Powerline Applications European Home Systems (EHS)
Contents
1. _ Powerline Applications wth European Home Systems EHS Dipl Ing Ludwig Brackmann are Home Automation GmbH SS rR presented at International Symposium on Powerline Communication and its Applications _ Essen Germany 2 4 April 1997 Abstract This paper presents in the first part a measurement system for the powerline medium The Powerline Communications Analyzer EHS PLCA 1 is able to do short term and long term _ Measurements on the powerline measuring the signal level and the noise level in the frequency band used by powerline communication l In the second part powerline applications based on the European Home Systems EHS standard are presented The given examples include white goods Miele washing machine dishwasher intelligent plugs a TV user interface and telephone gateway to the EHS powerline medium Also a powerline gateway solution to the M Installation Bus EIB is given Th addition to this paper Dipl Inform Gerrit Telkamp ATICON Home Automation GmbH will give a presentation titled A Low Cost Powerline Node for Domestic Applications 1 Introduction Home automation products need to communicate amoung each other to form a home system In addition to radio frequency the powerline medium is the most suitable medium for different _ reasons Home automation products for retrofitting applications e g zone heating light control or security can be installed without extra and expensive cabeling2. opt power measurement Figure 4 1 This figure shows a load management aan based on the European standard for home automation EHS ATICON has implemented mayor parts of this systems for different manufacturers Applications are load management for white goods remote access via telephone gateway and visualization and control of the home system using a TV user interface or PC user interface 412 ATV User Interface for the Intelligent Home The TV user interface is a low cost set top box for any kind of television set that gives the user easy possibility to contro his home automation system The functions are available by using intuitively graphic menus Switch buttons can be used for light control sliders for temperature and time control setting Information and warning messages can be displayed while watching TV The utility or housing company can provide realtime data on electricity gas or water consumption and send personal or broadcast info messages The TV user interface is connected to a conventional TV set via the SCART connector and uses an IR remote control for inputs In order to be able to build an universal and flexible TV user interface it is necessary to have a small and efficient page description language for pages to be displayed on the TV user interface As the functions of future devices are not know at the moment the domestic appliances have to inform the user interface about their functions and the screen
3. layout at the 29 Powerline Applications with European Home Systems EHS moment of their installation at home A configuration using a PC and a CD is not comfortable So all the necessary information has to come from inside the domestic appliance from the intelligent appliance interface EHS IAI 1 and has to be transmitted via the slow medium powerline All these contraints and demands ask for a page description language using very small resource in terms of memory 7 5 Fig 4 2 The TV User Tnterfice TVUI 1 uses the familiar television set to cerita the intelligent home This page show how to control the washing machine from the living room 4 2 Zone panting Siam Zone heating is not only a powerline application in ihe retrofitting market As the power for operating the valves comes along the same cable as the control data powerline communication has a big advantage here A small and cheap system with four valves four temperature sensors and a heating controller can safe upto 30 percent of energy In retrofitting application it is _ easier to install some new power plugs next to some radiators than to cable the whole appartment or home 4 3 Remote Access to the Home via the Telephone Network PSTN Several application areas ask for remote access to the home via the telephone network Some of them are Remote diagnostics of the heaing system amp white goods remote surveillance and control whole house a
4. products movable by the end user can be moved during their livetime and easily reinstalled by the user white goods user interfaces 2 Powerline communication according to the EHS standard The European Home Systems standard 1 defines installation procedures called registration and enrolment to offer plug amp play installation This feature is very important for home automation products using the powerline medium as those devices can be installed and de installed at any time by the user More details about the EHS protocol can be found in 1 2 3 3 Tne Powerline Communications Anaya EHS PLCA 1 As the power line changes it s characteristic for communication depending on the time of iy and the day of the week there is a need to do short and long time measurements to be able to decide whether reliable power line communication can be used in an industrial or residential _ application The EHS PLCA 1 is designed to do measurements with up to 4 satellite stations Over a time period of more than 10 days Thus the changing transmission characteristics between working days and the weekend can be revealed The PLCA can also be used in February 1997 D ATICON Home Automation GmbH page 1 8 Powerline Applications with European Home Systems aus laboratories or test sites to learn about the powerline and the influence of home appliances and other devices on tlie powerline communication The EHS PLCA 1 can be used for consu
5. 9 Figure 5 3 Communication between master and slave 1 The presented measurements show theat the communication characteristics changes a lot during the day The logged data also shows that the minimum difference between carrier signal level and noise level is always more than 20 dB Resuming the measurements one can say that a safe powerline communication is possible at any time in the areas examined 28 ei Powerline Applications with European Home Sete EHS 4 Powerline oe Inside the Home 41 1 A Miele washing machine and dishwasher communicating via powerline Using the ATICON Intelligent Appliance Interface EHS IAI 1 domestic appliances can be made communicating according to the EHS standard The module is adapted to the serial interface of the home appliance and converts the information of the appliance to the EHS command language using EHS objects and vice versa Intelligent domestic appliances can communicate with a load management controller to do peak load management or adjust the time they are working to a period of lower electricity tarrifs Further more they can inform their owner about unwanted situations alarms malfunction false operation by the user The user can paramerize the load managment nn using e g a TV user nterface feature controller TV user PC user telephone load management interface i interface gateway EHS powerline intelligent plugs for conven tional home appliances
6. Applications for Intelligent Living in Private Homes Institut fiir Elektrische Me technik TU Braunschweig amp VDI VDE IT Braunschweig 1996 8 Brackmann L User Interfaces for Intelligent Homes Conference on ap ahens for Intelligent Living i in Private Homes Braunschweig 1996 9 Telkamp G RF Transceiver for a Common European Standard Conference on Applications for Intelligent Living in Private Homes Institut f r Elektrische Me technik TU Braunschweig VDI VDE IT Braunschweig 1996 10 Happacher M Eine gemeinsame Sprache Die Busse der Heimautomation auf dem Weg zur Einheit Elektronik 4 1997 31
7. EHS PLCA 1S The power line communications analyzer satellite station EHS PLCA 1S has a small size of 200 mm 120 mm 60 mm It has a powerline connector a BNC connector and RS232 gt connector The satellite station has no user interface except of the LCD display as all kind of configuration can be done remote controlled from the master station The LCD with backlite enables reading also in dark environment This backlite has no auto power off a coax BNC powerline RS232 _ N l connector connector no of station Figure 3 2 The satellite station has a 2 16 PA LCD with backlite Configuration and operation is done remotely from the master station The number of the satellite station 1 to 4 is set internaly and displayed in the top right corner of the a 3 2 Measurement Examples and Interpretation In this chapter two measurement example are given The first shows measurements in an appartement house the second in an office building 3 2 1 Measurements in an Appartement House The chosen appartement house has ten appartements each of a size of 60 m Each plant has two appartments The electric meters are placed in the basement From the basement an extra wiring with three phases runs to each appartment So the way of wiring has a star shape To run the measurements the PLCA master station was placed in the kitchen at the ground floor The slave no 1 was placed in the livingroom The distance between the
8. The emitted noise spectrum can ve ca seen in the according frequency band At the master station the noise level is lower than the PLCA can measure The slave station registered a noise signal level of approx 70dByV Further more it can be seen that the TV set transmitts conducted interference also During the whole measurement period communication was possible without any disturbance neither because of too small receiving signal levels nor because of too high noise levels 3 2 2 Measurements in an Office Building The power supply network of this office building has a shape of a star starting from one central service room In the building there are a lot of potential noise emitting and attenuating devices Some of them could be identified fluor scent jas computers _ electrical motors TS A conyers l The master station was placed near rthe central service room Three dav stations were placed about 10 meters away from this room in different offices When people start working i in the morning the noise level at the master stations slocakon near the central service room increases evidently A very interesting effect shows up at approx 13 00 h For about one hour the registered Signal level rises above the signal level measured when the office was closed The reason is not known yet measurement data seen by the slave _ measurement data seen by the master B A B13 S79 HBS DO 93 2 B3 3 5 7 9 713 GB 7
9. ese two devices was approx 6 m 26 Powerline Applications with European san Home Systems EHS The following dbal Tab 3 1 shows the Be data File 12_08 08 MES Transmit level 122 dBuV Slave 1 gt ee ae 2 2 ER apap teal EEE Bi ait 8 a HERE HERE ELCH ES BEE ERBE ERBE Eoo a BEST EC a a Coe a RL a a 53 Ea a S HERE e E EC BEE TO 5 CH DE CE NEST Eee Tab 3 1 EXCEL File with measurement data beginning only measurement values seen by the slave measurement values seen by the master OT l i 5 0 as BE 15 Pa ot i A 30 A 0 3 3 s Gs a b 8 75 4 0 2K 6 BD 2M m GE BU RUE BD 2M MUS th th Figure 3 3 Communication between the master ground floor and slave 1 ground 21008 In figure 3 3 you can see that the carrier signal between the master and the slave no Lis attenuated by PEPER 20 dB Froin 22 30 h to 23 30 h a television set NORDMENDE T4030 was switched on in the living room It is interesting to notice that this has different impact on the attenuation of the two directions of transmission The slave receives the signals of the master station attenuated by 5 dB but the master station gets a signal amplified by 5 dB 27 a E E E E ERIE Powerline Applications with European Home Systems EHS Directly next to the slave station no 1 a notebook with external power supply was running from 8 30 h to 22 00 h
10. larm messages heaing system amp white goods 4 4 A Gateway between the media EIB Twisted Pair and EHS Powerline User Interfaces like a TV user interface should be relocateable at any time by the user Also in new homes equipped with twisted pair bus cabel there are still more electric power outlets than bus connectors As the user wants to be able to change the position of his user interfaces TV user interface PC small LC displays with some keys sirene there has to be a gateway between the twisted pair installation bus and the powerline at some suitable central pont 30 5 TOR 1 Telkamp G A Low Cost Powerline Node for Domestic Applications International Symposium on Powerline Communication and its Applications Essen 1997 l 2 European Home Systems specification 1 3 European Home Systems Association Brussels 1997 3 Kung u a The European Home Systems Network Vertrieb ATICON Er 4 EHS PLCA 1 Powerline Communications Analyzer System for Short amp Long Term Measurement User s Manual ATICON Home Automation GmbH Braunschweig 1996 5 Proceedings Conference on European Home Systems Das intelligente Haus wird Wirklichkeit SGS Thomson Microelectronics ATICON Home Automation GmbH 1995 6 Brackmann L Das European Home Systems Protokoll Conference European Home Systems Das intelligente Haus wird Wirklichkeit Braunschweig 1995 7 Proceedings Conference on
11. mer band communication CENELEC C band Measurement data gained with the EHS PLCA 1 is also useful when working with different powerline system using the C band Adaption for utility communication CENELEC ona will be done in the future 3 1 The main Features of the EHS PLCA 1 The powerline communication analyzer system EHS PLCA consists ore a master station EHS PLCA 1 and up to four satellite stations EHS PLCA 1S There is a power cable for each _ station In addition the master station includes a serial communication cable and a disk with a data transfer software terminal program 3 1 1 Master Station EHS PLCA 1 The power line communications analyzer master station EHS PLCA I has a small size eof 200 mm 120 mm 60 mm It has a powerline connector a BNC connector and RS232 conne tor The user interface is realized with a graphical LCD display and four context sensitive keys The LCD with backlite enables operating also i in dark environment The backlite has auto power off to reduce current consumption u ee coax BNC powerline RS232 A l PR connector connector ON key no 4 Figure 3 1 The power line communications analyzer EHS PLCA 1 works as stand alone device together with up to 4 satellite stations It can be connected to a PC to transfer the long term measurement data 25 Powerline Applications with European Home Systems EHS nn a ET 31 2 Satellite Station
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