Home and Building Electronic Systems (HBES) - Part 4-1: Media independent layers - Application layer for HBES Class 1

This part of the EN 50090 specifies the services and protocol of the application layer for usage in Home and Building Electronic Systems. It provides the services and the interface to the user process as defined in EN 50090 3 2. This procedure is based on the services and the protocol is provided by the Transport Layer, Network Layer and Data Link Layer as specified in EN 50090 4 2.

Elektrische Systemtechnik für Heim und Gebäude (ESHG) - Teil 4-1: Medienunabhängige Schicht - Anwendungsschicht für ESHG Klasse 1

Systèmes électroniques pour les foyers domestiques et les bâtiments (HBES) - Partie 4-1: Couches indépendantes des media - Couche application pour HBES Classe 1

Stanovanjski in stavbni elektronski sistemi (HBES) – 4-1. del: Nivoji, neodvisni od medijev – Aplikacijski nivo za HBES razreda 1

General Information

Status
Published
Publication Date
19-Feb-2004
Current Stage
6060 - Document made available
Due Date
20-Feb-2004
Completion Date
20-Feb-2004

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SLOVENSKI SIST EN 50090-4-1:2005
STANDARD
september 2005
Stanovanjski in stavbni elektronski sistemi (HBES) – 4-1. del: Nivoji,
neodvisni od medijev – Aplikacijski nivo za HBES razreda 1
Home and Building Electronic Systems (HBES) – Part 4-1: Media independent
layers – Application layer for HBES Class 1
ICS 97.120 Referenčna številka
SIST EN 50090-4-1:2005(en)

© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD EN 50090-4-1
NORME EUROPÉENNE
EUROPÄISCHE NORM February 2004
ICS 35.100.70; 97.120 Supersedes R205-007:1996
English version
Home and Building Electronic Systems (HBES)
Part 4-1: Media independent layers –
Application layer for HBES Class 1
Systèmes électroniques pour les foyers Elektrische Systemtechnik für Heim
domestiques et les bâtiments (HBES) und Gebäude (ESHG)
Partie 4-1: Couches indépendantes Teil 4-1: Medienunabhängige Schicht –
des media – Anwendungsschicht für ESHG Klasse 1
Couche application pour HBES Classe 1

This European Standard was approved by CENELEC on 2003-12-02. CENELEC 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 CENELEC member.

This European Standard exists in one official version (English). A version in any other language made by

translation under the responsibility of a CENELEC member into its own language and notified to the Central

Secretariat has the same status as the official version.

CENELEC members are the national electrotechnical committees 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.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50090-4-1:2004 E
---------------------- Page: 2 ----------------------
EN 50090-4-1:2004 – 2 –
Contents

Foreword........................................................................................................................................................4

Introduction....................................................................................................................................................5

1 Scope .....................................................................................................................................................5

2 Normative references .............................................................................................................................5

3 Terms, definitions and abbreviations .....................................................................................................5

3.1 Terms and definitions...................................................................................................................5

3.2 Abbreviations ...............................................................................................................................6

4 Services of the application layer ............................................................................................................6

4.1 Communication modes ................................................................................................................6

4.2 Service primitives of the application layer....................................................................................7

5 Application layer Protocol Data Unit (APDU) .........................................................................................8

6 Application layer services.....................................................................................................................11

6.1 Application layer services on multicast communication mode...................................................11

6.2 Application layer services on broadcast communication mode .................................................17

6.3 Application layer services on point-to-point connection-less communication mode..................36

6.4 Application layer services on point-to-point connection-oriented communication mode ...........51

6.5 Router-specific application layer services on point-to-point connection-oriented

communication mode.................................................................................................................79

7 Parameters of application layer............................................................................................................80

7.1 Association table........................................................................................................................80

7.2 Verify flag ...................................................................................................................................80

Figure 1 – Interaction of the application layer for services that are not remote confirmed ...........................7

Figure 2 – Interaction of the application layer for services that are remote confirmed .................................8

Figure 3 – APDU (example) ..........................................................................................................................8

Figure 4 – Mapping the ASAP to the TSAP (example) ...............................................................................11

Figure 5 – Mapping a TSAP to an ASAP ....................................................................................................11

Figure 6 – Handling requests and responses..............................................................................................11

Figure 7 – Message flow for the A_Group_Value_Read service ................................................................12

Figure 8 – A_GroupValue_Read-PDU (example) .......................................................................................12

Figure 9 – A_GroupValue_Response-PDU (example), length of ASAP data is more than 6 bit ................13

Figure 10 – A_GroupValue_Response-PDU (example) length of ASAP data is 6 bit or less.....................13

Figure 11 – Message flow for the A_Group_Value_Write service ..............................................................15

Figure 12 – A_GroupValue_Write-PDU (example), length of ASAP data is more than 6 bit......................16

Figure 13 – A_GroupValue_Write-PDU (example), length of ASAP data is 6 bit or less ...........................16

Figure 14 – A_IndividualAddress_Write-PDU (example)............................................................................17

Figure 15 – A_IndividualAddress_Read-PDU (example)............................................................................19

Figure 16 – A_IndividualAddress_Response-PDU (example) ....................................................................19

Figure 17 – Message flow for the A_IndividualAddressSerialNumber_Read service.................................21

Figure 18 – A_IndividualAddressSerialNumber_Read-PDU (example)......................................................22

Figure 19 – A_IndividualAddressSerialNumber_Response-PDU (example)..............................................22

Figure 20 – A_IndividualAddressSerialNumber_Write-PDU (example)......................................................24

Figure 21 – A_ServiceInformation_Indication_Write-PDU (example).........................................................26

---------------------- Page: 3 ----------------------
– 3 – EN 50090-4-1:2004

Figure 22 – A_DomainAddress_Write-PDU................................................................................................27

Figure 23 – A_DomainAddress_Read-PDU (example)...............................................................................29

Figure 24 – A_DomainAddress_Response-PDU (example).......................................................................29

Figure 25 – A_DomainAddressSelective_Read-PDU (example)................................................................31

Figure 26 – A_NetworkParameter_Read-PDU (example) ..........................................................................32

Figure 27 – A_NetworkParameter_Response-PDU (example)...................................................................33

Figure 28 – A_NetworkParameter_Write-PDU (example) ..........................................................................35

Figure 29 – A_PropertyValue_Read-PDU (example) .................................................................................37

Figure 30 – A_PropertyValue_Response-PDU (example)..........................................................................37

Figure 31 – A_PropertyValue_Write-PDU (example)..................................................................................40

Figure 32 – A_PropertyDescription_Read-PDU (example).........................................................................43

Figure 33 – A_PropertyDescription_Response-PDU (example).................................................................43

Figure 34 – A_DeviceDescriptor_Read-PDU (example).............................................................................46

Figure 35 – A_DeviceDescriptor_Response-PDU (example) .....................................................................47

Figure 36 – Message flow for A_Link_Read Service ..................................................................................48

Figure 37 – A_Link_Read-PDU (example)..................................................................................................49

Figure 38 – A_Link_Response-PDU ...........................................................................................................49

Figure 39 – Message flow for A_Link_Write Service ..................................................................................50

Figure 40 – A_Link_Write-PDU ...................................................................................................................50

Figure 41 – A_ADC_Read-PDU (example).................................................................................................52

Figure 42 – A_ADC_Response-PDU (example) .........................................................................................52

Figure 43 – A_Memory_Read-PDU (example) ...........................................................................................54

Figure 44 – A_Memory_Response-PDU (example)....................................................................................55

Figure 45 – A_Memory_Write-PDU (example)............................................................................................57

Figure 46 – A_MemoryBit_Write-PDU ........................................................................................................60

Figure 47 – A_UserMemory_Read-PDU (example)....................................................................................63

Figure 48 – A_UserMemory_Response-PDU .............................................................................................63

Figure 49 – A_UserMemory_Write-PDU .....................................................................................................66

Figure 50 – A_UserMemoryBit_Write-PDU (example)................................................................................69

Figure 51 – A_UserManufacturerInfo_Read-PDU (example) .....................................................................72

Figure 52 – A_UserManufacturerInfo_Response-PDU...............................................................................72

Figure 53 – A_Restart-PDU (example) .......................................................................................................74

Figure 54 – A_Authorize_Request-PDU (example) ....................................................................................75

Figure 55 – A_Authorize_Response-PDU (example) .................................................................................76

Figure 56 – A_Key_Write-PDU (example) ..................................................................................................78

Figure 57 – A_Key_Response-PDU (example) ..........................................................................................78

Table 1 – APCI overview...............................................................................................................................9

Table 2 – Function table for A_MemoryBit_Write-Services ........................................................................59

Table 3 – Function table for A_UserMemoryBit_Write-Services.................................................................68

Table 4 – Association table of keys to access levels ..................................................................................77

---------------------- Page: 4 ----------------------
EN 50090-4-1:2004 – 4 –
Foreword

This European Standard was prepared by the Technical Committee CENELEC TC 205, Home and

Building Electronic Systems (HBES) with the help of CENELEC co-operation partner Konnex Association

(formerly EHBESA).

The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC

as EN 50090-4-1 on 2003-12-02.
This European Standard supersedes R205-007:1996.

CENELEC takes no position concerning the evidence, validity and scope of patent rights.

Konnex Association as Cooperating Partner to CENELEC confirms that to the extent that the standard

contains patents and like rights, the Konnex Association's members are willing to negotiate licenses

thereof with applicants throughout the world on fair, reasonable and non-discriminatory terms and

conditions.
Konnex Association Tel.: + 32 2 775 85 90
Neerveldstraat, 105 Fax.: + 32 2 675 50 28
Twin House e-mail: info@konnex.org
B - 1200 Brussels www.konnex.org

Attention is drawn to the possibility that some of the elements of this standard may be the subject of

patent rights other than those identified above. CENELEC shall not be held responsible for identifying any

or all such patent rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2004-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2006-12-01

EN 50090-4-1 is part of the EN 50090 series of European Standards, which will comprise the following

parts:
Part 1: Standardization structure
Part 2: System overview
Part 3: Aspects of application
Part 4: Media independent layers
Part 5: Media and media dependent layers
Part 6: Interfaces
Part 7: System management
Part 8: Conformity assessment of products
Part 9: Installation requirements
---------------------- Page: 5 ----------------------
– 5 – EN 50090-4-1:2004
Introduction

This document specifies the services and protocol of the application layer for usage in Home and Building

Electronic Systems. Some services are targeted to field level communication between devices. Other

services are exclusively reserved for management purposes. Some services can be used for both

management and run-time communication.
1 Scope

This part of the EN 50090 specifies the services and protocol of the application layer for usage in Home

and Building Electronic Systems. It provides the services and the interface to the user process as defined

in EN 50090-3-2. This procedure is based on the services and the protocol is provided by the Transport

Layer, Network Layer and Data Link Layer as specified in EN 50090-4-2.
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.
Home and Building Electronic Systems (HBES) –
EN 50090-1
Part 1: Standardization structure
EN 50090-3-2:2004 Home and Building Electronic Systems (HBES) –
Part 3-2: Aspects of application – User process for HBES Class 1
Home and Building Electronic Systems (HBES) –
EN 50090-4-2:2004
Part 4-2 Media independent layers – Transport layer, network layer and general
parts of data link layer for HBES Class 1
EN 50090-7-1:2004 Home and Building Electronic Systems (HBES) –
Part 7-1: System management – Management procedures
EN 50173-1:2002 Information technology - Generic cabling systems
3 Terms, definitions and abbreviations
3.1 Terms and definitions

For the purposes of this part the terms and definitions given in EN 50090-1 and the following apply.

3.1.1
application (in the sense of network application)

a system with its associated transmission method which is supported by telecommunications cabling

[EN 50173-1:2002, definition 3.1.2]
3.1.2
user application
software functionality, the control algorithm that runs in one single device
———————
At draft stage.
---------------------- Page: 6 ----------------------
EN 50090-4-1:2004 – 6 –
3.2 Abbreviations
AL Application Layer
AD-converter Analog-to-Digital-converter
APDU Application layer Protocol Data Unit
APCI Application layer Protocol Control Information
ASAP Application layer Service Access Point
Acon Application layer confirmation
con confirmation
CPU Central Processing Unit
HBES Class 1 refers to simple control and command
HBES Class 2 refers to Class 1 plus simple voice and stable picture transmission
HBES Class 3 refers to Class 2 plus complex video transfers
ind indication
Lcon Local confirmation
PDU Protocol Data Unit
Rcon Remote confirmation
req request
res response
TL Transport Layer
TPDU Transport layer Protocol Data Unit
TSAP Transport layer Service Access Point
USERMSG User Message
4 Services of the application layer
4.1 Communication modes

The application layer shall provide a large variety of application services to the application process.

Application processes in different devices interoperate by using services of application layer over

communication modes. According to transport layer, the following different types of communication

modes shall exist:
a) point-to-multipoint, connection-less (multicast);
b) point-to-domain, connection-less (broadcast);
c) point-to-all-points, connection-less (system broadcast);
d) point-to-point, connection-less;
e) point-to-point, connection-oriented.

The application layer services that are offered shall depend on the communication mode. An application

layer service shall not be applied on a communication mode for which it is not specified.

Some services may be used on the point-to-point connection-oriented, as well as the point-to-point

connection-less communication mode, although application layer services shall always be mapped to

transport layer services depending on the type of the communication mode.
---------------------- Page: 7 ----------------------
– 7 – EN 50090-4-1:2004
4.2 Service primitives of the application layer

Each specified application layer service shall be invoked by the transport layer primitives request (req),

indication (ind) and confirmation (con). For a remote confirmed service, the remote device shall use the

same transport layer primitives to respond to the service.

The transport layer confirmation primitive shall only be a confirmation from the transport layer instance

and shall include all data from the request plus the state which indicates whether the service was sent

successfully or not. The application layer shall map the transport layer confirmation primitive to a local

application layer confirmation (Lcon).
Local Remote/Response
Application Process
User of AL User of AL
A_Service.Lcon A_Service.ind
A_Service.req
Application Layer
T_Service.req T_Service.con T_Service.ind
(WRITE_PDU) (WRITE_PDU) (WRITE_PDU)
Transport Layer
Figure 1 – Interaction of the application layer
for services that are not remote confirmed

In case of a remote confirmed service the remote device shall initiate the response (res) primitive and the

application layer shall map this service primitive to a transport layer request primitive. The local

application layer shall receive the transport layer indication primitive and shall map it to an application

layer confirmation (Acon). The transport layer confirmation in the remote device shall be mapped by the

remote application layer to a remote confirmation (Rcon).

NOTE In the following service specifications the local application layer confirmation and the remote confirmation (Rcon) are not

always described.
---------------------- Page: 8 ----------------------
EN 50090-4-1:2004 – 8 –
Local Remote/Response
Application Process
User of AL User of AL

A_Service.req A_Service.Lcon A_Service.Acon A_Service.ind A_Service.Rcon A_Service.res

Application Layer
T_Service.req T_Service.con T_Service.ind
T_Service.ind
T_Service.con
T_Service.req
(READ_PDU) (READ_PDU)
(RESPONSE_PDU)
(READ_PDU) (RESPONSE_PDU)
RESPONSE_PDU
Transport Layer
Figure 2 – Interaction of the application layer
for services that are remote confirmed
5 Application layer Protocol Data Unit (APDU)
An example of an APDU that can be used is shown in Figure 3.
Octet 21
Octet 6 Octet 7 Octet 8 ...
APDU
L-4 L-7
Figure 3 – APDU (example)
---------------------- Page: 9 ----------------------
– 9 – EN 50090-4-1:2004
Table 1 – APCI overview
APCI Application layer Service Allowed communication
mode(s)
(bit position)
Octet n Octet n+1
8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1
0 0 0 0 0 0 0 0 0 0 A_GroupValue_Read X
0 0 0 1 A_GroupValue_Response X
0 0 1 0 A_GroupValue_Write X
0 0 1 1 0 0 0 0 0 0 A_IndividualAddress_Write X
0 1 0 0 0 0 0 0 0 0 A_IndividualAddress_Read X
0 1 0 1 0 0 0 0 0 0 A_IndividualAddress_Response X
1 1 1 1 0 1 1 1 0 0 A_IndividualAddressSerialNumber_Read X
1 1 1 1 0 1 1 1 0 1 A_IndividualAddressSerialNumber_Response X
1 1 1 1 0 1 1 1 1 0 A_IndividualAddressSerialNumber_Write X
1 1 1 1 0 1 1 1 1 1 A_ServiceInformation_Indication_Write X
1 1 1 1 0 1 1 0 1 0 A_NetworkParameter_Read X
1 1 1 1 0 1 1 0 1 1 A_NetworkParameter_Response X X
1 1 1 1 1 0 0 1 0 0 A_NetworkParameter_Write X X
1 1 1 1 0 1 0 1 0 1 A_PropertyValue_Read X X
1 1 1 1 0 1 0 1 1 0 A_PropertyValue_Response X X
1 1 1 1 0 1 0 1 1 1 A_PropertyValue_Write X X
1 1 1 1 0 1 1 0 0 0 A_PropertyDescription_Read X X
1 1 1 1 0 1 1 0 0 1 A_PropertyDescription_Response X X
1 1 1 1 1 0 0 1 0 1 A_Link_Read X X
1 1 1 1 1 0 0 1 1 0 A_Link_Response X X
1 1 1 1 1 0 0 1 1 1 A_Link_Write X X
0 1 1 0 A_ADC_Read X
0 1 1 1 A_ADC_Response X
1 0 0 0 0 0 A_Memory_Read X
1 0 0 1 0 0 A_Memory_Response X
1 0 1 0 0 0 A_Memory_Write X
1 0 1 1 0 0 0 0 0 0 A_UserMemory_Read X
1 0 1 1 0 0 0 0 0 1 A_UserMemory_Response X
1 0 1 1 0 0 0 0 1 0 A_UserMemory_Write X

1 0 1 1 0 0 0 1 0 0 A_UserMemoryBit_Write (not for future use) X

1 0 1 1 0 0 0 1 0 1 A_UserManufacturerInfo_Read X
1 0 1 1 0 0 0 1 1 0 A_UserManufacturerInfo_Response X
1 0 1 1 0 0 0 1 1 1 X
.. .. Reserved USERMSG
1 0 1 1 1 1 0 1 1 1 X
1 0 1 1 1 1 1 0 0 0 X
.. .. manufacturer specific area for USERMSG
1 0 1 1 1 1 1 1 1 0 X
APCI
APCI
data/APCI
data/APCI
data/APCI
data/APCI
data/APCI
data/APCI
data/APCI
data/APCI
Multicast
Broadcast
Point-to-all-
points
connection-less
Point-to-point
connection-less
Point-to-point
connection-
oriented
---------------------- Page: 10 ----------------------
EN 50090-4-1:2004 – 10 –
Table 1 – APCI overview (continued)
APCI Application layer Service Allowed communication
mode(s)
(bit position)
Octet n Octet n+1
8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1
1 1 0 0 0 0 0 0 0 0 A_DeviceDescriptor_Read X
1 1 0 1 0 0 0 0 0 0 A_DeviceDescriptor_Response X
1 1 1 0 0 0 0 0 0 0 A_Restart X
Coupler specific services

1 1 1 1 0 0 0 0 0 0 A_Open_Routing_Table_Req (not for future use) X

1 1 1 1 0 0 0 0 0 1 A_Read_Routing_Table_Req (not for future use) X
1 1 1 1 0 0 0 0 1 0 A_Read_Routing_Table__Res (not for future use) X

1 1 1 1 0 0 0 0 1 1 A_Write_Routing_Table_Req (not for future use) X

1 1 1 1 0 0 1 0 0 0 A_Read_Router_Memory_Res (not for future use) X
1 1 1 1 0 0 1 0 0 1 A_Read_Router_Memory_Res (not for future use) X
1 1 1 1 0 0 1 0 1 0 A_Write_Router_Memory_Req (not for future use) X

1 1 1 1 0 0 1 1 0 1 A_Read_Router_Status_Req (not for future use) X

1 1 1 1 0 0 1 1 1 0 A_Read_Router_Status_Res (not for future use) X

1 1 1 1 0 0 1 1 1 1 A_Write_Router_Status_Req (not for future use) X

1 1 1 1 0 1 0 0 0 0 A_MemoryBit_Write (not for future use) X

1 1 1 1 0 1 0 0 0 1 A_Authorize_Request X
1 1 1 1 0 1 0 0 1 0 A_Authorize_Response X
1 1 1 1 0 1 0 0 1 1 A_Key_Write X
1 1 1 1 0 1 0 1 0 0 A_Key_Response X
Open Media Specific Services
1 1 1 1 1 0 0 0 0 0 A_DomainAddress_Write X
1 1 1 1 1 0 0 0 0 1 A_DomainAddress_Read X
1 1 1 1 1 0 0 0 1 0 A_DomainAddress_Response X
1 1 1 1 1 0 0 0 1 1 A_DomainAddressSelective_Read X

The APDU shall correspond to the Transport layer Protocol Data Unit (TPDU), but shall be reduced by

the transport control field. The application control field shall be encoded and decoded by application layer

and shall contain the application layer service codes (APCI). The application control field shall have a

length of either 4 bit or 10 bit, as specified for each application layer service, in Clause 6.

The codes that shall be used for the application control field are shown in Table 1. The complete Protocol

Data Unit (PDU) for each service primitive is shown in the description of every service.

Not defined and not supported application layer services shall ignored by the application layer.

APCI
APCI
data/APCI
data/APCI
data/APCI
data/APCI
data/APCI
data/APCI
data/APCI
data/APCI
Multicast
Broadcast
Point-to-all-point
connection-less
Point-to-point
connection-less
Point-to-point
connection-oriented
---------------------- Page: 11 ----------------------
– 11 – EN 50090-4-1:2004
6 Application layer services
6.1 Application layer services on multicast communication mode
6.1.1 General

A multicast communication mode shall connect transport layer service access points (TSAP) to

application layer service access points (ASAP). When one device sends an A_GroupValue-Service each

device which is member of this group shall receive the A_GroupValue_Service.

If the application layer of a device receives an A_GroupValue_Write-Service, it shall map the contained

ASAP to exactly one TSAP; it shall search for other associations between ASAPs and the found TSAP

informs all these associated ASAPs. It is specified in 6.1.3 how this shall be done.

Association Table
transmit request
request on TSAP via ASAP 1
update on TSAP 1 ASAP 2
Figure 4 – Mapping the ASAP to the TSAP (example)

If the application layer of a device receives an A_GroupValue_Read-Service, it shall search for all ASAPs

associated to this TSAP and shall inform all the associated ASAPs. Only one read response shall be

generated by the user. It is specified in 6.1.2 how this shall be done.
read ASAP 1
Association Table
read disable
A_GroupValue_Read–Service
with TSAP = 1
11 transmit request response via ASAP 2
read enable
read ASAP 2
ASAP 3 is not informed if a
read response is already obtained
Figure 5 – Mapping a TSAP to an ASAP

If a transmission is requested (read response or write) via an ASAP, the application layer shall take the

associated TSAP, update all the ASAPs with the same TSAP and generate an
A_Group-Service-Request.
Association Table
transmit request
write/response on TSAP 1 20 write/response via ASAP 1
write/response ASAP 2
update on TSAP 1
Figure 6 – Handling requests and responses
---------------------- Page: 12 ----------------------
EN 50090-4-1:2004 – 12 –
6.1.2 A_GroupValue_Read Service
Application layer user TL Application layer user
A_GroupValue_Read.req T_Data_Group.req T_Data_Group.ind A_GroupValue_Read.ind
A_GroupValue_Read-PDU A_GroupValue_Read-PDU
A_GroupValue_Read.Lcon T_Data_
...

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