SIST EN 13757-4:2005
(Main)Communication systems for meters and remote reading of meters - Part 4: Wireless meter readout (Radio meter reading for operation in the 868 MHz to 870 MHz SRD band)
Communication systems for meters and remote reading of meters - Part 4: Wireless meter readout (Radio meter reading for operation in the 868 MHz to 870 MHz SRD band)
This European Standard specifies the requirements of parameters for the physical and the link layer for systems using radio to read remote Meters. The primary focus is to use the Short Range Devices (SRD) unlicensed telemetry band, 868 MHz to 870 MHz. The standard encompasses systems for walk-by, drive-by and fixed installations. As a broad definition, this European Standard can be applied to various application layers.
Kommunikationssysteme für Zähler und deren Fernablesung - Teil 4: Zählerauslesung über Funk (Fernablesung von Zählern im SRD-Band von 868 MHz bis 870 MHz
Diese Norm legt die Anforderungen an die Parameter der physikalischen Schicht und der Verbindungsschicht für Systeme fest, die zur Fernablesung von Zählern über Funk dienen. Das Hauptaugenmerk liegt hierbei auf der Verwendung von Funkanlagen mit geringer Reichweite (SRD) (en: Short Range Devices) im freien Frequenzband von 868 MHz bis 870 MHz. Diese Norm umfasst Systeme für eine Vorbeigeh-, Vorbeifahr- und feste Installation. Sie kann weitgehend für unterschiedliche Anwendungsschichten angewendet werden.
Systemes de communication et de télérelevé des compteurs - Partie 4: Echange de données des compteurs par radio (Lecture de compteurs dans la bande SRD 868 MHz a 870 MHz)
Préparer une norme pour les couches physiques (couches basses) des communications uni- et bi-directionnelles pour l'échange des données des compteurs par radio fréquence.
Communication systems for meters and remote reading of meters - Part 4: Wireless meter readout (Radio meter reading for operation in the 868 MHz to 870 MHz SRD band)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 13757-4:2005
01-november-2005
Communication systems for meters and remote reading of meters - Part 4:
Wireless meter readout (Radio meter reading for operation in the 868 MHz to 870
MHz SRD band)
Communication systems for meters and remote reading of meters - Part 4: Wireless
meter readout (Radio meter reading for operation in the 868 MHz to 870 MHz SRD band)
Kommunikationssysteme für Zähler und deren Fernablesung - Teil 4: Zählerauslesung
über Funk (Fernablesung von Zählern im SRD-Band von 868 MHz bis 870 MHz
Systemes de communication et de télérelevé des compteurs - Partie 4: Echange de
données des compteurs par radio (Lecture de compteurs dans la bande SRD 868 MHz a
870 MHz)
Ta slovenski standard je istoveten z: EN 13757-4:2005
ICS:
33.200 Daljinsko krmiljenje, daljinske Telecontrol. Telemetering
meritve (telemetrija)
35.100.10 )L]LþQLVORM Physical layer
35.100.20 Podatkovni povezovalni sloj Data link layer
SIST EN 13757-4:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 13757-4:2005
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SIST EN 13757-4:2005
EUROPEAN STANDARD
EN 13757-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2005
ICS 33.200; 35.100.10; 35.100.20
English version
Communication systems for meters and remote reading of
meters - Part 4: Wireless meter readout (Radio meter reading
for operation in the 868 MHz to 870 MHz SRD band)
Systèmes de communication et de télérelevé des Kommunikationssysteme für Zähler und deren
compteurs - Partie 4: Echange de données des compteurs Fernablesung - Teil 4: Zählerauslesung über Funk
par radio (Lecture de compteurs dans la bande SRD 868 (Fernablesung von Zählern im SRD-Band von 868 MHz bis
MHz à 870 MHz) 870 MHz)
This European Standard was approved by CEN on 21 February 2005.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13757-4:2005: E
worldwide for CEN national Members.
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SIST EN 13757-4:2005
EN 13757-4:2005 (E)
Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 General.4
4 Mode S .9
5 Mode T .14
6 Mode R2 .21
7 All modes : Connection to higher OSI layers .26
Annex A (informative) Frequency allocation and band usage.27
Annex B (informative) Flag, assignment of the "unique User/Manufacturer ID", three letter codes.28
Annex C (informative) Mode S example .29
Annex D (informative) Mode T1 Example.31
Bibliography .33
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EN 13757-4:2005 (E)
Foreword
This European Standard (EN 13757-4:2005) has been prepared by Technical Committee CEN/TC 294
“Communication systems for meters and remote reading of meters”, the secretariat of which is held by
AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by December 2005, and conflicting national standards shall be withdrawn
at the latest by December 2005.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland
and United Kingdom.
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1 Scope
This European Standard specifies the requirements of parameters for the physical and the link layer for
systems using radio to read remote Meters. The primary focus is to use the Short Range Devices (SRD)
unlicensed telemetry band, 868 MHz to 870 MHz. The standard encompasses systems for walk-by, drive-by
and fixed installations. As a broad definition, this European Standard can be applied to various application
layers.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 13757-3:2004, Communication systems for and remote reading of meters - Part 3: Dedicated application
layer
EN 60870-5-1, Telecontrol equipment and systems – Part 5: Transmission protocols – Section
1: Transmission frame formats (IEC 60870-5-1:1990)
EN 60870-5-2, Telecontrol equipment and systems – Part 5: Transmission protocols – Section 2: Link
transmission procedures (IEC 60870-5-2:1992)
ISO/IEC 646, Information technology - ISO 7-bit coded character set for information interchange
CEPT/ERC/REC 70-03 E, Relating to the use of short range devices (SRD)
ETSI EN 300 220-1, V1.3.1:2000, ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Short
range devices (SRD); Radio equipment to be used in the 25 MHz to 1 000 MHz frequency range with power
levels ranging up to 500 mW; Part 1: Technical characteristics and test methods
ETSI EN 300 220-2, V1.3.1:2000, ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Short
range devices (SRD); Radio equipment to be used in the 25 MHz to 1 000 MHz frequency range with power
levels ranging up to 500 mW; Part 2: Supplementary parameters not intended for conformity purposes
ETSI EN 301 489-1, V1.4.1:2002, Electromagnetic compatibility and Radio spectrum Matters ERM;
ElectroMagnetic Compatibility (EMC) standard for radio equipment and services; Part 1: Common technical
requirements
ETSI EN 301 489-3, V1.3.1:2001, Electromagnetic compatibility and Radio spectrum Matters (ERM);
ElectroMagnetic Compatibility (EMC) standard for radio equipment and services; Part 3: Specific conditions
for Short-Range Devices (SRD) operating on frequencies between 9 kHz and 40 GHz
3 General
3.1 Introduction
The "Meters" may communicate with "Other" system components, for example mobile readout devices,
stationary receivers, data collectors or system network components. For the meter side, it is assumed that the
communication function will work without any operator’s intervention or need for battery replacement over the
full lifetime of the radio part of the meter. Other components such as the mobile readout or stationary
equipment may have a shorter battery lifetime or require an external power supply as dictated by the technical
parameters and use.
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Three different modes of operation are defined for the communication with the meter. Many of the physical
and link layer parameters of these different modes of this document are identical, allowing the use of common
hardware and software. However, due to the operational and technical requirements of these modes some
parameters will differ.
a) "Stationary mode", mode S is intended for unidirectional or bi-directional communications between
stationary or mobile devices. A special transmit only sub-mode S1 could be optimised for stationary
battery operated devices with a long header and the sub-mode S1-m is specialised for mobile receivers.
b) "Frequent transmit mode", mode T. In this mode, the meter transmits a very short frame
(typically 2 ms to 5 ms) every few seconds thus allowing walk-by and/or drive-by readout.
Transmit only sub-mode T1. It is the minimal transmission of a meter ID plus a readout value, which is sent
periodically or stochastically.
The bi-directional sub-mode T2 transmits frequently a short frame containing at least its ID and then waits for
a very short period after each transmission for the reception of an acknowledge. Reception of an acknowledge
will open a bi-directional communication channel.
c) "Frequent receive mode", mode R2. In this mode, the meter listens every few seconds for the reception of
a wakeup message from a mobile transceiver. After receiving such a wakeup, the device will prepare for
a few seconds of communication dialog with the initiating transceiver. In this mode a “multi-channel
receive mode” allows the simultaneous readout of several meters, each one operating on a different
frequency channel.
Meters or other communication devices may support one, multiple or all of the described modes.
3.2 Meter communications types
The following Table describes the key features of each mode and sub-mode.
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Table 1 — Meter communication type
Mode WAY Typical Chip- Duty Maximum Data coding
Description
a
Application rate cycle duty cycle
b
+
kcps
Header
S1 1 Transmit 32,768 1 % 0,02 % Manchester Transmit only; transmits a number of
only meter times per day to a stationary receiving
+
for stationary point. Transmits in the 1 % duty cycle
receiving frequency band. Due to long header, it is
Long header
readout suitable also for battery economised
receiver.
S1-m 1 Transmit 32,768 1 % 0,02 % Manchester Transmit only; transmits with a duty cycle
only meter limitation of 0,02 % per hour to a mobile
+
for mobile or or stationary receiving point. Transmits in
stationary the 1 % duty cycle frequency band.
short header
readout Requires a continuously enabled receiver.
S2 2 All meter 32,768 1 % Manchester Meter unit with a receiver either
types. continuously enabled or synchronised
+
Stationary requiring no extended preamble for
reading wakeup. Also usable for node
short header or
transponders or concentrators. A long
option long
header is optional.
header
T1 1 Frequent 100 0,1 % 3 to 6 Transmit only with short data bursts
transmission < 5 ms every few seconds, operates in the
+
(short frame 0,1 % duty cycle frequency band.
meters)
short header
T2 2 Frequent Meter: 0,1 % 3 to 6 Meter unit transmits on a regular basis
transmission like Type T1 and its receiver is enabled
Tx : 100 +
(short frame for a short period after the end of each
meter with 2 transmission and locks on, if an
Short header
way acknowledge (at 32,768 kcps) is received.
capability)
Further bi-directional communication in
the 0,1 %-frequency band using 100 kcps
(meter transmit) and 32,768 kcps (meter
Meter 1 % Manchester
receive) may follow. Note that the
communication from the meter to the
Rx : +
"other" component uses the physical layer
32,768
Short header
of the T1 mode, while the physical layer
parameters for the reverse direction are
identical to the S2-mode.
R2 2 Frequent 4,8 1 % Manchester Meter receiver with possible battery
reception economiser, requiring extended preamble
+
for wake-up. Optionally, it may have up to
(long range)
10 frequency channels with a high
Medium
precision frequency division multiplexing.
header
Meter response with 4,8 kcps wake-up
followed by a 4,8 kcps header.
All Multi-mode A system component may operate
option simultaneously, sequentially or by
command in more than one mode as long
as it fulfils all the requirements of each of
these modes.
a
The duty cycle limitation shall conform to the frequency band allocation defined for operation in the
868 MHz to 870 MHz SRD bands according to CEPT/ERC/REC 70-03 E.
b
The duty cycle per meter shall be limited to 0,02 % per hour to limit the total occupancy of the channel to < 10 % with 500 meters
installed within transmission range.
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Figure 1 below illustrates the operation between the different modes and components.
Figure 1 — Meter communication types
3.3 Performance classes
The transmitters shall belong to one of three class levels ranging from low and medium to high radiated
power.
The maximum allowable radiated power for the transmitter is defined by CEPT/ERC/REC 70-03 E or as
permitted by local radio regulation.
When existing, the receiver shall belong to one of three classes in sensitivity and blocking performance, from
low and medium to high.
The performance class of the transmitter and the receiver may be different.
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Description of performances – the class of receivers and transmitters defines power, sensitivity and
selectivity.
The transmission power shall be measured as the effective radiated power (ERP) according to 8.3 of
ETSI EN 300 220-1, V1.3.1:2000.
The maximum usable sensitivity shall be measured in conducted mode according to 4.1 of
ETSI EN 300 220-2, V1.3.1:2000. In addition, the manufacturer shall state the antenna gain, which can be
measured according to ANSI C63.5.
Table 2 — Transmitter performance classes
Transmitter Typical Description Minimum ERP
Application
Class P
erp
L Lowest Limited transmission power - 5 dBm
T
performance
M Medium Medium transmission 0 dBm
T
performance power
H Highest Highest transmission meter to other + 5 dBm
T
performance power
other to meter + 8 dBm
Table 3 — Receiver performance classes
a
Typical Description
-2)
Receiver Antenna gain
Maximum usable sensitivity at (BER < 10
Application
Class b
dBi
OR at ( Block acceptance rate > 80 %)
G
a
P
0
c
L Lowest Limited sensitivity, - 80 dBm
R
performance minimum blocking
performances
c
M Medium Medium - 90 dBm
R
performance sensitivity, good
blocking
performances
c
H Highest Best sensitivity see Tables 6, 10 and 15
R
performance and best blocking
performances
a In practice, the sensitivity shall be measured in conducted mode according to 4.1 of EN 300 220- 2, V1.3.1:2000. For the user, an
important parameter is the radiated sensitivity, that could be estimated by combining the conducted sensitivity and the antenna gain.
b If the conducted mode is not possible, the sensitivity shall be measured by sending a signal with a known field strength to the
receiver, according to 4.2 of EN 300 220-2, V1.3.1:2000. The radiated sensitivity could then be measured via the block acceptance rate.
c The antenna gain shall be stated by the manufacturer.
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4 Mode S
4.1 Mode S: General
The radio part of a meter shall, for all parameters, as a minimum conform to the requirements of ETSI EN 300
220, Part 1 and Part 2, even if some application requires extended temperature or voltage range.
Table 4 — Mode S, General
Characteristic Min Typical Max. Unit
a
Frequency band 868,0 868,3 868,6 MHz
b
Transmitter duty cycle S2 0,02 1 %
c
Transmitter duty cycle S1 & S1-m 0,02 %
a
This European Standard is optimised for the 868 MHz to 870 MHz band, although
with an appropriate transmission licence, other frequency bands could be used, i.e.
433 MHz.
b
Duty cycle as defined by ETSI EN 300 220-1.
c
The duty cycle is limited to 0,02 % per hour to limit the total occupancy of the
channel, see Table 1 footnote b.
NOTE See the graphics in Annex A for frequency and power recommendations.
4.2 Mode S: Transmitter
The parameters for the transmitters shall be as listed in Table 5 below:
Table 5 — Mode S, Transmitter
Characteristic Mode Sym Min Typ Max Unit Note
-6
Centre frequency 868,25 868,30 868,35 MHz
~ 60 × 10
(ppm)
(transmit only meter, S1-submode)
-6
Centre frequency 868,278 868,300 868,322 MHz ~ 25 × 10
(ppm)
(other and S2-mode)
FSK Deviation ±40 ±50 ±80 kHz
Chip rate transmit f 32,768 kcps
chip
Chip rate tolerance ±1,5 %
a
Digital bit jitter ±3 us
b
Data rate (Manchester) f × ½ bps
chip
Preamble length including bit / byte- S2, 48 chips
sync, both directions S1-M
Preamble length including bit/byte- S1 PL 576 chips Optional for
sync S2
c
Postamble (trailer) length 2 8 chips
d
Response delay t 3 50 ms
RO
a The bit jitter shall be measured at the output of the micro-controller or encoder circuit.
b Each bit shall be coded as 2 chips (Manchester encoding).
c The postamble (trailer) shall consist of n=1 to 4 "ones" i.e. the chip sequence is n*(01).
d Response delay: after transmitting a frame in the S2-mode, the receiver shall be ready for the reception of a response in a time
shorter than the minimum response delay, and shall be receiving at least for the duration of the maximum response delay.
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4.3 Mode S: Receiver
Table 6 — Mode S, Receiver
Characteristic Class Symb Min Typ Max Unit Note
-2
H P
Sensitivity (BER < 10 ) or (Block accep- -100 -105 dBm
R o
tance rate > 80 %)
a
Blocking performance L 3 Class
R
a c
Blocking performance M 2 Class
R
a b c
Blocking performance H 2 Class
R
Acceptable Chip rate tolerance D ± 2 %
fchip
f
Chip rate (meter) 32,768 kcps
chip
a
Receiver class according to ETSI EN 300 220-1, V1.3.1:2000, 9.3
b
Additional requirement for class H receivers: Adjacent band selectivity shall be > 40 dB when measured according
R
to ETSI EN 300 220-1, V1.3.1:2000, 9.2.
c
Additional requirement for class M and class H receivers: The equipment shall meet the immunity requirements as
R R
specified in ETSI EN 301 489-1, V1.4.1:2002, 9.2
4.4 Mode S: Data encoding
4.4.1 Mode S: Manchester encoding
Manchester encoding shall be used for this mode to allow simple encoding/decoding and occupy a narrower
base-band. Each bit shall be encoded as either a "10" chip sequence representing a "zero" or as a "01"
representing a "one". The lower frequency shall correspond to a chip value of "0".
4.4.2 Mode S: Order of transmission of the encoded data
Each data byte shall be transmitted with the most significant bit first.
The byte sequence of the CRC shall be transferred with the high byte first. The byte sequence of the
manufacturer field shall be transferred with the low byte first. The byte sequence of other multi-byte fields is
not defined in this document. Such multi-byte fields should be transferred with the low byte first.
4.4.3 Mode S: Preamble chip sequences
The total preamble (header + synchronisation) chip sequence for this mode shall be n×(01) 0001110110
10010110:
with n ≥ 279 for the sub-mode S1 (long header)
with n ≥ 15 for the sub-mode S2 (short header)
with n ≥ 279 for the sub-mode S2 optional long header
All chips of each frame, including pre- and postamble, shall form an uninterrupted sequence.
NOTE 1 In Manchester coding, the chip sequence 000111 is invalid but it is used near the end of the header to allow a
receiver to detect the start of a new or a stronger transmission. This applies even during reception of a weaker
transmission. The capture effect allows efficient communication even in a channel where many weak transmitters from a
large area might otherwise effectively block the reception of a nearer (stronger) transmitter. In addition it allows pulsed
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receivers to distinguish safely between the start of a valid frame and the detection of an accidental “sync” sequence within
an ongoing transmission.
NOTE 2 The data encoding is the same as used in mode R2 and mode T2.
4.5 Mode S: Data link layer
4.5.1 General
The link layer of EN 60870-5-1 with the format class FT3 shall be used.
4.5.2 Mode S: Frame format
4.5.2.1 General
The general format of the frame shall be as follows:
4.5.2.2 Mode S: First block
L-field C-field M-field A-field CRC-field
1 byte 1 byte 2 bytes 6 bytes 2 bytes
Figure 2 — Mode S: First block format
4.5.2.3 Mode S: Second block
CI-field Data-field CRC-field
1 byte 15 or if it is the last block (((L-9) modulo 16) –1) bytes 2 bytes
Figure 3 — Mode S: Second block format
4.5.2.4 Mode S: Optional block(s)
Data-field CRC-field
16 or if it is the last block ((L-9) modulo 16) bytes 2 bytes
Figure 4 — Mode S: Optional block(s) format
4.5.3 Mode S: Field definitions
4.5.3.1 General
The fields as defined in EN 60870-5-1 (L-field) and EN 60870-5-2 (C-field, M-field and A-field) are specified in
the subsequent subclauses. The A-field of EN 60870-5-2 corresponds to the concatenation on the M-field and
the A-field presented here.
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4.5.3.2 Mode S: L: Length field
The first byte of the first block is the length field. The field specifies the number of subsequent user data bytes
including the control and address bytes and excluding the CRC bytes. If ((L-9) MOD 16) isn't zero, then the
last block shall contain ((L-9) MOD 16) data bytes + 2 CRC bytes. All the other blocks except the first block
shall always contain 16 data bytes + 2 CRC bytes.
4.5.3.3 Mode S: C: Control field
The second byte of the first block is the C-field. It specifies the frame type. According to EN 60870-5-2 the
following C-field codes shall be used:
for the transmit only sub-mode S1 the C-field value C = 44 (SEND/NO REPLY) shall be used;
h
if the meter is in the installation mode then:
for bi-directional mode S2, the C-field value C = 06 shall be used to signal this mode;
h
for unidirectional mode S1, the C-field value C = 46 shall be used to signal this mode.
h
For the sub-mode S2 all C-field values of EN 60870-5-2 may be used.
4.5.3.4 Mode S: M: Manufacturer ID
The third and the fourth byte of the first block shall contain a unique User/Manufacturer ID of the meter. The
15 least significant bits of these two bytes shall be formed from a three letter ISO 646 code (A…Z) as
specified in EN 13757-3:2004, 5.5. See Annex B for administration of these three letter codes.
If the most significant bit of this two bytes User/Manufacturer ID is equal to zero, then the address A shall be a
unique (hard coded) manufacturer meter address of 6 bytes. Each manufacturer is responsible for the
worldwide uniqueness of these 6 bytes. Any type of coding or numbering, including type/version/date may be
used as long as the ID is unique.
If the most significant bit of this two-byte User/Manufacturer ID is different from zero, then the
6-byte address shall be unique at least within the maximum transmission range of the system (soft address).
This address is usually assigned to the device at installation time. As long as these unique address
requirements are fulfilled, the remaining bytes may be used for user specific purposes.
4.5.3.5 Mode S: A: Address
This address A shall be unique (at least within the maximum transmission range). Each User/Manufacturer
shall guarantee that this ID is unique. If this protocol is used together with the Application Layer of EN 13757-
3, and if the CI-field has one of the values 72 , 78 or 7A then the following shall apply: the A-field shall be
h h h
generated as a concatenation of the 'Identification number', 'Version number' and 'Device type information' as
specified in 5.4, 5.6 and 5.7 of EN 13757-3:2004.
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4.5.3.6 Mode S: Cl: Control information
The first byte of the second block is the CI-field. The CI-field specifies the type of protocol and thus the nature
of the information that follows. The value of the CI-field shall be as specified in Table 7:
Table 7 —Cl-field
CI Value Designation Remarks
51 Data sent by the Readout device to the meter without For compatibility with the EN 13757-3
h
fixed header (to be defined) Application Layer standard
71
Reserved for Alarm Report For compatibility with the EN 13757-3
h
Application Layer standard
72 EN 13757-3 Application Layer with full header For compatibility with the EN 13757-3
h
Application Layer standard
78
EN 13757-3 Application Layer without header For compatibility with the EN 13757-3
h
(to be defined) Application Layer standard
7A EN 13757-3 Application Layer with short header For compatibility with the EN 13757-3
h
Application Layer standard
81
Relaying Application Layer For future development
h
82 For future use For compatibility with
h
CENELEC TC 205 standards
A0 - B7 Manufacturer specific Application Layer
h h
4.5.3.7 Mode S: CRC: Cyclic redundancy check
The CRC shall be computed over the information from the previous block, and shall be generated according to
FT3 of EN 60870-5-1. The formula is:
16 13 12 11 10 8 6 5 2
The CRC polynomial is: x + x + x + x + x + x + x + x + x + 1
The initial value is:0
The final CRC is complemented
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5 Mode T
5.1 Mode T: General
The radio part of a meter shall, for all parameters, as a minimum conform to the requirements of ETSI EN 300
220, Part 1 and Part 2, even if some applications require extended temperature or voltage range:
Table 8 — Mode T, General
Characteristic Mode Min Typ Max Unit
a
Frequency band: meter to other T1, T2 868,7 868,95 869,2 MHz
a
Frequency band: other to meter T2 868,0 868,3 868,6 MHz
b
Transmitter duty cycle: meter to other T1, T2 0,1 %
b
Transmitter duty cycle: other to meter T2 1 %
a
This European Standard is optimised for the 868 MHz to 870 MHz band, although with an appropriate
transmission licence, other frequency bands could be used, i.e. 433 MHz.
b
Duty cycle as defined by ETSI EN 300 220-1.
NOTE See the graphics in Annex A for frequency and power recommendations.
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5.2 Mode T: Transmitter
The parameters for the transmitters shall be as listed in Table 9:
Table 9 — Mode T, Transmitter
Characteristic Mode Sym Min Typ Max. Unit Note
-6
Centre frequency: T1, T2 868,90 868,95 869,00 MHz ~ 60 × 10
(ppm)
(meter to other)
-6
Centre frequency: T2 868,278 868,300 868,322 MHz
~ 25 × 10
(ppm)
(other to meter)
FSK Deviation: T1, T2 ± 40 ± 50 ± 80 kHz
(meter to other)
FSK Deviation: T2 ± 40 ± 50 ± 80 kHz
(other to meter)
f
Chip rate transmit: T1, T2 90 100 110 kcps
chip
(meter to other)
Rate variation within header + frame: T1, T2 D 0 ±1 %
fchip
(meter)
a
Data rate: T1, T2 f × 2/3 bps
chip
(meter to other, 3 out of 6 encoding)
Chip rate transmit: T2 32,768 kcps
(other to meter)
Chip rate tolerance (other to meter) T2 ± 1,5 %
b
Digital bit jitter: T2 ± 3 µs
Data rate T2 f × ½ bps
chip
(other to meter, Manchester encoding)
Preamble length including bit/byte-sync, T1, T2 PL 48 chips
both directions
c
Postamble (trailer) length T1, T2 2 8 chips
d
Acknowledge delay T2 t 2 3 ms
ACK
a
Each nibble (4 bits) shall be coded as 6 chips, see Table 11
b
The bit jitter shall be measured at the output of the microprocessor or encoder circuit.
c
The postamble (trailer) shall consists of at least of at least two alternating chips. If
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