ANNEX 4: LITERATURE: 33
2. METER FUNCTIONS 113
2.2. ADDITIONAL FUNCTIONS 117
2.2 ADDITIONAL FUNCTIONS
2.2.1 COMMUNICATION WITH THE METER
Meter shall have communication between the meter and different devices (hand terminals, communication modules, registers, data concentrators, etc.). Communication shall be
executed via interfaces given in the following table, with the usage of data model, application layer and identification structure according to DLMS/COSEM.
Block diagram of meter interfaces. Meter shall have the following interfaces:
Type Type Physical characteristics of
interface
Communication
protocol
Optical interface: IR port SRPS EN 62056‐21 DLMS/COSEM
Electrical interface № 1 RS‐485 RS‐485 DLMS/COSEM
*Optionally (subject to additional request of electricity distributor)
Electrical interface № 2 M‐BUS EN 13757‐2 EN 13575‐3
Electrical interface № 3
RS‐232 RS‐232 EN 13575‐4
or
Ethernet RJ‐45 Ethernet TCP/IP (DHCP)
*bidder can offer interfaces no.2 and 3, but he is not obliged
Meter shall have DLMS/COSEM certificate issued based on the verification with the latest version of testing software (at least version 2).
Electrical interface is galvanically insulated from the metering part of the meter.
Communication part of the meter is executed to enable simultaneous communication with the meter via all meter interfaces, without their mutual disturbance, especially without impact on the measuring part of the meter.
External communication is executed via special communication module, situated in the corresponding space (point 1.2.1).
All electrical connections of communication module with the meter is achieved under PLUG IN principle (connector to connector), with no wire connections, whereas the total consumption of the meter and communication module does not exceed the requirement from point 1.1.5. Communication module shall not logically depend from the meter, i.e. replacement of old and installation of new communication module is reduced to simple physical replacement, while software in the concentrator/AMM Centre performs logic replacement.
Communication module uses the protocol defined according to DLMS/COSEM. Electrical interface RS‐485 is two‐wire active and it is used for:
Connection with communication module for remote reading (GRPS modem, PLC modem, etc.)
Direct connection with laptop when necessary to access the meter/meter parameters directly
Possible connection of several meters to the bus in cases of grouped meter installation.
For the easier realisation of the connection of more meters on the bus in the event of group installation of the meters over the bicable active RS 485 interface, meter has additional connector which is realized:
via separate connector on the meter (auxiliary contacts) or
via separate connector on communication module for remote reading (GPRS modem, PLC modem, etc.), or
via appropriate module for the extension of external interfaces. In that case the indicated module shall always be delivered with the meter.
Electrical interface M‐BUS shall be realised upon the request of electricity distributor and it is used for:
Meter connection with other metering devices (water meter, gas meter, heat meter) – point 2.7.
Managing switch module for remote disconnection/connection of customers, in case that it is realized by the external switch module (item 1.2 of the Chapter Functional requests for switch module (bistable switch))
Electrical interface RS‐232, or Ethernet, shall be realised upon the request of electricity distributor and it is used for:
HAN (Home Area Network) connection of modem/module (depending on the manufacture, and upon the request of electricity distributor).
Optional electric interfaces (M‐BUS, RS‐232, Ethernet) may be realized via separate connector on the meter (auxiliary contacts) or
via separate connector on communication module for remote reading (GPRS modem, PLC modem, etc.), or
via appropriate module for the extension of external interfaces. In that case the indicated module shall always be delivered with the meter.
2.2.1.1 GPRS COMMUNICATION
At the request of Employer, the meter may be equipped with GPRS communication module which is connected to the meter via specific electrical interface, whereas the requests from items 1.1.8 (dimensions) and 1.2.1 (housing) are fulfilled. Characteristics of GPRS communication module are given in the Chapter Technical Characteristics and functional requests for GPRS modem items 1, 2.1 and 2.1.1.
2.2.1.2 PLC COMMUNICATION
At the request of Employer, the meter may be equipped with PLC communication module which may be, in accordance with the Employer’s request, installed as:
External PLC communication modem, which is connected to the meter via specific electrical interface. Characteristics of integrated PLC communication modem are given in the Chapter Technical Characteristics and functional requests for GPRS modem, items 1, 2 and 2.2.1.
Integrated PLC communication modem, which is installed inside the meter housing. Characteristics of integrated PLC communication modem are given in the Chapter Technical Characteristics and functional requests for PLC modem, items 1, 2 and 2.2.2.
In that case, electrical interface number 1 is not mandatory.
2.3 CONSUMPTION AND ELECTRICAL DEVICES MANAGEMENT
Meter has the possibility of consumption management, by means of a special switching module (bistable switch) executing remote disconnection/connection of customers and limiting of permitted maximum active power.
That function is realized at the request of electricity distributor.
In accordance with the Employer’s request, switching module may be realized as:
Integrated switching module (bistable switch). Characteristics of integrated switching module are given in the item 1.1 of the Chapter Functional requests for switching module (bistable switch).
External switching module (bistable switch). Characteristics of external switching module are given in the item 1.2 of the Chapter Functional requests for switching module (bistable switch).
If distributor chooses meter with external switching module, meter functions are not conditioned by connecting external switching module. Exceptions are only the options of consumption management‐ remote disconnection/connection of customers and limiting of permitted maximum power.