Metering systems 0447EN October 2013 M-BUS centralisation System overview

Metering systems 0447EN October 2013 M-BUS centralisation System overview In an system, there can be only one Master device. Introduction (the abbreviation of Meter-Bus ) is the European Standard for the remote reading of heat meters. It is also used for other types of consumption meters, and for devices (like sensors, actuators or regulators) fitted in HVAC systems. The system is designed to offer a simple, handy way of ensuring the mains connection and remote reading of meters residential applications and similar, with the aim of overcoming the restraints imposed by direct (sight) meter reading. The system fully complies with European Standard EN 1434 Heat meters - Part 3: data exchange and interfaces. Advantages There are various Bus systems - of the open or owner type - available on the market for building automation, safety, alarm monitoring, and so on. is specifically designed for the centralisation of consumption data and meter operating parameters, and it offers a series of distinctive characteristics: a high level of safety for data transmission; low costs for the laying of the Bus cable and the connection of the devices; long distances, without the need for signal amplifiers; a high number of devices that can be centralised; different types of connection that can be combined (star, tree, linear); data transmission speed suitable for the application; automatic detection and recognition of the devices connected. Main characteristics Type of communication Connection cable Communication in the signal network is of the Master-Slave type between the central unit (Master) and the measuring devices (Slaves) Use a twisted 2-wire non-shielded cable The official documentation on the system is published by the Usergroup - the international organisation of users and manufacturers of devices (see also www.m-bus.com). Branching To branch the connection cable, use standard terminals junction boxes; the IP protection degree of the boxes should be chosen on the basis of the environmental installation conditions Master-Slave Bus system The system belongs to the field Bus family, made up of information transmission systems based on a common medium; the devices for receiving and transmitting information are connected to this medium. The information is codified in digital format and transmitted as data telegrams in serial mode. The transmission method is asynchronous and half-duplex, controlled by the Master device. The medium is a simple 2-wire cable to which all the devices are connected in parallel. Topology Addressing The topology of the signal network can assume a linear, tree or star configuration; ring configuration is not allowed. The termination of the line is not necessary. To unmistakably distinguish the Slave devices connected to the, it is necessary to implement the initial start-up. See page 4 SLAVE SLAVE SLAVE Transmission speed The transmission speed on the network may be 300, 2400, 9600 Baud, depending on the number and type of devices, the distances, the section and the cable route MASTER Reference Standards is a Standard defined in UNI EN 1434 SLAVE SLAVE Data acquisition The acquisition of data from the Slave devices may be manual or automatic Figure 1 - Schematic outline of an system is an open system: the technical specifications and communication protocol are publicly available. Thanks to this, the devices of different manufacturers can be connected on the network, and can thereby exchange information. is a Master-Slave system; communication is controlled by a single device (Master) that cyclically interrogates the other devices (Slaves) to gather the information. A Slave cannot communicate on its own initiative - it must wait to be interrogated by the Master. Alongside the data concentrator function, the Master usually offers additional functions such as data storage (data-logger) and remote control via a telephone line and a modem. 1

Metering systems 0447EN October 2013 M-BUS centralisation System overview Topology The devices can be connected on the basis of a star, tree or Bus-row network topology, or any combination of these. The ring closure of the signal network is not allowed. Star configuration Connection cable To connect the devices, you are advised to use a non-shielded cable with 2 twisted wires. The most common wire sections are: - 16 AWG (corresponding to 1,310 mm²) - 18 AWG (corresponding to 0,823 mm²) where AWG is the acronym of American Wire Gauge (the American system for classifying cable diameters and sections). When choosing the most suitable section, bear in mind the number of devices and the distance from the central unit (Master). See also table 1. to make tracking easier, you are advised to label the cables and terminals used for wiring. In the points where a connection is made between two parts of an line, or between the signal network and an device, it is a good idea to use terminals and junction boxes for the electricity installation. For the electric connections, the Giacomini modules and user satellites have a terminal board inside a plastic container (IP55 protection degree) fixed to the box. The star configuration of several lines connected to the central unit is always recommended, because in this way just the specific line can be switched off (selective disconnection) in the event of a fault or maintenance, and any problems can be identified more easily. Example: terminal board in the user module Terminal board for electric connections Tree configuration Bus-row configuration The modules and satellites are supplied with a plastic connection point in place of the meter flow rate measurement section on the heating/airconditioning return unit. The energy meter must be ordered separately; on the worksite, it is assembled and connected to the specific terminals reserved for in the IP55 box. Warning. The cable cannot be laid in the same conduit as the mains power supply cable (230 V AC, 50 Hz). You are advised to maintain a distance of at least 2 m from the inverter and other power devices, to avoid any possible electrical interference. Warning. The devices must not be connected in a ring configuration. 2

Metering systems 0447EN October 2013 M-BUS centralisation System overview Signal network planning With regards signal network planning, remember that there are numerous interdependent parameters: the size of the building, the number and type of devices, the distance from the central unit, the transmission speed, the type and section of cable, the length and route of the segments. Transmission speed The communication interface of the devices is compatible with a transmission speed between 300 and 9600 Baud. The Giacomini devices communicate at a speed of 2400 Baud. Type of building Small residential buildings Large residential buildings Small complexes Large complexes Medium-sized area Point-to-point connection Warning. If the connection cable is laid outside the building, the devices may be subjected to overvoltages caused by lightning, so they must be adequately protected. Maximum distance between the central unit and the first device [m] Total cable length [m] 350 1000 350 4000 Section 16 AWG or 18 AWG 16 AWG 18 AWG Number of devices (Slaves) Connection Note, for example, the first row of table 1: the maximum distance between the first Slave device (meter) connected to the line and the central unit is 350 m; this distance is applied for a standard configuration with a transmission speed between 300 and 9600 Baud, a maximum of 250 Slave devices connected, and a total line length (the sum of all the segments, measured along the cable) less than - or equal to - 1000 m. The maximum distance can be increased by choosing a cable with a larger section and/or using fewer Slave devices. The voltage on the Bus must not be less than 24V DC at any point. 250 250 64 1000 4000 16AWG 64 3000 5000 16AWG 64 5000 7000 16 AWG 16 10000 10000 16 AWG 1 Table 1 - Relation between the variables of an system Central units The GE552-4 central units act as data concentrators, level converters, data-loggers and user interfaces for reading purposes. They allow you to read the devices connected to the network, thanks to the keyboard and display on the front. This means that all the devices can be read from one single position, eliminating the need to move around the building, open the box doors, or even enter a private home in the case of internal installation. The central units differ for the maximum number of devices that can be connected to them; in fact the central unit should be chosen when you know the exact number of devices to be connected for data centralisation. If the energy meters of the GE552 range are used as Slave devices, refer to the information below. For other Slave devices to be centralised but not supplied by Giacomini (such as electricity and gas meters, sensors, actuators, etc.), refer to the relative instructions. For buildings or building complexes with more than 250 devices to be connected to the, or in the case of particularly extensive systems, you can use repeaters. Central unit code The need to assign a primary address arises mainly when there is a system of a higher level (e.g. supervision) that must interrogate all the devices. In this case, the primary address offers an advantage because it is made up of just 3 figures so allows the devices to be identified more quickly. Warning. The central unit must be installed less than 2 m from inverters or other power devices. Max no. of devices that can be connected Technical datasheet code Outputs for lines GE552Y006 20 0287IT 3 GE552Y007 60 0288IT 3 Picture The network does not require any termination, so line-end resistors are not needed. GE552Y008 120 0289IT 4 Addressing system The system offers two types of address so that the central unit can unmistakably distinguish the devices connected: a primary address and a secondary address. GE552Y010 250 Table 2 - Central units GE552-4 Primary address The primary address is made up of 3 figures. At consignment, the GE552 energy meters have no assigned primary address. Secondary address The secondary address is made up of 8 figures and is assigned to each meter in the factory; it corresponds to the manufacture number and is different for each device. Barring exceptions, this is the address that the central unit uses to individually interrogate the various devices to obtain the consumption data and other information. 3

Metering systems 0447EN October 2013 M-BUS centralisation System overview Initial start-up Before the initial start-up of the system, make sure that: the material (devices and central unit) has been supplied, installed and electrically connected; the product and project documentation has been read; the meters (energy and sanitary water) have been installed in the right direction (arrow on the brass section corresponding to the flow direction); a cross-reference table has been drawn up for the meters and the apartments (manufacture number - apartment identification). For the initial system start-up, the GE552-4 central units have a function enabling them to automatically recognise the devices connected to the Bus. The search is made via the secondary address, and detects the devices connected. If one or more devices are not detected, you must insert the missing addresses manually; to do this, always use the secondary addresses, as shown on the front of the device (as they correspond to the manufacture number). Consumption data acquisition MANUAL acquisition Locally, on the display of the central unit, by pressing the keys on the front of the device AUTOMATIC acquisition 1. Locally, via a PC connected to the central unit 10184429 2 6 3 5 5 m x 0,0001 x 0,1 x 0,001 x 0,01 2. Remote, via a PC connected to the telephone line with the aid of an analogue modem The central unit is connected to the telephone line via an analogue modem. Figure 2 The manufacture number shown on the front of the meter corresponds to the secondary address Analogue modem Telephone line Analogue modem The initial start-up must always be carried out in the presence of the hydraulic and electric installers who set up the system. 3. Remote, via a PC connected to the telephone line with the aid of a GSM modem The central unit is connected to the telephone line via a GSM modem. Problem-solving during the initial start-up If one or more devices are not detected by the central unit search, check the following: electric connection of the device(s) and/or line; insufficient voltage (the value must be between 24 and 42 V DC); short-circuit on the line. Modem GSM Telephone line Modem GSM Additional information For further information, visit the website www.giacomini.com or contact the technical service:' +39 0322 923372 6 +39 0322 923255 * consulenza.prodotti@giacomini.com This information is intended as an example. Giacomini S.p.A. reserves the right to modify the contents - at any time and without prior warning - for technical or commercial reasons. The information in this technical sheet does not exempt the user from scrupulously observing the existing regulations and standards relating to good technical practices. Giacomini S.p.A. Via per Alzo, 39-28017 San Maurizio d Opaglio (NO) Italy 4

0287EN February 2011 FOR MAX 20 M-BUS DEVICES LED Power (green) central unit is supplied Slave (yellow) An network device is transmitting Max (yellow) Max. current exceeded Short (red) Short circuit or overload GE552Y006 Description (GE552Y006) central unit can work both as simple level adaptor, functioning as interface between the different electric levels of system and serial communication system, and as datalogger able not only to read data of counters connected to network, but also to store them. communication is guaranteed for max. 20 devices (with nominal current equal to 1,5 ma per unit). The access to device functions is by means of the keyboard composed of 4 buttons to navigate menus, or with a direct connection to a computer which can keep up serial communication, or finally, using a remote connection through modem. The two latter connections are established through serial connection () by means of two apposite connectors and using a specific free software (FService). The central unit has two levels of access: one just for read-only menu functions, the other one to access to all functions available in the menu included device configuration ones. Data reading can occur either manually in real time or automatically by setting one among 22 intervals available, going from one minute to one year. Data storage is 1 MB, with 20 energy meters, we can assess that at least the last 540 readings made are stored. Max. and min. communication Baud rate can be set on with three available options: 300, 2400, 9600 Baud rate. Main features Data concentration and level adaptor Reading interval with values between one minute and one year Storage of values measured by each meter Data storage FLASH 1 MByte Remote connection through 10-Bit modem Possibility to update Software communication guaranteed up to 20 units* Short circuit protection External supply 24 V Respected standards: EN1434-3 Emissions DIN EN50081-1, EN 55022 class B, EN 60555 Inlets DIN EN50082-2, ENV 50140, ENV 50204, EN 61000-4-4 Size: (LxHxP) = 105 x 94 x 58 (mm) Protection class: IP20 Material/colour: Noryl / light grey (similar to RAL 7035) - Weight: 0,23 kg Dati tecnici Supply tension: 13..28 V AC, 9 W 10..28 V DC, 5 W Operative temperatures: 0..+45 C Storage temperature: -10..+60 C Humidity: 10..70% (without condensation) Baud rates available: 300, 2400, 9600 Connections GND TX RX Earth line of serial interface Data Line for reception (PC transmission) Data Line for transmission (PC reception) RS485 S+,S- RS485 interface terminals (observe polarity) Power PC Modem M+,M- terminals (3 inlets). Signs +, - distinguish lines Supply earth terminal N, L Supply terminal (230 Vac) connector (Female) serial communication interface with computer connector (Male) serial communication interface with modem Malfunctioning detection If errors or malfunctioning occur the device indicates them as follow: LED is off: Check the supply cable maybe the internal fuse. State: overload : Check wiring if short circuits or discharges occurred. Damaged devices can cause eddy currents. Short circuits sources can be easily detected by removing the contacts of terminals alternatively. One or more devices are not detected by automatic search procedure: Try again. Check baud rate and ID of the missing device (at most it can be added to the list of detected meters manually). No answer from the device: Check baud rate and ID of the device. Check that bus tension is between 24 V and 42 V. State: Error : If the display shows State: Error push $ and C at the same time to see the error list. Note down the error code and delete it pushing ". 1

0287EN February 2011 FOR MAX 20 M-BUS DEVICES Access to functions When central unit is not reading or communicating and no errors have been detected, the display shows Register. Data R3.2 State:ok. Accordingly to the access mode arranged, if a button is pushed three different situations occur. The Datalogger allows three possible access modes through keyboard: Dimensions 106 mm Standard. central unit is produced with this set mode. When accessing if a button is pushed the display shows an access code request. Access to menu functions is possible through 2 code protected levels: access code A and access code B. If the number of access code A is typed, the access is limited to the level of read-only functions. Data related to a specific connected meter or data of all meters connected to M-bus network can be read, but the configuration cannot be changed or slaves list cannot be modified. On the contrary, the complete menu is available and the configuration can be modified, by accessing through access code B. Access through ID. If this access mode is set, when a button is pushed to access to the device, the display shows an ID code request. If the user types the secondary address of the meter that wants to display, data related to this meter are shown. On the contrary, if the user types E, access code request is displayed and the situation is the one described in standard mode. Access through address. If this access mode is set, when a button is pushed to access to the device, the display shows a primary address request (from 0 to 254). If the user types the secondary address of the meter that wants to display (providing he has got it), relative data of this meter are shown. On the contrary, if the user types " for three times, access code request is displayed and the situation is the one described in standard mode. Operations through keyboard The keyboard is composed of 4 buttons to navigate the menu shown by the display of the device. Using the buttons the following operations can be done: Button E allows to enter menu sections and to confirm what is shown on the display both modifications and selected headings; Button C allows to quit menu sections; Button $ allows to navigate the current section of the menu selecting the next heading or it allows to scroll decimal digits, in case numbers are inserted; Button " allows to navigate the current section of the menu selecting the previous heading or it allows to select the next digit moving towards left, in case numbers are inserted. 94 mm C MODEM M+ M+ M+ M- M- M- C PC Technical specifications central unit, functioning as either level adaptor or datalogger for data reading and storage of max 20 devices connected to network (nominal current for each device equal to 1,5 ma). Local control through 4 buttons on the frontal part of the device or through computer with serial direct connection; remote control through modem connection is possible. Two access profiles: for read-only functions or for all functions available in the menu, configuration included. Manual data reading in real time or automatic one according to a set interval. Max. and min. communication Baud rate that can be set on : 300, 2400, 9600 baud. interfaces for PC connection and for Modem connection, 3 inlets for lines. 1 MB data storage. Size (LxHxP) 105 x 94 x 58 mm. Product code: GE552Y006 E V+ V- Power C Additional information For additional information please check the Giacomini website at the following address: www.giacomini.com +39 0322 923 372 6 +39 0322 923 255 * consulenza.prodotti@giacomini.com This pamphlet is merely for information purposes. Giacomini S.p.A. retains the right to make modifications for technical or commercial reasons, without prior notice, to the items described in this pamphlet. The information described in this technical pamphlet does not exempt the user from following carefully the existing regulations and norms on good workmanship. Giacomini S.p.A. Via per Alzo 39, I-28017 San Maurizio d Opaglio (NO) Italy 2

0288EN February 2011 FOR MAX 60 M-BUS DEVICES LED Power (green) central unit is supplied Slave (yellow) An network device is transmitting Max (yellow) Max. current exceeded Short (red) Short circuit or overload GE552Y007 Description (GE552Y006) central unit can work both as simple level adaptor, functioning as interface between the different electric levels of system and serial communication system, and as datalogger able not only to read data of counters connected to network, but also to store them. communication is guaranteed for max. 60 devices (with nominal current equal to 1,5 ma per unit). The access to device functions is by means of the keyboard composed of 4 buttons to navigate menus, or with a direct connection to a computer which can keep up serial communication, or finally, using a remote connection through modem. The two latter connections are established through serial connection () by means of two apposite connectors and using a specific free software (FService). The central unit has two levels of access: one just for read-only menu functions, the other one to access to all functions available in the menu included device configuration ones. Data reading can occur either manually in real time or automatically by setting one among 22 intervals available, going from one minute to one year. Data storage is 512 KB, with 60 energy meters, we can assess that at least the last 80 readings made are stored. central unit is supplied by 230 Vac electric network. Max. and min. communication Baud rate can be set on with three available options: 300, 2400, 9600 Baud rate. PC PowerSlave Max Short Protection fuse Main features Functions: data concentrator, datalogger and level adaptor Reading interval: with values between one minute and one year Data storage: FLASH 512 KB Remote connection: through 10-Bit modem Software: it can be updated communication: guaranteed up to 60 devices connected to network* Inlets: 3 per Interfaces: 1 and 1 RS485 Size (LxHxP): 166 x 190 x 112 mm Protection degree: IP53 Material / colour: PS / light grey Weight: 1,3 kg Short circuit protection: through fuse Respected standards: : EN1434-3 Emissions: DIN EN50081-1, EN 55022 class B, EN 60555 Inlets: DIN EN50082-2, ENV 50140, ENV 50204, EN 61000-4-4 Technical data Supply tension: 230 Vac, 50 Hz, 25 W Operative temperatures: 0..+ 45 C Storage temperature: -10..+ 60 C Relative humidity: 10...70% (without condensation) Baud rate: to be chosen among 300, 2400, 9600 baud Dimensions 166 mm 112 mm MODEM GND TX RX S+ S- (PC) RS485 M+ M- M+ M- M+ M- N L Connection E C GND TX Earth line of serial interface Data Line for reception (PC transmission) 190 mm Datalogger RX Data Line for transmission (PC reception) RS485 S+,S- RS485 interface terminals (observe polarity) Power PC Modem M+,M- terminals (3 inlets). Signs +, - distinguish lines Supply earth terminal N, L Supply terminal (230 Vac) connector (Female) serial communication interface with computer connector (Male) serial communication interface with modem * The number of devices can be increased by using apposite repeaters. 1

0288EN February 2011 FOR MAX 60 M-BUS DEVICES Malfunctioning detection If errors or malfunctioning occur the device indicates them as follow: All LEDs are off: Check the supply cable and the internal fuse. Red LED is on: Check wiring and if short circuits or discharges occurred. Damaged devices can cause eddy currents. Short circuits sources can be easily detected by removing the contacts of terminals alternatively. Yellow LED (Max) on without flashing: Bus current is higher than nominal current allowed. Check the number of devices connected to the network. Up to 60 devices can be connected to a specific loading unit (1,5 ma), but if devices with two specific loading units (3 ma) are connected, no more than 30 devices can be connected. One or more devices are not detected by automatic search procedure: Try again. Check baud rate and ID of the missing device (at most it can be added to the list of detected meters manually). No answer from the device: Check baud rate and ID of the device. Check that bus tension is between 24 V and 42 V. State: Error : If the display shows State: Error push $ and C at the same time to see the error list. Note down the error code and delete it pushing ". Access to functions When central unit is not reading or communicating and no errors have been detected, the display shows Register. Data R3.2 State:ok. Accordingly to the access mode arranged, if a button is pushed three different situations occur. The Datalogger allows three possible access modes through keyboard: Standard. central unit is produced and sent with this set mode. When accessing if a button is pushed the display shows an access code request. Access to menu functions is possible through 2 code protected levels: access code A and access code B. If the number of access code A is typed, the access is limited to the level of read-only functions. Data related to a specific connected meter or data of all meters connected to M-bus network can be read, but the configuration cannot be changed or slaves list cannot be modified. On the contrary, the complete menu is available and the configuration can be modified, by accessing through access code B. Access through ID. If this access mode is set, when a button is pushed to access to the device, the display shows an ID code request. If the user types the secondary address of the meter that wants to display, data related to this meter are shown. On the contrary, if the user types E, access code request is displayed and the situation is the one described in standard mode. Access through address. If this access mode is set, when a button is pushed to access to the device, the display shows a primary address request (from 0 to 254). If the user types the secondary address of the meter that wants to display (providing he has got it), relative data of this meter are shown. On the contrary, if the user types " for three times, access code request is displayed and the situation is the one described in standard mode. Operations through keyboard The keyboard is composed of 4 buttons to navigate the menu shown by the display of the device. Using the buttons the following operations can be done: Button E allows to enter menu sections and to confirm what is shown on the display both modifications and selected headings; Button C allows to quit menu sections; Button $ allows to navigate the current section of the menu selecting the next heading or it allows to scroll decimal digits, in case numbers are inserted; Button " allows to navigate the current section of the menu selecting the previous heading or it allows to select the next digit moving towards left, in case numbers are inserted. Technical specifications central unit, functioning as either level adaptor or datalogger for data reading and storage of max 20 devices connected to network (nominal current for each device equal to 1,5 ma). Local control through 4 buttons on the frontal part of the device or through computer with serial direct connection; remote control through modem connection is possible. Two access profiles: for read-only functions or for all functions available in the menu, configuration included. Manual data reading in real time or automatic one according to a set interval. Max. and min. communication Baud rate that can be set on : 300, 2400, 9600 baud. interfaces for PC connection, RS485 interface, 3 inlets for lines. 512 KB data storage. 230 Vac network supply. Protection fuse. Size (LxHxP) 166x190x112 mm. Product code: GE552Y007 Additional information For additional information please check the Giacomini website at the following address: www.giacomini.com +39 0322 923 372 6 +39 0322 923 255 * consulenza.prodotti@giacomini.com This pamphlet is merely for information purposes. Giacomini S.p.A. retains the right to make modifications for technical or commercial reasons, without prior notice, to the items described in this pamphlet. The information described in this technical pamphlet does not exempt the user from following carefully the existing regulations and norms on good workmanship. Giacomini S.p.A. Via per Alzo 39, I-28017 San Maurizio d Opaglio (NO) Italy 2

0289EN February 2011 FOR MAX 120 DEVICES (GE552Y008) FOR MAX 250 DEVICES (GE552Y010) GE552Y008 - GE552Y010 Main features Functions: data concentrator, level adaptor Reading interval: with values between one minute and one year Remote connection: through modem Software: it can be updated communication: guaranteed up to 120 devices (GE552Y008) or up to 250 devices (GE552Y010) connected to network* Inlets: 4 per Supported communication interfaces: RS485 Baud rate values available: 300, 2400, 9600 baud Data storage: 256 KB Respected standards: EN1434-3 Emissions DIN EN50081-1, EN 55022 class B, EN 60555 Inlets DIN EN50082-2, ENV 50140, ENV 50204, EN 61000-4-4 Technical data Supply tension to central unit: 42 V DC (± 5%) Supply current to central unit: max 630 ma Supply power to central unit: max 30 W Supply to transformer inlet: 230 Vac, 50 Hz Current to transformer inlet: 300 ma Tension to transformer outlet: 42V DC Current to transformer outlet: 650 ma Operative temperatures: 0..+55 C Storage temperature: -20..+60 C Size (LxHxP): 214 x 240 x 94 (mm) Protection class: IP52 Material / colour: Plastic / charcoal (similar to RAL7024) Weight: 1,4 kg Description central unit (both GE552Y008 and GE552Y010) can work both as simple level adaptor, functioning as interface between the different electric levels of system and serial communication system, and as datalogger able not only to read data of meters connected to network, but also to store them. communication is guaranteed for max. 120 devices for GE552Y008 and 250 devices for GE552Y010 (with nominal current equal to 1,5 ma per unit). The access to device functions is by means of the keyboard, or with a direct connection to a computer which can keep up serial communication, or finally, using a remote connection through modem. The two latter connections are established through serial connection () by means of two apposite connectors and using a specific free software (FService). The central unit enables to access only to the reading of each meter through primary or secondary address. In addition to this function, access to configuration functions of the device is possible. Data reading can occur either manually in real time or automatically by setting one among 6 intervals available, going from one minute to one year. Data storage is 256 KB, with 250 energy meters, we can assess that at least the last 8 readings made are stored. central unit is supplied by 230 Vac electric network. Max. and min. communication Baud rate can be set on with three available options: 300, 2400, 9600 Baud rate. + - Connection (Modem) SERVICE E 42V M+,M- 4 inlets to M-bus network, independent polarity GND TX RX CTS RTS Earth line of serial interface Data Line for reception (PC transmission) Data Line for transmission (PC reception) Handshake terminal from PC Handshake terminal to PC DTR Terminal for data ready to be transmitted from PC DSR DCD + + + (Modem) CTS TxD DCD DSR - - - RTS RxD DTR GND Service Terminal for data ready to be transmitted to PC (DATA CARRIER DETECT) terminal to detect data to be transmitted to PC (modem online) Connector of interface of the modem Connector of interface of the PC Supply earth terminal Supply +,- Supply terminals (42 V DC) 42V Supply + + 42V Supply Dimensions 240 mm 214 mm 94 mm ON F1 F2 7 8 9 4 5 6 1 2 3 0 C E LED On Slave (green) (yellow) If on the unit transmits logic 1 If off the unit transmits logic 0 If on a device connected to network transmits logic 0 If off a device connected to network transmits logic 1 Max (yellow) Max. operative current exceeded Short (red) If fl ashing current overload If on Bus tension = 0 V *Possibility to meter up to 1000 devices by connecting apposite repeaters to the central unit. 1

0289EN February 2011 FOR MAX 120 DEVICES (GE552Y008) FOR MAX 250 DEVICES (GE552Y010) Malfunctioning detection If errors or malfunctioning occur the device indicates them as follow: All LEDs are off: Check the supply cable. Red LED is on: Check wiring and if short circuits or discharges occurred. Yellow LED (Max) on without flashing: Bus current is higher than nominal current allowed. Check the number of meters connected to the network. Max. number of devices to be connected is the one indicated by M-bus central unit version, considering for each one a specific loading unit (1.5 ma), but if devices with two specific loading units (3 ma) are connected, max. number is the half. Communication errors: Check contacts of interface, wiring of network and software setting. One or more devices are not read: Check baud rate and ID of the device. Check that bus tension is between 24 V and 42 V. Keyboard operations When central unit is not reading or communicating and no errors have been detected, data of each meter can be read through keyboard by typing its respective primary or secondary address (depending on what the operator set). In addition, by typing the apposite password (the pre-set one is: 1767) the access to main menu is possible; this one enables to configure M-bus central unit, to search M-bus devices connected to M-bus central unit and to set the reading interval. Technical specifications central unit functioning as either level adaptor or datalogger for data reading and storage of max. 120 meters connected to network for GE552Y008 and max. 250 meters connected to network for GE552Y010 (nominal current for each device equal to 1,5 ma). Control through keyboard on the frontal part of the device or through computer with serial direct connection; possibility to have remote control through modem connection. Possibility to read data of each M-bus device connected to the network or access to all functions available in the menu, that enables device configuration, M-bus connected devices research and setting of data reading interval. The latter operation can be manual in real time or automatic depending on set interval. Max. and min. communication Baud rate that can be set among: 300, 2400, 9600 baud. interfaces for PC connection and for Modem connection, 4 inlets for lines. 256 KB storage memory. Size (LxHxP) 214x240x94 mm. Product codes: GE552Y008 and GE552Y010. Additional information For additional information please check the Giacomini website at the following address: www.giacomini.com +39 0322 923 372 6 +39 0322 923 255 * consulenza.prodotti@giacomini.com This pamphlet is merely for information purposes. Giacomini S.p.A. retains the right to make modifications for technical or commercial reasons, without prior notice, to the items described in this pamphlet. The information described in this technical pamphlet does not exempt the user from following carefully the existing regulations and norms on good workmanship. Giacomini S.p.A. Via per Alzo 39, I-28017 San Maurizio d Opaglio (NO) Italy 2