenden Werkstoffen mindestens 10 cm entfernt sein.
• Das Gerät darf niemals der Einwirkung von Wärmequellen oder Heizgeräten ausgesetzt sein.
• Das Gerät darf sich niemals in der Nähe von Gegenständen mit offener Flamme befinden, wie brennenden Kerzen, Schweißbrennern usw.
• Das Gerät darf niemals der Einwirkung von aggressiven Chemikalien oder Lösemittel ausgesetzt werden, die geeignet sein könnten, den
Kunststoff zu beschädigen oder die Metallteile zu korrodieren.
• Stellen Sie Ihr Gerät in der Nähe der Quelle seiner Spannungsversorgung DC auf.
Entsorgung der Abfälle von Betreibern in Privathaushalten innerhalb der Europäischen Union
Dieses Symbol auf dem Produkt oder auf seiner Verpackung weist darauf hin, dass dieses Produkt nicht gemeinsam mit Ihrem anderen
Haushaltsmüll entsorgt werden darf. Stattdessen haben Sie dafür Sorge zu tragen, Ihre Abfälle bei einer Erfassungsstelle zu entsorgen, die auf
das Recycling elektrischer und elektronischer Geräte spezialisiert ist. Die gesonderte Erfassung und das Recycling ihrer Abfälle bei der Ent-
sorgung tragen dazu bei, die natürlichen Ressourcen zu bewahren und ein Recycling zu gewährleisten, das dem Schutz der Umwelt und der
menschlichen Gesundheit dient. Für weitere Informationen zu der Ihrer Wohnung am nächsten gelegene Recyclingstelle wenden Sie sich bitte an
die örtliche Gemeindeverwaltung, an die zuständige Dienststelle für die Müllabfuhr oder an das Geschäft, in dem sie das Gerät gekauft haben

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1. Modules overview
1.1. Adeunis RF concept
The idea is to provide the user with a module which is ready for sending and receiving data over a radio link thus enabling the user to focus on
the development of its application. The aim is to relieve the user of having to deal with the complex radio management.
This specific range of Narrow Band modules has been created to provide extra longe range «point-to-point» transmissions on unlicensed fre-
quency bands and the use of multiple modules in the same environment at maximum power.
1.2. Module functionality
The module consists in a bidirectional RF transceiver implementing an RF-UART gateway. Basically, data sent to the module on its UART inter-
face are transmitted on the air and vis versa.
The module is build around two main components:
• The“Digital”blockbasedonaSTM32F101xmicrocontrollerbelongingtotheARMCortex-M3family.
• The“Radio”blockbasedontheTICC1120radiochipcombinedtoanoptimizedRFfront-end.
The radio block handle RF modulation and demodulation while the digital block drives the radio engine and offers a simplified end user inter-
face with a large panel of functionalities.
The following embedded features are available:
• ProgrammableRFdatarateandmodulation
• ProgrammableUARTdataratewithoptionalFlowcontrol
• ProgrammableRFoutputpower
• LargesetofNarrowBandRFchannelsallowingmultipledifferentsystemtocommunicateinthesameenvironment
• Embeddedprotocolforpointtopointandpointtomulti-pointcommunicationwith“Transparent”and“addressing”mode
• OptionalcontrolofRFdataintegritybyCRCandRFScramblingmode
• “Standbymode”forsavingenergywhenradiotransmissionisnotrequired
1.3. Module range
The Narrow Bands range is made up of 4 modules.
• NB169 - allows data transmission up to 30km (line of sight). Up to 6 radio links (channels) can be used in the same environment.
• NB458 - allows data transmission up to 15km (line of sight). Up to 80 radio links (channels) can be used in the same environment.
• NB868 - allows data transmission up to 20km (line of sight). Up to 19 radio links (channels) can be used in the same environment.
• NB868-25mW - allows data transmission up to 4km (line of sight). Up to 506 radio links (channels) can be used in the same environment.
The modules are pin-to-pin compatible.
1.4. NB868-25mW Technical specifications
Technical specifications
Communication Point-to-point / Point-to-multipoint
Module configuration Through AT commands
Radio data rate 2.4, 9.6, 38.4 and 57.6 kbps
UART data rate 1.2, 2.4, 4.8, 9.6, 19.2, 38.4, 57.6 and 115.2 kbauds
UART TTL port TxD - RxD - RTS - CTS
Adressing mode Transparent or Addressed
Frequencies 868 MHz
Programmable RF output power Up to 25 mW (14 dBm)
Sensitivity Down to -120 dBm @ BER10-3 (data rate 2.4kbps)
Operating range (open space) External antenna: up to 4 km
Operating voltage 3v to 3,6v (3,3v nominal)
Tx/Rx consumption (maxi)/Sleep 48mA / 24mA / 8µA
Operating temperature -40°C / +85°C
Dimensions 32x 16 x 2.8mm (4mm with shield)

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2. Main characterictics
2.1. Form factor and footprint
Footprint of the module
Note : dxf and gerber files are available on request
2.2. Pins description
2.2.1 Pinout of the module
Reserved
Reserved
Reserved
Reserved
GND
Reserved
RSSI
Reserved
Reserved
Reserved
STDBY
CMD
Reserved
Reserved
Reserved
USART1_CTS

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2.2.2 Pin configuration
Pin module Pin name I/O (1) Description
1 GND Ground (2)
2 GND Ground (2)
3 ANTENNA RF output
Must be adapted with 50 ohms matching
4 VCC Supply voltage (2)
5 GND Ground (2)
6 /STANDBY I
Internal pull-down
Standby mode activation/deactivation
May be left unconnected if standby mode is not used
7 /RESET I Reset
Should be connected to the host controller, may be left unconnected if reset not used
8 CMD_MODE I
Internal pull-down
Command mode
Should be connected to the host controller, may be left unconnected if command mode not used
9 BOOT_MODE I
Boot loader activation (note : this pin must not be left unconnected
Must be set to GND for normal operation (pull-down 47k Ohms advised)
Must be set to VCC for firmware upgrade
10 UART_TX O Data output
Must be connected to the host controller
11 Reserved (3)
12 UART_RX I
Internal pull-up
Data input
Must be connected to the host controller, must be left unconnected if not used
13 Reserved (3)
14 UART_RTS O
UART flow control
Must be connected to the host controller if hardware flow control is used, must be left unconnected if not
used
15 Reserved (3)
16 UART_CTS I
Internal pull-down
UART flow control
Must be connected to the host controller if hardware flow control is used, must be left unconnected if not
used
17 Reserved (3)
18 GND Ground (2)
19 GND Ground (2)
20 VCC Supply voltage (2)
21 Reserved (3)
22 Reserved (3)
23 RSSI_PWM O RSSI level of radio channel
Must be connected to the host controller if RSSI has to be used
24 Reserved (3)
25 Reserved (3)
26 Reserved (3)
27 Reserved (3)
28 GND Ground (2)
29 Reserved (3)
8 pins on
both little
side of the
module
GND Ground (4)
(1) Described from the module point of vue (I : Is an input of the module, O is an output of the module) - The internal pull-up/pull-down is
between 30KΩ and 60KΩ, typical 45KΩ.
(2) All GND and VCC pins must be connected
(3) Must be left unconnected or connect to an input of the host controller
(4) Should be connect to GND to get best RF sensitivity

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Symbol Parameter Conditions Min Typ Max Unit
VIL Input low level voltage
TTL ports
-0.5 0.8
V
VIH
Std I/O input level voltage 2 VDD+0.5
I/O FT input high level voltage 2 5.5
VIL Input low level voltage
CMOS ports
-0.5 0.35VDD
V
VIH Input high level voltage 0.65VDD VDD+0.5
Symbol Parameter Conditions Min Max Unit
VOL Output Low level voltage for an I/O pin when 8 pins are sunk at the same time TTL port
IIO=+8mA
2.7 V <VDD<3.6V
0.4
V
VOH
Output High level voltage for an I/O pin when 8 pins are sourced at the same time VDD-0.4
VOL Output Low level voltage for an I/O pin when 8 pins are sunk at the same time CMOS port
IIO=+8mA
2.7 V <VDD<3.6V
0.4
V
VOH
Output High level voltage for an I/O pin when 8 pins are sourced at the same time 2.4
VOL Output Low level voltage for an I/O pin when 8 pins are sunk at the same time IIO=+20mA
2.7 V <VDD<3.6V
1.3
V
VOH Output High level voltage for an I/O pin when 8 pins are sourced at the same time VDD-1.3
VOL
Output High level voltage for an I/O pin when 8 pins are sourced at the same time
IIO=+6mA
2 V <VDD<2.7V
0.4
V
VOH
Output High level voltage for an I/O pin when 8 pins are sourced at the same time
VDD-0.4
2.3. Electrical & Radio characteristics
2.3.1 Absolute maximum ratings
Parameter Min Typ Max Unit Conditions
Supply voltage -0.3 3.9 V
Storage Temperature range -40 -125 °C
Input RF level +10 dBm
Voltage on any pin -0.3 3.9 V
2.3.2 General specifications
Parameter Min Typ Max Unit Conditions
Supply Voltage Range 3 3.3 3.6 V
Temperature Range -40 +85 °C
Transmitter consumption 48 mA (*) @14dBm
Receiver consumption 24 mA
Stand by consumption 8 µA
(*) Consumption measured in conducted mode.
2.3.3 Digital specifications
The table below summarizes all the different electrical input/output generic characteristics of the modules :

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2.3.4 Radio characteristics
Usage up to 25mW: maximum number of channels
The 863-870MHz band is segmented into sub-bands of 25mW, each with their regulatory requirements.The NB868-25mW module makes the
best use of all the possibilities of this band to enable a maximum number of applications. The characteristics are given in the table below:
Parameters Conditions
RF data rate 2.4kbps 9.6kbps 38.4kbps 57.6kbps Modification through AT COMMAND ATS254
Available chan-
nels
Up to 506 Up to 249 Up to 80 Up to 60 Modification through COMMAND ATS200
For each frequency is assigned a channel number «C»
with the formula :
Frequency = 863.0125 + ((C-13)*0.0125)
with C= 13 to 571.
C values available depend on the data rate.
Please refer to the ARF868 channel list for more
information
http://www.adeunis-rf.com/media/downloads/108/
trad_file/fre/arf868_radio_modems_channels_list_
v1.1.pdf
Modulation 2 GFSK 4 GFSK
Range Up to 4km Up to 2km Up to 1km Up to 1km in open field
Duty cycle Up to 1%
Depending on the frequency used and the channel See CEPT Recommendation 70-03 for more information
Spacing 12.5kHz* 25kHz 50kHz 75kHz * spectral occupancy 2.4kbps being slightly greater
than 12.5KHz, Adeunis RF advocates use N-2/N+2
Rejection on
adjacent channel
(N-1/N+1)
46dBc 50dBc 39dBc 39dBc
Alternate channel
rejection (N-2/
N+2)
46dBc 50dBc 39dBc 39dBc
Blocking >75dB @ +/-1 MHZ, +/-2 MHz, +/- 10 MHz (Conducted
measurement)

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ARF7650A
100nH
27pF
100nF
3V3 typ
50 Ohms line
Bent SMA
connector
Capacitor
2.4. Power supply
The module power supply is made between the VCC pin (pins 4 and 20) and GND and must be between 3V and 3.6 V, 3.3 V typical.
As described in the diagram below, we suggest adding a filter cell on the module voltage power supply pin (Vcc).
Each «GND» must be connected by vias to the ground plane of the motherboard (with the shortest distance). The unnumbered «GND» located
at the ends of the module are not required but are recommended for maximum receiver sensitivity.
• If used, the100nH inductor will have a resonant frequency> 1GHz in order to be effective at 869MHz, frequency band of the NB868
module
• The design of the power supply must be able to provide a current up to 50mA, corresponding to the maximum consumption of the module
transmitting at maximum power.
2.5. Antenna
ADEUNIS RF will assist you in your choice of antennas so as to optimize the performance of your products. Feel free to contact us for more
information. We suggest the schematic below:
• The footprint of the inductor and capacitor are useful to ensure good impedance matching between antenna and modules. The values will
depend on the working RF frequency and characteristics of the antenna.
• The SMA connector can be bent or straight depending on the selected antenna but is not essential.We could very well consider 8.6 cm
welded wire antennas directly on the PCB either horizontally or vertically. However and wherever possible, it is interesting to keep the
footprint of SMAs as to facilitate the development for the degrees of freedom offered an application point of view (offset antenna, etc ...).
We would offer the antennas associated with these connectors.
• For a quick set-up, we recommend not to get the self, to install the capacitor to 27 pF (or replace it by a short circuit or a 0 ohm resistor)
and solder a 8.6 cm length wire behind the capacitor.

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3. Communication mode
The RTU module is ready for transmission and reception operations at first power-up without any configuration effort required. It starts in
communication mode allowing to directly sends and receive data. The default UART configuration is set to 9600bps, 8 data bits, 1 stop bit and
no parity.
By default, the module is permanently listening the RF interface and the UART port.
• When an incoming frame is demodulated on the RF interface, the data payload of the frame is transmitted on the UART port.
• When an incoming data is detected on the UART port, it is modulated into a frame on the RF interface.
3.1. UART interface
3.1.1 UART settings
The UART port of the module is the main interface for the host controller.
The communication requires 10 bits for each byte to transmit, including one start bit followed by 8 data bits and then one stop bit. The Start bit
valueisthelogical“0”whilethestopisthelogical“1”value.Thereisnoparitybitinthetransmission.
The data rate settings can be configured with the following rate: 9.6 / 19.2 / 38.4 / 57.6 / 115.2kbps using the S210 register.
Please note that this UART port does not support electrical RS232 characteristics.An external RS232 driver has to be used if RS232 interface is
required.
3.1.2 UART protocol
There is no specific protocol to respect for data transmission and reception. Each byte sent on the UART port is reported on the RF interface and
vis versa.
3.2. Radio interface
3.2.1 Packet protocol
3.2.1.1 Protocol description
NB RTU module uses a packet oriented protocol on its RF interface. The data coming from the UART interface are accumulated in an internal fifo
in the module and then encapsulated in an RF frame.The maximum amount of data that can be transferred into a single radio packet can reach
1024 Bytes.
The maximum packet size can be set up in S218 register from 1 to 1024 bytes. Each new packet introduces some latency in the transmission
delay caused by the RF protocol overhead. The RF protocols encapsulate the data payload with the following elements:
•Apreamblepatternrequiredforreceiverstartuptime
•AbitsynchronizationpatterntosynchronizethereceiverontheRFframe
•Otherprotocoleldsuchassourceaddressanddestinationaddress,payloadlength,optionalCRCandinternalpackettypeeld.
The incoming fifo may accumulate up to 1024 data byte. No more data has to be set in the fifo while a 1024 bytes block of data has not been
released by the radio transmission layer. To prevent from input fifo overrun, the hardware flow control may be activated. In this case, the RTS
signal (pin 14 of the module) will be set when the incoming fifo is almost full to prevent the host controller from sending new data.
3.2.1.2 Non-secured Packet Protocol
In non-secured mode, each packet is transmitted without acknowledgment; The transmitter doesn’t know if packet has been received.
3.2.1.3 Secured Packet protocol
In secured mode, each packet is transmitted and acknowledged by the receiver. If a packet isn’t acknowledged, the module proceeds with two
other attempts.
Following this sequence, the transmitter returns ‘>’ if the packet has been received, or ‘#’ if no acknowledgement has been received after the
three attempts.
Importante note : the addressed mode must be activated in order to use the secured mode.

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3.2.1.4 Transmission integrity control
The RF protocol includes a 16 bits CRC. Each data extracted from an RF packet with an invalid CRC is silently discarded by the module state
machine. The CRC ensures that all the data received are valid. It may be deactivated for user whose protocols already have an integrity control
mechanism or when some error corrections are implemented by user protocols.
3.2.1.5 Implementation
The Packet protocol is selected by the S222 register.
• Non-secured protocol : S222=0
• Secured protocol : S222=2
3.2.1.6 Transmission data path
In packetized mode, the packet size is specified through register S218.
The module starts the transmission of a complete packet when the number of data specified in S218 has been received.
If the number of data is inferior, an incomplete packet will be constituted when time out (specified in register S217) will be reached.
3.2.2 Continuous asynchronous protocol
3.2.2.1 Description of the protocol
The continuous asynchronous protocol enables data transfer from the UART interface to the radio link with the lowest possible latency. It is
associated with radio modulations enabling a wide range of air data rate and ranges to be covered. This is the mode that will allow you to use
the NB868 module to the maximum of its possibilities.
• Intransmission,dataenteringontheUARTisimmediatelytransmittedintothe“air”.
• In reception, data from the RF frames is transmitted progressively to the UART interface.
There is no buffering of complete radio frames before or after transmission on the serial link.
However, the product has buffering enabling a buffer to be performed if the radio and UART data rates are different. The UART interface does
not require a specific protocol. Each octet transmitted is transferred into the air and vice versa.
Thanks to its low latency and the absence of a protocol on the UART port, the NB868 module used with the continuous asynchronous protocol
is completely transparent in the replacement of a wire link.
3.2.2.2 Transmission integrity control
By definition, the continuous protocol can not be cut. There is therefore neither CRC calculation nor control of data integrity.
3.2.2.3 Implementation
The continuous asynchronous protocol is selected by the S222 register.
It can use the following radio data rates: 2.4kbps, 9.6kbps, 38.4kbps and 57.6kbps. The adjustment of the radio data rate is done via the S254
register.
The notions of addressing (broadcast communication, group communication and addressed communication between products) are available and
described below.
3.2.2.4 Transmission data path and latency
Transmission delay from one equipment to another will depend on different factor:
•TheUARTtransmissionrateofthetransmitter
•TheUARTtransmissionrateofthereceiver
•Theradiotransmissionrateandtheradiomodulationused
•Theradioprotocoloverhead(packetsplit,preamble,synchronizationandotherprotocolelds)
•Theinputdatafothresholdandtimeout
An RF transmission can starts according following evens :
•eitheratimeout(S217)
•oraquantityofdatainthebuffermemory(S218)
The first of these two limits reached triggers transmission start.

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When the number of octets in the buffer memory reaches the threshold of register S218 before the timeout of register S217, it is triggering on
data.
On the other hand, when the timeout of register S217 expires before the data in the buffer memory reach the threshold of register S218, it is
triggering on time.
It should be noted that programming register S217 to 0 (no timeout) means that the S218 register threshold must be reached to start transmis-
sion.
3.3. Addressing
The product has various addressing modes that are configurable via the product registers. The following modes are available:
• Transparent mode without sub-network
• Transparent mode with sub-network
• Addressed mode without sub-network
• Addressed mode with sub-network
The transparent modes are intended for inter-product communication: all products are recipients of the frames transmitted.The addressed
modes enable communication to one or more products (creation of sub-groups).
Transparent mode without sub-network
• In the Transparent mode without sub-network all products within range receive the frames from the transmitting products. The configura-
tion required for this mode of communication is as follows :
• S220=0 (transparent mode)
• S253=0 (no group)
Transparent mode with sub-network:
The sub-networks enable groups of products to be created that communicate with each other within the same sub-network. Products in sub-
network 1 cannot see those in sub-network 2 and vice versa. On the other hand all the products are visible between themselves within the
same sub-network.
• S220=0 (transparent mode)
• S253=Number of the sub-network varying from 1 to 255
when register S253 is set to 255, the frame is broadcast to the whole of the sub-network.
Addressed mode without sub-network:
In the addressed mode without sub-network a product communicates with a specified addressee. Only the addressee receives the frames from
the transmitting products.The configuration required for this mode of communication is as follows:
• S220=1 (address mode)
• S253=0 (no sub-network)
• S252=local address (16 bit address)
• S256=address of the recipient (16 bit address)
When register S256 is set to 65535, the frame is broadcast and visible by all equipment within range.
Addressed mode with sub-network:
The products always communicate within the same sub network.This means that two products with identical addresses and different sub-
network numbers do not communicate with each other. The only case of inter-network communication is when S256=255 and S253=255.
• S220=1 (address mode)
• S253= sub network number varying from 1 to 255 (255 is used for broadcast between the sub-network)
• S252= local address (address on 8 bits)
• S256= recipients address (address on 8 bits, 255 is the broadcast address within the sub-network)
3.4. RSSI
The Received Signal Strength Indication or RSSI provides an indication of the RF level in the selected channel.
Depending on the value observed, it indicates the availability of the channel and the noise level in the product’s environment, or the quality of
reception of the frames from a distant product.The terminals are -127dBm for the lower limit and -20dBm for the upper limit
The RSSI is deactivated (by default) by positioning register S230 at: 0

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3.4.1 RSSI continuous
The RSSI is coded on one octet in absolute values of the channel level value in dBm and transmitted to the UART. The RSSI is refreshed conti-
nuously every 10 ms. There is no frame demodulation in this mode.
Selection of the continuous RSSI mode is done by register S230, by setting the value to: 4
3.4.2 Frame RSSI
The frame RSSI is the code on one octet at the beginning of each frame transmitted on the UART. The encoding is identical to the continuous
RSSI.
Selection of the continuous RSSI mode is done by register S230, by setting the value to: 1
3.5. Scan Free function
The Scan Free is a function that is unique to NB868 modules.
This function enables sweeping of all channels available on the product in a few seconds. It is activated by the ATT02 command.
The NB868 module scans all the channels available and returns the RSSI levels on each of the channels to the UART link in the following form: :
Cxxx=-090dBm<cr><lf> ; with xxx = channel no
Cyyy=-101dBm<cr><lf> ; with yyy = No of the following channel
……
The polling time of a channel is defined as 25ms. The result of this polling may show that some channels are more usable than others in a given
environment.
As a second stage and for a more reliable assessment, we can use the ATT03 command which enables one channel to be listened to over a
longer period:
ATT03<c (channel)><t (polling time)>
With : <c> = Channel no
With: <t> = Polling time in seconds
E.g.: ATT03 529 60 -> Scan of channel 529 for 1 minute.The result returned has the following form:
C529=-087/-096/-101dBm<cr><lf>; i.e. in order: RSSI min. RSSI mean/RSSI max. measured over this period.

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4. Product Configuration - Command Mode
The command mode is an embedded tool, accessible by the serial link via a terminal (*), enabling the programming of the module parameters
usingasetofinstructionscalled:“ATcommandset”.ATcommandsareusedtoreadandwritethemodulecongurationregisters.Inthecom-
mand mode, the radio is deactivated (in reception and transmission).
(*): Hercules types
4.1. Command mode input/output
The command mode entry is obtained by applying a rising edge on the CMDE_MODE pin. The pin is debounced for the time configured in the
S240register.Themodulereturnsthe“CM”stringwhenithaseffectivelyenteredcommandmode.Notethatthecommandmodeentrymay
bedifferedwhenanincomingRFframeispushedontheUARTinterface.Inanycase,the“CM<cr><lf>”stringissent.Themodulebacksto
the communication mode on a falling edge on the CMDE_MODE pin with respect of the configured debounce time. The module returns the
“O<cr><lf>”stringwhenithaseffectivelyleavedcommandmode.
The command mode entry may also be done with the UART interface by transmission of a sequence of 3 ASCII characters on the serial link.
Bydefault,thesequenceis:“+++<cr><lf>”,howevertheusercanchooseitsownASCIIcharacterbyreprogrammingregisterS214.TheATO
commandbacksthemoduletothecommunicationmode.Themodulereturnsthe“O<cr><lf>”stringwhenithaseffectivelyleavedcommand
mode.
It should be noted that exiting from the command mode is also possible automatically (timeout) by programming register S202
Command Description Answer
+++ Allows entry into command mode « CM » to confirm entry in command mode.
ATO Exit command mode «O»<cr> if operation OK
«E»<cr> if error
4.2. AT Commandes
AcommandstartswiththetwoASCIIcharacters:“AT”,followedbyoneormorecharactersanddata(seeCbelowforthesyntaxofATcom-
mands available on the module).
Eachcommandshouldendwitha“CR”or“CR”“LF”,thetwopossibilitiesareaccepted.(CRsignies:CarriageReturn,LFsignies:LineFeed)
On receipt of a command the module returns:
• “thedata”<cr><lf>,forareadingcommand,typeATS<n>?,AT/SorAT/V.
• “O”<cr><lf>,forallothertypesofcommandsifitisaccepted.
• “E”<cr><lf>,ifitrefusesthecommandbecauseofasyntaxerror,unknowncommand,unknownregister,invalidparameter,etc.
• “W”<cr><lf>,ifitrefusesthecommandbecausethecongurationrequestedisnotauthorised.
• “CM”<cr><lf>,ifitacceptsentryintothecommandmode
Table of AT commands:
Command Description Reply
ATS<n>? Returns the contents of register nSn=y where y represents the contents of register n
ATS<n>=<m> Transfer the value m to register n «O»<cr> if operation OK
«E»<cr> if error
« W» if the operation has a configuration problem.
AT/S Display as a list, the content of each User register Sxxx=y<cr><lf> for each register
AT/V Display the complete firmware version AdeunisRFNB868<val>?????
ATR Restore the content of registers with default values.
This command must be followed by an AT&W
command and a module reset to ensure that all
parameters have been applied.
«O»<cr> if operation OK
«E»<cr> if error
ATT02 Starts the Scan Free mode «Returns for each channel, its number and RSSI value associated :
Cxxx=-090dBm<cr><lf>
ATT03 <c> <t> Scan of channel «c», during a «t» period , with :
- <c> value on three digits.
- <t> value from 1 to 999, by step of 1s
The command returns three values of RSSI: mini, medium and maximum.

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Command Description Reply
AT&W Save the register configuration in E2PROM. «O»<cr> if operation OK
«E»<cr> if error
AT&RST Restart the module «O»<cr> if operation OK
«E»<cr> if error
ATO Exit command mode «O»<cr> if operation OK
«E»<cr> if error
Example of a series of commands and corresponding replies as one could see them on a terminal:
Syntax of the Command Description Syntax of the response to the next line
+++ Request for entry into command mode CM
ATS254=3 Request for RF data rate at 9.6kbps O
ATS200=9 Request for channel selection = 9 E-> invalid channel !
ATS200=527 Request for channel selection = 527 O
ATS231=4 Request for RF power at 14dBm O
ATS200? Returns S200 register value S200=527
ATS231? Returns S231 register value S231=0
AT&W Storage request of the registers status W (the selected channel is not available at 9.6kbps RF data rate)
The value storage will not be performed.
ATO Request to exit command mode W (the selected channel is not available at 9.6kbps RF data rate)
The Exit will not be performed.
Interpretation of the above example: the user wished to save a new radio configuration (channel 527, power 14dBm) after having made a
parameter error (reply E) and an unauthorised configuration request (reply W). The module allows neither the saving of this invalid configuration
nor the use of the product in the communication mode.
4.3. Description of registers
When switching on the NB868 module operates according to the last configuration saved (factory configuration if its the first switching on, or if
this configuration has not been changed).
Modification commands, type ATS<n>=<m> or ATR allow the content of registers to be modified. The product is usable with each new
configuration as long as it is not disconnected.
On the other hand the modified values will be applied next time the module is switched on only if they have been saved AT&W command
List of the registers accessible on the NB868 module :
Register Content Default value Comments
S200
Channel number : 11 and from 13 to 571
11
Some channels will not be available depending on the data
rate and the selected power.
The module will return an error message
if illegal choice.
S202
Timeout to exit command mode :
0 : no timeout, exit through ATO or AT&RST
1 : Automatic programmable output from 1 to 65565 sec. 0 See note 2
S204 Preamble duration
0 : Automatic preamble 0